Telex
Operating Instructions
I/C
TELEX IN
HEADSET
AUDIO
CHANNEL
OUT
1
OUT
IN
TM
RadioCom
MIC
GAIN
1
RTS
2
AUTO
ON
I/C
A
1
B
2
BP
AUX
IN
OUT
EA
L C
2
VOL
TALK/
OM
T
K
OFF
ON
CODE SWITCH
AUX
BELT PACK
LOCAL
OFF
BTR-600C
SIDETONE
TALK
elex
T
RadioCom™
BTR-500/600C
TR-500/600C
Professional
Wireless
Intercom Set
R
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Table of Contents (Continued)
System Operation...............................................................................................................................21
Base Station Operation ..................................................................................................................21
Power .......................................................................................................................................21
Push-to-Talk/Lock-to-Talk Switch...........................................................................................21
Local Headset Volume .............................................................................................................21
Microphone Gain .....................................................................................................................21
Dual Listen Level.....................................................................................................................22
Intercom Level.........................................................................................................................22
Auxiliary Level........................................................................................................................22
Sidetone Level .........................................................................................................................22
Beltpack Operation ........................................................................................................................23
Power/Local Headset Volume..................................................................................................23
Battery Check...........................................................................................................................23
Push-to-Talk/Lock-to-Talk Switch...........................................................................................23
Microphone Gain .....................................................................................................................23
Sidetone Level .........................................................................................................................24
Example System Configurations....................................................................................................25
Single Base Station AudioCom (Telex) System ......................................................................25
Single Base Station RTS System .............................................................................................26
Six Base Station RTS System ..................................................................................................27
Eight Base Station Telex System .............................................................................................28
Single Beltpack to Single Beltpack System.............................................................................29
System Walk-Thru.............................................................................................................................30
Troubleshooting..................................................................................................................................31
Tech Tips.............................................................................................................................................32
Codes Settings and the BTR-600C ................................................................................................32
Frequency Interaction ....................................................................................................................32
Microphone Gain Adjustment........................................................................................................33
Battery Information...........................................................................................................................33
Intercom System Specifications........................................................................................................33
Accessories..........................................................................................................................................34
Customer Service Information .........................................................................................................35
FCC Information ...............................................................................................................................36
-ii-
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Introduction
The Radiocom BTR series has been designed for re-
General Description
liable, efficient operation. Operating in the 520 to
760 MHz range, the units operate reliable at dis-
tances of 1,000 feet. With available antenna systems
from Telex, the effective operating range can be ex-
tended. The high efficiency beltpacks provide 12
hours of uninterrupted operation using standard al-
kaline batteries.
The Telex Radiocom BTR-500 and BTR-600C
UHF Wireless intercom systems offer the ultimate
in reliable, high performance, high fidelity full du-
plex communications.
The BTR-500 series includes the BTR-500 fre-
quency agile base station, working with the TR-500
transceiver beltpack. The BTR-500 base station pro-
vides full duplex communications with a single
beltpack. Sixteen BTR-500s, or more, may be oper-
ated simultaneously. Also a single BTR-500 base
station can accommodate an unlimited number of
beltpacks operating in “Push-to-Transmit” mode.
System Features
·
Compatible with Audiocom (Telex), RTS TW, RTS
Matrix, Clear-Com (with external interface box),
and other wired intercom types.
·
Intercom loop thru jacks for connecting multiple
units.
The BTR-600C series has all the features of the
BTR-500 with the addition of digital modulation
and encryption for secure communications. Base
station and beltpacks can choose from over 65,000
user selectable security codes out of over 16 million
possible codes by means of four cipher code
switches on the units. Sixteen BTR-600C, or more,
may be operated simultaneously, permitting 16, or
more, discrete full duplex radio channels.
·
·
Full Duplex (simultaneous talk and listen) operation.
Beltpack TR unit contained in a weather and shock
resistant die cast magnesium case.
·
·
Digitally encrypted RF (Radio Frequency) link for
secure communication on the 600C version.
Flexible power requirements. The base unit can be
powered by any 12 to 15 Volt, AC or DC, 400 mA
power source. An external AC wall supply is sup-
plied with the unit.
The BTR systems incorporate auto-switching 2
channel operation, permitting the beltpack operator
to choose between 2 separate audio channels of
communications, with the base station tracking the
beltpack selection. Auto-switching allows the user
the flexibility to create a party-line and a private
line within the same beltpack.
·
Two transmit and two receive RF channels to help
avoid radio interference.
·
·
Base stations are table or rack mountable.
Audio channel switch on the beltpack unit enables it
to remotely control the intercom channel on the base
unit.
The BTR-500 and BTR-600C systems are perfectly
suited for stand-alone operation and also can inter-
face with Audiocom® (Telex), RTS® TW, as well
as RTS Matrix systems and other 4 wire communi-
cations systems. Clear-Com® intercom system may
also be interfaced to a BTR-500 and BTR-600C
systems through the use of a Telex to Clear-Com In-
terface box, see “Accesories” for more information.
In addition to the external intercom systems inter-
faces listed above, the base stations provide connec-
tions for auxiliary balanced audio input and output.
·
·
Two channels of audio.
Beltpack batteries last up to 12 hours when using
standard AA alkaline batteries.
·
Audio out jack for P.A. systems or other external au-
dio systems.
RTS® and Audiocom® are registered trademarks of Telex Communications, Inc.
Clear-Com® is a registered trademark of Clear-Com Intercom Systems, Inc.
-1-
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Base Station Transceiver
Controls and Connections
4
9
11 14
10
1
2
3
15
17 18
16
HEADSET
I/C
OUT TELEX
AUDIO
CHANNEL
IN
OUT
IN
TM
MIC
GAIN
RadioCom
1
AUTO
2
ON
I/C
IN
A
B
2
1
BP
EA
L C
T K
AUX
OFF
OUT
VOL
TALK/
OM
ON
CODE SWITCH
AUX
BELT PACK
LOCAL
OFF
BTR-600C
SIDETONE
TALK
13
5 7
12
Figure 1
Front Panel Controls and Connections
19
8 6
11.
Intercom Light - Flashes red when input level is too high.
See #3 for adjustment.
1. Power Switch - Illuminates when on.
2. Beltpack Light - Illuminates when a beltpack is transmit-
12. Auxiliary Switch - Turns the auxiliary input on and off.
ting to base station.
13. Auxiliary Light - Illuminates green when switch #12 is
on. Flashes red when input level is too high. See #5 for ad-
justment.
3. Intercom In Level Control - Adjust for optimum level.
Intercom light #11 should just flash red on loudest
speech.
14. Code Switch (BTR-600C Only) - Allows user to select
cipher code (over 65,000 available). Any combination of
letters and/or numbers may be selected except 0000. Data
is unencrypted when the setting is 0000. The code switch
settings on the BTR-600C and TR-600C must match ex-
actly.
4. Intercom Out Level Control - Adjusts output to match
input level of wired intercoms.
5. Auxiliary In Level Control - Adjust for optimum level.
Auxiliary light #13 should just flicker from green to red
on loudest sounds.
6. Auxiliary Out Level Control - Adjusts output to match
15. Volume, Headset - Controls volume on headset plugged
input level of auxiliary equipment.
into #18
7. Sidetone Local Control - Adjusts level of voice feedback
16. Talk/Overmodulation Light - Illuminates green when
talk switch #19 is on. Flashes red when headset micro-
phone is over modulated - See #17 for adjustment.
to earphone when a headset is plugged into jack #18.
8. Sidetone Remote Control - Controls sidetone level in the
beltpack.
17. Microphone Gain Control - Adjust so that light #16 just
flickers from green to red on the loudest speech.
9. Audio Channel Switch And Lights -
A. “I/C” switch on rear panel set to Telex - Selects either
“I/C 1 or 2" jack (and corresponding pins on ”I/C Loop
Thru"). In “Auto” position; allows selection of chan-
nels 1 or 2 from the beltpack.
18. Headset Connector - Standard “XLR” type. Plug for
Telex units and jack for RTS units. Wired as follows:
Telex Units
(4) Headphone
(1) Microphone
Shield (-)
B. “I/C” switch on rear panel set to RTS - Selects RTS
channel 1 or 2 on both I/C jacks (and corresponding
pins on “IC Loop Thru”). In “Auto" position; allows
selection of channels 1 or 2 from the beltpack.
Low (-)
(3) Headphone
(2) Microphone
High (+)
Audio (+)
10. Intercom Switch - See settings below.
A. “I/C” switch on rear panel set to “Telex”
1. “Telex Out” Setting - Intercom is disconnected
from all “I/C” jacks on rear panel.
RTS Units
(4) Headphone
Low (-)
(1) Microphone
Shield (-)
2. “Telex In” Setting - Intercom is connected to “I/C
Loop Thru” and “I/C 1 or 2" jacks. Channel 1 or 2
is selected by switch #9 or the channel switch on
the beltpack.
(3) Headphone
High (+)
(2) Microphone
Audio (+)
B. “I/C” switch on rear panel set to “RTS” - Switch has no
effect. All I/C jacks on rear panel are active on either
setting.
Figure 2 Headset Wiring
19. Talk Switch - Press-to-talk, release to disable. Press and
release quickly to stay on.
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Base Station
Controls and Connections - Rear Panel
3
15
1
TRANSMIT
RECEIVE
LOOP
THRU
BTR-600C
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
CH2
CH2
+
2
TELEX
RTS
O
A
B
A
B
O
N
F
F
POWER
12-15V
AC/DC
I/C 1
I/C 2
I/C
RECEIVE
CHANNEL
TRANSMIT
CHANNEL
AUX
+
1
LEVEL
CONT.
4
5
6 7
8
10
11
13
14
2
9
12
Figure 3
Controls and Connections - Rear Panel - BTR-600C
1. Transmit Antenna Jack - Color band on antenna must
1
5
match color dot on base station. Female “TNC” Connec-
tor.
9
6
2. Transmit Channel Switch - Changes frequency of
beltpack (shown on Serial No. Tag). Must match receive
channel on beltpack.
1
5
9
6
Ground
3. Audio Out - “RCA” type jack
PIN
1
2
3
GROUND
AUDIO
+ AUDIO
provides a high impedance out-
put for an audio amplifier.
Audio Out
2
1
2
1
SWITCH #4
3
3
SET TO "TELEX"
I/C 2
(CHANNEL 2)
I/C 1
(CHANNEL 1)
4. I/C Switch - Set for Telex or RTS type intercom systems.
See Figures 4 and 5.
Figure 4
5. Transmit Mode Switch -
Intercom 1 and 2 Jacks - Switch set to Telex
A. “Remote” - The unit transmits only when the beltpack
is transmitting.
1
5
B. “Off” - The unit does not transmit.
C. “Continuous” - The transmitter is on continuously.
(Recommended Setting)
9
6
1
5
A.
B.
C.
D.
CH1+2=OFF
CH2+1=OFF
CH1+2=ON
CH2+1=OFF
CH1+2=OFF
CH2+1=ON
CH1+2=ON
CH2+1=ON
Both audio channels are iso-
lated from each other.
9
6
Audio channel 2 is mixed into
channel 1.
PIN
1
2
3
COMMON
CHANNEL 1
CHANNEL 2
Audio channel 1 is mixed into
channel 2.
2
1
1
2
3
3
SWITCH #4
SET TO "RTS"
Both audio channels are
mixed into each other.
IC/2
IC/1
Figure 5
Intercom 1 and 2 Jacks - Switch set to RTS
6. Dual Listen Switches
7. Dual Listen Level Control-Adjusts level of audio mix.
B. I/C Switch (#4) set to RTS - “I/C 1" and ”I/C 2" are
connected in parallel (including matching pins on jacks
9 and 10). Channels 1 and 2 are selected by the Audio
Channel switch on the front panel or the channel
switch on the base station.
8. & 11. Intercom 1 and 2 Jacks -
A. I/C Switch (#4) set to Telex - “I/C 1" or ”I/C 2" (and
matching pins on jacks 9 and 10) are selected by the
Audio Channel switch on the front panel or the Chan-
nel switch on the base station.
If neither channel 1 or 2 are connected to other inter-
coms, plug the RTS dummy load into the “I/C 1 or 2"
jack. Do not use the dummy load if the unit is con-
nected to an RTS intercom system.
If one or both intercom lines are not used, plug the
Telex dummy load(s) into the appropriate unused
jack(s).
-3-
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9. & 10. Loop Thru I/C - 9 pin D-sub jack. Wired as shown.
13. Power Jack - 12-15 VDC, 400mA minimum or 12-15
VAC rms, 400mA rms minimum. Accepts 5.5 mm x 2.1
mm plug.
11. See #8.
12. Auxiliary Jack - 6 pin RJ-11 telephone type jack. Com-
14. Receive Channel Switch - Changes frequency of receiver
(shown on Serial No. Tag). Must match transmit channel
on beltpack.
patible with “RTS Matrix” type intercoms.
PIN 6 5 4 3 2 1
13. Receive Antenna Jack - Color band on antenna must
match color dot on base station. Female “TNC” Connec-
tor.
NC
NC
AUDIO IN -
AUDIO IN +
AUDIO OUT +
AUDIO OUT -
Figure 6
Auxiliary Jack
BTR-500/600C
Specifications
RF Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mW maximum, 25mW typical
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4°F to 130°F (-20°C to 55°C)
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.25"W x 1.75"H x 11.25"D (21cm x 4.5cm x25.6cm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 lbs. (1.8kg)
Modulation Type
BTR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NFSK
BTR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM
Deviation
BTR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Complies with FCC 74.861e6
BTR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40 KHz
Frequency Response
BTR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-4500 Hz
BTR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-8000 Hz
RF Frequency Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005% crystal controlled
Modulation Limiter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal Compressor
Microphone input sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0-25 mV
Radiated Harmonic and Spurious. . . . . . . . . . . . . . . . . . . . . . . . . Meets or exceeds FCC specifications
Typically -45 dBc or better
RF Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520 to 608 and 614 to 760 MHz
Receiver sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Less than 0.5 uV for 12 dB SINAD.
I.F. Bandwidth
BTR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 KHz at -3dB
BTR-500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 KHz at -3dB
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Conversion Superhet, 10.7 MHz I.F.
Image Rejection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB or better
Audio Output, Headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 mW into 600 Ohms
Squelch
BTR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal, 3.0 mV
BTR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal, 1.5 mV
FCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmit, Part 74
Receive, Verification, Part 15
FCC ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5DM503 (BTR-600C), B5DM505 (BTR-500)
-4-
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Beltpack
Controls and Connections
1
6
2
3
5
O
N
F
F
O
O . M .
B A
13
12
T /
1
C H A N N E L
4
2
7
11
x
e
l
e
T
8
9
10
Figure 7
Controls and Connections
10. Headset Connector - Standard “XLR” type. Plug for Telex
1. Volume Control and Power Switch - Turns power on
units and jack for RTS units. Wired as shown.
and off and controls headset volume.
2. Battery/Overmodulation Light - Flashes once when unit
is turned on if battery is good. If light stays on, battery is
low. If light does not flash, battery is dead.
(4) Headphone
(1) Microphone
Low (-)
Shield (-)
Flickering red light when talking means microphone gain
is too high and speech will sound distorted. Adjust Mic
Gain control #7 so that the light barely flashes on the loud-
est speech.
(3) Headphone
High (+)
(2) Microphone
Audio (+)
Telex Units
3. Talk Switch - Press to talk, release to disable. Press and
release quickly to stay on continuously.
(1) MICROPHONE
SHEILD (-)
4. Talk Light - Illuminates when Talk function is on.
(2) MICROPHONE
AUDIO (+)
5. Audio Channel Switch - The Audio Channel Switch en-
ables the beltpack user to switch between wired intercom
channels 1 and 2 on the base station.
RTS Units
(4) HEADPHONE
LOW (-)
(3) HEADPHONE
HIGH (+)
6. Side Tone Control - (Only installed in special beltpack to
beltpack direct communications units). Adjusts level of
voice feedback to earphone for a headset that is plugged
into the jack #10. The “Remote Sidetone” on the base sta-
tion controls the beltpack sidetone in standard units.
Figure 8
Headset Jack Wiring
11. Push-to-Talk/Push-to-Transmit - When the switch is set
to “Push-to-Talk”, the transmitter in the beltpack is always
on, but no audio signal is sent unless the Talk Switch #3 is
activated. The “Push-to-Talk” switch setting is the recom-
mended position.
7. Microphone Gain Control - Adjust so the light #2 barely
flashes on the loudest speech.
8. Code Switch (TR-600C Only) - Allows the user to select
a cipher code (over 65,000 available). Any combination of
letters and/or numbers may be selected except 0000. Data
is unencypted when the setting is 0000. The code switch
settings on the TR-600C and BTR-600C must match ex-
actly.
When the switch is set to “Push-to-Transmit", the trans-
mitter is turned on when the Talk Switch is activated and
turned off when the talk switch is deactivated.
12. Receive Channel - Changes the frequency of the receiver.
It must match the Transmit Channel of the base station.
9. Battery Latch - Press down to release the battery pack.
Pack slides off in opposite direction.
13. Transmit Channel - Changes frequency of the transmit-
ter. It must match Receive Channel of the base station.
-5-
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Beltpack
Specifications
RF Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mW typical
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4°F to 130°F (-20°C to 55°C)
Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4"W x 5 7/8"H x 1 5/8"D (120mm x 149mm x 41mm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 lb. 6 oz. (625g) with batteries
Modulation Type
TR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NFSK
TR-500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM
Deviation
TR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Complies with FCC 74.861e6
TR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40 KHz
Frequency Response
TR-600C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-4500 Hz
TR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300-8000 Hz
RF Frequency Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005% crystal controlled
Modulation Limiter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal Compressor
Microphone input sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0-25 mV
Radiated Harmonic and Spurious. . . . . . . . . . . . . . . . . . . . . . . . . Meets or exceeds FCC specifications
Typically -45 dBC or better
RF Frequency Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520 to 608 MHz and 614 to 760 MHz
Receiver sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Less than 0.5 uV for 12 dB SINAD.
I.F. Bandwidth
TR-600C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 KHz at -3dB
TR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 KHz at -3dB
Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Conversion Superhet, 10.7 MHz I.F.
Image Rejection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB or better
Audio Output, Headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 mW into 600 Ohms
Squelch
TR-600 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal, 3.0 µV
TR-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal, 1.5 µV
FCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmit, Part 74
Receive, Verification, Part 15
FCC ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5DM506 (TR-500), B5DM504 (TR-600C)
-6-
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Initial Equipment Set-Up
Unpacking
Contact the shipper or your dealer immediately if
anything is damaged or missing. Fill out the regis-
tration card and return it to Telex to properly regis-
ter your unit.
Unpack your RadioCom System. A system package
should contain the following Items:
Quantity
Descripton
1
1
1
2
1
2
1
1
2
4
BTR-500 or BTR-600C Base Station
TR-500 or TR-600C Beltpack
Wall Power Supply
Antennas (one Transmit and one Receive)
Interconnect Cable (9 pin to 9 pin)
Dummy Loads (3 pin XLR male)
Operating Instructions
Warranty and Registration Card
Plastic Screwdrivers
Rubber Feet
Antenna Information
Antenna Connection
The base station is supplied with two (2) antennas.
One 1/2-wave antenna for Transmit and one
1/2-wave for Receive. The antennas have TNC male
connectors.
The frequency range of the antennas should match
the receiver and transmitter of the base station.
Match the color code on the antenna with the color
code on the base station.
Attach the receive 1/2-wave antenna to the antenna
input receptacle labeled “Receive” on the right side
of the rear panel. The antenna should be vertically
aligned.
Figure 9
Attaching Receive 1/2-Wave Antenna
-7-
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Attach the transmit 1/2-wave antenna to the antenna
input receptacle labeled “Transmit” on the left side
of the rear panel. The antenna should be vertically
aligned.
The antennas can be remoted for better signal path.
A Telex coax assembly and/or a signal splitter/
combiner with remote antennas may be required.
See “Accessory” section for ordering information.
NOTE: If your base station is to be located in a
shielded rack mount enclosure or other poor RF lo-
cation, you must remote the 1/2-wave antennas with
coax assemblies or use a splitter/combiner (SC-600)
with special broad band antennas. See “Example
System Configurations” section for a multiple unit
system using a SC600 and broad band antennas.
Antenna Placement
Proper antenna placement probably has the most ef-
fect on your TELEX Wireless Intercom System’s
overall performance. The following suggestions will
result in optimum performance.
Proper placement of the beltpack can be critical.
The antennas should be in the open. Bending the an-
tennas up and placing the beltpack in a pocket, etc.,
will reduce system distance.
Figure 10
Attaching Transmit 1/2-Wave Antenna
Antenna Polarization
The Telex Wireless Intercom System is “Vertically
Polarized”. This means both the transmitting and re-
ceiving antennas should operate in the vertical posi-
tion.
It is suggested that the unit be worn on the belt or
pocket with both antenna’s hung vertically for best
operating range and performance.
I/C
HEADSET
AUDIO
CHANNEL
1
OUT TELEX IN
OUT
OUT
IN
R
MIC
GAIN
Radio Com
ON
I/C
IN
AUTO
2
A
B
2
1
B
E
L
T
P
A
C
K
AUX
VOL
T
ALK/
OM
OFF
ON
CODE SWITCH
AUX
LOCAL
BELT PACK
OFF
BTR-600C
x
ele
T
SIDETONE
TALK
T
elex
ANTENNAS MUST BE VERTICAL
Figure 11
Vertically Polarized Antenna
Distance between Antennas
The distance between the base station’s receive and
transmit antennas is not adjustable when the anten-
nas are connected directly on the back of the unit.
Figure 12
Proper Dressing of the Antennas
-8-
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Keep the distance between the BTR and the TR as
short as possible. The greater the distance, the
weaker the signal. Make sure the “signal paths” be-
tween the BTR and TR are unobstructed. You
should be able to visibly locate the antennas at all
times for best performance.
Attempting to operate the wireless intercom system
through or around walls, ceilings, metal objects, etc.
will reduce system range and performance.
T
elex
T
elex
700 FEET
I/C
HEADSET
AUDIO
CHANNEL
1
OUT TELEX IN
IN
OUT
OUT
R
Radio Com
MIC
GAIN
ON
I/C
IN
AUTO
2
A
1
B
2
B
E
L
T
P
A
C
K
AUX
VOL
T
ALK/
OM
OFF
ON
CODE SWITCH
AUX
LOCAL
BELT
PACK
OFF
BTR-600C
SIDETONE
TALK
Telex
100 FEET
I/C
HEADSET
AUDIO
CHANNEL
1
OUT TELEX IN
OUT
OUT
IN
R
Radio Com
MIC
GAIN
ON
I/C
IN
AUTO
2
A
B
2
1
B
E
L
T
P
A
C
K
AUX
VOL
T
ALK/
OM
OFF
ON
CODE SWITCH
AUX
LOCAL
BELT PACK
OFF
BTR-600C
SIDETONE
TALK
Figure 13
Distance Between base station and
beltpack
Figure 15
Operating System Near Obstructions
DO NOT - mount the base station 1/2-wave anten-
nas on, or next to metal, such as beams, walls with
metal studs, equipment racks, etc. This also applies
to the antennas when assembled directly to the Base
Station. This will “detune” the antennas which can
result in noise or loss of RF signal at the Base Sta-
tion, See Figure 15.
T
elex
I/C
AUDIO
CHANNEL
1
HEADSET
OUT TELEX IN
OUT
OUT
IN
R
MIC
GAIN
Radio Com
ON
AUTO
2
I/C
IN
A
1
B
2
BP
AUX
OFF
E
L
T
A
C
K
VOL
TALK/
OM
ON
CODE SWITCH
AUX
LOCAL
BELT PACK
OFF
BTR-600C
SIDETONE
TALK
T
elex
Figure 14
Keeping Site Clear to Antenna
-9-
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Telex
Telex
2. Placing the BTR on top of a
shelf or equipment rack un-
obstructed without remoting
the antennas is OK.
3. Placing BTRs in a shelf or
equipment rack with the an-
tennas mounted on the back
of the BTR or the side of the
rack is bad.
1. Placing BTRs in a shelf or
equipment rack and using re-
mote antennas is OK.
A
1
B
2
TALK
Telex
Telex
Telex
A
1
B
2
A
1
B
2
A
1
B
2
T
L
T
A
1
B
2
A
1
B
2
A
1
B
2
A
1
B
2
T
L
T
T
L
T
R
SC-600
R
SC-600
UHF ANTENNA SPLITTER/COMBINER
T
elex
UHF ANTENNA SPLITTER/COMBINER
T
elex
#2
#1
#3
Figure 16
Antenna Placement
Improving Reception and Increasing Range
Keeping the distance from the base station and
beltpack as short, and unobstructed as possible will
produce the most reliable performance.
The base station is supplied with two antennas. This
should provide satisfactory system performance in
most applications. System range can be enhanced
by remoting the 1/2-wave antennas.
If a multiple base station system is being config-
ured, it is best to use a splitter/combiner (SC-600)
with remote antennas for the best performance.
-10-
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Base Station Set-Up
Location
Locate the base station on a level surface with the
rear of the unit facing you. See “Antenna Informa-
tion” section for more information on choosing a lo-
cation.
Rack Mounting
Two kits are available for rack mounting the base
station. The first kit rack mounts a single base sta-
tion in a 19" rack. The second kit rack mounts two
base stations, side by side, in a 19" rack. Instruc-
tions are included in the rack mount kits. Refer to
the “Accessories” section for rack mount part num-
bers.
Figure 18
Connecting Headset to the Base Station
RF Transmit/Receive Channel Switches
Allows the user to select which of the two RF chan-
nels the unit is on. The transmit channel selected,
either “A” or “B”, is the frequency of the base sta-
tion’s transmitter.
The receiver channel selected, either “A” or “B”, is
the frequency of the base station’s receiver. The fre-
quencies are listed on the bottom of the base station.
The base station’s transmit frequency must match
the beltpack’s receive frequency. The base station’s
receiver must match the beltpack’s transmit fre-
quency. Typically both base station switches are set
to “A” or both to “B” and the beltpacks are set to
the same.
Figure 17
Attaching Brackets for Rack Mounting
A
B
A
B
Local Headset Connection
Insert the headset into the 4 pin XLR connector on
the front panel. See the headset connection diagram
(Figure 2) if other than a Telex Headset is used.
TRANSMIT
CHANNEL
RECEIVE
CHANNEL
Figure 19
Receive and Transmit Switches
-11-
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RF Transmit Mode Switch
Dual Listen Switches
Allows the operator to select three different types of
transmitting modes; continuous transmit, transmitter
off, or remote transmitter. For most operations,
place the transmitter switch in the “CONT” position
(Continuous mode).
These two switches allow the mixing of the inter-
com channels. The mixing of audio channels occurs
locally, only at the base station and its beltpack. The
switches do not affect the audio in the intercom
lines into the base station.
In the Continuous mode the RF transmitter will be
on at all times regardless of whether the portables
are on or not.
DUAL
LISTEN
CH1 + 2
In the Remote mode, the only time the base can
transmit is when a portable unit is turned on.
O
N
CH2 + 1
LEVEL
In the Off mode the base station will not transmit to
the remote belt-packs. This mode might be used if
the base is to be an intercom system monitor station
only.
Figure 22
Dual Listen Switches
XMIT
MODE
REMOTE
CH1 + 2 Switch = OFF
CH2 + 1 Switch = OFF
O
F
F
The two intercom audios are isolated. Audio chan-
nel one cannot be heard on channel two and vise
versa.
CONT.
CH1 + 2 Switch = ON
CH2 + 1 Switch = OFF
Figure 20
Transmit Switch
Audio channel two will be mixed into audio channel
one. The volume of the mix of channel two as heard
in audio channel one may be controlled by the level
control.
Intercom Type Switch
Set for Telex or RTS Type intercom systems.
CH1 + 2 Switch = OFF
CH2 + 1 Switch = ON
I/C
Audio channel one will be mixed into audio channel
two. The volume of the mix of channel one as heard
in audio channel two may be controlled by the level
control.
RTS
TELEX
CH1 + 2 Switch = ON
CH2 + 1 Switch = ON
Figure 21
Intercom Select Switch
Both audio channels are mixed into one another.
The level of the other channel may be heard at the
volume set by the level control.
-12-
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Audio Channel Switch
Intercom Type Set to Telex
AUX
Selects either “IC 1 or 2" (and corresponding pins
on ”IC Loop-thru"). In “Auto” position the switch
allows selection of channels 1 or 2 from the
beltpack.
ON
OFF
Figure 25
Auxiliary Switch
AUDIO
CHANNEL
1
Auxiliary to I/C Switch (Program Audio)
AUTO
2
This switch is located inside the base station. Its
function is to provide a user with the ability to input
a third channel of listen only audio via the “AUX”
jack. This third channel of audio, usually called
“Program Audio” is always heard regardless of
which intercom channel the user is on. The program
audio is heard only on the local base station and its
beltpack.
Figure 23
Audio Channel Switch
Intercom Type Set to RTS
Selects RTS channel 1 or 2 on both I/C jacks (and
corresponding Pins on “I/C Loop-thru”). In “Auto”
position the switch allows selection of channels 1 or
2 from the beltpack.
To gain access to the switch the base station’s top
cover must be taken off. Unscrew the six screws on
the cover and lift off. The switch can be found be-
tween the two shielded compartments (Figure 27).
The switch is labeled “Aux to IC” and should nor-
mally be left in the “ON” position. Unless using the
“AUX” jack for program audio input. Switch to the
“OFF” position if inputing program audio. The
switch now disables auxilary input audio from be-
ing placed on the intercom system but can be heard
locally.
Telex IN/OUT Switch
Intercom Type Set to Telex
Telex = OUT
Intercom is disconnected from the I/C jacks and
corresponding “I/C Loop-thru” connector pins.
Telex = IN
Intercom is connected to I/C jacks and correspond-
ing “I/C Loop-thru" connector pins.
The auxiliary ON/OFF switch must be set to “ON”
to enable input audio through the auxiliary port. The
level of the program audio as heard in the back-
ground of the audio channel currently switch to is
controlled via the “AUX IN" level control on the
front panel.
Intercom Type Set to RTS
Setting of switch has no effect. All I/C jacks and
corresponding “I/C Loop-thru” connector pins are
active.
I/C
TELEX
Code Switch (BTR-600C Only)
OUT
IN
Allows the operator to select over 65,000 cipher
codes. The beltpack’s code must match the base sta-
tion’s code for audio recovery. Any combination of
letters and/or numbers may be selected except 0000.
The data is unencrypted when the setting is 0000.
Figure 24
Telex In/Out Switch
Auxiliary Switch
A
F
2
3
Turns the “AUX” jack input audio on or off.
The audio out is always sent to the “Aux” jack and
is unaffected by the switch position.
Figure 26
Code Switch
-13-
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Figure 27
Auxiliary to I/C Switch
TRANSMIT
TRANSMIT
RECEIVE
RECEIVE
LOOP
THRU
BTR-500
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
PUSH
PUSH
AUDIO
OUT
AUDIO
OUT
ANT.
ANT.
ANT.
ANT.
DUAL
LISTEN
DUAL
LISTEN
XMIT
MODE
REMOTE
XMIT
MODE
REMOTE
I
/C
I
/C
TELEX
RTS
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
O
A
B
O
F
F
A
B
A
A
O
N
O
N
F
F
B
POWER
12-15V
AC/DC
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
LEVEL
LEVEL
CONT.
CONT.
XLR INTERCOM
CABLE
INTERCONNECT
CABLE
(SUPPLIED)
ONLY ONE CABLE
NEEDED FOR RTS.
BOTH ARE REQUIRED
FOR 2 CHANNELS OF
AUDIOCOM (TELEX)
TRANSMIT
TRANSMIT
RECEIVE
RECEIVE
LOOP
THRU
BTR-500
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
PUSH
PUSH
AUDIO
OUT
AUDIO
OUT
ANT.
ANT.
ANT.
ANT.
DUAL
LISTEN
DUAL
LISTEN
XMIT
MODE
REMOTE
XMIT
MODE
REMOTE
I
/C
I
/C
TELEX
RTS
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
O
A
B
O
F
F
A
B
A
A
O
N
O
N
F
F
B
POWER
12-15V
AC/DC
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
LEVEL
LEVEL
CONT
.
CONT
.
Figure 28
Connecting Base Stations Together
NOTE: It is not recommended to interface an inter-
com system thru the “Aux” jack while at the same
time having a different intercom system connected
to the XLR or D-Subs.
Interconnection to a Hard-Wired Intercom
System
The Radiocom wireless system can be integrated
into Audiocom (Telex) intercom systems and most
existing wired intercom systems including RTS and
Clear-Com.
It is recommended that Clear-Com intercom sys-
tems be interfaced to the base station through the
use of CCB-1 Adapters. These adapters convert
Clear-Com intercom signals to Telex intercom sig-
nals and vise versa. See “Accessories” for more in-
formation.
Connect the intercom cable to the back of the base
station. The intercom system may be connected to
the base station via the XLR, D-Sub, or Aux con-
nector in the rear of the unit. Audiocom, RTS and
Clear-Com intercom systems use either the XLR or
D-Sub connector. RTS Matrix intercom systems
typically use the Aux connector. Example configu-
rations of the two most popular intercom systems
are shown in Figures 29 and 30.
-14-
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INTERCOM
POWER SUPPLY
(PS-2000L)
TELEX
R
100-240 VAC 60/50 HZ
CHN
1
CHN
WIRING 1.5A 24 VDC
2
MADE IN USA
CLASS
2
INTERCOM USER STATION
(US-2000A)
TELEX COMMUNICATIONS, INC. MADE IN USA
PUSH
SPEAKERS
PUSH
PROGRAM
INPUTS
1
2
P.A.
EXP
OUT
LINE LEVEL
VRMS
VOL
PGM
VOL
2
1
1
PGM
CHN
1
CHN
2
12-15 VDC
AUDIO CH 1
AUDIO CH 2
CABLE
"Y"
ONE CH BELTPACK
(BP-1000)
HEADSET
LINES
HEADSET
LINES
HEADSET
LINES
TWO CH BELTPACK
(BP-2000)
TWO CH BELTPACK
(BP-2000)
HEADSET
LINES
ONE CH BELTPACK
(BP-1000)
AUDIO CH 1
ONE CH BELTPACK
(BP-1000)
HEADSET
LINES
AUDIO CH 2
TRIT
RE
LOOP
THRU
BTR-500
TRIT
R
TRMIT
LOOP
THRU
BTR-500
RE
LOOP
THRU
BTR-500
PUSH
TRT
REE
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
ANT
.
ANT.
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
AUDIO
OUT
AUDIO
OUT
ANT
.
ANT.
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
ANT
.
ANT.
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
CH2
CH2
+
2
XMIT
MODE
REMOTE
TELEX
RTS
I
/C
TELEX
RTS
CH2
CH2
+
2
I
/C
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
F
A
B
CH2
CH2
+
2
O
N
TELEX
RTS
A
B
O
F
F
A
B
A
B
O
A
B
O
N
O
N
POWER
12-15V
AC/DC
O
A
B
F
A
B
O
N
F
POWER
12-15V
AC/DC
F
I/C
2
POWER
12-15V
AC/DC
TRANSMIT
CHANNEL
I/C
1
I/C
AUX
RECEIVE
CHANNEL
+
1
F
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
CONT.
LEVEL
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CONT.
LEVEL
I/C
1
I/C
I/C
2
CONT.
LEVEL
CHANNEL
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
CONT.
LEVEL
BTR-600
BTR-600
BTR-600
BTR-600
INTERCONNECT CABLES
Telex
Telex
Figure 29
Example Interface to an Audiocom (Telex) Intercom System
-15-
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INTERCOM
POWER SUPPLY
(PS15)
MODEL PS15
POWER SUPPLY
O/N 9000678600
RTS SYSTEMS, BURBANK CALIFORNIA MADE IN U.S.A.
OUTPUTS
J1, J2 CONNECT TO
TW INTERCOM SYSTEM COMPONENTS
J1
J2
REFER TO OPERATION MANUAL
FUSE
0.5A S8/120 VAC
J3
IMPEDANCE
SELECT
TIP-CH1
RING-CH2
SLEEVE-COM
AUDIO CH 1 AND 2
RTS
DISTRIBUTION PANEL
(TW5W)
NORM
200
DUAL
400
CAUTION
AUDIO
COUPLING
CM1-CM2
CHN
1
CHN
1
FOR CONTINUED PROTECTION AGAINST FIRE
REPLACE ONLY WITH SAME TYPE FUSE.
AUDIO CH 1 AND 2
BTR-500
TRIT
RE
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
TELEX
RTS
CH2
CH2
+
2
A
O
A
B
O
N
F
F
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
CONT.
LEVEL
TWO CH BELTPACK
(BP-350)
BTR-500
HEADSET
LINE
TRIT
R
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
I
/C
REMOTE
TELEX
RTS
CH2
CH2
+
2
A
O
A
B
O
N
F
F
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
CONT.
LEVEL
HEADSET
LINE
TWO CH BELTPACK
(BP-350)
TRT
R
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
ONE CH BELTPACK
(BP-318)
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
TELEX
RTS
CH2
CH2
+
2
A
O
A
B
O
N
F
F
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CONT.
LEVEL
CHANNEL
BTR-500
HEADSET
LINE
TRT
REE
LOOP
THRU
BTR-500
TWO CH BELTPACK
(BP-350)
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
TELEX
RTS
CH2
CH2
+
2
A
O
A
B
O
N
HEADSET
LINE
F
F
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CONT.
LEVEL
CHANNEL
TWO CH BELTPACK
(BP-350)
BTR-500
HEADSET
LINE
Telex
Figure 30
Example Interface to an RTS Intercom System
-16-
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Auxiliary Audio Connection
Dummy Load
The 6 pin telephone jack (RJ-11) may be used to
supply audio into and out of the base station. RTS
Matrix type intercoms may be interfaced to the base
station through this jack.
In the case where a wired intercom will not be used
with the base station or only one of the audio chan-
nels are connected to the unit, it is important that
the dummy load(s) (supplied) be installed.
Since audio is not “Channelized” through this jack,
the audio channel switch has no effect on the audio
passed through the jack. The audio will be heard on
both channels 1 and 2 equally, audio generated by
the BTR on channels 1 or 2 will be sent to the Aux-
iliary Jack.
I/C Switch = Set for Telex
Telex dummy loads should be plugged into both
XLR ports if a wired Telex intercom system is not
being used. A single Telex dummy load should be
plugged into the unused channel’s XLR port if only
one channel is connected to an intercom system.
PIN 6 5 4 3 2 1
I/C Switch = Set for RTS
RTS dummy load should be plugged into one of the
XLR ports if an RTS intercom system is not being
used.
NC
NC
NOTE: If the dummy load is not placed properly,
an annoying squeal may result that may cause dam-
age to the ears.
AUDIO IN -
AUDIO IN +
AUDIO OUT +
AUDIO OUT -
Figure 31
Auxiliary Jack
Power Connection
Insure the Power ON/OFF Switch on the front of
the base station is in the “OFF” position. Connect
the supplied AC power supply cord to the receiver
at the socket labeled “POWER”. Connect the power
supply unit to an AC outlet supplying 105 to 125
VAC, 60 Hz.
POWER
12-15V
AC/DC
TO
AC
OUTLET
Figure 32
Connecting the Power Supply
-17-
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Beltpack Set-Up
Headset Connection
A
F
2
3
A
TRANSMIT CHANNEL
Insert the headset/microphone into the connector on
the bottom on the unit. See the headset connection
diagram (Figure 8) if a unit other than Telex headset
is used.
B
A
RECEIVE CHANNEL
B
PUSH TO SERIAL No.
TALK
PUSH TO
TRANSMIT
Figure 34
RF Channel Switches and RF Transmit Mode
Switch
RF Transmit Mode Switch
Allows the operator to select two different types of
transmitting
modes;
Push-to-talk
or
Push-to-transmit. For most operations, place the
transmitter switch in the “Push-to-talk" mode.
Figure 33
Connecting Headset
In the “Push-to-talk” mode the RF transmitter will
be on at all times regardless of whether the talk
switch is on or off.
In the “Push-to-transmit” mode, the transmitter will
be on only when the talk button is activated. The
transmitter will be turned off when the talk button is
deactivated.
RF Transmit/Receive Channel Switches
Allows the user to select which of the two RF chan-
nels the unit is on. The transmit channel selected,
either “A” or “B”, is the frequency of the beltpack’s
transmitter.
Code Switch (TR-600C Only)
The receiver channel selected, either “A” or “B”, is
the frequency the beltpack’s receiver is at. The fre-
quencies are listed on the label which is located un-
der the beltpack’s battery pack.
Allows the operator to select over 65,000 cipher
codes. The beltpack’s code must match the base sta-
tion’s code for audio recovery. Any combination of
letters and/or numbers may be selected except 0000.
The data is unencrypted when the setting is 0000.
The base station’s transmit frequency must
match the beltpack’s receive frequency. Also the
base station’s receiver must match the beltpack’s
transmit frequency. Typically the base station
switches are both set to “A” or both to “B” and
the beltpacks are set to match.
A
F 2
3
Figure 35
Code Switch
-18-
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Battery Installation
Insure that the OFF/ON volume control knob is
turned OFF. Press down the battery release latch
and remove battery pack. Pack slides off in opposite
direction. Replace batteries as follows:
1. Open the battery pack by inserting finger
nail and lifting as shown.
2. Pull battery strap to remove low or
dead batteries.
3. Load new batteries with negative end against the spring.
4. Start loading at hinged end of case.
5. Be sure strap goes under batteries and over the top of the ribs.
6. Tuck end of strap under door when closing.
Figure 36
Battery Installation
-19-
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Pre-Walk-Thru Checklist
Following the instructions fully to this point you
have successfully completed the following check-
list:
Set audio channel correctly.
Set Telex switch properly.
❒
❒
❒
Located the base station properly.
❒
Set Code Switch to a unique code that
matches the beltpack. (BTR-600C only)
Connected power to base station transceiver.
❒
Connected the 1/2-wave antennas to the base
Connected headsets to base stations (if
needed) and all beltpacks.
❒
station. Check frequency range of the antenna
with the frequency of the base station by cor-
rectly matching color codes.
❒
❒
Connected the base station to any auxiliary
audio, intercom, or external speaker if
needed.
For a large system in which a split-
❒
ter/combiner (SC-600) is used, make sure the
antenna cables are connected to the correct
ports and that the main antennas are con-
nected to the marked SC-600 ports.
Installed batteries in the beltpack.
❒
❒
If you missed any of the above instructions,
go back and complete that instruction before
going on.
Set RF transmit and receive switches on the
❒
base stations(s) to match their respective
beltpacks.
Set transmit mode switch on base station.
❒
Set wired intercom type correctly.
❒
-20-
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System Operation
Base Station Operation
LOCAL
HEADSET VOLUME
Power
TALK / OVERMODULATION
INDICATOR
If you have followed the instructions until this point
you should now be ready to turn both the beltpack
and the base station “ON”
HEADSET
MIC
GAIN
VOL
TALK/
OM
Place the power switch on the base station in the
“ON” position. The green power on indicator LED
should illuminate.
TALK
PUSH TO TALK
LOCK TO TALK
Figure 38
Push-to-Talk/Lock-to-Talk Switch and Local
Headset Volume
Microphone Gain
The microphone gain of the local headset may need
to be adjusted for various audio conditions. The
talk/overmodulation (OM) LED should be green if
the local headset microphone has been activated.
This LED will turn red when Mic Gain is too high
and will need to be turned down. If the LED does
not flash red at all and the audio is low, the gain
may need to be turned up. The gain should be ad-
justed so the LED flashes red only on loudest
speech.
Figure 37
Base Station Power Switch
Push-to-Talk/Lock-to-Talk Switch
To enable the talk function on the base station press
and hold down on the talk button and begin talking.
Releasing the talk button will discontinue the mi-
crophone audio. For continuous talk, quickly press
and release the talk button. This enables the talk
function as long as you want. To release the talk
function press and release the talk button once more
and the talk function will cease.
Using the plastic screwdriver (supplied), adjust the
control appropriately. Note that the volume heard
can also be adjusted by changing the spacing be-
tween the microphone and your mouth.
TALK/
OVERMODULATION
MICROPHONE
GAIN
INDICATOR
INCREASE
GAIN
HEADSET
MIC
GAIN
NOTE: The talk LED will be illuminated wherever
the talk function is activated.
VOL
TALK/
OM
DECREASE
GAIN
TALK
Local Headset Volume
Adjust the volume control on the base station by ro-
tating the Volume control either clockwise or coun-
terclockwise as required for comfortable listening
volume.
Figure 39
Adjusting Microphone Gain
-21-
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Aux OUT
Dual Listen Level
Adjusts the level of the base station’s audio out to
the auxiliary connector. The auxiliary “OUT” con-
trol should be adjusted so that its audio is equal to
other devices on the auxiliary system. The base sta-
tion’s audio is always supplied to the auxiliary jack
regardless of the auxiliary switch position.
This control is related to the dual listen switches. It
controls the level of the audio mix. For more infor-
mation on the dual listen switches, refer to the
“Base Station Set-Up” section.
TRANSMIT
PUSH
AUDIO
OUT
ANT.
DUAL
LISTEN
XMIT
MODE
I
/C
INTERCOM
REMOTE
CH1 + 2
TELEX
RTS
O
LEVEL
CONTROL
A
B
O
N
F
INTERCOM
F
LED
I/C 1
TRANSMIT
CHANNEL
CH2 + 1
LEVEL
CONT.
I/C
AUDIO
CHANNEL
IN
OUT TELEX
OUT
OUT
IN
1
AUTO
2
I/C
IN
AUXILIARY
LEVEL
CONTROLS
AUX
OFF
Figure 40
Dual Listen Level Control
AUXILIARY LEVEL
LED
ON
AUX
BELT PACK
LOCAL
AUXILIARY
ON/OFF
SIDETONE
Intercom Level
I/C IN
Adjusts the level of the Intercom system’s audio
into the base station. The Intercom “IN” control
should be adjusted so the intercom LED flashes red
on loudest speech over the intercom system.
Figure 41
Intercom Level Controls, AuxiliaryLevel
Controls, and Sidetone Level Controls
Sidetone Level
I/C OUT
Adjusts the level of the base station’s audio out to
the intercom system. The intercom “OUT” control
should be adjusted so that its audio on the intercom
system is equal in level to the other intercom de-
vices on the intercom system. A way to adjust this
level is to have someone talk into the base station
with a local headset while someone else listens to
the audio over the intercom system via another in-
tercom device.
Local Sidetone
This control adjusts the voice feedback to the ear-
phone of a headset plugged into the base station.
Beltpack Sidetone
The beltpack control adjusts the voice feedback to
the earphone of the beltpack’s headset.
NOTE: “Mirror Image” beltpacks have the ability
to communicate beltpack to beltpack direct. The
belpack sidetone on this version is controlled by a
level control on the beltpack, see Figure 51. If a
base station is used with one of these special
beltpacks, then its beltpack sidetone control would
have no effect on the beltpack.
Auxiliary Level
These controls should be placed fully coun-
ter-clockwise unless the Aux Jack is being used.
Noise can be added to the system if these controls
are turned up without a connection to the Aux. Jack.
Aux IN
Adjusts the level of the auxiliary input audio to the
base station. The auxiliary “IN” control should be
adjusted so that the LED flashes red on loudest
speech. The Aux. switch controls whether the base
station’s auxiliary input audio is ”ON" or “OFF”.
-22-
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Beltpack Operation
Power/Local Headset Volume
Push-to-Talk/Lock-to-Talk
You should now be ready to turn the beltpack
“ON”. Rotate the OFF/ON Volume Control Switch
on the beltpack clockwise to turn the unit on.
To enable the talk function on the beltpack press
and hold down on the talk button and begin talking.
Releasing the talk button will discontinue the mi-
crophone audio. For continuous talk, quickly press
and release the talk button. This locks on the talk
function. To release the talk function press and re-
lease the talk button once.
ON/OFF SWITCH AND VOLUME CONTROL
BAT/ TALK
O.M.
CHANNEL
NOTE: The talk LED will be illuminated whenever
the talk function is activated.
O
F
F
2
1
ON
VOLUME
TALK
AUDIO
BAT/ TALK
O.M.
CHANNEL
O
2
1
F
F
Figure 42
Off/On Volume Control Switch
ON
VOLUME
TALK
AUDIO
PUSH-TO-TALK / LOCK-TO-TALK SWITCH
Battery Check
As you rotate the OFF/ON volume control knob
clockwise to turn the unit on, note that the battery
LED (Labeled “BAT/O.M.”) should flash one time
on good batteries. Poor batteries will cause the LED
to be illuminated continuously and a bad or unus-
able battery will not cause any illumination at all.
Figure 44
Push-to-Talk/Lock-to-Talk Switch
Microphone Gain
The microphone gain of the beltpack’s headset may
need to be adjusted for various audio conditions.
The Battery/Overmodulation (O.M.) LED will flash
red when Mic Gain is too high and will need to be
turned down. If the LED does not flash red at all,
and the audio from the unit sounds low, then the
gain may need to be turned up. The gain should be
adjusted so the LED flashes red only on loudest
speech.
LOW BATTERY AND OVERMODULATION
INDICATOR LED
BAT/ TALK
CHANNEL
O
2
1
O.M.
F
F
Using the plastic screwdriver (supplied), adjust the
control appropriately. Note that the volume heard
can also be adjusted by changing the spacing be-
tween the microphone and your mouth.
ON
VOLUME
TALK
AUDIO
Figure 43
Low Battery and Overmodulation Indicator
LED
-23-
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Specially ordered beltpack to beltpack (Mirror Im-
age) direct communication units have their sidetone
controlled by a control on the beltpack. To adjust
the voice feedback to the earphone (sidetone) of
these units, simply turn the control until the
sidetone is at a comfortable level.
BATTERY/
OVERMODULATION
INDICATOR
MICROPHONE
GAIN
V O L U M E
T A
O N
L K
INCREASE
GAIN
A U D I O
F
F
O
O
. M
.
B A
T /
1
C H A N N E L
2
SIDETONE
LEVEL
x
e
l
e
T
CONTROL
INCREASE
DECREASE
GAIN
GAIN
V O L U M E
T A
O N
L K
A U D I O
F
F
O
O . M .
B A
T /
1
C H
A N N
E L
2
x
e
l
e
DECREASE
GAIN
T
Figure 45
Microphone Gain
Sidetone Level
Regular TR beltpacks have their sidetone control lo-
cated on their respective base stations (See the
sidetone level part of the base station “Operation
Section”).
Figure 46
Sidetone Level Control
-24-
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Example System Configurations
Single Base Station Audiocom (Telex) System
The audio out of the base station’s RCA jack is the
audio channel currently switched to at the BTR-500.
The audio out RCA jack on the back of this unit is
used for the public address system. The unused
Audiocom channel must be terminated to avoid
loud feedback if audio channel two was switched to
by the beltpack.
TARGET
AREA
LOUD
SPEAKER
AUDIO CHANNEL 1 = RANGE INSTRUCTIONS
AUDIO CHANNEL 2 = NOT USED
SHOOTING
AREA
LOUD
SPEAKER
PA SYSTEM
1 CH
SHOOTER'S WIRED BELTPACKS
1 CH
1 CH
1 CH
1 CH
1 CH
AUDIOCOM
POWER SUPPLY
T
elex
RANGE
TRMIT
RE
LOOP
THRU
BTR-500
DIRECTOR
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT
.
ANT
.
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
BTR-500
TELEX
RTS
CH2
CH2
+
2
A
B
O
A
B
O
F
N
F
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CONT.
LEVEL
CHANNEL
TELEX
LOAD
Figure 47
Example single BTR-500 Audiocom System used at a Shooting Range
-25-
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Single Base Station RTS System
ON
HTING/CURTAIN
1 CH
B.P.
1 C
B.P.
1 CH
B.P.
SPOTLIGHT
2 = AUDIO EFFECTS/
LIGHTING/CURTAIN
AUDIO
EFFECTS
2 = AUDIO EFFECTS/
LIGHTING/CURTAIN
STAGE
LIGHTS
2 = AUDIO EFFECTS/
LIGHTING/CURTAIN
RTS
POWER SUPPLY
1 CH
B.P.
2 CH
B.P.
RTS
CURTAIN
DIRECTOR
2 = AUDIO EFFECTS/
DISTRIBUTION PANEL
1 = STAGE/DIRECTION
2 = AUDIO EFFECTS/
LIGHTING/CURTAIN
TRIT
R
LOOP
THRU
BTR-500
FCC ID. B5DM503
MADE IN U.S.A.
PATENT PENDING
PUSH
PUSH
AUDIO
OUT
ANT.
ANT.
DUAL
LISTEN
XMIT
MODE
REMOTE
I
/C
TELEX
RTS
CH2
CH2
+
2
A
O
A
B
O
N
F
F
B
POWER
12-15V
AC/DC
I/C
1
I/C
I/C
2
TRANSMIT
CHANNEL
+
1
AUX
RECEIVE
CHANNEL
LEVEL
BACKSTAGE
CONT.
MANAGER
1 = STAGE/DIRECTION
2 = AUDIO EFFECTS/LIGHTING/CURTAIN
Figure 48
Example Single BTR-500 RTS System used at a Small Play Production
-26-
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Six Base Station RTS System
R
Telex
ALP-450
THIS END TOWARD TRANSMITTER
TRANSMIT
ANTENNA
FIXED STATIONS
R
T
elex
RECEIVE
ALP-450
THIS END TOWARD TRANSMITTER
ANTENNA
2 CH
B.P.
2 CH
B.P.
2 CH
B.P.
AUDIO
MIXER
TECH
DIRECTOR
DIRECTOR
BTR-500s
A
B
A
B
LOOP
THRU
LOOP
THRU
PUSH
PUSH
PUSH
PUSH
ANT.
ANT.
XMIT
MODE
RTS REMOTE CH2
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
F
O
N
A
B
O
O
F
N
F
1/C
TRANSMIT
CHANNEL
CH2
+
1
AUX
1/C
CONT.
LEVEL
TRANSMIT
CHANNEL
+
1
AUX
CONT.
LEVEL
A
A
A
A
B
B
FIXED STATIONS
B
B
LOOP
THRU
LOOP
THRU
PUSH
PUSH
PUSH
PUSH
ANT
.
ANT.
XMIT
MODE
REMOTE
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
RTS
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
O
N
A
B
O
F
O
F
N
F
1/C
TRANSMIT
CHANNEL
+
1
AUX
1/C
CONT.
LEVEL
TRANSMIT
CHANNEL
+
1
AUX
CONT.
LEVEL
PUSH
PUSH
PUSH
PUSH
ANT
.
ANT.
XMIT
MODE
REMOTE
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
RTS
CH2
CH2
+
2
TELEX
RTS
CH2
+
2
A
B
O
F
O
N
A
B
O
F
O
F
N
F
TRANSMIT
CHANNEL
+
1
1/C
LEVEL
AUX
CONT.
TRANSMIT
CHANNEL
CH2
+
1
1/C
AUX
CONT.
LEVEL
2 CH
B.P.
2 CH
B.P.
TAPE
OPERATOR
VIDEO
OPERATOR
RTS
DISTRIBUTION PANEL
RTS
POWER SUPPLY
A
B
AUDIO CHANNEL 1 = MAIN PRODUCTION
AUDIO CHANNEL 2 = PRIVATE LINE
DC
OUTPUT
RECEIVE
TRANSMIT
TRANSMIT
ANTENNA
RECEIVE
ANTENNA
110/220 VAC INPUT
FUSE:
F
1.5A 250V
SC600
50
TERMINATORS
FOR TWO UNUSED
RX PORTS
(
(
TR-500s
Telex
Telex
T
elex
T
elex
Telex
CAMERA 2
FLOOR
MANAGER
FLOOR
AUDIO
CAMERA 1
EXTRA
Figure 49
Example of Six BTR-500 RTS Systems used by a Production Unit
-27-
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Eight Base Station Telex System
1 = BELTPACK POSITION 1
2 = BELTPACK POSITION 2
*
SPOTTER
1 = MAIN DEF
2 = PRIVATE DEF
POSITION COACH
1 = MAIN DEF
2 = PRIVATE DEF
EXTRA
1 = PRIVATE OFF
2 = PRIVATE DEF
DEFENSIVE COACH
1 = MAIN DEF
AUDIOCOM
POWER SUPPLY
2 = PRIVATE DEF
*
*
*
*
AUDIO CH 3
INTERCOM
ASSIGNMENT / DISTRIBUTION
PANEL
PRESS BOX
AUDIO CH 1
AUDIO CH 2
2 CH
AUDIO
CABLE
INTERCOM
ASSIGNMENT / DISTRIBUTION
PANEL
SPOTTER
1 = MAIN OFF
POSITION COACH
1 = MAIN OFF
OFFENSIVE COACH
1 = MAIN OFF
2 = PRIVATE OFF
2 = PRIVATE OFF
2 = PRIVATE OFF
*
*
*
AUDIO CH 4
B
A
A
A
B
LOOP
THRU
LOOP
THRU
PUSH
PUSH
H
PUSH
A
ANT.
XMIT
MODE
REMOTE
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
RTS
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
O
A
B
O
O
N
F
F
N
F
TRANSMIT
CHANNEL
+
1
1/C
AUX
1/C
LEVEL
TRANSMIT
CHANNEL
+
1
CONT.
LEVEL
AUX
CONT.
A
B
B
LOOP
THRU
LOOP
THRU
PUSH
PUSH
PUSH
PUSH
ANT.
A
XMIT
MODE
REMOTE
RTS
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/
C
I
/C
TELEX
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
A
B
O
O
N
O
F
F
N
F
1/C
TRANSMIT
CHANNEL
+
1
AUX
TRANSMIT
CHANNEL
+
1
1/C
LEVEL
CONT.
CONT.
LEVEL
AUX
BTR-600C
A
A
A
A
B
B
B
B
LOOP
THRU
LOOP
THRU
PUSH
PUSH
PUSH
.
A
ANT
ANT
.
XMIT
MODE
REMOTE
RTS
DUAL
LISTEN
AUDIO CHANNEL 1 = MAIN OFFENSE
AUDIO CHANNEL 2 = PRIVATE OFFENSE
AUDIO CHANNEL 3 = MAIN DEFENSE
AUDIO CHANNEL 4 = PRIVATE DEFENSE
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
CH2
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
A
B
O
O
O
N
F
F
N
F
1/C
TRANSMIT
CHANNEL
+
1
AUX
TRANSMIT
CHANNEL
+
1
1/C
CONT
.
LEVEL
CONT.
LEVEL
AUX
LOOP
THRU
LOOP
THRU
PUSH
PUSH
PUSH
PUSH
A
ANT
.
XMIT
MODE
REMOTE
DUAL
LISTEN
XMIT
MODE
REMOTE
DUAL
LISTEN
I
/C
I
/C
TELEX
RTS
CH2
+
2
TELEX
RTS
CH2
CH2
+
2
A
B
O
F
O
N
A
B
O
O
F
F
N
F
1/C
TRANSMIT
CHANNEL
CH2
+
1
AUX
CONT.
LEVL
TRANSMIT
CHANNEL
+
1
1/C
AUX
CONT.
LEVEL
A
B
Telex
TX ANTENNA
Telex
DC
OUTPUT
RECEIVE
TRANSMIT
TRANSMIT
ANTENNA
RECEIVE
ANTENNA
110/220 VAC INPUT
FUSE:
F
1.5A 250V
COAXIAL
CABLE
RX ANTENNA
SC600
ON FIELD
Telex
Telex
Telex
Telex
Telex
Telex
Telex
Telex
COACH 5
DEFENSE
HEAD
COACH
COACH 2
OFFENSE
COACH 3
OFFENSE
COACH 4
OFFENSE
COACH 6
DEFENSE
COACH 7
DEFENSE
COACH 8
EXTRA
BELTPACK
BELTPACK
1 = MAIN OFF
BELTPACK
1 = MAIN OFF
BELTPACK
BELTPACK
BELTPACK
1 = MAIN DEF
BELTPACK
1 = MAIN DEF
BELTPACK
1 = PRIVATE OFF
1 = MAIN OFF
2 = MAIN DEF.
1 = MAIN DEF
2 = PRIVATE DEF
1 = MAIN OFF
2 = PRIVATE OFF
*
2 = PRIVATE OFF 2 = PRIVATE OFF
2 = PRIVATE DEF 2 = PRIVATE DEF 2 = PRIVATE DEF
*
*
*
*
*
*
*
Figure 50
Example of an Eight BTR-600C Audiocom(Telex) System being used by a Football Team
-28-
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Beltpack to Beltpack System
The following is an example of a beltpack to
beltpack system. The two operators need to be in
constant, full-duplex communication with each
other in a noisy paper press environment.
Single Beltpack to Single Beltpack System
RF
RF
TX = FREQ 1
RX = FREQ 2
RF
RF
TX = FREQ 2
RX = FREQ 1
Telex
Telex
Figure 51
Example of a TR-500 System used at a Publishing Firm
-29-
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System Walk-Thru
Now that you have successfully “set up” your Telex
Wireless Intercom System and turned on any auxil-
iary equipment you are ready to test the overall per-
formance by “Walking” the Telex system through
the areas in which you will be using it.
The “system walk-thru” can detect problems of
weak signal strength caused by:
·
·
·
·
·
Poor antenna location
Wrong antenna for receiver and/or transmitter.
RF “Trouble Spots”
Before you begin your walk-thru, check the follow-
ing:
Operating distance beyond system capability.
Old or used batteries in the TR-500/600
Beltpack Battery Check.
❒
Under normal conditions the indicator LED on the
base station’s beltpack should always be lit when
their beltpacks are transmitting. “Weak Signal” con-
ditions will result in flashing, or the complete loss
of this Carrier LED.
Set microphone gain in both the beltpack and
❒
the base station.
Check that the push-to-talk switch is engaged
❒
in the lock-to-talk position. LED will be illu-
minated.
In 99% of all instances you will set up your Telex
Wireless Intercom System, walk it through and
achieve error-free performance. If in the rare in-
stance your Telex system does not “pass” during
your walk-thru evaluation, refer to the section of
this manual which deals with System Trouble-
shooting.
I/C Level “IN” and “OUT” are set to an ap-
❒
propriate level and not turned to zero.
Sidetone local and beltpack levels are set to
❒
an appropriate level.
-30-
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TROUBLESHOOTING
Reread the sections of this manual to make sure you
have completed system set-up properly
If you are unable to solve the problem, contact the
dealer from whom you purchased the system for as-
sistance.
PROBLEM
SOLUTION
DISTORTION - System’s audio quality seems
distorted at medium to high input levels.
Reduce microphone gain by adjusting
microphone gain control.
HISS - System seems to produce a “hiss” which is
undesirable.
Check the gain setting on all beltpacks and the
base. They may be too low.
LOW OUTPUT - System produces a low output
level.
Check the gain setting on both the beltpacks and
the base. They may be too low.
FEEDBACK - Moving around area of use
produces “squeal” or “howl” in various locations
using ext. speakers.
Reduce the gain settings on both the beltpacks and
the base. They may be too high.
Make sure both antennas on the base are
connected and follow the location suggestions.
Change the location of the base unit and antennas
or avoid the bad areas with the remote beltpacks.
DROPOUTS - When moving around the area of
use there seems to be locations where the signal
“swooshes” or completely disappears.
Make sure the Telex beltpack is turned on - this
will usually eliminate the interfering signal. If not
using a beltpack, make sure the transmit mode
switch at the base is in the off position.
INTERFERENCE - System picks up signals
other than wireless Intercoms.
If problems persist with the beltpack on, you will
probably need to change frequency channels.
Make sure the base channel switch matches the
beltpack.
Check Transmitter switch on base, use CONT or
REMOTE position. Check push-to-talk function -
is the switch ON. Make sure beltpack batteries are
OK.
NO AUDIO from BASE or BELTPACK headsets.
-31-
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Tech Tips
Codes Settings and the BTR600C
Frequency Interaction
While the BTR-600C and corresponding TR-600C
have over 65,000 different codes that may be se-
lected by the user, there are actually over 16 million
different codes in the units. The microprocessor in
each base station and corresponding beltpack has
two unique numbers programmed into them from
the factory. The external four code switch settings
are used in conjunction with these two internal,
non-accessible, numbers to encrypt and decrypt au-
dio sent to and from the units.
Unfortunately, radio frequency (RF) channels can-
not be randomly selected for use in radio devices.
They must be selected to avoid known frequencies
in use, FCC restrictions on the location of devices,
and even interference between your own RF de-
vices. The channels selected by Telex for Radiocom
systems are chosen to minimum possible interfer-
ence. This is why it is always important to inform
Telex about frequencies of other Radiocom or other
RF devices that will be used with any additional
Radiocom equipment ordered.
Microphone Gain Adjustment
The microphone gain controls on the base station and beltpack are set to mid-levels by the factory. In
most cases this setting will work fine and only on loudest speech will the overmodulation (OM) indicator
light. However, in environments where the background noise is loud or the user has a strong/quiet voice,
the gain control will need to be adjusted. In Figure 52 the gain is set correctly. The user’s
root-mean-square (RMS) sound level is well below the OM threshold and only on a few loud peaks does
his or her voice flash the OM indicator light. Figure 53 displays the same gain setting as in Figure 52, but
brought into a high noise environment. The user’s voice now lights the OM indicator over half the time he
or she speaks due to the higher noise plus the user speaking louder. The result on the system is distortion
with possible “clipping” on louder speech. The microphone gain must be reduced. The same applies to a
user with a powerful voice. If someone sets the system mic gain to their voice and user has a much stron-
ger voice, then the gain will need to be reduced, even if the background noise is the same.
Always remember to set the microphone gain based on the situation and location in which the equipment
will be used. If the equipment is used on the field during a football game, set the gain based upon a loud
stadium, NOT the quiet stadium 2 hours before a game. If a production studio user has a quiet voice, set
the gain to their voice and NOT the stage hand’s loud voice who helped set up the system.
USER'S VOICE
OM THRESHOLD
USER'S VOICE
NOISE
OM THRESHOLD
NOISE
Figure 52
Figure 53
Low Noise Environment
High Noise Environment
Microphone Gain Set Correctly
Microphone Gain Set Too High
-32-
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Battery Information
Improper battery selection, use, installation and care
are the cause of numerous wireless system failures.
Nickel-Metal Hydride Batteries: These batteries
can save you money in the long run, as they can be
recharged. Typical battery life is 8 to 9 hours, which
is about 70% of the length of time alkaline batteries
last.
Alkaline Batteries: Alkaline batteries such as
Mallory’s DURACELL® or Eveready’s ENER-
GIZER® provide the most reliable operation in
wireless transceivers. Typical battery life of fresh al-
kaline batteries is 12 hours. The use of low cost
carbon-zinc batteries is NOT recommended.
Energizer® is a registered trademark of Union Carbide Corporation.
Duracell® is a registered trademark of Duracell Inc.
Intercom Systems Specifications
RTS
COMMON
Input Impedance: ..............................................200W
Output Level: ............................0.775 Vrms nominal
Bridging Impedance: ......................................>10kW
Call Signalling:
AUDIO 1 PLUS POWER
1
2
Send: ...................20kHz ±100 Hz, 240 mVrms
Receive: .............20kHz ±800 Hz, 100 mVrms
3
AUDIO 2
MALE
Power Voltage: ...........................28.0 VDC nominal
AudioCom/Telex
COMMON
Input Impedance: ..............................................300W
Output Level: ................................1.0 Vrms nominal
Bridging Impedance: ......................................>10kW
Call Signalling:
AUDIO ( - ) PLUS POWER
1
2
Send: ....................20kHz ±100 Hz, 0.5 mVrms
Receive: .............20kHz ±800 Hz, 100 mVrms
3
AUDIO ( + ) PLUS POWER
MALE
Power Voltage: ...........................24.0 VDC nominal
COMMON
POWER
Clear-Com
Input Impedance: ..............................................200W
Output Level: ...............................200 Vrms nominal
1
2
Bridging Impedance: ......................................>10kW
Call Signalling:
Send:.................................................12 ±3 VDC
Receive: ................................4 VDC Minimum
3
AUDIO
MALE
Power Voltage: ...........................30.0 VDC nominal
-33-
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Accessories and Replacement Parts
ALP-600
520-760 MHz Bi-Directional Log Periodic Antenna
Includes mounting hardware and 10 feet (3 meters)
of coaxial cable with TNC Connectors
Order No. 878896
Te l x
e
ALP-450
THIS END TOWARD TRANSMITTER
Telex
ALP-450
450-900 MHz Log Periodic Antenna
Includes mounting hardware and 10 feet (3 meters)
coaxial cable with TNC connectors
Order No. 71147000
Antenna Cables: Special low loss antenna cables
with TNC Connectors.
BTR Power Supply .................................PN 730127
Model No.
Length
Order No.
690419
BTR Intercom Patch Cable.....................PN 690412
CXU-10
CXU-25
CXU-50
CXU-75
CXU-100
10 Ft. (3 meter)
25 Ft. (7.6 meter)
50 Ft. (15 meter)
75 Ft. (23 meter)
100 Ft. (30 meter)
BTR Intercom Dummy Load
71151-025
71151-050
71151-075
71151-100
Telex type............................................PN 878935
RTS type..............................................PN 878990
TR Battery pack, alkaline
(batteries not included)..................PN 71215-000
TR Nickel Metal Hydride Battery pack
with “Smart Charger” ....................PN 71215-200
TR Nickel Metal Hydride
Battery pack...................................PN 71215-002
1/2-Wave Antenna
SC600 Splitter/Combiner...................PN 71197-000
Single 19" Rack Mount Kit ...............PN 71081-006
Mounts one base station in a 19" rack
Dual 19" Rack Mount Kit..................PN 71081-007
Mounts two base stations, side by side
in a 19" rack
Signal Switch Option...........................PN 878811-1
This option allows the user of a beltpack to re-
motely activate special relay contacts on a base
station
Model No.
Part No.
Band Color
Blue
Frequency
520-564.9 MHz
565-614.9 MHz
615-659.9 MHz
660-689.9 MHz
690-724.9 MHz
725-760 MHz
CLA-1
CLA-2
CLA-3
CLA-4
CLA-5
CLA-6
870658-1
870658-2
870658-3
870658-4
870658-5
870658-6
Yellow
Red
CCB-1 Interface Device
White
Interfaces Telex balanced to ClearCom
unbalanced. One CCB-1 is required for each au-
dio channel.
Green
Orange
Order No. 96230-000
-34-
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CUSTOMER SERVICE INFORMATION
If your receiver or transmitter should need servicing, please contact:
Customer Service Department
TELEX COMMUNICATIONS, INC.
8601 East Cornhusker Highway,
P.O. Box 5579,
Lincoln, Nebraska 68505-5579 U.S.A.
Phone: (402) 467-5321 or 465-7021
All claims of defect or shortage should be sent to the above address. When returning items
for service, you must provide date and proof of purchase, such as a copy of the sales receipt,
to establish warranty. A letter should be included outlining all symptoms and claimed de-
fects. Information on how the equipment was installed and used is very helpful. Please in-
clude your phone number and return address in case our service technicians need to contact
you.
Units that have been modified cannot be accepted for repair.
Include all information requested by the Service Department. Then pack the unit as follows:
Check the unit to see that all parts and screws are in place. Then wrap it in heavy paper or
put it in a plastic bag. If the original carton is not available, place the unit in a strong carton
that is at least six inches bigger in all three dimensions than the unit. Fill the carton equally
around the unit with resilient packing material (shredded paper, foam, etc.). Seal it with
gummed paper tape, tie it with a strong cord, and ship it by prepaid express, United Parcel
Service or insured parcel post to the Telex Service Department.
It is very important that the shipment be well-packed and fully insured. Damage claims
must be settled between you and the carrier and this can delay repair and return of the unit
to you.
Telex reserves the right to make changes in design and improvement on its product without
assuming any obligation to install the same on any of its products previously manufactured.
Further Telex reserves the right to ship new and/or improved products which are similar to
the form, fit and function of products originally ordered.
-35-
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FCC INFORMATION
The Telex BTR-500/600C and the TR-500/600C Transmitter/Receiver are Type Ac-
cepted under United States Federal Communications Commission Part 74. Licensing
of Telex equipment is the User’s responsibility and licensibility depends on the user’s
classification, users application, and frequency selected. Telex strongly urges the user
to contact the appropriate telecommunications authority for any desired clarification.
CAUTION: Changes or modifications made by the user could void the user’s author-
ity to operate the equipment.
-36-
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R
TELEX COMMUNICATIONS, INC. 12000 Portland Ave. South, Burnsville, MN 55337.
•
PN 801567-2
JAN 2001
Made in U.S.A.
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