INSTRUCTION FOR USE
EM 203
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Introduction
The wireless Mikroport multi-channel sound transmission system EM
1046 is a transmitter/receiver system in a modular design. It offers
comfortable handling and can be relied on for dependable service.
•
3-channel diversity receiver EM 203 with microprocessor-controlled
receiver modules
•
Ultimate flexibility in the selection of transmitter and receiver
frequencies thanks to easy-to-replace PROMs and EEPROMs.
The present manual shall help you to get acquainted with the EM 203
receiver.
•
•
The chapter "START-UP PROCEDURE" helps you to connect the
unit to the mains and to put it to work.
The chapter "AVAILABLE MODULES" provides you with
information on every single module. It explains how to adjust them
to satisfy your individual transmission requirements.
The necessary modules for this receiver system are incorporated into a
"Mainframe". For programming and servicing, the EM 1046 RX
receiver modules can be removed to the front. Output module, input
module and mains power supply module, however, are integral parts of
the system.
IMPORTANT INFORMATION
Each HF input is supplied with a wideband power distributor 1:3,
which intendedly does not affect the adjustment possibilities of the
EM 1046 RX receiver modules. In order to achieve sufficient sensitivity
and protection against subscriber's extention stations, an antenna with
booster and pre-selection is required. In general, Sennheiser's
AB 1036 TV antenna booster is used.
Refer programming of the EEPROMs in the receiver modules to
qualified service personnel or Sennheiser's Service Department,
30900 Wedemark, Germany.
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Technical overview
1
Computer control
Diversity
1.1
1.2
1.3
1.4
HiDyn plus® noise reduction
Block diagrams
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Computer control
1.1
Every single EM 1046 RX receiver module has an in-built micro-
processor for the RF section, the operating elements and all indicators.
It serves to control the following components or parameters:
•
•
•
•
•
•
•
•
•
•
phase locked loop (PLL) synthesizer
function of keys
8 digit LED display
two LED bargraph displays
true diversity
monitoring
squelch threshold
description fields
stand-by
storage of all receiver parameters (e. g. receiver frequencies) in a
permanent memory
During diversity operations, the microprocessor controls every one of the
two receiver chains that are combined on one module.
The receiver parameters and the selectable frequencies can easily be
changed with the help of a conventional computer system as every
receiver module incorporates an additional service interface. Changes
are only possible within the admissible RF bandwidth.
The software can easily be adapted to your individual requirements and
updated at any time by Sennheiser’s Service Department. Our
servicemen simply replace the PROM in the receiver modules.
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1.2
Diversity
Control signal
Control signal
Automatic electronic switching
of audible frequency signal
Receiver 1
Receiver 2
Steuersignal
Every EM 1046 RX receiver module operates on true diversity.
An antenna splitter, integrated into the chassis, serves to route the
antenna signals from both antennas to the three receiver modules.
The receiving antenna not only receives direct electromagnetic waves,
but also reflections from walls, windows, ceilings and other installations,
which results in the cancellation of these waves, so-called „field strength
gaps“. Repositioning the receiving antenna is a possible remedy,
provided the transmitter remains in its original position. However,
as most transmitters are used for portable applications, the
„field strength gaps“ then occur in other positions. The effects of
field strength variations can only be eliminated through the use
of true diversity techniques.
Sennheiser’s specially developed diversity system is based on two
receivers operating on the same frequency and two separate antennas.
A comparator ensures that the receiver with the strongest RF signal is
automatically and noiselessly switched to the AF output. Diversity
operations can compensate for considerable variations in field strength,
thus providing an enormous gain in transmission reliability.
Nota bene: Every single EM 1046 RX receiver module incorporates two
receivers for diversity operation.
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®
1.3
HiDyn plus
DYNAMICS OF THE AUDIO SIGNAL
IN THE RF-SIGNAL (MAX 60 DB)
COMPRESSION AT
THE TRANSMITTER
EXPANSION AT THE
RECEIVER
HIDYN plus®
HIDYN plus®
SYSTEM NOISE PLUS MODULATION/DEMODULATION
NOISE IN THE TRANSMITTER PATH
»HIDYN plus®« NOISE REDUCTION SYSTEM
The »HIDYN plus®« noise reduction system serves to reduce the effects
of RF interference fields. It increases the signal-to-noise ratio and gets
close to about 110 dB for peak modulation.
»HIDYN plus®« is a wideband compander system. It is a combination of
a compressor at the transmitter (ratio 2:1) and an expander at the
receiver, the compressor reducing the volume of the signal and the
expander restoring it. The optimized dynamic range and the control
amplifier in the transmitter effectively reduce modulation problems.
»HIDYN plus®« has been expecially developed by Sennheiser for studio
and stage applications.
Its features:
•
•
•
extemely low degree of noise modulation
level compensation
excellent dynamic range due to the control amplifier
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1.4
Block diagram EM 203
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Possible transmitter/
receiver combinations
2
EM 203 receiver/
2.1
2.2
2.3
SK 2012 TV (HiDyn plus®)
and SKM 4031 TV-HiDyn plus®
Transmitters
EM 203 receiver/
SK 50/250 UHF
and SKM 5000 (HiDyn plus®)
Transmitters
EM 203 RECEIVER/
SER 20 TRANSCEIVER
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2.1
EM 203 receiver/
SK 2012 TV (HiDyn plus®)
and SKM 4031 TV-HiDyn plus®
MKE 2-2 R
MKE 102-2 R
MKE 10-2 R
NOTA BENE
SK 2012 body-pack transmitters can be
retrofitted (change from HIDYN® to HIDYN
plus®) to make them suitable for use with EM
1046 receivers.
SK 2012 TV (HiDyn plus®)
To this purpose please send the transmitters to
be retrofitted to Sennheiser's Service Depart-
ment, 30900 Wedemark.
Attention: After the transmitters have been
retrofitted, they are no longer compatible with
HIDYN®
.
NOTA BENE
SKM 4031 TV-HiDyn plus®
SKM 4031 TV transmitter microphones can be
used in conjunction with EM 203 systems if
they incorporate a HIDYN plus® compander.
This is the case with SKM 4031 HIDYN plus®
condenser microphones.
2 GZA 1036 TV
450 - 800 MHz
or
Models incorporating a compander can be
retrofitted. To this purpose please send the
microphones to Sennheiser's Service Depart-
ment, 30900 Wedemark, Germany.
2 GZA 1036-9
140 -960 MHz
Attention: After the transmitters have been
retrofitted, they are no longer compatible
AB 1036 TV
with HIDYN®
.
EM 203 receiver
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EM 1046/
SK 50 UHF / SK 250 UHF
and SKM 5000
2.2
SKM 5000
MKE 2-4
MKE 102-4
MKE 10-4
SK 50 UHF / SK 250 UHF
2 GZA 1036 TV
450 - 800 MHz
or
2 GZA 1036-9
140 -960 MHz
AB 1036 TV
EM 203 receiver
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EM 203 receiver/
SER 20 transceiver
2.3
Retrofitted SER 20 transceivers (change from
HIDYN© to HIDYN plus©) can be used in
conjunction with EM 203 receivers.
SER 20 transceiver
with HiDyn plus©
Refer retrofitting to Sennheiser distributors
or Sennheiser's Service Department,
30900 Wedemark, Germany.
At the time that the present brochure went to
print the retrofit kit for the SER 20 transceiver
was already under development. Please contact
your Sennheiser distributor for further
information on the exact date of delivery.
2 GZA 1036 TV
450 - 800 MHz
or
2 GZA 1036-9
140 -960 MHz
Another possibility:
If you don't need the advantages of HIDYN
plus© (e.g. in order to operate with older
equipment), the EM 203 receiver can be
modified to HIDYN©.
AB 1036 TV
EM 203 receiver
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Putting the EM 203 receiver
to work
3
Mains connection 3.1
Antenna connection
AF connection
3.2
3.3
Start-up procedure/
operating indicators
3.4
EM 203, Publ. 10/94 engl
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Mains connection
3.1
Power is supplied by a plug-in power supply
unit.
The power module is available as a 110, 230 or
240 V AC model. The unit can easily be
adapted to changing power requirements by
replacing the power module.
Connection of the plug-in power supply unit is
via socket P at the back panel of the EM 203.
P
Antenna connection
3.2
The two antennas needed for diversity
operation (see ch. 1.2) connect to sockets
A and B on the EM 302RI module
(N-type sockets).
ANTENNA
SOCKET
A
The AB 1036 TV antenna boosters connected
in series are powered via sockets A and B. The
supply voltage can be switched on or off by
means of the switches next to the antenna
sockets.
If the antenna boosters are in operation, the
control LEDs for the booster supply voltage
light up at the front panel (→ ch. 4.2.1).
ANTENNA
SOBCKET
AF connection
3.3
The AF output signals from every single EM
1046 RX receiver module are available at AF
outputs 1 to 3 on the EM 203 module (floating,
transformer-balanced). The connection is made
through XLR-3 plugs.
The switches at the left-hand side of the XLR
outputs ("PAD") allow to attenuate the output
signals by 20 dB.
AF-OUTPUTS
1 - 3
(MAX +18 DB)
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Start-up procedure/
Operating indications
3.4
POWER
+ 12 V
- 12 V
+ 5 V
DC - A
DC - B
OL - A
OL- B
REMOTE
+ 20
dB
+ 20 dBu
(RX)
DISPLAY
MANIPULATION
FUNCTION
This is how the channel module indicates that
it is ready for operation (after power-up). The
three LED indicators for the operating voltages
light up (see ch. 4.2.1).
Switch on the receiver:
The display changes after about 5 seconds
It shows the frequency on which the mdoule is
operating
or
the name of the user, e. g. "THE CAT":
NOTA BENE
Put the transmitters to work (see their user’s
guide).
Check both transmitters and receivers for
identical frequencies. Check whether or not
the transmitters’ battery capacity is sufficient
for the planned applications.
Sennheiser SK 50, SK 250 and SK 5000
Mikroport transmitters automatically
transfer data on the condition of their
batteries or rechargeable battery packs to
the EM 203receiver. If the LowBatt indicator
starts blinking on one of the displays, the
batteries or rechargeable battery packs
of the transmitters concerned are to be
replaced or recharged.
The capacity of the transmitter battery is
insufficient for proper operation.
The transmitter will be switched off in
about 10 minutes.
EM 203, Publ. 10/94 engl
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Available modules
4
EM 1046 RX
receiver module
4.1
4.2
Monitor
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EM 1046 RX receiver module
4.1
Adjustment
4.1.1
4.1.2
4.1.3
4.1.4
Receiver frequencies
Squelch
Selection
RF Signal level/deviation/
battery condition
Display
4.1.5
4.1.6
Text/frequency/battery condition
Entry of brief texts
System configurations
and specifications
4.1.7
4.1.8
Remote monitoring
Of transmitter battery
Monitoring of audio signals
Stand-by
4.1.9
4.1.10
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OPERATING ELEMENTS ON THE EM 1046 RX MODULE
8 DIGIT
ALPHANUMERIC
LED DISPLAY
RACK CONNECTOR
(invisible)
KEYS TO CONTROL
THE MENU AND TO
PROGRAM THE MODULE
INDICATOR FOR REMOTE
MONITORING
DIVERSITY
CHANNELS
LED BARGRAPH DISPLAYS FOR
DEVIATION/RF SIGNAL LEVEL/
BATTERY CONDITION
MONITOR KEY
STAND-BY
APPROVAL NUMBER
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Adjustment
4.1.1
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
The receiver switches to the menu mode. It is
now ready for data entry.
Depress an arbitrary menu key on the
EM 1046 RX receiver module:
Y
Receiver operation remains unaffected.
or:
N
The receiver is not set to the new parameters
unless the new data are stored!
or:
SET
or:
ESC
Different functions can be selected from the
menu by depressing the following keys:
Selection of receiver frequencies
Please see chapter 4.1.2
Squelch
Please see chapter 4.1.3
N
DOWN
LED bargraph displays for RF signal level/
deviation/battery condition
Please see chapter 4.1.4
UP
Y
Display - text or frequency
Please see chapter 4.1.5
Text
Please see chapter 4.1.6
NOTA BENE
Depress
Display of EM 1035 RX configuration and
identification data
ESC
Please see chapter 4.1.7
to return to the previous level.
This key also serves to stop data entry in case
of errors.
Battery condition (SK 50/250)
Please see chapter 4.1.8
EM 203, Publ. 10/94 engl
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Receiver frequencies
4.1.2
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Chose option "RX-Freq." (chapter 4.1.1).
Depress
SET
to allow the receiver frequencies to be selected.
The "M" on the display starts blinking.
The EM 1046 RX receiver module can be configured as follows:
•
•
operation on max. 32 switchable frequencies or
variable adjustment of receiver frequencies (5 kHz grid) within
16 frequency ranges
The frequencies or frequency ranges selected must fall within the
system's 24 MHz window. The configuration selected is stored in the
EM 1046 RX receiver module by a personal computer via the service
interface or by the remote computer. The configuration can be changed
as often as desired.
Refer changes to the system configuration to your authorized
Sennheiser distributor.
24 MHz maximal
24 MHz maximal
24 MHz maximal
Example 1:
Variable adjustment within one frequency range (in the present case the
total bandwidth of the system.
Example 2:
Variable adjustment within three frequency ranges. The frequencies
between two adjacent frequency ranges cannot be used.
Example 3:
Seven selectable frequencies. The EM 1046 RX receiver modules come
with this standard setting.
EM 203, Publ. 10/94 engl
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CONTINUED FROM PAGE 20 / CH. 4.1.2
(RX)
DISPLAY
MANIPULATION
FUNCTION
Use keys
UP
Y
DOWN
N
to select a receiver frequency as per
pre-programmed parameters.
•
Freely selectable receiver frequencies can
easily be adjusted in a 5 kHz grid. The unit
changes automatically from one grid to
another.
•
Keeping the key depressed
acdelerates selection.
•
For standard frequencies the display
automatically switches to the next channel.
Depress
SET
to store new frequency.
NOTA BENE
Depress
Receiver operation remains unaffected.
The receiver is not set to the new parameters
unless the new data are stored!
ESC
to return to the previous level.
This key also serves to stop data entry in case
of errors.
EM 203, Publ. 10/94 engl
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CONTINUED FROM PAGE 21 / CH. 4.1.2
(RX)
DISPLAY
MANIPULATION
FUNCTION
The new frequency is stored in the memory.
The EM 1046 RX receiver module switches to
the new frequency selected.
Depress
Y
Y = YES !
For a short time the display indicates
to store data
or depress
The program returns to the selection mode.
N
N = NO !
or
Additional frequencies can be selected, if
need be. The program returns to the menu.
The display shows:
ESC
to stop storage.
NOTA BENE
Depress
ESC
to return to the previous level.
This key also serves to stop data entry in case
of errors.
EM 203, Publ. 10/94 engl
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Squelch
4.1.3
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose option „Squelch“ (see ch. 4.1.1)
Depress
SET
to allow the squelch threshold to be set.
UP
Use keys
The squelch threshold can be set in 140 steps.
The display indicates the level selected.
Y
DOWN
N
In addition, the left-hand LED bargraph
display indicates the squelch threshold:
to select the squelch threshold.
•
Keeping the key depressed accelerates
adjustment.
•
Use the RF scale (µV) to read off the
squelch threshold.
The squelch threshold can be additionally
checked on the monitor (monitor - see
ch. 4.1.8).
Depress
SET
Y
and subsequently:
Y = YES !
The new data are stored.
to store the squelch threshold
or
The display changes to „Menu“.
The program returns to the input routine.
N
depress
or:
N = NO !
New data can be selected, if need be. The
program returns to the menu. The display
shows:
ESC
to stop storage.
EM 203, Publ. 10/94 engl
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Selection
4.1.4
RF signal level/deviation/batery condition
DIVERSITY
MENU
Y
A
B
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose option "DEV", "RF" or "BAT" to
indicate the RF signal level, deviation or
battery condition.
It is useful to have permanent settings to
facilitate day-to-day applications. The LED
bargraph displays on the EM 1046 RX
receiver module can be set to four different
modes:
SET
Depress key
to allow selection.
Depress key
Y
DEVIATION/FIELDSTRENGTHOFTHEACTIVECHANNEL
FIELD STRENGTH OF CHANNELS A AND B (DIVERSITY)
N
to select the parameters to be indicated.
COMPARISON BETWEEN DEVIATION OF CHANNEL A
AND B (DIVERSITY)
TRANSMITTERBATTERYCONDITION/FIELDSTRENGTH
FOR FURTHER INFORMATION ON DATA INDICATED PLEASE REFER TO THE FOLLOWING PAGES!
After you have selected the data to be
indicated,
depress
SET
The new setting is stored.
and subsequently
Y
Y = YES !
The display changes to „Menu“.
N
N = NO !
or depress
or
The program returns to the original setting, e. g.
New data can be selected, if need be. The
program returns to the menu. The display
shows:
ESC
to stop storage.
EM 203, Publ. 10/94 engl
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DIVERSITY
MENU
Y
A
B
DEV.
RF.
N
SET
ESC
CONTINUED FROM PAGE 24, CH. 4.1.4
(RX)
DISPLAY
MANIPULATION
FUNCTION
DEVIATION/FIIELD STRENGTH
to be indicated:
Y
Use
or
N
to select the parameters to be indicated.
SET
Depress
and subsequently
to store the latest setting
or depress
Y
Y = YES !
N
N = NO !
to stop storage.
The left-hand bargraph display indicates
%
After having depressed
and
Y
150
DEV (= Deviation) in %
Peak Hold
100
ESC
DEV
µV
The right-hand bargraph display shows the
1000
field strength (RF= Radio Frequency) in µV
100
RF
EM 203, Publ. 10/94 engl
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DIVERSITY
MENU
Y
A
B
RFA
RFB
N
SET
ESC
CONTINUED FROM PAGE 25, CH. 4.1.4
(RX)
DISPLAY
MANIPULATION
FUNCTION
Use
or
Y
FIELD STRENGTH OF CHANNELS A/B (DIVERSITY)
to be indicated:
N
to select the parameters to be indicated.
SET
Depress
Y
Y = YES !
and subsequently
to store the latest setting
or depress
N
N = NO !
to stop storage.
The left-hand bargraph display indicates
µV
After having depressed
and
Y
1000
Field strength(RF = Radio Frequency) in µV
for diversity channel A
ESC
100
RF
NOTA BENE
µV
The right-hand bargraph display shows the
1000
100
This display allows to monitor the RF level of
both diversitiy channels and indicates possible
antenna problems.
field strength (RF = Radio Frequency) in µV
for diversity channel B
The scale in µV near the right-hand bargraph
display is to be used for both LED bargraph
displays.
RF
EM 203, Publ. 10/94 engl
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DIVERSITY
MENU
Y
A
B
DEV A
DEV B
N
SET
ESC
CONTINUED FROM PAGE 26, CH. 4.1.4
(RX)
DISPLAY
MANIPULATION
FUNCTION
Y
Use
DEVIATION CHANNELS A/B (DIVERSITY)
to be indicated:
N
or
to select the parameters to be indicated.
SET
Depress
Y
Y = YES !
and subsequently
to store the latest setting
or depress
N
N = NO !
to stop storage.
%
The left-hand bargraph display indicates
After having depressed
and
Y
150
DEV (= deviation) in %
for diversity channel A.
Peak Hold
100
ESC
DEV
%
The right-hand bargraph display shows the
150
100
DEV (= deviation) in %
for diversity channel B
Peak Hold
NOTA BENE
The read-outs of both bargraph displays differ
from each other only in case of faulty
functioning.
The scale in % near the left-hand bargraph
display is to be used for both LED bargraph
displays.
DEV
EM 203, Publ. 10/94 engl
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DIVERSITY
MENU
Y
A
B
N
SET
ESC
CONTINUED FROM PAGE 27, CH. 4.1.4
(RX)
DISPLAY
MANIPULATION
FUNCTION
Y
TRANSMITTERBATTERYCONDITION/FIELDSTRENGTH
to be indicated:
Use
N
or
to select the parameters to be indicated.
SET
Depress
Y
Y = YES !
and subsequently
to store the latest setting
or depress
N
N = NO !
to stop storage.
The left-hand bargraph display indicates the
After having depressed
%
Y
150
battery condition (bat = batterie) in %
and
ESC
100
In contrast to DEV and RF, the battery
condition is indicated by one LED only.
If the transmitter battery does not transfer
any data, the LED does not light up.
DEV
NOTA BENE
µV
1000
•
The display is only operative if SK 50 TV
or SK 250 TV transmitters are used!
100
•
After power-up of the transmitter, it will
take the display about 10 seconds to
indicate the battery condition.
The right-hand bargraph display shows the
field strength(RF= radio frequency) in µV
RF
EM 203, Publ. 10/94 engl
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Display
4.1.5
Text/frequency/battery condition
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose option "DispConf" (see ch. 4.1.1).
Depress
SET
The display can be set to two modes.
to allow the display to be set.
•
It indicates the receiver frequency of the
EM 1046 RX receiver module
(see ch. 4.1.2)
Use
UP
Y
or
•
DOWN
N
it indicates the text entered, e. g. the actors'
names who use the transmitters
(see ch. 4.1.6)
to select the parameters to be indicated.
Depress
SET
and subsequently
The new data are stored.
Y = YES !
Y
to store the latest setting
The display changes to "Menu".
or
The program returns to the input routine, i. e.
the receiver frequency
depress key
N
N = NO !
to stop storage.
or the text.
EM 203, Publ. 10/94 engl
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Entry of brief texts
4.1.6
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose the option to enter brief text
(ch. 4.1.1).
The display indicates the latest text entered.
Thefirst segment of the eight alphanumeric
segments starts blinking.
Depress
SET
to allow a brief text to be entered.
NOTA BENE
Y
Use
or
•
If you don't want to use all segments:
N
When "scrolling" the character set, you
will find a "blank segment" after the
exclamation mark.
to select the letters, numbers or special
characters to be indicated with each segment.
SET
Depress
to go to the next segment.
SET
Depress
and subsequently
Y = YES !
Y
The new data are stored.
to store the text
or
The display changes to "Menu".
N
N = NO !
The display indicates again
depress
to stop storage.
EM 203, Publ. 10/94 engl
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System configurations
and identification data
4.1.7
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose the option to set the display (ch. 4.1.1). The receiver specifications are stored in every
single module:
The display indicates the
SET
Depress
MODEL/SERIES
to return to the display mode.
•
EM 1046-U-L
UHF ( 450 - 790 MHz)
•
EM 1046-U-H
UHF ( 630 - 960 MHz)
Y
Use
SERIAL NUMBER OF THE MODULE
Every module has a serial number to facilitate
its identification. The serial number cannot be
changed.
N
or
to select the parameter to be indicated.
Scrolling is stopped by keeping
FREQUENCY RANGE OF THE MODULE
The display shows the standard frequencies or
frequency ranges.
SET
SOFTWARE VERSION
depressed.
Shows the version of the software used.
HARDWARE VERSION OF THE MODULE
1
Version of the analog section
(information for Sennheiser's Service
Department or Sennheiser distributors)
NOTA BENE
2
Version of the digital section
(information for Sennheiser's Service
Department or Sennheiser distributors)
Depress
ESC
CUSTOMER-SPECIFIC TEXT
to return to the previous level.
This key also serves to stop data entry in case
of errors.
It is entered by Sennheiser electronic KG or
your Sennheiser distributor, if ordered.
EM 203, Publ. 10/94 engl
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Remote monitoring of
transmitter battery
4.1.7
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
Choose the option to indicate the condition of
the transmitter battery (see ch. 4.1.1).
The EM 1046 RX receiver module
distinguishes between two types of power
supply: the transmitters can be powered by
batteries or rechargeable batteries.
Depress
SET
If primary cells are used, the display indicates
the remaining capacity in three steps. A 5-step
display is used for rechargeable batteries.
to select the display mode for the indication of
the battery condition.
NOTA BENE
This function is only operative if SK 50 UHF,
SK 250 UHF or SKM 5000 UHF transmitters
are used.
If you connect transmitters other than SK 50
UHF, SK 250 UHF or SKM 5000 UHF, the
display indicates
CONDITION OF PRIMARY CELLS:
Depress
ESC
Capacity of 100 %
to return to the previous level.
Capacity of about 70 %
This key also serves to stop data entry in case
of errors.
Capacity of about 30 %, the display starts
blinking.
Attention !
Replace the transmitter batteries.
The remaining capacity only suffices for
about half an hour!
EM 203, Publ. 10/94 engl
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CONTINTUED FROM PAGE 32, CH. 4.1.8
(RX)
DISPLAY
MANIPULATION
FUNCTION
CAPACITY OF RECHARGEABLE BATTERIES:
Capacity of 100 %
Capacity of about 80 %
Capacity of about 60 %
Capacity of about 40 %
Capacity of about 20 %, the display starts
blinking.
NOTA BENE
Attention !
Use the luminous band for permanent
monitoring of transmitter batteries
(see ch. 4.1.4).
Replace the battery pack. The remaining
capacity only suffices for about half an hour!
Recommendation:
Replace the battery pack after about 15
minutes to maintain 100 % reliability.
If the remaining operating time falls below half
an hour (during normal operation), the EM
203 receiver display indicates "Low Batt!" at
short intervals.
EM 203, Publ. 10/94 engl
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Monitoring of audio signals
4.1.8
DIVERSITY
MENU
A
B
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
It is only possible to monitor the active
channel, i. e. one channel at a time.
Depress
The LED on the monitor key lights up if the
key is depressed, i. e. monitoring is possible.
to monitor the audio signal via headphones
connected to the mainframe.
Depress
once again to stop monitoring.
EM 203, Publ. 10/94 engl
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Stand-by
4.1.9
DIVERSITY
MENU
A
B
Y
N
SET
ESC
(RX)
DISPLAY
MANIPULATION
FUNCTION
In some situations it is useful not only to
mute the audio signal at the mixing console
but also to switch off the complete RF section
of the EM 1046 receiver module.
Two reasons of several possible are:
•
•
the wish to have only active channels
indicated or
the need of fault finding in case of RF
interference.interference
The receiver offers two options:
Depress the stand-by
key
Y = yes, switch off receiver
and choose
or
N = no, return to normal operation
Y
N
If the receiver has been switched off, the
display indicates for about 2 seconds
and subsequently goes out, except for a small
luninous spot.
Depress the stand-by
key once again to put
the unit to work
Y = yes, return to normal operation. The
module is switched on as previously
described (see ch. 3.5.)
N = no, the module is to remain in the off-
state.
Y
and choose
N
NOTA BENE
Depressing the menu keys during stand-by
operation results in the indication of the
receiver frequency selected (see ch. 4.1.2).
The monitor key remains active!
EM 203, Publ. 10/94 engl
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Monitor
4.2
LED indicators
4.2.1
4.2.2
Monitor headphones
OPERATING ELEMENTS
ON/OFF SWITCH
POWER INDICATORS
BOOSTER INDICATORS
(INCL. OVERLOAD)
REMOTE SWITCH
(REMOTE CONTROL)
WITHOUT FUNCTION!
20 dB GAIN
FOR MONITORING
MONITOR
MONITORING VOLUME
HEADPHONES
(STEREO, 6,3 mm Ø
MIN. IMPED. 50 Ω)
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LED indicators
4.2.1
POWER
+ 12 V
- 12 V
+ 5 V
DC - A
DC - B
OL - A
OL- B
REMOTE
+ 20
dB
+ 20 dBu
LED DISPLAY
FUNCTION
The three upper LEDs light up if the in-built
power supply unit operates perfectly
+ 12 V supply voltage = 12 V
- 12 V supply voltage = -12 V
+ 5 V supply voltage = 5 V
If one LED switches off, please replace the
complete power module and return it for fault
finding.
'The other four LEDs serve to monitor the
antenna boosters connected (e.g. AB 1036 TV):
DC-A The switch on input module A is set to ON. The
antenna booster is powered by the EM 1046
system
DC-B The switch on input module B is set to ON. The
antenna booster is powered by the EM 1046
system
OL-A (Overload) The current across antenna socket A
exceeds 150 mA! Short circuit! Check your
antenna booster.
OL-B (Overload) The current across antenna socket B
exceeds 150 mA! Short circuit! Check your
antenna booster.
EM 203, Publ. 10/94 engl
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Monitor headphones
4.2.2
POWER
+ 12 V
- 12 V
+ 5 V
DC - A
DC - B
OL - A
OL- B
REMOTE
+ 20
dB
+ 20 dBu
FUNCTION
The monitor socket is suited to connect mono
or stereo headphones with an impedance of
about 50 to 300 Ω.
The rotary switch serves to adjust the volume.
The "+ 20 dB" switch increases the signal level
at the monitor socket by 20 dB. This facilitates
the identification of residual noise.
NOTA BENE
The max. output level at the monitor socket
amounts to + 18 dBm.
Check the setting if audible distortions occur.
EM 203, Publ. 10/94 engl
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Technical data
5
Frequency range
450 - 790 MHz with RX module item no. 03246
760 - 960 MHz with RX module item no. 03247
Bandwidth
24 MHz
Channel spacing, min.
300 kHz
Channel grid, min.
5 kHz
1st oscillator frequency (1st LO)
1st intermediate frequency (1st IF)
2nd oscillator frequency (2nd LO)
2nd intermediate frequency (2nd IF)
Deemphasis
71 MHz below / above Fe
71 MHz
81.7 MHz
10.7 MHz
50 µs
Nominal deviation/Peak deviation
± 40 kHz / ± 56 kHz
AF outputs
3 x XLR connectors with a balanced AF output signal,
min. load impedance 600 Ω
Nominal audio level
Peak audio level
+ 12 dBm
+ 18 dBm
THD for peak deviation
≤ 1 % (typ. < 0,5 %)
Audio frequency range (+1 dB / -2 dB) 40 Hz - 20 kHz
Compander
Diversity
Squelch
HIDYN plus® ( internally defeatable)
RF signal-dependent selection of AF outputs
adjustable threshold (0-100 µV RF input voltage)
S/N = 52 dB (unweighted, with HIDYN plus®)≤ 1.5 µV (typ. 1 µV)
S/N max. (peak deviation, with HIDYN plus®) ≥ 112 dBA eff. / ≥ 100 dB CCIR peak
Limiter threshold
≤ 1 µV *
≥ 76 dB
≥ 66 dB
Intermodulation attenuation
Rejection of adjacent channels
Suppression of spurious and harmonics ≥ 100 dB *
Blocking
≥ 85 dB *
Image rejection
Spurious emissions (RF)
≥ 100 dB *
≤ - 80 dBm at HF - input
RF inputs
Monitor socket
2 x N - sockets
6.3 mm-ø jack, max. +18 dBu / 600 Ω,
short-circuit proof, min. load imp. 50 Ω,
gain: +20 dB (adjustable) and +20 dB (switchable)
Indicators
Monitor:
3 LEDs for operating voltages
2 LEDs for booster supply voltage
2 LEDs for booster overload
1 LED for remote operation
RF input:
2 LEDs for booster supply voltage
RX modules:
8 digit alphanumeric LED display
(text or frequency)
2 diversity LEDs,
1 monitor LED,
2 x 16 digit LED bargraph display
for dev. and RF IN
Operating elements
Monitor:
mains switch, remote switch
+20 dB switch,
+20 dB regulator
RX modules:
RI module:
6 keys
2 switches for booster voltage
2 NF-PAD, 20 dB attenuation
Booster supply voltage
Supply voltage
Power consumption
Mains connection
Housing
Dimensions
Weight
Approval number (Germany)
2 x 12 V, max. 150 mA, current limiter, switchable
12 - 16 V / 3 A DC, protective low voltage
max. 30 W
4-pin XLR, for plug-in PSU (different for each country)
19" rack, 4 height units, 34 BE
approx. 200 mm x 360 mm x 190 mm
approx. 7 kg (incl. all modules)
A 102 932C RF (BZT
* with AB 1036 antenna booster connected in series.
GZA 1036 antenna recommended.
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SENNHEISER ELECTRONIC KG
30900 Wedemark
Subject to alterations. Errors and omissions excepted!
Publ.: 10/94
51104
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