Cat. No. 19-1104
OWNER’S MANUAL
Please read before using this equipment.
HTX-400
Mini Handheld 70-Centimeter FM
Amateur Transceiver
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Paging Tones— you can set the radio to play a short, selectable
paging tone when it transmits, and sound the same tone when it
receives a signal.
Signal Strength Indicator — a graduated bar shows the relative
strength of the received signal.
Time-Out Timer — lets you set a maximum transmission time in-
terval from 0 to 161/2 minutes in 10-second increments.
Busy Channel Lock Out — prevents transmitting while the se-
lected channel is receiving a signal.
TX Delay — reduces squelch tail when communicating using
CTCSS.
Scan Delay — delays the restart of scanning when the radio
locks onto a channel.
Earphone Jack and External Microphone Jack — let you con-
nect an optional earphone, external microphone, or combination
headset, for more flexible operation.
External Power Jack — lets you use an external power source
for maximum output.
30 Memory Locations — let you store up to 30 frequencies and
other settings.
Back Light — makes your transceiver easy to operate in low-
light situations.
Key Lock — lets you lock the transceiver’s keys to prevent acci-
dentally changing settings.
We recommend you record your transceiver’s serial number
here. The number is on the transceiver’s back panel.
Serial Number ____________________________
3
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MANUAL CONVENTIONS
Your transceiver’s buttons perform multiple functions. The abbre-
viation or symbol for a function is printed on, below, or above
each button.
To activate certain transceiver features, you must press FUNC
(function) and another button at the same time. Those key com-
bination instructions are printed as the first button name, +, then
the second button name. For example, FUNC+LOCK means
hold down FUNC while you press LOCK.
Button names are printed in small, bold, capital letters such as
BEEP or SC. Words, symbols, and numbers that appear on the
display are printed using a distinctive typeface, such as
446.100 or BUSY
.
FCC INFORMATION
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause un-
desired operation.
4
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CONTENTS
Introduction to Amateur Radio ............................................. 7
Preparation ............................................................................. 9
Power Sources .................................................................. 9
Using Internal Batteries ............................................. 9
Testing Internal Batteries ......................................... 10
Using AC Power .............................................................. 11
Using Ni-Cd or Ni-MH Battery Power .............................. 11
Using Vehicle Battery Power ........................................... 12
Connecting the Antenna ................................................. 13
Attaching the Belt Clip .................................................... 13
Attaching the Wrist Strap ................................................ 14
Connecting a Microphone/Speaker ................................. 14
Using the Menus .................................................................. 16
Using the HTX-400’s Menus ........................................... 16
A Quick Look at the Controls .............................................. 19
A Quick Look at the Display ................................................ 22
Operation .............................................................................. 23
Turning on the HTX-400 .................................................. 23
Selecting Frequencies (Direct Tuning) ............................ 23
Receiving Transmissions ................................................. 24
Temporarily Opening Squelch ......................................... 24
Transmitting ..................................................................... 25
Understanding Repeaters ................................................... 26
Setting the Repeater Offset Frequency .......................... 27
Turning Duplex Operation On and Off ............................. 27
Setting the Repeater Offset Direction ............................. 28
Reversing the Transmit and Receive Frequencies .......... 28
Memory Operation ............................................................... 29
Storing a Transmit/Receive Frequency ........................... 29
Recalling Memories ........................................................ 30
Clearing A Single Memory .............................................. 30
Using the Calling-Frequency Memory ............................. 31
5
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Scanning Operation ............................................................. 32
Scanning for Active Frequencies ..................................... 32
Using Scan Delay ..................................................... 32
Scanning Standard Memory Locations ........................... 32
Setting A Memory Location to Always Skip
During Scanning ...................................................... 33
Temporarily Locking Out (Skipping) Locations
During Memory Scanning ........................................ 34
Continuous Tone Coded Squelch System Features ......... 35
Tone Paging ..................................................................... 37
Sending Paging Tones ..................................................... 37
Other Special features ......................................................... 38
Changing the Transmit Frequency Range ....................... 38
Locking the Keypad ......................................................... 38
Lighting the Display ......................................................... 38
Turning the Key Tone On and Off .................................... 39
Checking the Current Memory Settings .......................... 39
Setting the Frequency Step ............................................. 39
Power Save ..................................................................... 40
Time-Out Timer ............................................................... 40
Reducing Squelch Tail ..................................................... 41
Busy Channel Lockout .................................................... 41
Troubleshooting .................................................................... 42
Care and Maintenance ......................................................... 43
Using the Keypad Diagnostic .......................................... 44
Resetting the HTX-400 .................................................... 44
Specifications ....................................................................... 45
6
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INTRODUCTION TO AMATEUR RADIO
Your transceiver is the perfect first radio for anyone entering the
exciting world of amateur radio, as well as a great additional
transceiver for the experienced amateur radio operator. Your
transceiver opens a door for you to the world from almost any-
where! All you need is an Amateur Radio Operator’s License
(Technician Class or higher) issued by the Federal Communica-
tions Commission (FCC). If you do not have a license, it is easier
than ever to get one, and help from licensed operators is avail-
able. Here are a few tips to help you get started.
You can turn on your transceiver and scan the entire band to hear
what is going on; however, do not attempt to transmit until
you get your license. If you transmit without a license, you are
in violation of federal law that can lead to severe penalties. Note
that ham operators take the FCC rules very seriously and want
nothing to do with “bootleggers” — their term for people who op-
erate without a license.
Find out if there is a ham radio club in your area. Most clubs wel-
come newcomers and are glad to help you get your license.
There are thousands of clubs across the country, so there is prob-
ably one in or near your community. The staff at your local Ra-
dioShack store often can help you locate a club.
If you do not hear anyone talking about a local club as you listen
to local transmissions, write to the American Radio Relay League
(ARRL) at the following address to find out how to contact a local
affiliate. The ARRL is the national organization representing am-
ateur radio in the United States. The league has more than
150,000 members. Most are ham operators, or members in the
process of obtaining their license.
The American Radio Relay League
225 Main Street
Newington, CT 06111
7
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Start studying for the license exams. Do not be intimidated by the
word “study,” because most people can go from knowing abso-
lutely nothing about amateur radio to passing the Novice and
Technician written exams in less than a month.
The exams test your knowledge of basic radio regulations and el-
ementary radio theory. Many clubs hold license classes which
can be a fun and easy way to learn about amateur radio. There
are good books, cassette tapes, computer programs, and many
FCC
other study aids available. Your local RadioShack store sells
License Preparation
study guides for amateur radio operator li-
censes. While you are no longer required to learn Morse code for
a Technician Class license, we encourage you to learn it anyway
so you can advance to higher levels of operating privileges.
There is no fee to take the Novice exam. As soon as you pass the
Novice exam, you can immediately take the Technician exam.
There is a small fee required for taking the Technician exam. All
license level tests are administered by a three-member Volunteer
Examiner Team. Contact the ARRL for a schedule of exam op-
portunities in your area.
The Technician Class license lets you use the HTX-400 to com-
municate directly with other operators, and use repeaters for dis-
tant communication.
Amateur radio is a great hobby that has enriched the lives of mil-
lions of people all over the world. The ARRL would be glad to hear
from you if you need more information or would like to join!
8
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PREPARATION
POWER SOURCES
You can operate your transceiver from any of three power sourc-
es:
• internal batteries
• AC power (using an optional power supply and DC adapter)
• vehicle battery power (using an optional DC adapter)
Using Internal Batteries
Your transceiver can use two AA batteries (not supplied) for pow-
er. For the best performance and longest life, we recommend Ra-
dioShack alkaline batteries.
Cautions:
• Use only fresh batteries of the required size and recom-
mended type.
• Do not mix old and new batteries, different types of batteries
(standard, alkaline, or rechargeable), or rechargeable bat-
teries of different capacities.
Follow these steps to install batteries.
LOCK Tab (on bottom)
1. Move the LOCK tab in the opposite direction of the arrow
marked on the bottom of the transceiver.
9
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2. Press down and slide the battery compartment cover in the
direction of the arrow marked on the cover.
3. Put the batteries into the compartment and on top of the
attached ribbon, according to the polarity symbols (+ and –)
marked inside the compartment.
4. Replace the cover and slide the
cover.
tab to secure the
LOCK
Testing Internal Batteries
BAT
When you turn on the HTX-400,
uated bar (the signal strentgth meter) next to
battery strength. If the batteries are weak, the graduated bar
shows less than 4 boxes. The battery symbol ( ) constantly in-
appears briefly and the grad-
BAT
indicates the
dicates the battery strength. When only one or two bars appear
inside the battery strength indicator, replace both batteries as
soon as possible.
Warning: Dispose of old batteries promptly and properly. Do not
burn or bury them.
Caution: If you do not plan to use the transceiver with batteries
for a two week period, remove the batteries. Batteries can leak
chemicals that can destroy electronic parts.
10
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USING AC POWER
You can operate the HTX-400 from AC power using a regulated
power supply capable of supplying 13.8 VDC at least 1A and a
vehicle power adapter (see “Using Vehicle Battery Power” on
Page 12). The supply should also have an accessory power
socket into which the DC-to-DC power adapter fits. If your power
supply does not have an accessory power socket, you can either
wire the power cord directly to your power supply or add an ac-
cessory power socket to the supply. Suitable connectors, power
supplies, power cords, and sockets are available at your local
RadioShack store.
The following illustration shows how to connect a typical power
supply, a DC-to-DC power adapter, and the HTX-400.
USING NI-CD OR NI-MH BATTERY
POWER
You can use either Ni-Cd or Ni-MH batteries to power your HTX-
400; however, you cannot recharge these batteries while they are
inside the HTX-400. You can use a separate external charger for
recharging the batteries outside the radio. Your local RadioShack
store carries a selection of suitable batteries and chargers.
Note: As these batteries provide less voltage than that typically
supplied by alkaline batteries, expect less transmitting output
power when you use the HTX-400 with Ni-Cd or Ni-MH battery
power.
11
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USING VEHICLE BATTERY POWER
You can power the HTX-400 from a vehicle’s 12V power source
(such as cigarette-lighter socket) using an 9-volt, 900 mA DC-to-
DC power adapter and a size I Adaptaplug® (neither supplied)
with TIP set to +. Both are available at your local RadioShack
store.
Cautions:
You must use a power source that supplies 9V DC
and delivers at least 900 mA. Its center tip must
!
be set to positive and its plug must fit the HTX-
400's DC 9V jack. Using an adapter that does not meet
these specifications could damage the HTX-400 or the
adapter.
• Always connect the DC adapter to the HTX-400 before you
connect it to the power source. When you finish, disconnect
the adapter from the power source before you disconnect it
from the HTX-400.
Follow these steps to operate the HTX-400 from a vehicle’s bat-
tery power.
1. Insert the Adaptaplug into the HTX-400’s DC 9V jack.
2. Plug the other end of the adapter into the cigarette-lighter
socket in the vehicle.
12
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CONNECTING THE ANTENNA
Place the threaded base socket of the supplied antenna over the
antenna connector on top of the transceiver and turn the antenna
. Turn it clockwise to remove it.
clockwise to tighten it
U
Caution: Do not over-tighten the antenna
Note: You can connect an external antenna to the HTX-400 using
an SMA-to-PL-259 adapter. This adapter, as well as suitable an-
tennas, are available through your local RadioShack store.
ATTACHING THE BELT CLIP
Use a Phillips screwdriver and the two supplied screws to attach
the supplied belt clip to your transceiver. Do not overtighten the
screws.
13
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ATTACHING THE WRIST STRAP
To attach the supplied wrist strap to the top of the belt clip, thread
the strap’s small loop through the opening in the top of the clip.
Then insert the longer loop through the smaller loop and pull on
the strap until the loop is tight.
CONNECTING A MICROPHONE/
SPEAKER
You can connect an external communications headset (con-
sisting of a microphone and speaker) to the transceiver so you
can use it privately. Lift the hinged, rubber dust cover from the
MIC and SPK jacks on the top of the transceiver, then insert
the plug of an optional voice activated headset with micro-
phone, or an optional communication headset, into the jacks.
14
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Caution: Use only microphone and speaker accessories that do
not share a common ground for the speaker and the microphone.
Doing otherwise might damage the transceiver.
Note: Inserting a headset’s plug automatically disconnects the in-
ternal speaker.
You can also connect an optional mono earphone to the SPK
jack. This lets you use the transceiver’s push-to-talk button to
transmit as usual. Your local RadioShack store carries a wide se-
lection of suitable communications headsets, earphones, and
separate components.
The following schematic diagram shows the typical wiring for a
suitable external mic and speaker.
External Speaker
Speaker-
Plug
Barrel
–
+
Tip
External Microphone
MIC Plug
Barrel
Ω
22k
–
+
Tip
PTT
15
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USING THE MENUS
USING THE HTX-400’S MENUS
The HTX-400 provides two menus to access its features, the
Main Menu and the Tone Set Menu. To see details about each
operation, refer to the page number in the following chart.
To access the Main Menu, hold down FUNC while turning on the
HTX-400. (The CS option appears). Hold down
then re-
FUNC
peatedly press Wor V to step through the other options. Release
and press V or W to change an option’s setting.
FUNC
Setting
Main Menu
Options
( ) = default
setting
Description
Page
CS
Frequency
Step
.0050
.0100
(.0125) .0150
(MHz),
,
,
Sets the increment
for scanning the
band.
39
,
.0200 .0250
,
,
.0500 1.000
,
bCLO
Busy Chan-
nel Lockout
(Off)
On
Prevents transmit-
ting while receiving
a signal.
41
41
32
t.dY
Transmit
Delay Time
Off
(On)
Prevents
squelch tail.
Sd
1 to 30 seconds
(5)
Sets the scanning
restart time.
Scan Delay
Time
16
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Setting
( ) = default
setting
Main Menu
Options
Description
Page
tot
(Off)
Limits transmit time.
40
Time out
Timer
On 10-990 seconds
PS
(Off)
On
Cycles power
40
PS
flashes) to the
Power Save
(
receiver section to
conserve batteries.
The circuit remains
off then turns on
briefly to check for
an incoming signal.
r
0.00 8.00
MHz
in 50kHz steps.
(5.00)
–
Sets the offset in 50
kHz steps between
the repeater’s trans-
mit and receive fre-
quencies.
27
Repeater
Offset
17
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The Tone Set Menu lets you set features that relate to sound and
the CTCSS tones. To access these settings, turn on the HTX-400
then
FUNC
T.SET
and press . (The tone option ap-
hold down
FUNC
V
W
V
W
pears.) Press
+
or to select the option, then or to
change the setting.
Tone Set
Setting
Option
( ) = default setting
Description
Page
tone
Subaudible
Tone
(Off)
On
Lets the HTX-400
transmit and
receive the Sub-
audible Tone
35
(CTCSS) fre-
quencies so you
can listen only to
other units with
the same tone.
rC
Receive
Tone
See the table
on Page 36.
(67.0)
Lets you select
one of 47 different
receiving sub-
35
audible tones or
turn the feature
off
.
tC
See the table
on Page 36.
(67.0)
Lets you select
one of 47
different subaudi-
ble tones or turn
35
37
Transmit
Tone
the feature off
.
MEL
Tone Paging
(1), 2, 3, 4, 5
Lets you select a
tone to receive or
transmit.
18
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A QUICK LOOK AT THE CONTROLS
Most of the controls of the HTX-400 have multiple functions. Use
the following chart to review the function of each control.
VOL/OFF
Microphone
SQ
PTT
U
Speaker
Use with the
Key/Control
VOL/OFF
Use it to:
FUNC + Key to:
Turn the radio on/off.
Adjust the volume.
Access the Main
Menu.
SQ
Set the squelch level
to block weak signals.
N/A
(
)
Change (increase) the
frequency by the value
set for CS (see the first
menu option on Page
16).
Directly changes
the frequency, one
digit at a time.
Repeatedly press
V to access each
digit of the dis-
played frequency.
19
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Use with the
Key/Control
(T.SET)
Use it to:
FUNC + Key to:
Change (decrease)
the
frequency by the value
set for CS (see the first
menu option on Page
16).
Accesses the Tone
Set Option menu
and settings.
MO (REV)
Press to override
Reverse the
squelch. Press and
hold to cycle through
repeater offset.
rC tC r
CS
set-
,
,
, and
tings.
Turn on the display’s
backlight for 4 sec-
onds.
Enable/disable the
key tone.
appears when the
key tone is enabled.
(BEEP)
MR (MW)
Enter memory setting
mode. MRand the last
used memory location
appear.
In memory mode,
starts the display
flashing. Then use
or
to
access a frequency
to store in a mem-
ory location.
SC (RPT)
Starts and stops scan-
ning. Hold down and
power on to access
expanded band cover-
age
Set the radio to
simplex or duplex
mode when in VCO
mode. Set the
repeater offset for a
memory location
when in memory
mode.
(420–450 MHz).
20
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Use with the
Key/Control
C (LOCK)
Use it to:
FUNC + Key to:
Press once to display
and switch to the cur-
rent call frequency.
Hold down to change
the call frequency and
associated parame-
ters, such as repeater
offset and CTCSS
tones.
Lock the control
(except PTT, MO,
, VOL, and SQ).
Press again to
unlock the controls.
PTT
(Push To Talk)
Hold down to trans-
mit. Press to store the
settings.
Swap the input and
output frequencies
for repeater opera-
tions.
21
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A QUICK LOOK AT THE DISPLAY
17
16
15 14 13 12
1
2
3
4
5
6
7
8
9 10 11
1. F: appears when the FUNC key is pressed.
2. TX: appears when the radio is transmitting.
3. BUSY: appears when the radio receives a signal.
4. CALL: appears when tone squelch is on and the radio receives a
matching tone.
5.
: indicates the battery strength.
6. S-RF (Signal/RF Indicator): shows the level of an incoming signal.
When transmitting, shows the relative output signal strength.
7. BAT: appears when you turn on the radio — the signal strength
meter then indicates the battery strength.
8.
: the stronger the signal, the more boxes appear.
Bars show remaining battery power when MO and PTT switch are
held down at the same time.
9. Alpha-Numeric Display: shows frequency and messages.
10. Memory Location: shows the memory channel in use.
11. MR (Memory Channel indicator): for use or for programming.
12.
13.
14.
: paging tone active.
: key tone enabled.
: keypad control disabled to prevent accidentally
changing a setting.
15. PS: appears when power save is enabled.
16. TSQ: appears when Tone Squelch (CTCSS) is enabled.
ã
17. : appears to indicate a positive repeater offset. – indicates a nega-
tive repeater offset.
22
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OPERATION
TURNING ON THE HTX-400
To turn on the HTX-400, rotate
clockwise until it clicks.
VOL/OFF
The HTX-400 sounds a brief melody if the key tone feature is en-
abled. Then HELLOappears for about 2 seconds and the last
used frequency appears.
SELECTING FREQUENCIES
(DIRECT TUNING)
You tune to the desired frequencies in the VFO (variable frequen-
cy oscillator) mode. You can either step to a specific frequency or
directly select the frequency.
To step to a frequency, repeatedly press or hold down
until the display shows the desired frequency.
or
Note: The HTX-400 steps up or down in increments which you
set using the Frequency Step menu option. (See “Setting the Fre-
quency Step” on Page 39).
To directly enter a frequency, press FUNC+ (the second digit
from the left flashes), then press
or
to change the number.
Press FUNC+ again to select the next digit. Repeat this to select
each number of the desired frequency, then press PTT to store
the selection.
Note: The HTX-400 is preset to receive frequencies between 420
and 470 MHz, and transmit between 430 and 450 MHz. To ex-
pand the frequency coverage, see “Changing the Transmit Fre-
quency Range” on Page 38.
23
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RECEIVING TRANSMISSIONS
Follow these steps to receive standard transmissions.
1. With the radio on, rotate
counterclockwise until you hear
SQ
a hissing sound. Then slowly rotate SQ clockwise just until
the noise stops.
Notes:
• BUSY appears when the HTX-400 receives a standard
transmission or if the squelch is open. If the transmission
uses CTCSS tones, CALLalso appears.
• Volume, power, and squelch are combined in one control.
The inner control is VOL (volume) and power on/off, while
the outer control is SQ (squelch).
• If the HTX-400 picks up unwanted, weak transmissions,
rotate SQ clockwise to prevent the squelch from opening
for these transmissions. If you want to hear weak trans-
missions, rotate SQ counterclockwise. When you do this,
you might hear hissing between transmissions.
2. Set VOL/OFF to a comfortable listening level.
TEMPORARILY OPENING SQUELCH
If you use the Tone Squelch (CTCSS) feature, you might not hear
a trans
o temporarily open the
mission on the current frequency. T
squelch so you can hear all transmissions on the frequency, hold
down MO. To resume normal operation, release MO.
24
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TRANSMITTING
There are two basic types of communication possible with this
transceiver: radio-direct-to-radio (simplex) or radio-to repeater-to
radio (duplex). Simplex operation uses the same frequency to
send and receive. Duplex operation uses one frequency to trans-
mit and another to receive. For more information about duplex,
see “Understanding Repeaters” on Page 26.
Caution: It is illegal to transmit if you do not have at least a Tech-
nician Class license issued by the FCC.
Follow these steps to transmit.
1. Select the desired frequency using manual or direct entry.
2. Hold the HTX-400 about 3 inches from your mouth.
3. Hold down PTT, then speak slowly and clearly into the micro-
phone. TXappears while you transmit.
Note: If you try to transmit outside the transmit frequency
range, inhibitbriefly appears.
4. Release PTT when you finish transmitting.
25
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UNDERSTANDING REPEATERS
Operation through a repeater, where you transmit on one fre-
duplex
quency and receive on another, is called
ation direct to another station, where you transmit and receive on
simplex
operation. Oper-
the same frequency, is called
operation.
A repeater is a station that receives a signal on one frequency
input
(the
frequency) and then retransmits that signal on a differ-
output
ent frequency (the
frequency). Repeater antennas are typ-
ically located at the tops of tall buildings or on antenna towers, so
a relatively low-power signal can reach the repeater. The repeat-
er retransmits the signal at a higher power. This gives your trans-
ceiver the ability to communicate over a much greater range.
To use a repeater, you must know the repeater’s input and output
frequencies. Repeaters are usually identified by their output fre-
quency. Thus, a repeater that has an output frequency of 442.200
is referred to as “the 442.2 repeater.” To determine the input fre-
offset
offset direction
quency, you must know the frequency
the 70 cm-meter band) and the
(typically 5 MHz for
(+ if you add 5
MHz to the output, or – if you subtract 5 MHz from the output).
Whether the offset is positive or negative depends on:
• which part of the band the repeater operates on
• local convention
• proximity of repeaters using the same two frequencies
The
To determine the offset and the direction, obtain a copy of
ARRL Repeater Handbook
(available from your local Ra-
dioShack store or directly from the ARRL) which lists the loca-
tions of repeaters as well as their frequency and offset
information.
A
above the displayed frequency indicates a positive offset,
+
while a – above the frequency indicates a negative offset. If nei-
ther
or – appears, the HTX-400 is set for simplex operation.
n
+
26
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SETTING THE REPEATER OFFSET
FREQUENCY
The HTX-400’s default repeater offset is 5 MHz, which appears
as 5.00
). Follow these steps to change the offset.
(MHz
Note: This setting only affects the VFO mode. If you saved a fre-
quency offset in a memory, that setting is not affected.
1. With power off, hold down FUNC and turn on the HTX-400,
2. Hold down FUNC and repeatedly press
until r and
the
appear. 5.00appears if no offset is currently
current offset
set.
3. Repeatedly press
or
until the desired offset appears.
You can set an offset between 0 and 8 MHz in 50kHz steps.
4. Press PTT to store the setting and exit the menu.
TURNING DUPLEX
OPERATION ON AND OFF
To turn on duplex (repeater use) operation for the VFO mode,
press FUNC + SC (RPT). Provided the current repeater offset val-
ue is not 0.00, the current offset indicator (+above or –below)
appears above the displayed frequency. Press FUNC + SC (RPT)
again to turn it off.
27
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SETTING THE REPEATER OFFSET
DIRECTION
1. Set an offset frequency other than 0.00.
2. Press FUNC + SC (RPT) to see the current offset direction (+
above or –below).
3. Press FUNC + MO (REV) to change the repeater offset direc-
tion.
MR
Note: To save this setting in a memory location,
must be
flashing before you store the settings (see “Using the Calling-Fre-
quency Memory” on Page 31 and “Storing a Transmit/Receive
Frequency” on Page 29). Otherwise, the setting reverts to its
saved value the next time you turn on the HTX-400.
REVERSING THE TRANSMIT AND
RECEIVE FREQUENCIES
To swap the input and output frequencies, press
. For
FUNC+PTT
example, if you have set the radio to repeater operation on
442.200 with a positive offset of 5 MHz, the radio would normally
receive on 442.200 and transmit on 447.200 MHz. After you
press FUNC+PTT, the radio will receive on 447.200 and transmit
on 442.200.
This feature is useful if you want to determine whether you are
close enough to another station to communicate on a simplex fre-
quency. While the other station is transmitting, reverse the fre-
quencies. If you can still hear the other station, you are hearing
their signal directly and you do not need to use the repeater.
28
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MEMORY OPERATION
Your HTX-400 has 30 standard memory locations that you can
use to store frequencies for quick access. For each memory loca-
tion, you can also store other settings such as the repeater offset,
CTCSS tones, and frequencies to pass or lock out during scan-
ning.
STORING A TRANSMIT/RECEIVE
FREQUENCY
MR
1. Press MR.
and the last used memory location appear.
or to select the desired memory
2. Repeatedly press
location. ------ appears if the memory location is empty.
MR
. The selected memory location and
FUNC MR
3. Press
flash.
+
4. Select the desired frequency by repeatedly pressing
or , or use direct frequency entry to select a frequency.
5. To enter a frequency offset for repeater operation, press
+
. The HTX-400 displays the current offset for the
FUNC SC
calling frequency. Then press
or
to select the desired
offset. Press PTT to store your setting.
6. Press FUNC + REV to select the offset direction (+ or –). To
remove an offset for simplex operation, set the repeater off-
set to 0.00.
7. If desired, set the tone squelch settings (see “Continuous
Tone Coded Squelch System Features” on Page 35).
8. Press
to store all settings, then press
PTT
MR
to exit the
memory mode.
29
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RECALLING MEMORIES
MR
appears. Then
To recall saved memory settings, press
so
MR
press
or
to select the desired memory location.
Press
again to return to the VFO mode, (See “Selecting Fre-
MR
quencies (Direct Tuning)” on Page 23.)
CLEARING A SINGLE MEMORY
Follow these steps to clear any single memory location.
MR
and the last used memory location appear.
1. Press
.
MR
2. Repeatedly press
location.
or
to select the desired memory
MR
. The selected memory location and
FUNC MR
3. Press
flash.
+
4. Hold down FUNC for several seconds. The memory location
clears and ------ appears to confirm that the location is
empty.
5. Press MR to exit the memory mode.
Note: To clear all memory locations, see “Resetting the HTX-
400” on Page 44.
30
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USING THE CALLING-FREQUENCY
MEMORY
The calling-frequency memory location lets you quickly jump to
a specific frequency at any time. The default calling frequency
is 446.0000 MHz. You can store a different frequency into mem-
ory as well as other settings associated with that frequency,
such as the repeater offset and CTCSS tone.
1. Press C to display the current calling frequency.
MR
2. To change the frequency, hold down C until
and C
flash.
3. Select a frequency. See “Selecting Frequencies (Direct
Tuning)” on Page 23.
4. Press to store the selected frequency in memory.
C
5. To enter a frequency offset for repeater operation, press
. The HTX-400 displays the current offset for the
FUNC+SC
calling frequency. To select a new offset value, press
or
. Select 0.00 Hz if you want to remove the offset. To
store the setting, press PTT.
6. To select the offset direction (+ or –), press
To
FUNC + REV.
remove an offset for simplex operation, set the repeater
offset to 0.00
.
MR
Note: While
and
Cappear, you can program other set-
tings such as CTCSS tones (see “Continuous Tone Coded
Squelch System Features” on Page 35.)
To enable the calling frequency, press C at any time. The trans-
ceiver immediately tunes to that frequency with the settings you
programmed. To exit the calling frequency mode, press C again.
31
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SCANNING OPERATION
SCANNING FOR ACTIVE FREQUENCIES
1. To search for activity on a frequency, press
. The trans-
SC
ceiver begins to scan up or down the full frequency range,
and it stops on each active frequency for the duration set by
the scan delay option (see “Using Scan Delay” on Page 32).
2. To change the scanning direction, press
or
.
3. To stop on a frequency or to stop scanning completely,
press SC again.
Using Scan Delay
that signal
If the HTX-400 stops on a signal during scanning, then
stops, the scan delay feature delays the continuation of scanning
to allow time for the signal to restart. Access the Main Menu (see
“Using the HTX-400’s Menus” on Page 16) to set the value. With
Sd
press
or
to select the
and the current delay time shown,
new delay time (between 1 and 30 seconds).
SCANNING STANDARD MEMORY
LOCATIONS
MR
1. Press MR
appears), then press SC. The transceiver
(so
scans all locations except empty locations and the ones you
programmed to be passed during scanning.
2. To change the scanning direction, press
or
.
3. To stop scanning, press SC again.
32
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Setting A Memory Location to Always Skip
During Scanning
The HTX-400 is preset to include all memory locations (except
empty locations) during memory scanning . Follow these steps
to set the transceiver to have it always skip (or resume scan-
ning) a specific location during scanning.
MR
1. Press MR.
and the last used memory location appear.
2. Repeatedly press
location.
or
to select the desired memory
MR
3. Press FUNC+MR. The selected memory location and
flash.
4. To set the HTX-400 to skip the memory location, press SC,
then press
or
so SCSPON(scan skip) appears.
To include the displayed location during scanning, press
or so SCSPoFappears.
5. When you finish, press SC again, then press PTT to store
the setting.
33
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Temporarily Locking Out (Skipping) Locations
During Memory Scanning
You can set the transceiver to lock out a location while scanning
the frequencies stored in memory.
When the transceiver stops at a memory location you want to
FUNC PASS
briefly appears and the transceiver con-
skip, press
.
tinues to scan, locking out (skipping) that location from then on.
Repeat this for each location you want to skip.
To cancel the settings and have the HTX-400 include the skipped
frequencies once again, turn the radio off then on again.
You cannot lock out all memory locations. One location is
Note:
always active. If you lock out all but two active locations and then
lock out one more, EMPTYbriefly appears and scanning stops.
34
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CONTINUOUS TONE CODED
SQUELCH SYSTEM FEATURES
Your HTX-400 can transmit and receive a low-level, selectable
subaudible tone at the same time as it transmits (TX) or receives
(RX) a regular signal. This special tone lets you listen only to oth-
er radios set to the same tone frequency when you use the HTX-
400 in simplex operation. It also lets you match your radio to the
subaudible tone frequency used by a local repeater.
To enable the TX and RX tones for the HTX-400, follow these
steps.
1. Press FUNC+ . The current tone setting appears (tONEoF
or tone on).
2. Press
or
to turn on the option . tONE on appears.
3. To set a receive (RX) tone, press FUNC+ . rC appears.
Then press
or
to select a tone frequency from the list
on Page 36.
For this example, 67.0 Hz was selected for
both the transmit and receive frequencies.
4. To set a transmit (TX) tone, press FUNC+ . tC appears.
Then press
on Page 36.
or
to select a tone frequency from the list
5. Press PTT to store all the settings.
35
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To select and store a CTCSS subaudible tone in a memory loca-
MR
MR.
tion, press
and the last used memory location appear.
(In the examples shown on the preceding page, memory location
2 is used.) Then follow the preceding Steps 1–5.
Subaudible Tone Frequencies (Hz)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
167.9
173.8
179.9
183.5
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
Off
36
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TONE PAGING
You can set the HTX-400 to sound an alert tone when it receives
a transmission that includes the currently set subaudible receive-
tone (or any transmission, if the receive-tone or the tone feature
is set to off). Turn off the radio, then press
HTX-400 on again. appears.
while you turn the
The first time the HTX-400 receives a transmission that matches
the current CTCSS settings, it sounds the selected alert tone,
then turns off the tone paging feature. To turn the feature back on,
turn the power off then on again while holding down
.
Follow these steps to change the alert tone.
1. Select the VFO mode. (See “Selecting Frequencies (Direct
Tuning)” on Page 23.)
2. Hold down FUNC and press
(T.SET) four times. MELand a
number from 1to 5appear. Release FUNC.
3. Repeatedly press either
or
to step through the five dif-
ferent tones. If key tone is enabled, each tone sounds as
you select its number.
4. Press PTT to store your selection and exit the menu.
SENDING PAGING TONES
To transmit the selected paging tone, press
while pressing
PTT
.
37
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OTHER SPECIAL FEATURES
CHANGING THE TRANSMIT FREQUENCY
RANGE
You can change the standard transmit frequency range from
430–450 MHz to an extended range of 420–450 MHz.
To set the transceiver to its extended range, turn off the transceiv-
er, then hold down SC and turn on the transceiver again.
To return to the standard frequency range, turn off the transceiv-
er, then hold down
and turn it on again.
SC
LOCKING THE KEYPAD
To lock the transceiver’s keypad so you do not accidentally
FUNC LOCK
change a setting, press
+
.
appears. This locks all
PTT
VOL
SQ
, and .
buttons except
,
,
FUNC LOCK
To unlock the keypad, press
+
again.
LIGHTING THE DISPLAY
Press
to turn on the display’s backlight for about 4 seconds. If
you press any key while the light is on, the light remains on for
about 4 seconds more. Hold down for at least 1 second to have
the light remain on until you press
again.
38
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TURNING THE KEY TONE ON AND OFF
The transceiver is preset to sound a beep each time you press a
FUNC
BEEP)
.
(
key. To turn off the beep, press
To restore the key tone, press
+
+
(
disappears.
BEEP
) again.
FUNC
Note: If the key tone feature is disabled, the power-on tone does
not sound.
CHECKING THE CURRENT MEMORY
SETTINGS
If you hold down MO (REV) for longer than 1 second, the squelch
opens and the set values for receive tone (rTon/off), transmit
tone (tton/off), scan skip condition (SCSP)(if any), repeater
offset (r), and frequency step (CS) appear.
Release MO (REV) to turn on the squelch again.
SETTING THE FREQUENCY STEP
To change the frequency increment used during scanning and
stepping to a frequency, use the Main Menu to access the CS op-
tion setting (see “Using the HTX-400’s Menus” on Page 16). Then
repeatedly press
or
until you reach the desired setting. You
can change the frequency step to 5 kHz, 10 kHz, 12.5 kHz, 15
kHz, 20 kHz, 25 kHz, 50 kHz, or 1 MHz. (The example shown
here is 25 kHz.)
39
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POWER SAVE
The power save feature lets the radio conserve battery power by
turning off power to the receiver section and periodically turning
it on to check for a transmission. Use the Main Menu to set the
power save option (see
“Using the HTX-400’s Menus” on Page
With PSand the current status (onor oFF) displayed, press
16).
or
to turn this feature on or off.
TIME-OUT TIMER
When you communicate using repeaters, keep your transmis-
sions as brief as possible. Most repeaters have built-in timers that
limit single transmissions to 3 minutes or less. You can set the
transceiver to stop transmitting and sound a beep if you exceed
a set time limit with a single transmission.
Use the Main Menu (see “Using the HTX-400’s Menus” on Page
16) to set a value for the time-out timer. With totand the current
setting displayed, press
seconds.
or
to choose a value from 0 to 990
40
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REDUCING SQUELCH TAIL
If you are communicating with a repeater or another station using
subaudible tones, you can eliminate the squelch tail (the burst of
noise the other person hears when you stop transmitting) by turn-
ing on the transmit delay option. When you turn on this feature
and use CTCSS, the radio continues to transmit for a short period
of time after you release PTT, but then it immediately drops the
subaudible tone. This causes the other radio to close the squelch
before there is “dead air,” preventing the squelch tail.
Use the Main Menu (see “Using the HTX-400’s Menus” on Page
16) to set the transmit delay option, . Then, with t.dy and the
current status displayed, press
off.
or
to turn this feature on or
BUSY CHANNEL LOCKOUT
Use the Main Menu to set the busy channel lockout (see “Using
the HTX-400’s Menus” on Page 16). The lockout prevents the
transceiver from transmitting while it is receiving a signal. With
the radio’s preset value bCLO oF displayed, press
or
to
change the display to bCLO oN. Repeat this step to change the
display back to bCLOoFto disable the lockout .
41
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TROUBLESHOOTING
If your transceiver is not working as it should and it displays an
error message, these suggestions might help you eliminate the
problem. If the transceiver still does not operate properly, take it
to your local RadioShack store for assistance.
You see
S-SHORT
Possible Cause
Remedies
If the transceiver
detects a shorted
external microphone
connection, it auto-
matically switches off
power to the audio
amplifier and dis-
plays S-SHORTto
indicate a short cir-
cuit.
Remove the con-
nected micro-
phone and
replace it, or use
the internal micro-
phone.
PLL-Error
EEP-Error
Indicates a PLL cir-
cuit malfunction due
to a defect in the
VCO circuit or bias
supply.
Turn power off
then on again.
The EPROM infor-
mation needs to be
reset.
Reset the trans-
ceiver. See
“Resetting the
HTX-400” on
Page 44.
42
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CARE AND MAINTENANCE
Your RadioShack HTX-400 Mini Handheld 70-Centimeter FM
Amateur Transceiver is an example of superior design and
craftsmanship. The following suggestions will help you care for
your transceiver so you can enjoy it for years.
Keep the transceiver dry. If it gets wet, wipe it dry
immediately. Liquids might contain minerals that
can corrode the electronic circuits.
Use and store the transceiver only in normal tem-
perature environments. Temperature extremes
can shorten the life of electronic devices, damage
batteries, and distort or melt plastic parts.
Keep the transceiver away from dust and dirt,
which can cause premature wear of parts.
Handle the transceiver gently and carefully. Drop-
ping it can damage circuit boards and cases and
can cause the transceiver to work improperly.
Use only fresh batteries of the required size and
recommended type. Batteries can leak chemicals
that damage your transceiver’s electronic parts.
Wipe the transceiver with a damp cloth occasion-
ally to keep it looking new. Do not use harsh
chemicals, cleaning solvents, or strong detergents
to clean the transceiver.
Modifying or tampering with the transceiver’s internal compo-
nents can cause a malfunction and might invalidate its warranty
and void your FCC authorization to operate it. If your transceiv-
er is not performing as it should, take it to your local Ra-
dioShack store for assistance.
43
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USING THE KEYPAD DIAGNOSTIC
The HTX-400 has a built-in diagnostic program that lets you con-
firm whether the keypad switches are functioning correctly. To
use this diagnostic program, follow these steps.
1. Hold down MO (REV) and turn on the transceiver.
2. Press MO (REV) again. PrESSdnappears.
3. Press
. If the action is correct, PrESSUpappears.
4. Press . If the action is correct, PrESMrappears.
5. Press MR (MW). If the action is correct, PrESSScappears.
6. Press SC (RPT). If the action is correct, PrESSbpappears.
7. Press
appears.
(BEEP). If the action is correct, PrESS Lc
8. Press LOCK (C). If the action is correct, Fappears.
9. Press FUNC. If the action is correct, PrESMoappears.
10. Press MO (REV). If this action is correct, GOOD appears
briefly and then the set frequency appears again.
RESETTING THE HTX-400
If the transceiver’s display locks up or the transceiver does not
work properly after you turn it on, you might need to reset it.
Caution: This procedure clears all the information you have pro-
grammed into the transceiver. Before you reset the transceiver,
try turning it off then on again to see if it begins working properly.
FUNC MO
To reset the transceiver, turn it off then hold down
+
and
iniTial
turn it on again.
appears to confirm the reset opera-
FUNC MO
.
tion. Release
+
44
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SPECIFICATIONS
GENERAL
Frequency:
RX .............................................................. 420–470 MHz
TX ............................................................... 430–450 MHz
Extended TX Range.................................... 420–450 MHz
Frequency Generation .............................. PLL Synthesizer
Frequency Stability ................................................ ± 5 ppm
Operating Temperature ........... 14° to 131°F (–10° to 55°C)
Power Source ............................................... DC 3.0V to 9V
Modulation .................................................................... F3E
Impedance .............................................................. 50 ohm
Dimensions (HWD) ....................... 21/4 × 33/8 × 11/16 inches
85 × 58 × 26.5 mm
Weight (without batteries) ............................. 4.2 oz (120 g)
RECEIVER
Circuit Type ................. Dual Conversion, Superheterodyne
IF Frequency:
1st IF ................................................................ 30.85 MHz
2nd IF ................................................................... 450 kHz
Sensitivity ........................................ 0.22 µV for 12 dB SND
Selectivity ........................................................... 50 dB Min.
Spurious and Image Rejection ........................... 60 dB Min.
Intermodulation .................................................. 60 dB Min.
Distortion ............................................................ 10% Max.
S/N Ratio ........................................................... 35 dB Min.
Audio Output @10%THD ................... 90 mW 16 Ohm, BTL
TRANSMITTER
Power Output .................... 200 mW, DC 3.0V/1W, DC 9.0V
Distortion ....................................................................... 5%
Deviation ................................................................. ± 5 kHz
S/N Ratio ................................................................... 36 dB
Current Drain ..................... 600 mA, DC 3V/900mA DC 9V
Specifications are typical; individual units might vary. Specifica-
tions are subject to change and improvement without notice.
45
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NOTES
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Limited One-Year Warranty
This product is warranted by RadioShack against manufacturing defects in
material and workmanship under normal use for one (1) year from the date of
purchase from RadioShack company-owned stores and authorized Ra-
dioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, Ra-
dioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED
WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FIT-
NESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO
THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED
HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO
LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PER-
SON OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR DAMAGE
CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF
THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR-
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING
FROM INCONVENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE,
OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSE-
QUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF
THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty
lasts or the exclusion of incidental or consequential damages, so the above
limitations or exclusions may not apply to you.
In the event of a product defect during the warranty period, take the product
and the RadioShack sales receipt as proof of purchase date to any Ra-
dioShack store. RadioShack will, at its option, unless otherwise provided by
law: (a) correct the defect by product repair without charge for parts and la-
bor; (b) replace the product with one of the same or similar design; or (c) re-
fund the purchase price. All replaced parts and products, and products on
which a refund is made, become the property of RadioShack. New or recon-
ditioned parts and products may be used in the performance of warranty ser-
vice. Repaired or replaced parts and products are warranted for the
remainder of the original warranty period. You will be charged for repair or re-
placement of the product made after the expiration of the warranty period.
This warranty does not cover: (a) damage or failure caused by or attributable
to acts of God, abuse, accident, misuse, improper or abnormal usage, failure
to follow instructions, improper installation or maintenance, alteration, light-
ning or other incidence of excess voltage or current; (b) any repairs other
than those provided by a RadioShack Authorized Service Facility; (c) con-
sumables such as fuses or batteries; (d) cosmetic damage; (e) transporta-
tion, shipping or insurance costs; or (f) costs of product removal, installation,
set-up service adjustment or reinstallation.
This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
RadioShack Customer Relations, 200 Taylor Street, 6th Floor,
Fort Worth, TX 76102
04/99
We Service What We Sell
08A99
Printed in Korea
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