Radio Shack HTX-10 User Manual

A

Cat. No. 19-1110

OWNER’S MANUAL

Please read before using this equipment.

HTX-10

10-Meter Transceiver

FEATURES

Your RadioShack HTX-10 10-Meter Transceiver is ideal for use
in your vehicle. Its 25-watt SSB/FM and 7-watt AM output pro­vides the power you need to communicate, and its tuner covers
the entire 10-meter Amateur Radio band (including the 28.3 to

28.5 MHz Novice band). You can connect a DC power supply and
base station antenna to your transceiver to set up a base station
in your home. The transceiver’s crystal-controlled circuitry pro­vides accurate and stable channel selection, making it an ideal
choice for your amateur communications needs.

Your transceiver has these advanced features:

Large, Illuminated, Digital Display

— clearly shows the fre-

quency, functions, and incoming signal strength.

1 kHz Frequency Resolution —

lets you fine tune frequencies

for optimum transmission and reception.

Scan

— the transceiver scans its frequency range for transmis-

sions.

MIC and RF Gain Control

— lets you adjust th e microp hone and

receiver gain to match the strength of the received signal.

Switchable Noise Blank er

— reduces interference from ignition

systems, motors, and other electrical equipment.

Squelch Circuit

— compensates for signal fad ing and eliminates

signal chopping.

Automatic Gain Control

— maintains a constant volume level,

regardless of the signal strength.

Built-In Automatic Modulation Control

— ensures a constant

RF modulation level.

Universal Mounting Bra cket

— lets you mount y our tran sceiv er

securely in your vehicle or on a shelf in your home.

© 2000 Tandy Corporation.

RadioShack is a registered trademark used by Tandy Corporation.

All Rights Reserved.

2

Important

Radio Operator’s License, and a call sign issued by the FCC, to
legally transmit using this transceiver. Transmitting without a li­cense carries heavy penalties. Getti ng a license is ea sier than ev­er. See “Introduction to Amateur Radio” on Page 6 for more
information.

We recommend you record your transceiver’s serial number
here. The number is on the transceiver’s back panel.

Serial Number ____________________________

: You must have a Technic ian Clas s or hig her Amateu r

3

MANUAL CONVENTIONS

Your transceiver’s button s perform multiple function s. The ab bre­viation or symbol for a function is printed on, below, or above
each button.

To activate certain transceiver features, you must press

FUNC

(function) then another button.

Button names are p rinted in this man ual in s mall, bol d, capita l let­ters (such as
bers that appear on the display are printed using a distinctive
typeface (such as

PUSH FUNC

28.300

or

SCAN

). Words, symbols, and num-

or

BUSY

).

PUSH

FCC INFORMATION

This device complies wit h Part 15 of the
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 un­desired operation.

This equip ment c omplies wit h the li mits for a C lass B digit al de ­vice as specified in Part 15 of
reasonable protec tio n ag ai nst radio and TV interferen ce in a re s­idential area. However, your equipment might cause TV or radio
interference even when it is operating properly. To eliminate in­terference, you can try one or more of the following corrective
measures:

• reorient or relocate th e receiving antenna

• increase the distance between the equipment and the radio
or TV

FCC Rules

FCC Rules

. These limits provide

. Operation is

Consult your local RadioShack stor e if the problem still exists.
You must use shielded interface cables with this equipment.

4

CONTENTS

Introduction to Amateur Radio ............................................. 6

Preparation ............................................................................. 8

Attaching the Microphone Holder ...................... ...... ..... .... 8

Mounting the Transceiver ................................................. 8

Connecting an Antenna .................................................. 10

Connecting the Microphone ............................................ 12

Connecting an Optional External Speaker ...................... 12

Using Vehicle Battery Power .......................................... 13

Using the Transceiver as a Base Station ........................ 14

A Quick Look at the Controls ............................................. 16

Operation .............................................................................. 17

Setting Squelch and Receiving ....................................... 17

Transmitting .................................................................... 18

Notes on SSB Reception ................................................ 19

Special Features .................................................................. 20

Using the Special Features ............................................. 20

Using STEP ............................................................. 21

Using CALL ............................................................. 22

Using SCAN ............................................................ 22

Using LCR (Last Channel Recall) ............................ 23

Using M-LOAD ........................................................ 23

Using NB (Noise Blanker) ........................................ 23

Using SHIFT ............................................................ 24

Using T-LOW (Tone-Low) ........................................ 24

Using M-SAVE (Memory Save) ............................... 25

Using FINE (Clarifier) .............................................. 25

Using RF-G (RF Gain) ............................................. 26

Using MIC-G (Microphone Gain) ............................. 26

Turning the Key Tone on and Off .................................... 26

Care and Maintenance ......................................................... 27

Troubleshooting ................................................................... 28

Noise Reduction ............................................................. 29

Replacing the Fuse ......................................................... 30

Specifications ....................................................................... 32

5

INTRODUCTION TO AMATEUR
RADIO

This transceiver is a great intermediate-level tool for the experi­enced amateur radio operator. The transceiver opens a door for
you to the world from almost anywhere! All you need is an Ama­teur Radio Operato r’s Licen se (Novic e Clas s, or Tec hnician Plus,
or higher) issued by the Federal Communications Commission
(FCC). If you do not have a license, it is easier than ever to get
one and help from lic ensed ope rators is avai lable. He re 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;

you get your license

in violation of federal law. That violation can lead to severe pen­alties. Note that ham o perators take th e FCC rules very se riousl y
and want nothing to do wit h “bootlegg ers” — thei r term for people
who operate without a license.

Find out if there is a ha m radi o c lub in your area. Most clu bs wel­come newcomers and are glad to help you get your license.
There are thousands of clubs acro ss the country, so there is prob­ably one in or near your own community. Often, the staff at your
local RadioShack store can help you locate a club.

however, do not attempt to transmit until

. If you transmit without a license, you are

If you do not hear anyone talking about a local club in your area
as you listen to local transmissions, write to the American Radio
Relay League (ARRL) at th e foll owin g addre ss, to fin d out ho w to
contact a local affiliate. The ARRL is the national organization
representing amateur 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 lice ns e.

The American Radio Relay Leagu e

225 Main Street

Newington, CT 06111

http://www.arrl.org

6

Start studying for the licen se exams . Do not be inti midated b y the
word “study,” for most people can go from knowing absolutely
nothing about amateur radio to passing the Novice and Techni­cian written exams in less than a month.

The exams test yo ur knowledg e of basi c radio regulatio ns and el ­ementary ra dio theory. Many cl ubs hold license clas ses, which
can be a fun and easy way to learn about amateur radio. There
are good books, cassette tapes, computer programs, and many
other study aids ava ilable. Your loc al RadioShack st ore sells

License Preparation

censes. While you are no longer required to learn Morse code for
a Technician Class lice nse, we enc ourage y ou to learn it any way
so you can advance to higher levels of operating privileges.

The examiners for a Novice license test can be any two ham op­erators who hold a genera l or hig her class li cense an d who are a t
least 18 years old and are not related to you. 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 th e Technic ian exam, and the test mu st be
administered by a three-member Volunteer Examiner Team.
Contact the ARRL for a schedule of exam opportunities in your
area.

A Novice Class or Techni cian Plus (or higher) license lets you use
the HTX-10 to communicate directly with other operators.

study guides for amateur radio operator li-

FCC

Amateur radio is a great h obby that has enriched th e li ves of mil­lions of people a ll over the world . The ARRL wo uld be glad to hear
from you if you need more information or would like to join!

7

PREPARATION

ATTACHING THE MICROPHONE
HOLDER

You can connect the microphone holder horizontally or vertically
to either side of the transceiver or to another location in your ve­hicle.

Use the supplied screws and lock washers to secure the holder
to the side of the transceiver.

Or, follow these steps to attach the holder to another location in
the vehicle (such as the dashboard).

1. Using the holder as a template, mark the positions for the
mounting screw holes at the desired location.

2. At each marked position, drill a hole slightl y sm all er th an t he
supplied mounting screws.

Caution:

mounting surface.

3. Attach the holder at the mounting location using the sup­plied machine screws and lock washers.

Be careful not to drill into anything behind the

MOUNTING THE TRANSCEIVER

The most common mo un ting lo cation for this trans ceive r is un der
a vehicle's dashboard. If you use the HTX-10 as a base station,
however, you can place it on a desk, shelf, or table (see “Using
the Transceiver as a Base Station” on Page 14).

8

If you are mounting the transceiver in a vehicle, choose a loca­tion where:

• you can easily reach the transceiver.

• wires and cables are clear of the vehicle's pedals or other
moving parts.

• the transceiver is not directly in front of heating vents.

• all wires and cables can reach their connection points.

Warning:

to avoid damage to th e tra nsc ei ve r or v ehi cl e, a nd to av oid injury
to anyone in the vehicle during sudden starts or stops.

Follow these steps to mount the transceiver using the supplied
hardware.

1. Using the mounting bracket as a template, mark the posi-

2. In each marked location, drill a hole slightly smaller than the

3. Using a Phillips screwdriver, attach the mounting bracket to

If you use the trans ceiver in a ve hicle, mount it securely

tions for the screw holes on the mounting surface.

supplied mounting screws.

Caution:

mounting surface.

the mounting surface with the supplied mounting screws
and flat washers.

Be careful not to drill into objects behind the

9

4. Attach the transceiver to the mounting bracket using the

s

supplied rubber washers and mounting knobs.

(Rubber washer

not shown)

CONNECTING AN ANTENNA

There are many diffe rent types of transceiv er antennas for mobile
transceivers. Each antenna type has its own benefits, so choose
the one that best m eets you r needs. Yo ur local Ra dioSha ck store
sells a wide variety of antennas.

Note:

If you are us ing t his trans ceiv er as a b ase statio n, se e “Us-

ing the Transceiver as a Base Station” on Page 14.
When you choose an antenna, keep in mind that for the best

performance you should mount the antenna:

• as high as possible on the vehicle

• as far as possible from sources of electrical noise

•vertically

10

Once you choose an antenn a, follow
its mounting instru ctions. Then route
the cable to the transce iver and co n-

ANT

nect the cable to the

jack on the

back of the transceiver.

Cautions:

• Avoid routing the cable next to
sharp edges or moving parts,
which might damage the cable.

• Do not run the cable next to
power cables or other radio
antenna cables.

• Do not run the cable through the engine compartment or
other areas that produce extreme heat.

To achieve your radio's maximum range, adjust the antenna's
Standing Wave Ratio (SWR). You can use an SWR meter (not
supplied) to adjust the SWR for your antenna.

Follow the instruction s supplied wit h the SWR mete r and antenna
to adjust your ante nna 's SWR to the lowest pos si bl e v alu e. SWR
values of 2.0:1 are generall y acceptable , with readings of 1.5:1 or
lower being more desirable.

Caution:

You might damage your transceiver if you use it at a

high SWR value.

11

CONNECTING THE MICROPHONE

1. Align the slot on the bottom of the
microphone’s plug with the ridge
inside the
the plug into the jack.

2. Turn the plug’s locking nut clock­wise to tighten it.

3. Slide the microphone onto
the microphone holder.

To disconnect the microphone,
unscrew the locking nut and
gently pull out the microphone
plug. Never pull on the micro­phone cable to disconnect the
microphone.

MIC

jack. Then fu ll y in se r t

CONNECTING AN OPTIONAL EXTERNAL
SPEAKER

You can connect an external speaker to the transceiver. The ex­ternal speaker you use with the transceiver should have an im­pedance of 8 ohms and be able to handle 3 to 10 watt s of power.
The speaker’s cable must hav e a
cessories are available at your local RadioShack store.

1

/8-inch (3.5–mm) plug . Both ac-

12

To connect the external speaker to

Red wire to
positive (+) terminal

Black wire to
negative (-) terminal

the transceiver, insert the speaker's
plug into the

EXT

jack on the back of

the transceiver

Note:

Connecting an external
speaker disconnects the transceiv­er's internal speaker.

USING VEHICLE BATTERY POWER

Follow these steps to connect the
transceiver to your vehicle’s bat­tery power.

1. Connect the red wire (with in­line fuse holder) from the
back of the transceiver to a
point in your vehicle's fuse
block that has power only
when the ignition is in the
ACC (accessory) or ON posi­tion.

2. Connect the black wire to a
metal part of the vehicle's
frame (chassis ground).

13

Caution:

(plastic) part, or to any part insulated from the vehicle's
chassis by a non-metallic part.

3. Connect the single connector end of the power cord to the
connector on the back of the transceiver.

Do not connect the black wire to a non-metallic

USING THE TRANSCEIVER AS A BASE
STATION

Although this transceiver is designed mainly for mobile use, you
can also use it as a base station with an AC power source. For
base station installation, you need these items.

• a 12-volt DC power supply that can supply at least 7 amps

Caution:

dard AC outlet to produce DC power. Before connecting
your transceiver to a 12-volt DC power supply, read and fol­low the instructions included with the power supply.

• base station antenna

• coaxial antenna cable and connectors

• external 8-ohm speaker

Note:

need to use the transceiver as a base station.

Most 12-volt DC power supplies plug into a stan-

Your local Radi oShack store carries everything you

14

Follow these steps to install the transceiver as a base station.

1. Mount the base station antenna as described in its owner's
manual.

Warning:

Use extreme caution when you install or remove
a base station antenna. If the antenna starts to fall, let it go!
It could contact overheard power lines. If the antenna
touches a power line, contact with the antenna, mast, cable,
or guy wires can cause electrocution and death. Call the
power company to remove the antenna. DO NOT attempt to
do so yourself.

ANT

2. Connect the antenna to the

jack on the back of the

transceiver.

3. Connect the transceiver's black power wire to the negative
(–) terminal on the DC power supply.

4. Connect the transceiver's red wire (with in-line fuse holders)
to the positive (+) terminal on the DC power supply.

5. Connect the single–connector end of the power cord to the
connector on the back of the transceiver.

6. Connect the DC power supply to a standard AC outlet.

15

A QUICK LOOK AT THE CONTROLS

OFF/V OLUME

RF-G/MIC-G

— turns the radio on/off; adjusts the volume

— attenuates strong signals; reduces the micro-

phone’s gain and SSB transmitting power

STEP/NB/1

— selects the frequency tuning step; turns the noise

blanker on/off; selects memory Channel 1

CALL/2

—

quickly recalls a frequency in memory Channel 2; se-

lects memory Channel 2

SCAN/SHIFT/3

— starts/stops scanning; selects the frequency

shift; selects memory Channel 3

LCR/4

— recalls the last tuned channel; selects memory Channel 4

MODE/T -LO W/5

— selects the operation band, AM/FM/USB/LSB;

turns hi-cut filter on/off; selects memory Channel 5

M-LOAD/M-SAVE

FINE/PUSH FUNC

SQUELCH

TUNE

— selects a frequency

— loads from/saves to a memory location

— adjusts fine tuning; a ctivates s econd function

— sets the squelch level to block weak signals

16

OPERATION

SETTING SQUELCH AND RECEIVING

1. Rotate

2. Rotate

3. To turn on the transceiver, rotate

SQUELCH

RF-G

until it clicks. The display lights and the frequency appears.
A bar graph also appears which sh ows the rec eiv ed sign al ’ s
strength.

fully counterclockwise.

fully clockwise.

OFF/VOLUME

Frequency
Bar Graph

clockwise

OFF/V OLUME

4. Set

5. Rotate
Then slowly rotate
noise stops.

SQUELCH

to a comfortable listening level.
clockwise until you hear a hissing sound.

SQUELCH

counterclockwise just until the

17

Note:

If the transceiver picks up unwanted weak transmis-

RF-G

sions, ro tat e

slightly c o un ter c lo ck wi se to d ec r ease th e
transceiver ’s sensitivity to signals. The transceiver blocks
the weak transmissions.

MODE

6. Repeatedly press

to select the desired band (FM,

AM, USB (upper sideband), or LSB (lower sideband)).

7. Rotate

TUNE

or press UP or DN on the top of the micro-

phone to select a frequency.

8. To turn off the transce iver, rotate

OFF/VO LUME

counterclock-

wise until it clicks.

TRANSMITTING

Notes:

• Do not attempt to transmit unless you possess a valid ama­teur radio license.

• We recommend you try receiving before you transmit.

1. Follow Steps 1–7 in “Setting Squelch and Receiving” on
Page 17.

MIC-G

2. Turn

18

fully clockwise.

3. To transmit, hold down the push-to-talk button on the micro­phone, hold the microphone 2–3 inches from your mouth,
and speak in a normal tone of voice. TX appears along with
a bar graph which shows the strength of your transmission.

4. When you finish transmitting, release the PTT button.
and the signal strength bars disappear.

5. To turn off the transc eive r, rotate
wise until it clicks.

OFF/V OLUME

counterclock-

NOTES ON SSB RECEPTION

• If the voice sounds distorted, slowly rotate
signal into its natural voice tonal range.

• An SSB signal produces a fluttering, unintelligible sound
when received in the AM mode. Set the mode switch to
either LSB or USB, and adjust
intelligible, it might be an SSB signal operating on the other
sideband — try the other SSB mode.

FINE

FINE

to bring the

. If the voice is still not

TX

19

SPECIAL FEATURES

USING THE SPECIAL FEATURES

Your transceiver has severa l advanced featu res that give you ad­ditional control and convenience while using it.

This list provides additional information about your transceiver’s
special features.

Feature See:

Step

— let’s you change the incre­ment you set to tune frequencies in
the 10-meter band.

Call

— recalls a specific frequency in

memory channel 2.

Scan

— scans incom ing signals. Page 22

Page 21

Page 22

Last Channel Recall

last channel that was transmitted.

M-LOAD

in memory Channels 1–5.

NB (Noise Blanker)

trical noise.

Shift

direction and offset frequency.

T-LOW (Tone Low)

cut filter on or off.

M-SAVE (Memory Save)

to five frequencies into memory chan­nels.

FINE (Clarifier)

tunes out interference broadc ast using
an SSB signal.

20

— recalls frequencies sto red

— lets you set the fre quency shift

— returns to the

— reduces elec-

— turns the high-

— saves up

— tunes in stati ons or

Page 23

Page 23

Page 23

Page 24

Page 24

Page 25

Page 25

Feature See:

RF-G (RF Gain)

— attenuates strong

Page 26

signals.

MIC-G (Microphone Gain)

—

Page 26
reduces the microphone gain and
SSB transmitting power,

Using STEP

Repeatedly pres s
ceiver displays when it shows a frequency. As you pres s
one of the three freque nc y d igi ts flashes for about 2 s ec ond s to
show which digit is selected. The increment that the selected
digit disp lays is:

• the rightmost digit: 1 kHz

• the second digit from the right: 10 kHz

• the third digit from the right: 100 kHz

STEP

to select the frequ ency step your trans-

STEP

,

21

Using CALL

The transceiver’s call memory lets you quickly recall a specific
frequency in memory Channel 2.

Note:

See “Using M-SAVE (Memory Save)” on Page 25 fo r more

information about storing a frequency in memory channel 2.

CALL

Press
quency flashes.

Press

to recall the stored frequency at any time. The fre-

CALL

again and the last selected frequency appears.

Using SCAN

SCAN

Press
transceiver stops for 5 seconds on each channel when it detects
a signal.

To stop scanning, press
phone.

22

to scan incoming signals.

SCAN

SCAN

disappears.

or the PTT button on the micro-

SCAN

appears and the

Using LCR (Last Channel Recall)

LCR

Press

to return to the last channel you selected.

Using M-LOAD

You can recall frequencies stored in memory Channels 1–5.

Note:

See “Using M-SAVE (Memory Save)” on Page 25 for more

information about storing frequencies in memory channels.
To recall a m emory chann el, pre ss

press the desired memory channel number.

M-LOAD

so L appears, then,

Using NB (Noise Blanker)

If the transceiver’s reception is disturbed by interference from
electrical noise (suc h as ign ition noise), you can reduce the noise
by using the transmitter’s noise blanker feature. To turn on or off
the noise blanker, press
the noise blanker is on.

PUSH FUNC

then NB. NB appears while

23

Using SHIFT

The transceiver’s shi ft function lets yo u set the transmit frequ ency
shift from the receive frequency in either direction within the
range of 0.0 Hz to 990 kHz.

Follow these steps to set the frequency shift direction and offset
frequency.

ress

1. To set the frequency shift direction to
then press
Press

SHIFT

PUSH FUNC

set the frequency shift direction to

2. Press

PUSH FUNC

while

and

then

FUNC

SHIFT

SHIFT

appears.

again while

-. -SHIFT

for about 3 seconds.

appears.

3. Rotate

TUNE

to set the offset frequency to any frequency

from 0 to 990 kHz.

4. To exit, hold down

PUSH FUNC

and

SHIFT

3 seconds.

+,

PUSH FUNC

p

+SHIFT

FUNC

appears.

appears to

appears

.

000

together for about

Using T-LOW (Tone-Low)

PUSH FUNC

Press

LOW

appears when the high-cut filter is on.

24

then

T-L OW

to turn the high-cut filter on or off.

Using M-SAVE (Memory Save)

Follow these steps to save up to five frequencies into memory
channels.

1. Select the desired frequency.

2. Press

3. While

4. To recall a frequency you stored, see “Using M-LOAD” on

PUSH FUNC

S

appears, press the desired memory channel num­ber. The transceiver stores the frequency you selected into
the memory channel you selected.

Page 23.

then

M-SAVE

. S appears.

Using FINE (Clarifier)

When you listen to an SSB signal, rotate
off-frequency stations or to tune out interference from adjacent
channels.

FINE

to tune in slightly

25

Using RF-G (RF G a in )

When you receive an extremely strong signal, rotate
terclockwise to attenuate the signal.

RF-G

coun-

Using MIC-G (Microphone Gain)

Rotate
SSB transmitting power for the best audio quality.

MIC-G

to adjust the transmitter’s microphone gain and

TURNING THE KEY TONE ON AND OFF

The transceiver is preset to sound a tone each time you press a
key. To turn the tra nsceive r’s key ton e on or off, tur n on the trans­ceiver while holding down the push-to-talk button on the micro­phone.

26

CARE AND MAINTENANCE

Your HTX-10 10-Meter Transceiver is an example of superior
design and crafts mans hip. Th e foll owin g su ggesti ons wi ll he lp
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 transceiv er only in normal tem­perature environments. Temperature extremes
can shorten the life of electr onic devic es 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.
Dropping it can damage circuit boards a nd case s
and can cause the transceiver to work improper­ly.

Wipe the transceiver with a damp cloth occasion­ally 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 compo­nents can cause a malfunc tion and might inva lidate its warran­ty and void your FCC authorization to operate it. If your
transceiver is not performing as it should, take it to your local
RadioShack store for assistance.

27

TROUBLESHOOTING

If your transceiver is not working as it should, these suggestions
might help you eliminate the problem. If the transceiver still does
not operate properly, take i t to your local Radi oShack store for as­sistance.

Problem Possible Causes Remedies

Trouble with
reception.

Trouble with
transmission.

The squelch might
need to be adjusted.

The transmitter
might not be set to
an operating fre­quency.

The microphone
might not be con­nected.

The antenna might
not be connected.

The receive mode
might not be pro perly
set.

The antenna might
not be connected.

The microphone
might not be con­nected.

The microphone’s
push–to–talk button
might not be fully
pressed in.

Adjust the
squelch.

Tune the trans­ceiver to an oper­ating frequency.

Make sure the
microphone is
connected.

Make sure the
antenna is con­nected.

Set the receive
mode to FM, AM,
LSB, or USB.

Make sure the
antenna is con­nected.

Make sure the
microphone is
connected.

Press the micro­phone’s button in
fully.

28

Problem Possible Causes Remedies

Trouble with
transmission
(continued)

Transceiver
does not work
at all.

The transceiver should be serviced only by a qualified radio
technician. If you sti ll h ave prob lem s , tak e yo ur tran sc eiver to a
local RadioShack store for assistance.

The microphone’s
gain might not be
properly set.

The power cord
might not be con­nected.

The power cord’s
fuse might be blown.

Adjust

Make sure the
power cord is con­nected.

Replace the fuse
(see “Replacing
the Fuse” on P age

30).

MIC-G

.

NOISE REDUCTION

Because your transceiver is exceptionally quiet, any noise you
hear is probably from an exte rnal source in yo ur vehicle such as
your vehicle’s alternator, radio, or spark plugs.

To solve th e proble m, you must go t o the noise's source. You
can determine the noise's source by turning off the engine and
operating the transcei ver with your vehi cle's ignitio n set to ACC.
If the noise decreases, the problem is in your vehicle’s ignition
or electrical system.

Here are a few hints to help you reduce or eliminate such
noise:

• Make all transceiver power and antenna wires as short as
possible.

• Route the power wires away from the antenna wires.

29

• Be sure that the chassis ground connection is secure.

• Replace old igni tion wires with new, high-voltage, noise sup­pression wires.

• Install noise suppressors on your spark plu gs, or install new
spark plugs that have built in noise suppressors.

• If problems persis t, check your al ternato r/genera tor and reg­ulator gauges. You can reduce the noise from these so urces
by using bypass capacitors at the various output voltage
points.

Your local RadioShack store has a wide selection of noise sup­pression accessories.

REPLACING THE FUSE

If the HTX-10 stops operating, you might need to replace the red
power wire’s fuse with the supplied spare fuse.

Caution:

fied here. Doing so might damage your transceiver.
Follow these steps to replace your transceiver’s fuse.

1. Make sure the power source and transceiver are both off.

2. Pull the latches apart on the fuse holder until it opens.

3. If the fuse is blown, replace it. Use only a standard 11/4 × 1/

30

Do not use a fuse with ratings other than those speci-

inch fast-acting fuse with the proper rating. The fuse must
be 10 amps.

4

Caution:

sure you replace a fuse only with another fuse of the same
rating.

4. Reassem bl e th e f us e h ol d er by s qu e ez i ng i t t o ge t her un ti l it
snaps shut.

The supplied fuse has the proper ratings. Make

31

SPECIFICATIONS

GENERAL

Frequency Range ........................... 28.000 MHz to 29.699 MHz

Tuning Step ......................... 1 kHz/10 kHz/100 kHz (selectable)

Frequency Generation ........................... Digital PLL Synthesizer

Antenna Connector ............................ 50 ohm coaxial connector

Microphone ........................................... Electret condenser type

Operating Temperature ................... –4° to 122°F (–10° to 55°C)

Power Source ............. 12–16V DC, negative or positive ground

Speaker ................................................................ 8 ohm, 2 watt

Impedance ...................................................................... 50 ohm

1

Dimensions (HWD) ........................... 6

Weight (without batteries).................................... ............. 2.65 lb

Accessories ............................ Microphone, Microphone Hold er,

Mounting Hardware, Mounting Bracket,

RECEIVER

/16 × 23/64 × 941/64 inches

(154 × 52 × 248 mm)

(1.2 kg)

DC Power Cord, Spare Fuse

Sensitivity .................................................. 0.5 µV for 10 dB S/N

Audio Output @ 10% THD (External) ................ 2.5 W at 8 ohm

Selectivity ................................................................... 50 dB min

Intermodulation ........................................................... 60 dB min

Distortion ..................................................................... 10% max

S/N Ratio .................................................................... 40 dB min

IF Rejection ........................................................ 70 dB or better

32

TRANSMITTER

Power Output ....................................... 7w (AM), 25w (FM/SSB)

Distortion ............................................................................... 5%

Deviation ......................................................................... ±2 kHz

S/N Ratio............................................................................ 40 dB

Spurious Emission ............................................ –65 dB or better

Battery Drain:

At max output power ........................... AM Less than 3.0 A,

FM Less than 5.0 A, SSB 5.0 A

At no modulation ................................. AM Less than 3.0 A,

FM Less than 5.0 A, SSB 1.0 A

Specifications are typical; individual units might vary. Specifica­tions are subject to change and improvement without notice.

33

NOTES

34

35

Limited Ninety-Day Warranty

This product is warrante d by RadioS hack agai nst ma nufactu ring defe cts in mater ial
and workmanship und er normal us e for ninety (90 ) days from th e date of purc hase
from RadioShack company-ow ned stores and authorized RadioS hack franchisees
and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EX­PRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING THOSE
OF MERCHANTABILITY AND FITNESS 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 PERSON 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 WARRANTY,
INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCON­VENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF
RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or the ex­clusion or limitation 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 p roof of purchase date to any RadioShac k store. Ra­dioShack will, at its option, unless otherwise provided by law: (a) correct the defect
by product repair without charge for parts and labor; (b) replace the product with one
of the same or simila r design; or (c) refun d the purchase price. A ll replaced parts
and products, and pro duc ts on whi ch a re fun d i s ma de , be com e the pr ope rty o f R a­dioShack. New or reconditioned parts and products may be used in the performance
of warranty service. Re paired or r eplaced parts and p roducts ar e warranted for the
remainder of the original warranty period. You will be charged for repair or replace­ment 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, m isuse, improper or ab normal usage, fai lure to follow in­structions, improper installation or maintenance, alteration, lightning or other inci­dence of excess voltage or current; (b) any r epairs other tha n those provide d by a
RadioShack Authorized Service Facility; (c) consu mables such as fuses or batter­ies; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs
of product removal, installation, set-up service adjustment or reinstallation.
This warranty giv es you specific legal r ights, 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

We Service What We Sell

12/99

RadioShack

A Division of Tandy Corporation

Fort Worth, Texas 76102

03A00 Printed in Korea