Radio Shack Marine Radio HTX 10 User Guide

A
Cat. No. 19-1110  
OWNER’S MANUAL  
Please read before using this equipment.  
HTX-10  
10-Meter Transceiver  
 
Important: You must have a Technician Class or higher Amateur  
Radio Operator’s License, and a call sign issued by the FCC, to  
legally transmit using this transceiver. Transmitting without a li-  
cense carries heavy penalties. Getting a license is easier than ev-  
er. 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 ____________________________  
3
 
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.  
PUSH  
To activate certain transceiver features, you must press  
FUNC  
(function) then another button.  
Button names are printed in this manual in small, bold, capital let-  
PUSH FUNC  
SCAN  
). Words, symbols, and num-  
ters (such as  
or  
bers that appear on the display are printed using a distinctive  
or  
typeface (such as 28.300 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.  
This equipment complies with the limits for a Class B digital de-  
vice as specified in Part 15 of FCC Rules. These limits provide  
reasonable protection against radio and TV interference in a res-  
idential area. However, your equipment might cause TV or radio  
interference even when it is operating properly. To eliminate in-  
terference, you can try one or more of the following corrective  
measures:  
• reorient or relocate the receiving antenna  
• increase the distance between the equipment and the radio  
or TV  
Consult your local RadioShack store 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 experi-  
enced amateur radio operator. The transceiver opens a door for  
you to the world from almost anywhere! All you need is an Ama-  
teur Radio Operator’s License (Novice Class, or Technician 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 licensed operators is available. 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 violation can lead to severe pen-  
alties. Note that ham operators take the FCC rules very seriously  
and want nothing to do with “bootleggers” — their term for people  
who operate 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 own community. Often, the staff at your  
local RadioShack store can help you locate a club.  
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 the following address, to find out how 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 mem-  
bers in the process of obtaining their license.  
The American Radio Relay League  
225 Main Street  
Newington, CT 06111  
6
 
Start studying for the license exams. Do not be intimidated by the  
word “study,” for most people can go from knowing absolutely  
nothing about amateur radio to passing the Novice and Techni-  
cian 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  
other study aids available. Your local RadioShack store sells  
FCC  
study guides for amateur radio operator li-  
License Preparation  
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.  
The examiners for a Novice license test can be any two ham op-  
erators who hold a general or higher class license and who are at  
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 the Technician exam, and the test must 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 Technician Plus (or higher) license lets you use  
the HTX-10 to communicate directly with other operators.  
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!  
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 ve-  
hicle.  
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 slightly smaller than the  
supplied mounting screws.  
Caution:  
Be careful not to drill into anything behind the  
mounting surface.  
3. Attach the holder at the mounting location using the sup-  
plied machine screws and lock washers.  
MOUNTING THE TRANSCEIVER  
The most common mounting location for this transceiver is under  
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 loca-  
tion 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:  
If you use the transceiver in a vehicle, mount it securely  
to avoid damage to the transceiver or vehicle, and to avoid 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-  
tions for the screw holes on the mounting surface.  
2. In each marked location, drill a hole slightly smaller than the  
supplied mounting screws.  
Caution:  
Be careful not to drill into objects behind the  
mounting surface.  
3. Using a Phillips screwdriver, attach the mounting bracket to  
the mounting surface with the supplied mounting screws  
and flat washers.  
9
 
4. Attach the transceiver to the mounting bracket using the  
supplied rubber washers and mounting knobs.  
(Rubber washers  
not shown)  
CONNECTING AN ANTENNA  
There are many different types of transceiver antennas for mobile  
transceivers. Each antenna type has its own benefits, so choose  
the one that best meets your needs. Your local RadioShack store  
sells a wide variety of antennas.  
Note:  
If you are using this transceiver as a base station, see “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 antenna, follow  
its mounting instructions. Then route  
the cable to the transceiver and con-  
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 instructions supplied with the SWR meter and antenna  
to adjust your antenna's SWR to the lowest possible value. SWR  
values of 2.0:1 are generally 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  
MIC  
inside the  
jack. Then fully insert  
the plug into the jack.  
2. Turn the plug’s locking nut clock-  
wise 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 micro-  
phone cable to disconnect the  
microphone.  
CONNECTING AN OPTIONAL EXTERNAL  
SPEAKER  
You can connect an external speaker to the transceiver. The ex-  
ternal speaker you use with the transceiver should have an im-  
pedance of 8 ohms and be able to handle 3 to 10 watts of power.  
1
8
The speaker’s cable must have a / -inch (3.5–mm) plug. Both ac-  
cessories are available at your local RadioShack store.  
12  
 
To connect the external speaker to  
the transceiver, insert the speaker's  
EXT  
plug into the  
the transceiver  
jack on the back of  
Note:  
Connecting an external  
speaker disconnects the transceiv-  
er's internal speaker.  
USING VEHICLE BATTERY POWER  
Follow these steps to connect the  
transceiver to your vehicle’s bat-  
tery power.  
1. Connect the red wire (with in-  
line 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 posi-  
tion.  
Red wire to  
positive (+) terminal  
Black wire to  
negative (-) terminal  
2. Connect the black wire to a  
metal part of the vehicle's  
frame (chassis ground).  
13  
 
Caution:  
Do not connect the black wire to a non-metallic  
(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.  
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:  
Most 12-volt DC power supplies plug into a stan-  
dard AC outlet to produce DC power. Before connecting  
your transceiver to a 12-volt DC power supply, read and fol-  
low the instructions included with the power supply.  
• base station antenna  
• coaxial antenna cable and connectors  
• external 8-ohm speaker  
Note:  
Your local RadioShack store carries everything you  
need to use the transceiver as a base station.  
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  
transceiver.  
jack on the back of the  
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/VOLUME  
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-LOW/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  
— loads from/saves to a memory location  
— adjusts fine tuning; activates second function  
— sets the squelch level to block weak signals  
— selects a frequency  
SQUELCH  
TUNE  
16  
 
OPERATION  
SETTING SQUELCH AND RECEIVING  
SQUELCH  
1. Rotate  
fully counterclockwise.  
RF-G  
2. Rotate  
fully clockwise.  
OFF/VOLUME  
3. To turn on the transceiver, rotate  
clockwise  
until it clicks. The display lights and the frequency appears.  
A bar graph also appears which shows the received signal’s  
strength.  
Frequency  
Bar Graph  
OFF/VOLUME  
4. Set  
to a comfortable listening level.  
SQUELCH  
5. Rotate  
clockwise until you hear a hissing sound.  
SQUELCH  
Then slowly rotate  
noise stops.  
counterclockwise just until the  
17  
 
Note:  
If the transceiver picks up unwanted weak transmis-  
RF-G  
sions, rotate  
slightly counterclockwise to decrease the  
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)).  
TUNE  
UP  
DN  
or on the top of the micro-  
7. Rotate  
or press  
phone to select a frequency.  
OFF/VOLUME  
8. To turn off the transceiver, rotate  
wise until it clicks.  
counterclock-  
TRANSMITTING  
Notes:  
• Do not attempt to transmit unless you possess a valid ama-  
teur 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 micro-  
phone, hold the microphone 2–3 inches from your mouth,  
and speak in a normal tone of voice. TXappears along with  
a bar graph which shows the strength of your transmission.  
4. When you finish transmitting, release the PTT button. TX  
and the signal strength bars disappear.  
OFF/VOLUME  
5. To turn off the transceiver, rotate  
wise until it clicks.  
counterclock-  
NOTES ON SSB RECEPTION  
FINE  
• If the voice sounds distorted, slowly rotate  
signal into its natural voice tonal range.  
to bring the  
• An SSB signal produces a fluttering, unintelligible sound  
when received in the AM mode. Set the mode switch to  
FINE  
either LSB or USB, and adjust  
. If the voice is still not  
intelligible, it might be an SSB signal operating on the other  
sideband — try the other SSB mode.  
19  
 
SPECIAL FEATURES  
USING THE SPECIAL FEATURES  
Your transceiver has several advanced features that give you ad-  
ditional control and convenience while using it.  
This list provides additional information about your transceiver’s  
special features.  
Feature  
See:  
Page 21  
Step — let’s you change the incre-  
ment you set to tune frequencies in  
the 10-meter band.  
Call — recalls a specific frequency in Page 22  
memory channel 2.  
Scan — scans incoming signals.  
Page 22  
Page 23  
Last Channel Recall — returns to the  
last channel that was transmitted.  
M-LOAD — recalls frequencies stored  
in memory Channels 1–5.  
Page 23  
Page 23  
NB (Noise Blanker) — reduces elec-  
trical noise.  
Shift — lets you set the frequency shift Page 24  
direction and offset frequency.  
T-LOW (Tone Low) — turns the high- Page 24  
cut filter on or off.  
M-SAVE (Memory Save) — saves up Page 25  
to five frequencies into memory chan-  
nels.  
FINE (Clarifier) — tunes in stations or  
tunes out interference broadcast using  
an SSB signal.  
Page 25  
20  
 
Feature  
See:  
Page 26  
RF-G (RF Gain) — attenuates strong  
signals.  
MIC-G (Microphone Gain) —  
reduces the microphone gain and  
SSB transmitting power,  
Page 26  
Using STEP  
STEP  
Repeatedly press  
to select the frequency step your trans-  
STEP  
ceiver displays when it shows a frequency. As you press  
,
one of the three frequency digits flashes for about 2 seconds to  
show which digit is selected. The increment that the selected  
digit displays is:  
• the rightmost digit: 1 kHz  
• the second digit from the right: 10 kHz  
• the third digit from the right: 100 kHz  
Download from Www.Somanuals.com. All Manuals Search And Downloa2d1.  
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 for more  
information about storing a frequency in memory channel 2.  
CALL  
Press  
to recall the stored frequency at any time. The fre-  
quency flashes.  
CALL  
Press  
again and the last selected frequency appears.  
Using SCAN  
SCAN  
Press  
to scan incoming signals. SCAN appears and the  
transceiver stops for 5 seconds on each channel when it detects  
a signal.  
SCAN  
To stop scanning, press  
or the PTT button on the micro-  
phone. SCANdisappears.  
22  
 
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.  
M-LOAD  
To recall a memory channel, press  
so Lappears, then,  
press the desired memory channel number.  
Using NB (Noise Blanker)  
If the transceiver’s reception is disturbed by interference from  
electrical noise (such as ignition noise), you can reduce the noise  
by using the transmitter’s noise blanker feature. To turn on or off  
PUSH FUNC  
NB  
. NBappears while  
the noise blanker, press  
the noise blanker is on.  
then  
23  
 
Using SHIFT  
The transceiver’s shift function lets you set the transmit frequency  
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 PUSH FUNC  
1. To set the frequency shift direction to +, p  
SHIFT  
then press  
Press  
while FUNCappears. +SHIFTappears.  
PUSH FUNC  
SHIFT  
and  
again while FUNCappears to  
appears  
set the frequency shift direction to -. -SHIFT  
.
PUSH FUNC  
SHIFT  
for about 3 seconds. 000  
2. Press  
3. Rotate  
then  
appears.  
TUNE  
to set the offset frequency to any frequency  
from 0 to 990 kHz.  
PUSH FUNC  
SHIFT  
together for about  
4. To exit, hold down  
3 seconds.  
and  
Using T-LOW (Tone-Low)  
PUSH FUNC  
T-LOW  
to turn the high-cut filter on or off.  
Press  
then  
LOWappears when the high-cut filter is on.  
24  
 
Using M-SAVE (Memory Save)  
Follow these steps to save up to five frequencies into memory  
channels.  
1. Select the desired frequency.  
PUSH FUNC  
M-SAVE  
. Sappears.  
2. Press  
then  
3. While Sappears, press the desired memory channel num-  
ber. The transceiver stores the frequency you selected into  
the memory channel you selected.  
4. To recall a frequency you stored, see “Using M-LOAD” on  
Page 23.  
Using FINE (Clarifier)  
FINE  
When you listen to an SSB signal, rotate  
to tune in slightly  
off-frequency stations or to tune out interference from adjacent  
channels.  
25  
 
Using RF-G (RF Gain)  
RF-G  
When you receive an extremely strong signal, rotate  
terclockwise to attenuate the signal.  
coun-  
Using MIC-G (Microphone Gain)  
MIC-G  
Rotate  
to adjust the transmitter’s microphone gain and  
SSB transmitting power for the best audio quality.  
TURNING THE KEY TONE ON AND OFF  
The transceiver is preset to sound a tone each time you press a  
key. To turn the transceiver’s key tone on or off, turn on the trans-  
ceiver while holding down the push-to-talk button on the micro-  
phone.  
26  
 
CARE AND MAINTENANCE  
Your HTX-10 10-Meter 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 and dis-  
tort 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 and cases  
and can cause the transceiver to work improper-  
ly.  
Wipe the transceiver with a damp cloth occasion-  
ally to keep it looking new. Do not use harsh  
chemicals, cleaning solvents, or strong deter-  
gents to clean the transceiver.  
Modifying or tampering with the transceiver’s internal compo-  
nents can cause a malfunction and might invalidate its warran-  
ty 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 it to your local RadioShack store for as-  
sistance.  
Problem  
Possible Causes  
Remedies  
Adjust the  
The squelch might  
need to be adjusted.  
Trouble with  
reception.  
squelch.  
The transmitter  
might not be set to  
an operating fre-  
quency.  
Tune the trans-  
ceiver to an oper-  
ating frequency.  
The microphone  
might not be con-  
nected.  
Make sure the  
microphone is  
connected.  
The antenna might  
not be connected.  
Make sure the  
antenna is con-  
nected.  
The receive mode  
might not be properly  
set.  
Set the receive  
mode to FM, AM,  
LSB, or USB.  
The antenna might  
not be connected.  
Make sure the  
antenna is con-  
nected.  
Trouble with  
transmission.  
The microphone  
might not be con-  
nected.  
Make sure the  
microphone is  
connected.  
The microphone’s  
push–to–talk button  
might not be fully  
pressed in.  
Press the micro-  
phone’s button in  
fully.  
28  
 
Problem  
Possible Causes  
Remedies  
The microphone’s  
gain might not be  
properly set.  
Adjust MIC-G.  
Trouble with  
transmission  
(continued)  
The power cord  
might not be con-  
nected.  
Make sure the  
power cord is con-  
nected.  
Transceiver  
does not work  
at all.  
The power cord’s  
fuse might be blown.  
Replace the fuse  
(see “Replacing  
the Fuse” on Page  
30).  
The transceiver should be serviced only by a qualified radio  
technician. If you still have problems, take your transceiver to a  
local RadioShack store for assistance.  
NOISE REDUCTION  
Because your transceiver is exceptionally quiet, any noise you  
hear is probably from an external source in your vehicle such as  
your vehicle’s alternator, radio, or spark plugs.  
To solve the problem, you must go to the noise's source. You  
can determine the noise's source by turning off the engine and  
operating the transceiver with your vehicle's ignition 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.  
Download from Www.Somanuals.com. All Manuals Search And Downloa2d9.  
• Be sure that the chassis ground connection is secure.  
• Replace old ignition wires with new, high-voltage, noise sup-  
pression wires.  
• Install noise suppressors on your spark plugs, or install new  
spark plugs that have built in noise suppressors.  
• If problems persist, check your alternator/generator and reg-  
ulator gauges. You can reduce the noise from these sources  
by using bypass capacitors at the various output voltage  
points.  
Your local RadioShack store has a wide selection of noise sup-  
pression 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:  
Do not use a fuse with ratings other than those speci-  
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.  
1
4
1
4
3. If the fuse is blown, replace it. Use only a standard 1 / × /  
inch fast-acting fuse with the proper rating. The fuse must  
be 10 amps.  
30  
 
Caution:  
The supplied fuse has the proper ratings. Make  
sure you replace a fuse only with another fuse of the same  
rating.  
4. Reassemble the fuse holder by squeezing it together until it  
snaps shut.  
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
3
41  
64  
16  
64  
Dimensions (HWD) ........................... 6 / × 2 / × 9 / inches  
(154 × 52 × 248 mm)  
Weight (without batteries)................................................. 2.65 lb  
(1.2 kg)  
Accessories ............................ Microphone, Microphone Holder,  
Mounting Hardware, Mounting Bracket,  
DC Power Cord, Spare Fuse  
RECEIVER  
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. Specifica-  
tions are subject to change and improvement without notice.  
33  
 
NOTES  
34  
 
35  
 
Limited Ninety-Day Warranty  
This product is warranted by RadioShack against manufacturing defects in material  
and workmanship under normal use for ninety (90) days from the date of purchase  
from RadioShack company-owned stores and authorized RadioShack franchisees  
and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EX-  
PRESS 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 WAR-  
RANTIES 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 INCON-  
VENIENCE, 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 ex-  
clusion 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 proof of purchase date to any RadioShack store. Ra-  
dioShack 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 similar design; or (c) refund the purchase price. All replaced parts  
and products, and products on which a refund is made, become the property of Ra-  
dioShack. New or reconditioned parts and products may be used in the performance  
of warranty service. Repaired or replaced parts and products are warranted for the  
remainder of the original warranty period. You will be charged for repair or replace-  
ment 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 in-  
structions, improper installation or maintenance, alteration, lightning or other inci-  
dence of excess voltage or current; (b) any repairs other than those provided by a  
RadioShack Authorized Service Facility; (c) consumables such as fuses or batter-  
ies; (d) cosmetic damage; (e) transportation, 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  
12/99  
We Service What We Sell  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
03A00  
Printed in Korea  
 

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