Radio Shack HTX-252 Manual de usuario

Cat. No. 19-1127

OWNER’S MANUAL

Please read before using this equipment.

HTX-252

2–Meter Amateur

FM Mobile Transceiver

FEATURES

Your RadioShack HTX-252 2–Meter FM Mobile Transceiver is a

compact and versatile transceiver, perfect either in your vehicle

or in your home. Vehicle cables and mounting hardware are sup-

plied. Add an optional base-station antenna, cable, and a power

supply to make it your home transceiver. It is an all-around ideal

choice for your amateur communications needs.

Note: You must have a Technician Class or higher Amateur Ra-

dio Operator’s License and a call sign issued by the FCC to legal-

ly transmit using this transceiver. Transmitting without a license

carries heavy penalties. Getting a license is easier than ever. See

“Introduction to Amateur Radio” on Page 7 for more information.

Here are some of your transceiver’s features.

High (25 Watt) and Low (10 Watt) Power Settings — let you se-

lect the best power setting according to communication guide-

lines.

10 Memory Channels and 1 Call Channel — let you store up to

10 frequencies for quick access along with other settings such as

the repeater offset and the CTCSS tones.

Frequency Range of 144–148 MHz (TX) and 136–174 MHz

(RX) —provide flexibility and excellent wide coverage. You can

also extend the transmit frequency range to 142.00–

149.885MHz.

Channel Up/Down and 16-Key DTMF on the Mic — lets you

manually send DTMF (Dual-Tone, Multiple Frequency) tones to

quickly access DTMF-access repeaters, autopatches, or other

stations equipped with a DTMF page feature.

CTCSS (Continuous Tone Coded Squelch System) Subaudible

Tone — both encodes and decodes 38 subaudible tones to help

reduce interference from other nearby systems operating on the

same frequency.

RadioShack is a registered trademark used by Tandy Corporation.

Programmable Frequency Step — lets you set the frequency

step for tuning or scanning to 5, 10, 12.5, 15, 20, 25 kHz.

Signal Strength Indicator — a graduated bar shows the relative

strength of the received signal and transmitting signal.

Digital Phase-Locked Loop (PLL) Frequency Synthesizer —

provides highly accurate and stable tuning.

Built-In Automatic Modulation Control — ensures a constant

RF modulation level.

Repeater Offset — lets you select the appropriate offset value to

match a local repeater.

Scan — the transceiver scans the frequency range and the mem-

ory locations for transmissions.

Rotary Tuning — lets you reach a desired frequency quickly and

accurately.

External Speaker Jack — lets you connect an optional external

speaker for more flexible operation.

Illuminated Digital Display — clearly shows the frequency, the

functions, and the signal strength.

Key Lock — lets you lock the transceiver’s keys to prevent acci-

dentally changing settings.

MANUAL CONVENTIONS

Some of your transceiver’s controls perform multiple functions.

The abbreviation or symbol for a function is printed on, or above

each multi-function button.

To activate certain transceiver features, you must press F (func-

tion) and then another button. Those key combination instruc-

tions are printed as the first button name, +, then the second

button name. For example, F+LOCK means press Fthen press

LOCK.

Control names are printed in small, bold, capital letters such as

CALL or VFO. Words, symbols, and numbers that appear on the

display are printed using a distinctive typeface, such as 146.94

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.

CONTENTS

Introduction to Amateur Radio ............................................. 7

Preparation ............................................................................. 9

Attaching the Microphone Holder ..................................... 9

Mounting the Transceiver ................................................. 9

Connecting an Antenna ................................................... 11

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

Using an External Speaker ............................................. 12

Connecting Power .......................................................... 13

Using the Transceiver as a Base Station ........................ 13

A Quick Look at the Controls ............................................. 15

A Quick Look at the Display ............................................... 18

Operation .............................................................................. 19

Turning the Transceiver On and Off ................................ 19

Selecting Frequencies .................................................... 19

Receiving Transmissions ................................................ 20

Transmitting .................................................................... 20

Understanding Repeaters ................................................... 22

Setting the Repeater Offset Frequency .......................... 23

Setting the Repeater Offset Direction ............................. 23

Reversing the Transmit and Receive Frequencies ......... 24

Memory Operation ............................................................... 25

Storing a Transmit/Receive Frequency ........................... 25

Recalling Memories ........................................................ 25

Using the Calling-Frequency Memory ............................ 26

Scanning Operation ............................................................. 27

Scanning for Active Frequencies .................................... 27

Scanning Standard Memory Locations ........................... 27

Continuous Tone Coded Squelch System Features ......... 28

Temporarily Opening Squelch ......................................... 28

Using DTMF Tones ............................................................... 30

Other Special features ......................................................... 31

Using Priority Frequency Monitor .................................... 31

Using VFO Priority ................................................... 31

Using Memory Priority .............................................. 31

Changing the Transmit Frequency Range ...................... 32

Selecting the Transmit Power Level ................................ 32

Locking the Keypad ......................................................... 32

Turning the Key Tone On and Off .................................... 33

Setting the Frequency Step ............................................. 33

Reducing Interference ..................................................... 33

Troubleshooting ................................................................... 35

Care and Maintenance ......................................................... 36

Resetting the Transceiver ............................................... 37

Replacing the In-Line Fuse ............................................. 37

Specifications ....................................................................... 38

INTRODUCTION TO AMATEUR RADIO

This 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. This

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

http://www.arrl.org

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

other study aids available. Your local RadioShack store sells

FCC

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 this transceiver to

communicate directly with other operators, and use repeaters for

distant 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!

PREPARATION

ATTACHING THE

MICROPHONE HOLDER

Follow these steps to attach the

microphone holder to your vehicle.

1. Using the holder as a tem-

plate, mark the position for the

mounting screw holes at the

desired location.

2. At each marked position, drill

a hole slightly smaller than the

supplied mounting screw.

Caution: Be careful not to drill

into anything behind the

mounting surface.

3. Use a Phillips screwdriver to attach the holder to the mount-

ing location with the supplied small self-tapping sheet metal

screws and lock-washers.

MOUNTING THE TRANSCEIVER

The most common mounting location for this transceiver is under

a vehicle’s dashboard. However, if you plan to use the transceiver

as a base station, you can place it on a desk, shelf, or table (see

“Using the Transceiver as a Base Station” on Page 13).

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

Caution: If you use the transceiver in a vehicle, mount it securely

to avoid damage to the transceiver or vehicle, or injury to anyone

in the vehicle during sudden starts or stops.

Follow these steps to mount the transceiver.

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 self-tapping screws.

Caution: Be care not to drill into objects behind the mount-

ing surface.

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

the mounting surface with the supplied mounting screws

and flat washers.

4. Attach the transceiver to the mounting bracket using the

supplied rubber washers and mounting knobs.

VOL

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