RadioShack HTA-20 Owner Manual
RADIO SHACK LIMITED WARRANTY
This product is warranted against defects for 1 year from date of pruchase
from Rad.io Shack company-owned stores and authorized Radio Shack
franchisees and dealers. Within this period, we will repair it without charge for
parts and labor. Simply bring your Radio Shack sales slip as proof of
purchase date to any Radio Shack store. Warranty does not cover
transportation costs. Nor does it cover a product subjected to misuse or
accidental damage.
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Some states do not permit limitation or exclusion of implied warranties;
therefore, the aforesaid Iimitation(s) or exclusion(s) may not apply to the
purchaser.
This warranty gives you specific legal rights and you may also havo othar rights which
vary from state to state.
We Service What We Sell
Cat. No. 19-1122
OWNER'S MANUAL
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RADIO SHACK
A Division of Tandy Corporation
Fort Worth, Texas 76102
Printed in Korea
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FEATURES
Your Radio Shack HTA-20 VHF Amplifier with RX Pre-
Amplifier is a high-power, filtered VHF band amplifier
designed for use with transceivers in the 144 - 148 MHz
FM frequency band. When your transceiver transmits, the
amplifier amplifies the transmitted power.
Its features include:
Bipolar Transistor High Power Amplifier - increases a
normal transceiver's output power from 0.5 - 5 Watts up to
30 Watts.
Double Tuned Helical Band Pass Filter - reduces out-
of-band interference by allowing the received frequencies
in the 144 - 148 MHz band to easily enter the receiver but
attenuating all other frequencies.
Low Noise GaAs Field Effect Transistor (FET) Pre-
Amplifier - normalizes insertion loss and provides clean
received signal gain.
Note: This amplifier is designed to be used only with a
high-power antenna.
CONTENTS
Preparation 4
Mounting the Amplifier 4
Installing an Antenna 6
Making the Connections 7
Matching the Antenna's Standing
Wave Radio (SWR) 11
Operation 13
Troubleshooting 14
Maintenance 16
Caring for Your HTA-20 16
Replacing the Fuse 17
Specifications 18
© 1994 Tandy Corporation.
All Rights Reserved.
Radio Shack is a registered trademark used by Tandy Corporation.
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PREPARATION
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The most common place to mount an amplifier is under a
vehicle's dashboard. Choose a specific location where:
• You can easily reach the amplifier.
• The amplifier's wires and RF cables reach their con-
nection points and do not interfere with any of the vehi-
cle's moving parts.
• The amplifier is not directly in front of air vents.
MOUNTING THE AMPLIFIER
Warning: Mount the amplifier securely to avoid damage
to the amplifier or vehicle and to prevent injury to anyone
in the vehicle during sudden starts or stops.
Follow these steps to mount the amplifier.
1. Mark the positions for the screw holes using the supplied
mounting bracket as a template.
2. Drill the screw holes into the mounting surface at each
marked locations.
Caution: Be sure you do not drill into electrical wires
behind the mounting surface or into any of your
vehicle's moving parts.
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3. Attach the mounting bracket to the mounting surface
using a Phillips screwdriver and the supplied mounting
screws and washers.
4. Attach the amplifier to the mounting bracket with the
supplied mounting knobs.
Note: The mounting knobs are large and slotted so
you can easily tighten them with either your fingers or
a large flat-blade screwdriver. Do not over-tighten.
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