UK/PRC-352

Introduction

The UK/PRC-352 is a UK/PRC-351 with an additional 20 watt amplifier module fitted between the battery and the radio proper. Apart from the amplifier off/band switch the controls and use are the same as for the basic UK/PRC-351, although an external antenna should always be used if the amplifier is in circuit.

History

See UK/PRC-351

Description

For the main radio see UK/PRC-351

The UK/PRC-352 and UK/PRC-352M have an additional AM-352 amplifier clipped between the radio and the battery (with hand charger if present). The amplifier has battery top contacts on its upper surface and radio power studs on its bottom surface and power to the radio passes through the amplifier even if the amplifier itself is switched off.

The AM-352 amplifier has 3 bands and covers 30 to 76MHz. The specified output is 20 watts but most that I have tested achieve 25 to 30 watts on at least some bands.

Overview

For the main radio see UK/PRC-351

Summary Data

Accessories

See UK/PRC-351

Antennas

See UK/PRC-351

Note that the amplifier is intended for use only with external antennas such as EVHF? pineapple, GSA?, and Ground Mounted Monopole?. It is not directly usable with the rigid or flexible whips.

I have been told by former users that it is possible to connect the amplifier output to a SURF-4W with mounted whip antenna (which must be pre-tuned with the amplifier off) and then use the amplifier while on the march. Whether it is good for the amplifier or the operator was not stated!

Technical Description

The ASM-352 is a band switched transistorised power amplifier. Although nominally it covers 30 to 76MHz it does have useful gain on the 28MHz (10M) band and could be used with a QRP 10m radio. It expects a reasonably well matched 50 ohm antenna and is best used with the GSA or inverted V wire antenna (actually a half-Rhombic) or a non-original resonant antenna.

Theory of Operation

To be added

Block Diagram

To be added

Operating

Operation is straightforward. The radio BNC socket is connected to the amplifier input with a 50 ohm BNC patch lead and the amplifier output is connected to the antenna. Turn the amplifier switch to the band in use and use the UK/PRC-351 normally with the benefit of 5-6 times more power (which should at least double the range in flat terrain).

Photos

Links

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