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Review: The “New” Ameritron ALS-600 600-Watt HF Power Amplifier

Phil Salas – AD5X

Introduction

The compact and light-weight ALS-600 solid-state amplifier has been around for many

years. Using four Motorola MRF-150 TMOS FETs operating at 50 volts, the ALS-600

provides 600 watts PEP SSB, 500 watts CW typical output power from 160-10 meters. It

is simple to use (no tuning required), effective (only 4dB down from full legal limit), and

reasonably priced. Internal protection circuits automatically protect the ALS-600 from

improper operation, high SWR, or high heat-sink temperature. The ALC interface can be

customized for any transceiver through a rear-panel adjustment control. Finally, accurate

cross-needle meters read SWR/Peak Power on the amplifier, and voltage/current on the

power supply. Now while the ALS-600 provides your basic amplifier features, new

solid-state amplifiers on the market are offering additional features that many hams want.

The “new” ALS-600 Amplifier

Ameritron’s solution to the competition has been to quietly evolve the ALS-600 with

small changes so options can be added for those who want them, while keeping the basic

amplifier cost low for those who don’t need the additional features. First, Ameritron

introduced a switching power supply option. As the ALS-600 consists of separate

amplifier and power supply units, you can easily select either the less expensive linear

power supply or the light-weight switching power supply. The switching power supply is

1/3

the weight of the linear power supply, making it attractive for portable operation.

The most recent change to the ALS-600 (Serial Numbers 14378 and higher) adds remote

control and automatic transceiver band-change capability using either the ALS-500RC

Remote Control Head, or the ARI-500 Automatic Band Switch – or both! These units

were originally designed for use with the ALS-500M mobile amplifier, as this mobile

amplifier is normally mounted remotely from the transceiver. Now these units also

interface with the ALS-600 via a pair of amplifier front panel RJ45 jacks. ALS-600

amplifiers with lower serial numbers can be factory upgraded. Contact Ameritron for

pricing. So - let’s take a look at each of these new optional control units.

Photo A: RJ45 jacks (upper right) provide Photo B: New relay-switched low pass

optional remote control capability. filter board permits remote band switching.

1 2 3 4 5 6

Résumé du contenu

Page 1

Review: The “New” Ameritron ALS-600 600-Watt HF Power Amplifier Phil Salas – AD5X Introduction The compact and light-weight ALS-600 solid-state ampl

Page 2

ALS-500RC Remote Control Head The ALS-500RC allows you to remotely mount your ALS-600, yet still have access to the amplifier’s frequency switch and f

Page 3

Let’s Fire-Up the ALS-600 with all the options The ALS-600 power supply comes wired for 120VAC operation so it is ready to plug into your wall outlet.

Page 4

using a long peak-hold wattmeter setting on voice while saying “hellooooo test one two three four”. I adjusted the transmitter drive while sending “d

Page 5

Conclusion The compact Ameritron ALS-600 solid-state amplifier Ameritron, now with remote control and automatic band changing options, is a very affo

Page 6

Note: The last photo shows a highly modified ARI-500 that is the subject of another article. In order to use this interface unit, strap the ARI-500

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