Overview

Ameritron HF Power Amplifiers

Ameritron ALS-500M Amplifiers are 500 watt PEP output solid-state linear amplifiers using rugged, conservatively rated, bipolar RF devices in the power output section. ALS-500M amplifiers operate at full power with continuous frequency coverage from 1.8 through 21.6 MHz (160 through 15 meters**). These amplifiers require no tuning adjustments. A broadband 5-pole filter provides output harmonic suppression in excess of 60 dB for all frequencies above 8 MHz and more than 70 dB on all TV channels.

** These amplifiers offer continuous coverage, 1.8 to 22 MHz, with 10 and 12 meters available after installing an optional Modification Kit; valid FCC Amateur license required

ALS-500M amplifiers use two pairs of 2SC2879 transistors operating at 13.8 V nominal in a push-pull output configuration. High quality RF components combine with load fault sensing, temperature protection, and one-switch frequency selection to make this one of the simplest and easiest-to-operate amplifiers today. ALS-500M amps operate on 13.8 Vdc electrical systems and draw a peak current of 80 amperes at full output.

Ameritron ALS-500M Amplifiers feature:

* Instant band switching, no tuning, no warm-up--just turn on and operate, making mobile QSOs safe
* Very compact, fits in nearly any mobile installation and weighs only 7 lbs.
* Extremely quiet low speed, low volume fan stays off and silent until temperature rises
* Output power is 500 watts PEP, 400 watts CW
* Full output with exciter drive less than 100 watts input
* Load fault protection disables and bypasses amplifier if antenna has excessively high reflected power or if band switching is set lower than exciter frequency, virtually eliminates damage because of operating error
* Load fault LED indicator
* Thermal overload LED indicator
* Thermal overload protection disables and bypasses amplifier if temperature is excessively high, automatically resets when temperatures drop to safe level
* Excellent harmonic suppression, multiple section output network, push-pull output circuit has excellent harmonic suppression
* DC current meter lets you monitor collector current
* On/off switch bypasses amplifier for "barefoot" operation without having to disconnect high current power supply cables
* Optional ALS-500RC Remote Control lets you remotely control on/off and band switching functions for out-of-the-way mounting of amplifier
* Power supply requirements, 14 Vdc at 80 amperes peak current for PA transistors and separate line for 14-16 Vdc at 4 amperes for control and bias circuits

Documentation

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