The -1B is a rare bird – indeed.įor a Detailed Physical & Operational Description – Click Here or click on the Equipment of Collins Radio on our Home Page and follow the Grey Box trail. The 51S-1B is similar to the 51S-1, but has a rear-mounted junction box that provides military-type connectors for power, control, audio, and antenna lines. The rack-mounted AC version is model 51S-1F, while the rack-mounted DC version is model 51S-1AF. The 51S-1A is similar, except that it is fitted with a 28-volt DC transistorized power supply. The more common models of the 51S-1 are mounted in a perforated wrap-around cabinet and equipped with an AC power supply capable of 115 or 230 volt, single-phase, 50 to 400 Hz operation. Coverage is continuous in thirty 1 megahertz bands. The 51S-1/1A/1F/1AF/1B receiver is designed for USB, LSB, AM, and CW signals in the range of 0.2 to 30.0 MHz. Copyright 2013-2016 Collins Collectors Associationĥ1S-1/1A/1F/1AF/1B RECEIVER – An Overview
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