SR-209 VHF/UHF Receiver

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General Description

The SR-209 is a surveillance receiver covering the VHF/UHF spectrum from 30 - 2000 mc/s. The receivers were built by Astro Communication Labs, Maryland U.S.A., in the mid 1960's. They are fully solid state.

Technical Data

The receivers are made versatile by the fact that various Tuning Heads and a panoramic unit may be chosen to obtain the necessary requirements for a given task. Each receiver is able to accept two heads at a time or one head and a panoramic display. There is also a choice of variable bandwidth IF strips, each receiver having the capacity for 3 internal strips. (The IF frequency is 2l.4 mc/s) IF bandwidths available were 20/60/100/300/500/2000/3000/4000 kc. Available RF Head ranges were 30-l00, 90-300, 250-500, 490-1000, 990-2000 mc/s.

The various plug ins were common to other ACL receivers, such as the SR-219, the receiver selling in Australia for $1378, with the IF strip priced at $1291. (This does not include tuning units or power supply.) This set is very much a down market version of the SR-209.

Noise figure was 4.5 db to 90mc/s, 10db at 500mc/s and l3db at 2000 mcs.

Receiving modes available were AM, FM, CW and PAM. The set uses a carrier operated relay for squelching and recorder triggering.

A calibrated tape dial provides adequate readout for the ranges covered. Electronic fine tuning is used on all heads.

The SDU-102 Signal Display Unit provides a indication of signals present within +/-10 mc/s of centre frequency.

As it is, the set is an interesting monitoring receiver, particularly on the l18-136 mc/s aircraft band, when used with the display adapter.

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© Ian O'Toole, 2009. Page created: 28/04/03 Last updated: 11/12/2009