[R-390] CV 157 stuff

[Sheldon Daitch]

Voice of America used ISB transmisions for many years for program feeder service prior to going to satellite circuits for all programs.

There were four ISB transmitters at the Greenville NC VOA complex (TMC GPT-10s converted to TMC GPT-40s) and then two Continental ISB transmitters were added.  

Delano had two ISB transmitters, but if memory serves me correctly, the two Continental ISB transmitters added were removed from Delano.

The numerous receiver sites overseas used, in the latter years, RCA SSB-3 ISB diversity receivers. VOA must have had about a hundred of these receivers and typical operation was one program feed on USB, another program feed was on LSB.  The RCA receivers were the later mixed tube-transistorized systems, versions of the fully tubed unit RCA was marketing in the mid-1950s.

Greenville Receiver site had 8 of the RCA receivers for program feeds to Washington, but we also have two older ISB diversity systems, using Racal RA-17 receivers and Pioneer ISB demodulator/diversity combiner systems.  

73
Sheldon
WA4MZZ


________________________________________
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of rbethman <rbethman at comcast.net>
Sent: Friday, February 21, 2014 1:16 AM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] CV 157 stuff

The USAF used to use Independent SSB transmissions.

This was typical of SAC operations.

This may be what they used these for.

Bob - N0DGN


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