[R-390] CV 157 stuff

[Lester Veenstra]

And these ckts had FDM FSK channels above the program audio, carrying
unencrypted admin traffic, from HQ, out to the HF relay sites. 


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Sheldon Daitch
Sent: Friday, February 21, 2014 4:33 AM
To: rbethman; r-390 at mailman.qth.net
Subject: Re: [R-390] CV 157 stuff

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


O
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