[R-390] R-390A Variant

Wed, 6 Aug 2003 11:49:50 -0400

Byron,

Your receiver is an R-1247/GRC-129 Receiver,  modified from the R-390A by
Manson Labs.

This equipment was part of  the AN/GRC-129  system which had 2 R-1247
receivers for dual diversity. The 2 receivers had the CV-1694/GRC-129 Single
Sideband Converter, (Manson Labs) connected to them, The CV-1693/GRC-129 is
the 1 MHz step synthesizer and the O-1203/GRC-129 is the 1 KHz step
synthesizer locked to the same frequency standard. With the 2 synthesizers
the receiver is tunable within its normal frequency range in 1 KHz steps.
The frequency still has to be dialed in the receiver, because the RF stages
and mixers have to be peaked up at the frequency of operation. The receiver
can be operated normally, too. Both synthesizers and the converter were
built by Manson Labs,  but the synthesizers  were also made under contract
by Hallicrafters, in their last throes of death...

The system transmitter was the modified (for sideband) T-368, under the
nomenclature T-946/GRC-129, driven by the
O-1555/URC  synthesizer.

73, Meir WF2U
Landrum, SC

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Byron Tatum
Sent: Tuesday, August 05, 2003 11:08 PM
To: [email protected]
Subject: [R-390] R-390A Variant

Hello-
    I recently obtained a variant of the R-390A of which small  relays were
installed on modules and 3 osc. output / inputs were available at a rear
panel plate, equipped with 3 BNC conn.and terminals to energize the relays.
The front panel tag is missing and I cannot recall the ID number of this
set. I believe this one is an all Collins made unit, and it is only the
second of this type that I have seen.About 8 years ago I dis-assembled one
of these, it was an all Collins module and mainframe set, however the
modification was done by another contractor.The front panel ID tag reflected
a new type number.
    I would be interested in trading this set for a late model { preferably
EAC} if anyone is interested.It is complete with covers and meters.
    Thank you, Byron WA5THJ.

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