[Premium-Rx] Info on Sunair F-1606/U (GSR-921) Pre/Post Selector?

[Corda, Albert J CIV NSWCDD B32]

Hey Guys,
    I just picked one of these pre/post selectors up at a local hamfest.
Seems to cover 2-30 mhz.  I don't know if it would be considered premium
quality, but it does seem to be very well-built, and I am thinking of
using it with my RA6790.   Unfortunately, I haven't been able
to find a thing on it on the web.  I've checked the archives, the
various surplus vendor sites, BAMA and the US Army LOGSA
site, but no luck.  I did happen to find a picture of what may have
been it's companion receiver on the RigPix database (although
the receiver is labeled GSR-920, not 921 as on the Pre/Post selector) ,
but that's just a guess (It looks similar, in that it's rack-mounted,
seems to be the same vintage and size, and both are very very green ;-)

Does anyone have a manual or specs for this critter?  I've put a request
for info in to Sunair, but no response as of yet. I'm a bit curious because
the gentleman who sold me this unit indicated that it had very little/no
gain, but he felt it was still operating correctly since he indicated it had no
internal pre-amp. There is a switch on the front, though, that' is labeled
"gain" with  hi/low positions. I am going to crack it open tonight and take
a look.

Pointers to any info would be greatly appreciated.

-al-
albert.corda at navy.mil


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