[R-390] R-1981

[Les Locklear]

I think the one your are thinking of was the R-1247 for NASA. The R-725 
was used in DF work.

Les Locklear
Gulfport, Ms.
DX'ing Since '57








----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Tisha Hayes" <tisha.hayes at gmail.com>
Cc: <r-390 at mailman.qth.net>
Sent: Tuesday, February 22, 2011 11:26 AM
Subject: Re: [R-390] R-1981


: This sounds VERY much like the R-725 (?), that NASA used for
: communications during the Apollo era.
:
: Much of the external equipment was made by Manson Labs.
:
: Bob - N0DGN
:
: On 2/22/2011 12:17 PM, Tisha Hayes wrote:
: > <SNIP>
: >
: > When I get it in the lab, I'll take pics and post them on my web 
page. I am
: > fortunate that this example is in very good shape, possibly an 8 on 
the 10
: > point scale.
: > Any other info would be greatly appreciated."
: >
: > Maybe some of this was for a DF setup or potentially some sort of 
doppler
: > correction scheme of the Air Force or NASA for satellite reception.
: >
: > As we know, our beloved mechanical filter setup does not lend itself 
well to
: > certain DF applications (interferometry).
: >
: > As has been mentioned, maybe the high stability option (17 MHz osc) 
was part
: > of a requirement for high speed data reception. Locking the receiver 
to a
: > NIST traceable or disciplined oscillator or some type. It seems that 
the
: > inherent instability of the other crystals might make that a 
challenge.
: > (when we are counting ppm's)
:
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