[R-390] R-1981

[rbethman]

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)