[Milsurplus] Unidentified something

[Sheldon Daitch]

Joe,

The 90A1- ( ) MX is a service channel unit for Collins
microwave radio systems.

The 51B1-MX is an audio amplifier was "used in conjunction
with the Single Sideband Service Channel 90A1-() MX and 
Collins microwave r-f equipment."

I can PDF you the unit instructions on this module.

I also have a setup/adjustment packet and a functional
block diagram for a slightly earlier unit, that I
can send you, if you'd like.

73
Sheldon
WA4MZZ


Joseph Pinner wrote:
> 
> At the Huntsville hamfest, I picked up an older piece of Collins
> commercial or military equipment. It is rack mounted (with an
> interesting hinge which would seem to allow it to be swung out for
> servicing.
> 
> It is modularized and the base is marked 90A1-31MX.
> 
> The modules included are:
> 
>    30A1-3MX with a 455 kc mechanical filter
>    30B1-3MX with a 455 kc mechanical filter
>    62F1-3MX with 455 kc and 415 kc crystal in oven
>    51B1-MX
>    20B1-MX
> 
> Anyone have any data of this unit?
> 
> Joseph Pinner +
> Kingston, TN
> 
> KC5IJD / NN0PPHR
> 
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