[R-390] More on the R-390 mod question.....

[Tim Shoppa]

Phil writes:
> After looking further, the mod consists of the multi-pin Amphenol
> connector being wired to the board with the 6 top hat diodes
> which are connected to what looks like a position indicating switch
> mounted on the end of the crystal oscillator subchassis.  I am
> guessing that the mod was to provide some kind of remote indication
> of the band switch position.  Anyone heard of anything like this?

Sounds like exactly what would be done to gang the switching of
six octave-wide preselector/pre-amps to a 390A.

I don't know of the part number for such a hypothetical six-octave
preselector/preamp for the 390A. I do know that such gadgets
exist for other brands/series of military/surveillance receivers. I
honestly don't think that they'd be necessary for a 390A, in my
experience with the 390A compared to those other brands/series.

Tim.