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

[Flowertime01 at wmconnect.com]

Phil,

This sounds like more of a preselect and pre amp set up.

The pre amp voltage may have been pulled from the receiver or from a separate 
power supply. Then the multi wire was just used as control lines. 

With one or two used for signal between the pre amps and the receiver. 

It sounds like a one of a kind modification.

See which Megahertz the switch is active on. This will give you some clues as 
to the frequency that was of extra interest to the previous owner.

The receiver may have been used with a VHF or UHF converter that output to 
some frequency in the HF band and the receiver was then used as additional 
conversions.

The diode load to a BNC indicates that some external audio was used also.

The diode may have been modified or by passed and the output on the diode 
load may have been 455Khz to an external FM, SSB or TTY demodulator.

There is a 455KHz output but it may have not matched the add on the prior 
owner was using.

Roger AI4NI

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