From your description, it sounds like something in the synthesizer. It is not
immediately apparent what part on the receiver board itself could cause that.
However, I do have a spare sub receiver board you could borrow to try if you
wish. i’d need it back or $100 plus shipping for it.
It’s too bad that the synthesizers in the Orion are not the same. You could try
taking the injection from the main receiver and running it through the L. O.
input of the sub receiver.
If you have a signal generator, you could remove the TMP cable from the L. O.
inputs, one-at-a-time, and set the generator to produce the proper frequency
and amplitude of each. Then see if you can tune in signals by varying the
generator.
Gary
> On Jun 20, 2018, at 6:10 PM, Steven Kline <skline4@verizon.net> wrote:
>
> Has anyone experienced squealing tone in sub-receiver (not 366 type) which
> varies as you rotate vfo. Radio was re-capped and new battery. Have
> performed ram clear and master reset consecutively several times. When
> squealing tone occurs I can turn sub-vfo couple kHz and goes away … then just
> dead air no signal…. go another 5Khz or so and here comes squealing tone
> again. It’s seems to be cyclical. I’m not getting any discernible signals
> since this started last night.
>
> Anyone have thoughts?
>
> Thanks,
> Steve - W5JK
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