Let me try again, perhaps a bit more terse and maybe less
confusing/confused:
Is there a particular circuit, board, or cable I should examine that
would explain (a) normal receive operation on amateur bands below 14 MHz
but (b) extremely high receive noise on bands above 14 MHz?
There must be some signal path that is operative only on 20m-10m. I'm
not knowledgeable enough to identify it.
--John K3GHH
On 05/19/2013 08:26 PM, K3GHH wrote:
I'm encountering problems on wavelengths <30m. Operation seems normal
on 160-30m. A few days ago I had no (well, maybe 4w) transmitter
output on 20m, intermittent output on 17/15/12/10m, and main-tuning
encoder clicking (with each step) on all bands above 10 MHz. I applied
Deoxit to the pins of all circuit boards (and out/in 10 times) and
their cables, and the A&B front panel cables, and that seemed to do
the job. I once again have full power on all bands.
But I also have S9+40 noise (if I'm using the S-meter correctly) on
20m and higher (frequency) bands. No signals can be heard under that.
(With RF Gain = 100, "signal level" is about S=0.5 when 160-30 are
selected; it jumps to +40 to +50 when 20m is chosen and drops to
+30-+40 on 17-10m.)
As a test, I fired up the old Icom 706IIG and immediately worked a
strong VP5 on 14.005 MHz. I put the antenna back on the Orion and
heard the VP5 briefly, but then the noise returned and now nothing is
audible on 20m.
Any suggestions? Wish I hadn't put all of those cabinet screws back in!
--
--- John, K3GHH
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