Your question is clear...I'm not in front of any service information on the
radio so I can't specifically answer your question. If it were mine my next
step would be to pull all the covers and do a visual inspection of each
connector to be sure the pins ended up back where they should have
been...sometimes it is easy to get them mis-aligned. Then I would power up the
radio...put it on one of the upper bands and using an insulated tuning tool
push around on each connector a bit and see if you can find one that seems to
effect the symptoms.
It's always where I start..
Cecil
K5DL
Sent from my iPad
On May 20, 2013, at 8:38 AM, K3GHH <k3ghh@arrl.net> wrote:
> 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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