[TenTec] Orion 2 noise on some bands

[K3GHH]

Thanks, Cecil. It occurred to me today to try the sub-receiver; it works 
fine --- had a few QSOs using it on 20m CW. Turning back to the Main 
receiver, after again removing the A3 board and Deoxit'ing its terminals 
and cables, full main-receiver capability on all bands is restored. 
Success, I'd say!

But... the problem of encoder noise on 20-10m remains. I Deoxit'd the 
white connectors on the main and sub receiver frequency-tuning encoders, 
on the rear of the front panel, but didn't really expect that to help, 
and it didn't. I get no encoder noise on the sub-receiver, but I get it 
on Main whether using VFO A or VFO B. I also get encoder clicking in the 
main receiver from the PBT/BW, Cut, and RIT/XIT controls.

It's unlikely that I'm the only one who has these clicking encoders. 
Wonder how others have solved the problem.

--John K3GHH

On 05/20/2013 09:54 AM, Cecil wrote:
> 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 at 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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-- 
--- John, K3GHH