[Elecraft] Correction P3 Noise Gremlins

[k6rb at baymoon.com]

One of the interesting things about having a panadaptor is being able to
"see" rather than just "hear" what's going on in a small spectral region.
I see all kinds of things racing across the screen, noise-floor bumps,
etc. But, now that I can "see," I'd never willingly give it up. I can find
holes in wall-to-wall contest-related signals to plop down and run Qs, I
can see activity level in a 50 KHz segment of a band and move from signal
to signal instead of slowly tuning through the dead air from one to
another. I hope I never get jaded by it :-).

Rob K6RB


> On 12/4/2011 1:08 PM, Fred Jensen wrote:
>>   A group of very narrow noise pulses, not terribly strong, run
>> through the display at maybe 5 or so KHz/sec, usually from high to low
>> frequency.  I might have heard them once or twice, generally there's no
>> audio indication.  I disconnect my antennas when I'm not using the radio
>> but leaving it on, and I've never seen them then.
>
> Signals like this are quite common here in northern California. I don't
> know their source, don't know if they are intentionally "signals" .or
> unintentionally radiated noise.  I find that I can often hear this stuff
> in my headphones.
>
>>
>> 2.  A more broadband, bump in the reference level runs across the
>> screen, maybe 20-25 KHz/sec, again usually down in frequency but not
>> always.  It's definitely some sort of broadbandish signal coming in on
>> the antenna.  I've never heard anything as it goes by.  I'm about 25 mi
>> from Beale AFB with the PAVE PAWS radar and numerous other electronic
>> systems the USAF never talks about.  I'm a bit suspicious, but it's
>> certainly not a problem.
>
> This sounds like typical trash from electronics equipment and their
> switching power supplies.  Can be anything from battery chargers to 12V
> switching PSUs for low voltage lighting to computers to various
> microprocessor-based equipment of all sorts. The fact that stuff like
> this is not audible is largely due to AGC smoothing out the increased
> noise level when we tune across it.
>
> 73, Jim K9YC
>
>
>
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