[Elecraft] Correction P3 Noise Gremlins

[Vic K2VCO]

I have to agree. It's interesting to see how what I formerly thought was 'just QRN' is 
sometimes a localized (in frequency) burst of RF. There are all kinds of phenomena that I 
had no idea existed which have become visible. It's also helpful to identify the stations 
with key clicks -- maybe I should apply for an OO appointment so I can send notices to 
these guys! The P3 has added so much to my enjoyment, not to mention my ability to spot 
and break through pileups. I recently obtained a 23" monitor that I intend to use for the 
P3 display as soon as the VGA output becomes available.

On 12/5/2011 8:49 AM, k6rb at baymoon.com wrote:
> 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
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/