Topband: Nasty QRM From ??

[GGLL]

	The fact that it is frequency stable, not drifty, rings me a bell.

SMPS noise is drifty.

Perhaps after shutting down the house-mains and with a portable receiver 
with ferrite bar antenna (MW band tuned, so you can estimate where the 
noise come from, although you'll get two directions), will help to track 
the source.

Regards
Guillermo - LU5WE.



El 24/1/20 a las 12:40, August "Gus" Hansen escribi�:
> On 1/23/2020 11:59 PM, Dick Bingham wrote:
>> ...
>> These signals are frequency stable and not drifty. Shutting down the
>> house-mains with the receiver battery powered does not kill the QRM.
>>
>> SO, it looks like something somewhere is generating this junk that 
>> runs from
>> the BC-band to >20MHz.
> 
> Shutting the main power off won't stop cable modems and routers from 
> operating if they have battery backup. Some of these devices can be 
> quite noisy. Also, do you have any UPS units keeping other equipment 
> alive during power outages?
> 
> Good luck,
> Gus Hansen
> KB0YH
> 
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