[RFI] Powerline noise question

[Dave (NK7Z)]

Hi,

I have a set of screen shots of RFI sources at:
https://www.nk7z.net/rfi-snapshots/


But...  You are more interested in WHERE the RFI is coming from, not 
WHAT the RFI.  The WHAT only helps a little in the process...  There is 
no substitute for getting out and DFing the signal...


73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 12/30/22 12:59, Steve Muenich wrote:
> Guys,
> This has been a very enlightening discussion.  And has given me ideas on tracking down my local RFI issue.
> I have a IC-9700 and have been using a 3 element VHF measuring tape yagi to local.  Adding in attenuation using AM as get closer to the source.
> 
> A question I have is:
> Is there any where a location on the web or perhaps at ARRL when similar signatures of various types of noise sources are able to be viewed.
> I haven’t yet looked so this may be redundant but to be able to see a switch mode supply vs a grow light on a waterfall or whatever might help narrow down the search.
> 
> I have a local source that seems to be on a timer and the waterfall shows a squiggly pattern.
> 
> Just a thought.
> 
> Thanks again for all this excellent discussion
> 
> 73
> Steve NA5C
> 
> 
> Sent from my mobile device
> 
>> On Dec 30, 2022, at 2:10 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>>
>> On 12/30/2022 9:58 AM, Hare, Ed, W1RFI wrote:
>>> The SDR waterfall will not be very helpful with power-line noise, but they are great at identifying switching power supply noises and noises that pulse on and off in a regular pattern.
>>> Most of the time, though, we are less concerned with "what is it" as we are with "where is it?"
>>
>> The principle virtues of the waterfall are recognizing whether it's impulse noise or electronic noise; multiple electronic sources and their active hours so that 1) we know when to chase them and 2) when multiple sources are present, help us chase each individually.
>>
>> 73, Jim K9YC
>> _______________________________________________
>> RFI mailing list
>> RFI at contesting.com
>> http://lists.contesting.com/mailman/listinfo/rfi
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi