[RFI] external noise source identification

[Dave Cole (NK7Z)]

https://www.nk7z.net/sdr-rfi-survey-p1/

Link to part II is at the bottom of part I

73s and thanks,
Dave (NK7Z/NNR0DC)
https://www.nk7z.net
Award Manager, 30MDG Grid Contest
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 12/21/18 4:03 PM, Jim Brown wrote:
> On 12/21/2018 2:19 PM, bill K7WXW wrote:
>> 015 K7WXW RFI 122118-3 (5MHz sweep, centered at 4.05MHz)
>>     - 130' doublet (main antenna, power off, fiber power on)
>> 016 K7WXW RFI 122118-3 (5MHz sweep, centered at 4.05MHz)
>>     - 130' doublet (main antenna, power off, fiber power off) 
> 
> If it's there all the time, I'd suspect  CATV or DSL backhaul 
> transmissions. If it's switched on and off and the pattern changes 
> occasionally (because the TV is reproducing different DTV formats), 
> maybe a Plasma TV. There's a discussion of both in the "chasing RFI" app 
> note I wrote several years ago.
> 
> http://k9yc.com/KillingReceiveNoise.pdf
> 
> This might be a good use for NK7Z's long slow waterfall pictures. See 
> his website -- it's a real treasure trove!
> 
> 73, Jim K9YC
> 
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