[RFI] Fwd: Power Line Noise

[Dave (NK7Z)]

You took the words from my mouth Jim...  I was going to suggest just that.

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


On 12/30/24 14:43, Jim Brown wrote:
> Given the aural analysis from other experts Mike Martin and David 
> Eckhardt (I don't remember seeing a file posted, only a screen shot), 
> this is great advice.
>
> I'll add a specific method I use for impulse noise here in the Santa 
> Cruz Mountains, where homes are a bit spread out. My mobile VHF/UHF FM 
> rigs and talkies have wideband RX from below the AM BC band to about 
> 560 MHz, with the options of SSB and AM detectors. I have both the 
> mobile rig and the talkie programmed for 160 MHz, 300 MHz, 400 MHz, 
> and the highest freq it will tune.
>
> I drive around tuned to 160 MHz; as the signal gets stronger, I move 
> up in frequency. When it's loud at the highest frequency, I get out of 
> the car with the talkie, first with a duck and the talkie held tight 
> against my belly, turning it into a half-space antenna. As I get 
> closer, I remove the duck. And so on. I learned the talkie against the 
> belly trick from our Chicago club's annual fox hunts, and one year won 
> using only that.
>
> 73, Jim K9YC
>
> On 12/30/2024 1:34 PM, Alan Higbie wrote:
>> Perhaps it fades off higher in the band (in the phone portion) 
>> because your
>> antenna is more responsive down in the CW segment?
>>
>> Do you know what direction it's coming from? Try peaking it with your 
>> beam.
>> It may be a sharper peak on higher band - like 10 meters.  I'd also try
>> using your 6 meter and 2 meter beams to do the same in that direction 
>> for
>> possibly even sharper peak. (set to receive on AM)
>>
>> Then take a handheld VHF /  UHF radio (on AM) and walk out in that
>> direction until you find the pole where it is strongest.  That may 
>> provide
>> some further clues as to exactly which pole is the source. After all 
>> . . .
>> there is some specific source out there causing the problem.
>>
>> Knowing which pole is the source, will help your power company crew 
>> fix it
>> faster.
>>
>> Please keep us posted.  That way, we all benefit.
>>
>> 73,
>>
>> ~ Alan K0AV
>
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi