[RFI] Finally located my RFI

[Dave (NK7Z)]

I will post shots of it today...  After the service it now looks like I 
would expect an an AC fan to look...

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

On 6/20/24 14:00, David Decoons wrote:
> Thanks for the info. Inquiring minds like to know.
> 
> My friend had wide band noise on several HF bands and 28 MHz was worst. Tracked down to digital LCD display on their high end stove. Company sent a new connecting cable which passed through a ferrite ring. No idea what mix and not multiple passes. I used a pin extractor to take one end apart and used a mix31 and got it wrapped 4 times (most I could do and have cable reach. Knocked the noise from s9+20 to s5.
> 
> My neighbor bought a new washing machine about 3 or 4 years ago. Very distinctive pattern on waterfall on 40 when it started. I am not sociable with them since they wrote the town that I installed an illegal tower when I put up a ground mounted GAP vertical. I just put up with it but could tell what day was laundry day. Then one day it just stopped. Maybe with their family of four kids it broke and they got something different?
> 
> 73 , back in to lurking mode. Learn a lot from reading the emails on the list. One of the most informative lists on the Internet.
> 
> Dave wo2x
> Sent from my iPad
> 
>> On Jun 20, 2024, at 12:51 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>>
>> On 6/20/2024 7:13 AM, Dave (NK7Z) wrote:
>>> Looking at the graphs for impedance on both mix31 and mix43, (I still need to check
>>
>> Dave,
>>
>> Study my material on this. Fair-Rite #31 is the ONLY material I know of suitable for HF suppression, and winding turns is critical. And if you can get inside to get at the wiring, twisted pair is far more likely to make a big dent.
>>
>> k9yc.com/RFI-Ham.pdf
>>
>> 73, Jim K9YC
>>
>>
>>
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