[RFI] Tip on approach to, or where to start looking for new noise source

[mstangelo at comcast.net]

Good advice. When you turn off breakers don't forget to turn off any battery backup devices during your investigation.

I had a nagging noise on 60 meters. I turned off all circuit breakers but still had the noise. I turned off the battery backup system I have in the shack and the noise disappeared. I turned on the power and disconnected each power supply connected to the battery backup and isolated the noise to a power supply to our wireless phone. I had to place a Fair Rite 31 toroid on the power cord near the power supply and one at the phone to eliminate the noise.

Mike N2MS


> On 01/01/2023 4:48 AM Hare, Ed, W1RFI <w1rfi at arrl.org> wrote:
> 
>  
> <But, first, exercise your breakers at home and if you can, run your receiver / transceiver on battery power so you can shut off the entire house to start your search.>
> 
> I can't emphasize enough how important this is. Get a battery-operated receiver and connect it to your antenna. Then, flip off all of the breakers in your house.  If the noise goes away, it is you!  If so, turn the breakers back on, one at a time, and note any noise increase. Turn that breaker off (important!) and move on to the next breaker.
> 
> Be on the lookout for devices that may have a backup battery, keeping them "on" when the breaker is off.