[RFI] Noise location tools

Jim Brown jim at audiosystemsgroup.com
Tue Jan 16 16:06:29 EST 2018

Searching at VHF works if it's impulse noise, but not if it's electronic 
noise. Power lines are the major source of impulse noise; nowadays, much 
(most?) of the noise we hear is electronic noise, and most of that is 
from switching power supplies, solar systems, and variable speed motor 
controllers. That loopstick AM radio IS useful for both, but in 
different ways. When you put it close to an SMPS, you'll hear hash. My 
quick test to confirm whether a wall wart is linear or switching is to 
put the loop in the base of my TH-F6A next to it.

73, Jim K9YC

On 1/16/2018 12:39 PM, Steve Kurtzman wrote:
> An AM radio with its directional bar antenna is helpful to triangulate 
> the area of the interference from different locations.  Then move to 
> higher frequencies if you can still hear it, the higher freq the 
> better, with an HT and handheld yagi to narrow it down (Arrow antennas).
> On Tue, Jan 16, 2018 at 11:53 AM, Jim Brown <jim at audiosystemsgroup.com 
> <mailto:jim at audiosystemsgroup.com>> wrote:
>     On 1/16/2018 11:39 AM, W0MU Mike Fatchett wrote:
>         What are people using for noise sniffing?  I saw the MFJ dish
>         but I try to avoid their stuff.
>     http://k9yc.com/KillingReceiveNoise.pdf
>     <http://k9yc.com/KillingReceiveNoise.pdf>
>     73, Jim K9YC
>     _______________________________________________
>     RFI mailing list
>     RFI at contesting.com <mailto:RFI at contesting.com>
>     http://lists.contesting.com/mailman/listinfo/rfi
>     <http://lists.contesting.com/mailman/listinfo/rfi>
> -- 
> Steve

More information about the RFI mailing list