[RFI] Noise - where do I start?

[Jim Brown]

On Sun,9/25/2016 5:56 AM, thoyer wrote:
> Haven't been active much of the summer. In the recent weeks I started
> noticing a very broad band noise.

Here's a "how to start AND finish.

http://k9yc.com/KillingReceiveNoise.pdf

One thing I strongly suggest is that you either try to get that spectrum 
display into averaging mode or find another spectrum display that allows 
you to do that.

Another thing would be look at the audio on a scope and try to sync it 
to 60 Hz. If it syncs to 60 Hz, there's a good chance that it's power 
line noise. Also, save the audio as a sound file and look at it on an 
audio spectrum analyzer. Audacity has a nice one, and it's freeware. Use 
Audacity to record the audio as a file, then save it and look at it.

73, Jim K9YC