Thank you all for the many good suggestions. I will run the line sync and
audio sync tests soon and report my findings to the group.
As of right now the noise seems to have subsided but was present most of the
day (at least whnever I turned the rig on to check). Also note, today was a
little breezy and the breeze is gone now. Maybe a clue - a data entry point
for my log.
Last week we had a day or so of rain and the noise was 40 over on most
bands. It was reduced the following day as we dried out and was totally gone
by the third day. It has been dry the last week so what I captured today was
not due to wet conditions.
I've lived at this house since 91 and have never had noise like this. I was
not very active over the summer so I can't say for sure when it started. It
was not present last winter / spring.
Again, I'll report back with my findings as I get them.
Regards,
Tom
W3TA
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Gary Peterson
Sent: Sunday, September 25, 2016 7:52 PM
To: rfi@contesting.com
Subject: [RFI] Noise - where do I start?
I have also had very good success with doing this. Many oscilloscopes, even
old ones, have the option of using the power line as a horizontal sweep
source.
If LINE is selected for the horizontal sweep and audio from your speaker is
routed to the vertical input, the display may be very telling.
Turn off any noise blanking and watch the interference spikes. If they are
stationary, your noise source is synchronized with your power line
frequency. Possibly a utility company problem.
If the interference spikes drift, it is not likely to be a utility company
problem. More likely a switching power supply or something similar.
Gary
K-zero-CX
"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.73, Jim K9YC"
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