Mark Frank Guillermo and Jerry,Thank you all for the great ideas. Looks like I
have my work cut out for me. I think it's coming from the south. My South
Beverage picks it up the strongest North Beverage still strong but little
weaker. On 40m I have 2 full wave loops and the n/s loop picks it up very
strong. My neighbors already think I'm crazy. So it's really going to be crazy
around here when I walk around the streets with a 4' loop. Thanks 73 Fred
KB4QZH
-------- Original message --------From: K4SAV <RadioXX@charter.net> Date:
6/25/20 3:10 PM (GMT-05:00) To: topband@contesting.com Subject: Re: Topband:
RFI Power pole noise can be difficult to find with a portable receiver that is
not directional. It's also difficult to find when all you have is an
ultrasonic detector because those have to be pointed right at the source to
hear anything.. Power lines make a good antenna for radiating power pole
noise. Often the wires act like a long wire antenna and that can sent the
noise for a long distance in the direction the line runs. My record for that
with S9 noise at home on 160 has been 3 miles to the source. The source was
very big.To get started searching in the right direction try locating the
direction with a rotatable antenna from home. A 6 meter Yagi does well
usually. Then when you head off in the right direction, you need an AM receiver
with a directional antenna, something like the MFJ-856 which is a 135 MHz AM
receiver with a 3 element Yagi. That will get you within a pole or two. Other
receivers can work too but it really needs to be on AM. Then an ultrasonic
detector can be used to identify the part on the pole that is the source. I use
a homebrew one but MFJ also makes one, the MFJ-5008.After you think you have
found the source, try to verify its characteristics with what you are hearing
at home. You don't want to send the power company to fix something that is not
your problem. I often find lots of noise sources that I don't hear at
home.Jerry, K4SAV_________________Searchable Archives:
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