Hi Stu,
The only sources I have found that had NO audio signal were lightning
arresters. As other folks have pointed out, you need a "line of sight" to the
source to "hear" it. Sometimes you have to "look" at the pole from multiple
locations to hear the source.
If the source is inside the hardware you won't hear it. All of the sources I
have found that were not inside could be heard from the ground, although a line
sniffer is a big help too. I use both 440 MHz and 675 MHz beam antennas to DF
the sources before using the ultrasonic locator.
Good luck with your hunting.
73,
Alan,
W4LKE
----- Original Message -----
From: Stu Phillips
To: rfi@contesting.com
Sent: Monday, June 07, 2010 3:46 PM
Subject: [RFI] Does a power pole generating RFI always generate ultrasonics?
I'm tracking a power pole near my QTH that is generating RFI from 15m on
up. With a combination of HF and VHF antenna, I'm pretty sure I've
tracked to the correct pole. This pole is generating more of a
"cracking/poping" form of RFI rather than a constant arc like RFI.
I recently built an Ultrasonic detector as an additional tool in my bag
- it seems to work as I can hear tire noise, rubbing fingers, rat
repeller etc... BUT...
When I check out this pole, I can't hear anything ultrasonic wise.
So my question...
Does a power pole generating RFI ALWAYS generate ultrasonics that are
strong enough to be heard from the ground?
Thanks!
Stu K6TU
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|