That close in unit might be a Radar Engineers device. They make both that
style and the parabola UT devices. UE Systems also makes a very nice
commercial UT device. The dishes are not much more than 12-15" wide, and
can easily discern noisy hardware up to 100ft or more.
The parabola style allows an electronics or telecomm tech to investigate,
verify and search for the noise on a pole after tracking to the pole using
RF noise rcvrs. Then the lineman comes out and uses the close-in device to
verify what the tech found from the ground, and any other possible problems.
It's a matter of using the properly qualified people to do their specialized
work. Linemen don't understand RF transmission propagation theory, while
electronic technicians don't climb poles even in bucket trucks.
Now add to all that a storage scope to record the noise signature like
Mike-K3RFI teaches (QST just ran an article on this method earlier this
year), and you have a good RFI team. Ya just hope mgmt stays out of the way
after that.
73, de ed -K0iL
-----Original Message-----
From: rfi-bounces@contesting.com On Behalf Of Roger D Johnson
The point I was trying to make is that I don't know if an
ultrasound unit on the ground would be any advantage over
our conventional VHF/UHF localization methods. The offending
pole is relatively easy to find. The trick is to find out
just what hardware on the pole is causing the problem! The
small ultrasound unit, operating at short range, seems to do
a very good job. I don't know what brand of device the power
company was using but I'm sure it has to be relatively
expensive as it would have to be certified for the voltages
involved.
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