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Re: [RFI] Re: [TowerTalk] Comment on Radar Engineers Model 240

To: Alan Robinson <robinsah@engr.orst.edu>
Subject: Re: [RFI] Re: [TowerTalk] Comment on Radar Engineers Model 240
From: "Jim White, K4OJ" <k4oj@tampabay.rr.com>
Reply-to: k4oj@tampabay.rr.com
Date: Tue, 12 Aug 2003 09:36:27 -0400
List-post: <mailto:towertalk@contesting.com>
If there is anyone in Florida who has these units, please contact me - thanks


Jim, K4OJ

near Tampa

Alan Robinson wrote:
Hi Tod, K0TO,

I have a Radar Engineers Model 240 which I use for locating noise sources on
power lines. I highly recommend it. I also have a Radar Engineers Model 250
Ultrasonic Locator. The combination can not only find the offending pole, but
usually I can pick out the noise making hardware while remaining on the ground.

I like to use my Tektronix Model TDS-210 Oscilloscope with the 240, larger
display and easier to see. I run the scope off of an Astron Model Pi-250W power
inverter. It has a remarkably accurate crystal controlled frequency. This allows
synchronization with the power line frequency.

Normally I use a two or three element beam on 144 MHz to locate the "suspect"
pole with the 240, then I use a 440 MHz 6 element yagi to verify the pole, and
finally I use the 250 to pick out the hardware item on the pole. The Model 240
really is an outstanding piece of equipment, as is the 250.

You can read a story I wrote about my locating experience in Marv Loftness' new
edition of his AC Power Interference Handbook, available from the ARRL. Marv's
book is a "must read" for information on how to locate power line noise sources.

I hope this helps you. If you have any questions, but email me.

Sincerely, and 73s,

Alan, W4LKE

See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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