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

Jim White, K4OJ k4oj at tampabay.rr.com
Tue Aug 12 10:36:27 EDT 2003

If there is anyone in Florida who has these units, please contact me - 


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
> _______________________________________________
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