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Re: [RFI] Ultrasonic Dish

To: Hisashi T Fujinaka <htodd@twofifty.com>
Subject: Re: [RFI] Ultrasonic Dish
From: N1BUG <paul@n1bug.com>
Date: Wed, 02 Jan 2013 18:21:22 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On 01/02/2013 06:08 PM, Hisashi T Fujinaka wrote:

Thanks for all the info. That makes great sense. I've been using an MFJ
RFI detector which gets me in the neighborhood and I need something that
gets me closer. I was considering a hokey ultrasonic detector (I was
going to repurpose a kid's "Spy Ear") or a ~400MHz AM receiver and a
directional antenna at the same frequency.

I use an MFJ-856 (the one with the 3 element beam) as my primary location tool. To make it more useful, I added a 3 step attenuator and modified the unit to get the receiver out of the center of the yagi and clean up the yagi pattern a little. That unit alone gets me to 80% of the poles. In some cases there is still too much ambiguity. I use 445 MHz to resolve most of those down to a single pole. So far I've only found one case where the two units have not led me to a precise pole identification (135 MHz leaves too much ambiguity about which pole it is and 445 MHz hears nothing).

Good luck!

73,
Paul N1BUG
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