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Re: [RFI] Yagis and DFing

To: rfi@contesting.com
Subject: Re: [RFI] Yagis and DFing
From: "Dave (NK7Z)" <dave@nk7z.net>
Date: Sat, 31 Dec 2022 07:03:44 -0800
List-post: <mailto:rfi@contesting.com>
Ed,
I was board one day a few years ago, and took out with my mobile rig, and its rear mounted vertical... I plotted signal strength points all around a known RFI source to see if an isoline map might help locate a hard to find source... It actually did indicate the area for the source quite accurately... One of these days, I will actually use that process in a locate...

I have this dream of a drone, a computer, more programming experience, and money than I currently have... Wouldn't it be cool to just let a drone off, have it grid up an area, take signal strength readings at a set altitude, then have a computer take the results and create either a heat map, or an isoline map...

Anyway, someday I may tackle that project but not soon...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 12/31/22 06:40, Hare, Ed, W1RFI wrote:
If you are trying to locate a noise source, if a directional antenna is 
available at the ham's QTH, that is the place to start. It will give a general 
direction for that walk-around.
________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> on behalf of Pete Smith N4ZR 
<pete.n4zr@gmail.com>
Sent: Saturday, December 31, 2022 8:03 AM
To: rfi@contesting.com <rfi@contesting.com>
Subject: Re: [RFI] Yagis and DFing

Or use a Moxon which has a deep null off the center of the back

73, Pete N4ZR

On 12/30/2022 7:19 PM, David Eckhardt wrote:
Use the sharp *nulls off the sides* of the Yagi.  They are far sharper than
the "gainy" front lobe.

Dave - WØLEV

On Sat, Dec 31, 2022 at 12:01 AM Jim Brown<jim@audiosystemsgroup.com>
wrote:

Remember that Yagis only have their intended directivity in the
frequency range for which they are built.

73, Jim K9YC
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