[RFI] Yagis and DFing

[Dave (NK7Z)]

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 at contesting.com> on behalf of Pete Smith N4ZR <pete.n4zr at gmail.com>
> Sent: Saturday, December 31, 2022 8:03 AM
> To: rfi at contesting.com <rfi at 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 at 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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>>
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