Alan,
Nice setup! Thanks for sharing, now lets apply that to Amateur Radio!
Imagine a network of hams, all with low band rigs all slaved to the same
frequency, and all phase coherent, all reporting RFI signal arrival
times to a cloud... Now take that data, and treat it just like
SHOTWATCH does for location of source... Arrival time trilateration
could pin a source in real time to a location...
Oh well... Not in my lifetime...
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 07:38, Alan Higbie wrote:
While we are daydreaming about locating RFI sources with drones - here
is more food for thought:
https://www.modernpowersystems.com/features/featurepotential-game-changer-finding-imminent-power-line-faults-before-they-happen-8025876/
<https://www.modernpowersystems.com/features/featurepotential-game-changer-finding-imminent-power-line-faults-before-they-happen-8025876/>
I am thinking this might be something like the sensors & algorithm
system which allows for lightning detection.
Blitzortung.org
~ Alan K0AV
On Sat, Dec 31, 2022 at 8:03 AM Dave (NK7Z) <dave@nk7z.net
<mailto:dave@nk7z.net>> wrote:
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 <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
<mailto:arrl.org@contesting.com>> on behalf of Pete Smith N4ZR
<pete.n4zr@gmail.com <mailto:pete.n4zr@gmail.com>>
> Sent: Saturday, December 31, 2022 8:03 AM
> To: rfi@contesting.com <mailto:rfi@contesting.com>
<rfi@contesting.com <mailto: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 <mailto: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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>>> http://lists.contesting.com/mailman/listinfo/rfi
<http://lists.contesting.com/mailman/listinfo/rfi>
>>>
>>
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