North of what?
-------- Original message --------From: Mark Radabaugh <[email protected]> Date:
8/19/20 2:33 PM (GMT-05:00) To: [email protected] Subject: [Ohio] Fwd: TDWR
Interference Investigation This is a better example of the noise that the radar
at Columbus is seeing. It’s actually a bit farther north than was previously
described:MarkBegin forwarded message:From: Albert Furlow
<[email protected]>Subject: RE: [Ohio] TDWR Interference InvestigationDate:
August 19, 2020 at 2:24:08 PM EDTTo: Mark Radabaugh <[email protected]>
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Regards,Albert Furlow Electronics EngineerColumbia Field OfficeFCC Enforcement
[email protected] Office202-391-1847 Cell
From: Mark Radabaugh <[email protected]>
Sent: Wednesday, August 19, 2020 2:21 PM
To: Albert Furlow <[email protected]>
Subject: Fwd: [Ohio] TDWR Interference Investigation
Begin forwarded message:
From:
Mark Radabaugh <[email protected]>
Subject: Re: [Ohio] TDWR Interference Investigation
Date:
August 19, 2020 at 2:18:46 PM EDT
To:
[email protected]
Cc:
[email protected]
Reply-To:
[email protected]
As head of the policy committee I would like to emphasize how serious this
matter is. THIS IS VERY IMPORTANT that this interference be found and stopped!
About 4 years ago WISP’s came VERY close to losing high power operation in the
entire lower half of the UNI-III band when the FAA went to the NTIA who went to
the FCC to deal with interference to the terminal dopler weather radar system.
This system is used to warn aircraft of wind shear during takeoff and
landing. The proposed rules greatly tightened the out of band limits at the
edge of the UNI-III 5720Mhz-5850Mhz to the point that very few manufacturers
would be able to build a radio
at a reasonable cost to operate outdoors.
WISP’s came very close to losing one of our best tools due to this issue. We
narrowly avoided it with considerable effort from WISPA, many manufacturers,
and many WISP’s. Credit is also due to Ubiquiti for the compromise proposal
that
the FCC ultimately accepted.
None of us can afford further black eyes over interference with TDWR. If you
are operating between 5600 and 5650Mhz please make sure you are following the
rules on operation in the DFS space, are operating at appropriate power levels,
and are not aiming at TDWR sites.
This appears to be more than 60 miles out. This is the best map of the
interference that I have been able to find to date. I added the red line
showing the interference direction:
Please check your systems to make sure they are not the source of this
interference!
As an added incentive - if and when the FCC tracks the interference down the
minimum fine starts at $20,000 and goes up. And as an added bonus you are
presumed guilty and have to spend a bunch of money on lawyers to defend
yourself.
You also end up with a ‘compliance plan’ that involves a whole lot of
reporting and other fun for years to come.
Mark Radabaugh
WISPA
On Aug 19, 2020, at 11:48 AM, Todd Harpest <[email protected]> wrote:
Ohio WISPs:
We received an email from the Ohio contact regarding a TDWR interference
investigation which they are looking into. While we checked our equipment and
everything looks good, I thought it in the best interest of WISPs to forward
his contact
information should you need it as well as to be aware of our responsibilities
to DFS in the 5 GHz frequencies.
Here are his details of the issue at hand:
I am investigating a strobe that is affecting the Glen John airport and I am
requesting your assistants on this matter. This signal is emitting in the
5600 to 5650 MHz TDWR operation band. Being this is an out
each attempt to try and resolve this matter remotely, I am asking for your
team to review your DFS setting on your system. The strobe starts near the
John Glen airport, Columbus and tracks to/near West unity, Oh., Frontier, Mi.,
direction.
I used the National Broadband Map to locate the WISP operators near these areas
and I am aware that there are more operators in the area that are not listed.
The FCC tiger teams has tracked WISP signals beyond 60 miles that have affected
TDWR systems.
I would also am providing my contact information for any questions you might
have and to have someone from your team contact me .
Regards,
Albert Furlow
Electronics Engineer
Columbia Field Office
FCC Enforcement Bureau
[email protected]
301-725-0122 Office
202-391-1847 Cell
Thanks,
Todd Harpest, External Affairs & Regulatory Director
Technologies, Inc.
419.990.0310 | 888.999.8002 x2310
[email protected] | www.metalink.net
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