I was told the interference was SE of the radar site.
-------- Original message --------From: Mark Radabaugh <[email protected]> Date:
8/19/20 2:51 PM (GMT-05:00) To: [email protected] Subject: Re: [Ohio] TDWR
Interference Investigation Hopefully this is clearer:On Aug 19, 2020, at 2:41
PM, spierce <[email protected]> wrote:North of what?-------- Original message
--------From: Mark Radabaugh <[email protected]> Date: 8/19/20 2:33 PM
(GMT-05:00) To: [email protected]: [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]>
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 PMTo: Albert
Furlow <[email protected]>Subject: Fwd: [Ohio] TDWR Interference
Investigation Begin forwarded message: From: Mark Radabaugh
<[email protected]>Subject: Re: [Ohio] TDWR Interference InvestigationDate:
August 19, 2020 at 2:18:46 PM EDTTo: [email protected]:
[email protected]: [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
RadabaughWISPAOn 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 EngineerColumbia Field OfficeFCC Enforcement
[email protected] Office202-391-1847 Cell Thanks, Todd
Harpest, External Affairs & Regulatory DirectorTechnologies, Inc.419.990.0310 |
888.999.8002 [email protected] | www.metalink.net <image001.png>
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