Re: FW: ARLB013 ARRL aiding effort to mitigate repeaterinterference to military radars

24 Apr 2007

      Hi Ed
Somehow I feel as thought I have been left out of something.
Pave Paws has been around a very very long time.
70cm use by Hams has like wise been there maybe longer.
Living in the center of the country and not having to concern 
myself with the 70cm restriction to Ham use within a given 
distance of certain Military installations I have no idea what changed.
Something changed.
Do you know what that might be? 
The attention appears to be toward 70cm repeaters
Was no one paying any attention to the 70cm restrictions when
validating the 70 cm repeater installations?
Are these repeater netted over the Internet?
There is more that just PAVE PAWS to consider if my memory serves.
Hams need the real truth about what caused the current problem.
I do not , am not able to get that from all I have seen on the BB.
Can you add anything Ed?
37 years in DOD testing makes me sensitive in many ways .
Thanks Ed
73's
Joe K0VTY
On Tue, 24 Apr 2007 06:48:20 -0800 Edward Cole kl7uw@acsalaska.net
writes:
...
Tony, Roger, etal:
A "slice" will not be a solution to PAVE PAWS  which is broadband 
covering the whole spectrum (420-450 MHz).  There already exists 
restricted use of 70cm within range of selected military 
installations in FCC regs.  Those unlucky to live within the 
affected 
areas cited will have no recourse but to restrict operations 
(however 
that takes effect).  Voluntary negotiations may lead to some time 
slots of permission.  Otherwise, we get "regulated" off the band.
Build satellites that require no more than 5w EIRP from the ground 
station may be the only answer.  OR move to another uplink 
band.  That's a possibility that may be the "hard news".
UN-Licensed users are more the long-term problem facing ham radio, 
than the military user...in my opinion.  Ham radio has a long 
history 
of sharing allocations with the military.  The short history of 
"part-15" and their "ilk" is not pretty.
So now its use it AND lose it...can't win!
good luck to us?
73 Ed - KL7UW
At 05:23 AM 4/24/2007, Roger Kolakowski wrote:
...
Tony wondered:
"Should this ARRL msg. cause us to worry..."
Yes... The key is that in the US we are secondary users in the 420

450 mHz

...
band and while there are only 2 PAVE PAWS sites active, another
interesting
...
"land grab" can be found by googling wind shear radar and 449.000
mHz.
...
We are at the whim of the government with no primary allocation,
for example
...
there is this "grab" -- "Tire Pressure Monitoring System with
Frequency
...
Range of 433.92MHz."
An effort for Amateur primary allocation of even a "slice" would be
prudent.
...
Roger
WA1KAT
----- Original Message -----
From: tjjapha@earthlink.net
To: amsat-bb@amsat.org
Sent: Tuesday, April 24, 2007 9:30 AM
Subject: [amsat-bb] FW: ARLB013 ARRL aiding effort to mitigate
repeaterinterference to military radars
...
Hi All,
Should this ARRL msg. cause us to worry about the future of mode
B
...
...
operations?
73,
Tony, N2UN
...
[Original Message]
From: ARRL Web site memberlist@www.arrl.org
To: tjjapha@earthlink.net
Cc: <Subscribed ARRL Members:>
Date: 4/24/2007 12:06:01 AM
Subject: ARLB013 ARRL aiding effort to mitigate repeater
interference to
...
...
military radars
...
SB QST @ ARL $ARLB013
ARLB013 ARRL aiding effort to mitigate repeater interference
to
...
...
...
military radars
ZCZC AG13
QST de W1AW
ARRL Bulletin 13  ARLB013
From ARRL Headquarters
Newington CT  April 23, 2007
To all radio amateurs
SB QST ARL ARLB013
ARLB013 ARRL aiding effort to mitigate repeater interference
to
...
...
...
military radars
The ARRL has been working with the US Department of Defense
to
...
...
...
develop a plan to mitigate alleged interference from 70 cm ham
radio
...
...
...
repeaters to military radar systems on both coasts. Citing an
increasing number of interference complaints, the US Air Force
has
...
...
...
asked the FCC to order dozens of repeater systems to either
mitigate
...
...
...
interference to the ''PAVE PAWS'' radars in Massachusetts and
California or shut down. Amateur Radio is secondary to
government
...
...
...
users from 420 to 450 MHz and must not interfere with primary
users.
...
...
...
The Commission has not yet responded. ARRL Regulatory
Information
...
...
...
Specialist Dan Henderson, N1ND, stresses that the Defense
Department
...
...
...
acknowledges Amateur Radio's value in disasters and
emergencies and
...
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...
is being extremely cooperative, and a wholesale shutdown of US
70 cm
...
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...
Amateur Radio activity is not in the offing.
''The ARRL Lab is working up calculations on each repeater
system the
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Air Force has identified to determine where
interference-mitigation
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...
techniques offer a reasonable chance of keeping the repeater
on the
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air,'' Henderson says.
The situation affects 15 repeaters in the vicinity of Otis Air
Force
...
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Base on Cape Cod, Massachusetts, and more than 100 repeaters
within
...
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some 140 miles of Beale Air Force Base near Sacramento,
California.
...
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...
A US Air Force contractor identified the problematic repeater
systems last summer, but the situation didn't become critical
until
...
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...
the Air Force contacted the FCC a month ago. ARRL officials
met with
...
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...
Defense Department representatives in late March to discuss
alleged
...
...
...
interference to the PAVE PAWS radar sites. Henderson has
contacted
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Amateur Radio frequency coordinators in both affected areas.
PAVE PAWS is a missile and satellite detection and tracking
system,
...
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...
and its facilities occupy essentially the entire 70 cm band --
one
...
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...
factor that makes mitigation difficult. As a ''first step,''
however,
...
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the ARRL is recommending that all affected repeater owners
reduce
...
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power -- possibly to as little as 5 W effective radiated
power
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(ERP).
''We understand the difficulty this may cause to owners and
users,''
...
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Henderson said, ''but the alternative to operating with a
smaller
...
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...
coverage area may be not operating at all.''
Henderson says the League is still seeking further information
on
...
...
...
the problem. ''Until the Defense Department accepts a
mitigation
...
...
...
plan, repeater owners should exercise patience,'' he
cautioned.
...
...
...
Contact Dan Henderson, N1ND, n1nd@arrl.org, or 860-594-0236,
with
...
...
...
specific questions or issues associated with this situation.
NNNN
/EX

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73,
Ed - KL7UW
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joseph Murray

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