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Re: FW: ARLB013 ARRL aiding effort to mitigaterepeaterinterference to military radars



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
> > > is being extremely cooperative, and a wholesale shutdown of US 70 cm
> > > Amateur Radio activity is not in the offing.
> > >
> > > ''The ARRL Lab is working up calculations on each repeater system the
> > > Air Force has identified to determine where interference-mitigation
> > > techniques offer a reasonable chance of keeping the repeater on the
> > > air,'' Henderson says.
> > >
> > > The situation affects 15 repeaters in the vicinity of Otis Air Force
> > > Base on Cape Cod, Massachusetts, and more than 100 repeaters within
> > > some 140 miles of Beale Air Force Base near Sacramento, California.
> > >
> > > A US Air Force contractor identified the problematic repeater
> > > systems last summer, but the situation didn't become critical until
> > > the Air Force contacted the FCC a month ago. ARRL officials met with
> > > Defense Department representatives in late March to discuss alleged
> > > interference to the PAVE PAWS radar sites. Henderson has contacted
> > > Amateur Radio frequency coordinators in both affected areas.
> > >
> > > PAVE PAWS is a missile and satellite detection and tracking system,
> > > and its facilities occupy essentially the entire 70 cm band -- one
> > > factor that makes mitigation difficult. As a ''first step,'' however,
> > > the ARRL is recommending that all affected repeater owners reduce
> > > power -- possibly to as little as 5 W effective radiated power
> > > (ERP).
> > >
> > > ''We understand the difficulty this may cause to owners and users,''
> > > Henderson said, ''but the alternative to operating with a smaller
> > > 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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> >
>
>_______________________________________________
>Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
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73,
Ed - KL7UW
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