[aprssig] How The FCC Plans To Destroy GPS - A Simple Explanation

[Amir Findling K9CHP]

And this is important as with BPL we had the ARRL and its lawyers 
organizing the battle. GPS users are represented, maybe, by the 
manufacturers, which may see big $$ if new GPS units were to be needed...

========================

73 de K9CHP Amir Findling, Member ARRL, ARRL/ W5YI VE, WAC, WAS, DXCC

www.K9CHP.net <http://www.k9chp.net> Blog:http://k9chp.blogspot.com 
<http://k9chp.blogspot.com/>

Eagle Valley Search Dogs <http://evdogs.org/>, Senior K9 Handler

K9 Certification Tester, NYS Federation of Search Teams 
<http://www.nysfedsar.org/>

1st Special Response Group <http://www.1srg.org/> (1SRG)


On 2/7/2011 16:25, clayj at nwlink.com wrote:
> Yeah, this is definitely BPL "dejavu all over again".
>
> But, as someone on Time-Nuts (where this originated) pointed out - the
> first time the LightSquared (?) folks mess up either a military or
> aviation GPS; the FCC will pull this authorization (and, as Steve says,
> then the attorneys and consultants will get rich(er)).
>
> In the meantime, there IS something we can do - I wrote all 3 of my
> congresscritters (which is easy these days, just fill out some contact
> information and cut/paste the text) and asked that they look into this.
> So far,only Patty Murray (Sen D WA) has responded; but her response was a
> "legislative inquiry" to the FCC, asking them to respond to me.
>
> Imagine how annoyed the FCC would get if they got 2 or 3 of these from
> EVERY representative and senator; or even 50% of them!   If they get
> annoyed enough, they MIGHT take a second look.
>
> Clay
> N7QNM
>
>
>> Reposted from the Yahoo TinyTrack group:
>>
>> "Seen this in the VX-8R and TH-D7 groups here on Yahoo. Since I haven't
>> seen it posted in here... I figured I would (as it would have a serious
>> effect on APRS tracking).
>>
>> <http://freegeographytools.com/2011/how-the-fcc-plans-to-destroy-gps-a-simple-explanation>
>>
>>
>> Mike - N1EVH"
>>
>>
>> Quick summary of the story:   The FCC has apparently fast-track
>> authorized, through a questionable procedure, a "4G" high-speed wireless
>> internet service to operate on frequencies directly adjacent the the 1575
>> MHz GPS channel.
>>
>> This system, ostensibly a satellite-based service, would be augmented by
>> thousands of terrestrial "fill-in" transmitters that could desensitize or
>> block GPS receivers for a radius of several miles around each site.
>>
>>
>>
>> I have already observed this phenomenon from 1.9 GHz PCS cellular base
>> stations.  Some GPS systems with remotely-mounted active antennas
>> containing 15-20 dB gain preamps (to offset the coax loss) will
>> desensitize and go out of lock when they get within a half-block or so of
>> a PCS cell site.  (All-in-one GPS devices, such as hockey-puck or
>> mouse-type units or car navigators, where a non-amplified passive antenna
>> is connected directly to the receiver front end, don't seem to be prone to
>> this problem.)
>>
>> In the case of PCS, the offending transmitters are 400 MHz or so away from
>> the GPS channel.  This new threat is DIRECTLY ADJACENT to the the GPS
>> channel, and most likely will be a far far worse problem.
>>
>>
>>
>> Is this the BPL fiasco redux??
>>
>> Or more directly comparable, the mess on 800 MHz where thousands of Nextel
>> transmitters were licensed on frequencies interleaved with 800 MHz public
>> safety channels.  The problem was that the public safety systems use
>> relatively few base stations, often on mountains or tall towers many miles
>> away from the users' handhelds; i.e. delivering a relatively low signal
>> strength to users on the ground.  The Nextel systems were placing
>> transmitters on low towers every few blocks in town, yielding signals on
>> the ground hundreds or thousands of times greater. These were massively
>> overloading the front ends of PS receivers on adjacent channels,
>> desensitizing them without creating audible interference.
>>
>> Hundreds of millions of dollars have been spent in a 800-MHz rebanding
>> process (where Nextel is supposed to pay for new radio gear for the PS
>> users on a different block of frequencies) that has dragged on for years
>> now. So far, the rebanding effort has mainly benefited communications
>> attorneys and radio design consultants hired by both sides.
>>
>>
>> -------------------------------------------------------------------------------
>>
>> --
>>
>> Stephen H. Smith    wa8lmf (at) aol.com
>> EchoLink Node:      WA8LMF  or 14400    [Think bottom of the 2M band]
>> Skype:        WA8LMF
>> Home Page:          http://wa8lmf.net
>>
>> =====  Vista&   Win7 Install Issues for UI-View and Precision Mapping =====
>>       http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7
>>
>> *** HF APRS over PSK63 ***
>>      http://wa8lmf.net/APRS_PSK63/index.htm
>>
>> "APRS 101"  Explanation of APRS Path Selection&   Digipeating
>>     http://wa8lmf.net/DigiPaths
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
>
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