[amsat-bb] Re: Lightsquared Analogy

[Robert McGwier]

Okay, we agree with Shakespeare ... kill all the lawyers, at least then we
could be allowed to do the engineering AHEAD OF TIME.





On Thu, Mar 1, 2012 at 5:24 PM, Bob Bruninga <bruninga at usna.edu> wrote:

> > In this case that would be wrong.  The headphone manufacturers
> > complained that good foam costs too much and were allowed
> > to get away with tissue paper and now everyone pays for
> > allowing lobbyists and lawyers run the FCC and ignore good
> > design principles
>
> No, its not just "good foam" that is required, it is surrounding each
> Headphone and each Human wearing them with an 80 dB Accoustic chamber to
> solve the problem of the LightSquared Rock band in the room!
>
> There are TWELVE or more orders of magnitude  (120 dB) between a nearby
> transmitter and a nearby GPS receiver.  That is, the transmitter is
> 1,000,000,000,000 times stronger than the sensitivity of the nearby GPS
> receiver.  It is absurd to expect every $20 GPS to have 120 dB filters.
>
> Ham radio only needs 40 dB out of band rejection to be within FCC specs.
> NASA demands 80 dB out of band rejection.  LightSquared wanted every $20
> GPS
> MFR to install 10,000 times more filters than even NASA!
>
> No, the analogy is correct.  That is why the FCC has always (when they had
> real engineers anyway) had band plans that SEPARATE Transmit bands from
> weak-signal satellite receive bands.  It is ludicrous to allow a bunch of
> clueless lawyers try to buy their way into putting Transmitters in the the
> RECEIVE ONLY satellite bands.
>
> Bob, WB4APR
>
> From: Robert McGwier [mailto:rwmcgwier at gmail.com]
> Sent: Wednesday, February 29, 2012 7:30 PM
> To: Bob Bruninga
> Cc: amsat-bb at amsat.org
> Subject: Re: [amsat-bb] Lightsquared Analogy
>
> On Feb 29, 2012 3:01 PM, "Bob Bruninga" <bruninga at usna.edu> wrote:
> I finally figured out a good analogy about the LightSquared and GPS fiasco.
> ---------------
>
> There is a "music room" where people can go and, with headphones, listen to
> their own music.  No one disturbs anyone else.  Everyone is happy.
>
> A LightSquared rock band comes into the room and begins to play at max
> volume, and then insists there should be no problem because the headphones
> work just fine in providing the isolation between what each person is
> listening to.
>
> Therefore the interference to everyone in the room is not their fault, but
> the fault of the Headphone Manufacturers!
>
> Bob, WB4APR
>
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-- 
Bob McGwier
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