[time-nuts] LightSquared is back now called Ligado

[djl]

And the competition has/is putting up a gazillion cubesats to screw up 
another of my little pleasures, astronomy. Bah. It's enough to make you 
want to go out and stand right next to somebody.
Don

On 2020-04-17 14:37, Scott McGrath wrote:
> That was +9.8 on the terrrestrial microcell transmitters,
> 
> Yes this seems to have been sold with the assurance that the magic
> brickwall filters with 100db/octave slope will be included in every
> one.
> 
> But the asian manufacturer of said devices will neglect to include
> them.... and juice the power a wee bit to say +23...
> 
> Of course this will hose every GPS system for miles around and for
> those of us who fly our multi thousand investment in ADS-B will be
> rendered useless as the ADS-B still uses L1.    In our club’s Cessna
> 172 the new ADS-B in/out compliant radio stack was 20,000 as we are
> close to a lot of controlled airspace.
> 
> 
>   I dropped a note to AOPA on this.   Because remember the entire
> airway system is now supposed to be managed by aircraft exchanging
> position, bearing altitude and rate of climb dynamically to each other
> and ground stations instead of todays radar based system.
> 
> And say goodbye to our GPSDO’s
> 
> On Apr 17, 2020, at 2:59 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> Was that +9.8 or -98 dbm ? :)
> 
> At -98 they probably *could* coexist with GPS. Not real clear how well 
> there
> system would work at that level though.
> 
> Bob
> 
>> On Apr 17, 2020, at 1:37 PM, Scott McGrath <scmcgrath at gmail.com> 
>> wrote:
>> 
>> Supposedly lowering Tx power on terrestrial network from +23 DBm to 
>> +9.8 DBm will make everything better.  Ajit Pai is listening only to 
>> carriers and ignoring DoD who is stating it will significantly degrade 
>> and/or make useless the GPS system.
>> 
>> Not to mention ADS-B which was installed at great expense by the 
>> private and commercial aviation systems. And is totally dependent on 
>> the GPS segments most affected by Ligado
>> 
>> Read and weep
>> 
>> https://arstechnica.com/tech-policy/2020/04/fcc-to-approve-5g-network-despite-military-saying-it-will-harm-gps/
>> 
>> 
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-- 
Dr. Don Latham  AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304