[time-nuts] - LightSquared is back now called Ligado

[Dave B]

Hi.

Reading that web page, they are talking dBW levels, not dBm levels. 
Hopefully that is a typo, as 0dBW is of course 1000 times more than 0dBm.


To quote from the page:-

The base-station power reduction is "from 32dBW to 9.8dBW," and Ligado
committed to a 23MHz "guard-band using its own licensed spectrum to
further separate its terrestrial base station transmissions from
neighboring operation," the FCC said.

32dBW if I'm not mistaken, is some 1500W !   9.8dBW is just under 10W.  
(Maybe someone costed the potential electric bill per site?)


dBW is a common spec' in licensing forms, certainly over hear.

Even so, 9.8dBW from a femtocell (like a plug in wall wart sized thing)
is going to really anger the tinfoil hat brigade.


But anyway, what the hell is the point of a satellite based system, if
you're going to pollute the downlink frequencies.  Even more so, when
said satellite reception systems are working with signal levels close to
the ambient noise anyway.

That, and isn't 5G intended for (among other things) mobile devices? 
That probably will be trying to use GPS etc as well.   Shoot in own foot
time I think.


Regards.

Dave B.



On 18/04/2020 00:56, time-nuts-request at lists.febo.com wrote:
> Message: 1
> Date: Fri, 17 Apr 2020 13:37:26 -0400
> From: Scott McGrath <scmcgrath at gmail.com>
> To: time-nuts at lists.febo.com
> Cc: Mike Rogers <mike at mrogers.org>
> Subject: [time-nuts] LightSquared is back now called Ligado
> Message-ID: <1840EAFF-B006-4512-8DA3-F7C1463B8370 at gmail.com>
> Content-Type: text/plain;	charset=us-ascii
>
> 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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