Hi,
This is going to affect INMARSAT and Iridium satellite phone service as
well. Does anyone know anything about this?
As I see it, putting such transmitters into operation will render
consumer grade GNSS receivers unusable. High-end survey and
reference receiving systems might have to be upgraded with sharper
filtering (much more costly and bulky) to maintain reliability.
If Ligado transmitter spurious emission requirements at band edge will
have to meet unrealistic requirements to prevent interference
with GNSS. L-band satphone service could be completely cooked.
I guess the FCC suffers from being co-opted by the current crop of
kleptocrats and incompetents that affect other branches of government as
well..and not just in the USA!
Cheers,
Bill
On 18.04.20 11:37, Dave B via time-nuts wrote:
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, [email protected] wrote:
Message: 1
Date: Fri, 17 Apr 2020 13:37:26 -0400
From: Scott McGrath <[email protected]>
To: [email protected]
Cc: Mike Rogers <[email protected]>
Subject: [time-nuts] LightSquared is back now called Ligado
Message-ID: <[email protected]>
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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