Not enough space for the antennas is the big reason. Then there's the issue of S band downlink from GEO being unusable due to terrestrial QRM from WiFi and ISM devices.
Also, it's not impossible that we could lose the amateur satellite service allocation at 1260 MHz due to Galileo. Some European authorities are already restricting amateur operations there (even though Galileo receivers were supposed to be able to coexist with other users of the band).
Don't get rid of it yet. Maybe P3E will be able to carry L/S. Bands haven't been determined yet. There's still the issue of terrestrial QRM at S band though. Even so, maybe the L band uplink will be available and you'll just need to swap out the LNB and preamp on your receive system to receive 10 GHz.
And remember you'll be able to play around with your L band uplink system on Fox-1Cliff and Fox-1D.
73,
Paul, N8HM
On Saturday, November 7, 2015, Bob- W7LRD [email protected] wrote:
Why not L/S on a geo bird? I may have missed the memo on that idea. Many of us still have AO40 (sobsob) gear. 73 Bob W7LRD
*From: *"Paul Stoetzer" <[email protected] javascript:_e(%7B%7D,'cvml','[email protected]');> *To: *"KA9QJG" <[email protected] javascript:_e(%7B%7D,'cvml','[email protected]');> *Cc: *"Joe" <[email protected] javascript:_e(%7B%7D,'cvml','[email protected]');>, " [email protected] javascript:_e(%7B%7D,'cvml','[email protected]');" < [email protected] javascript:_e(%7B%7D,'cvml','[email protected]');> *Sent: *Saturday, November 7, 2015 1:22:13 PM *Subject: *Re: [amsat-bb] Link Budget
The good thing is that high power at 5 GHz is expensive, so I doubt anyone will be running too much more than they have to on P4B!
73,
Paul, N8HM
On Sat, Nov 7, 2015 at 4:10 PM, KA9QJG <[email protected] javascript:_e(%7B%7D,'cvml','[email protected]');> wrote:
Joe And Others for many years I have Heard thoughts about a Geo
synchronous
well mostly it was the cost, But I also heard a lot of people say if
We
had a Geo type bird We would have the people who like to setting us Big
ants
lots of power and just set and be on the birds all the time . Unfortunately I know We do have this type on the air I haves no idea if
this
would actually happen or not
73 De Don KA9QJG
-----Original Message----- From: AMSAT-BB [mailto:[email protected]
javascript:_e(%7B%7D,'cvml','[email protected]');] On Behalf Of Joe
Sent: Saturday, November 07, 2015 1:58 PM To: [email protected]
javascript:_e(%7B%7D,'cvml','[email protected]');
Subject: [amsat-bb] Link Budget
Can anyone here run a link budget for me?
I'm in an slight heated debate with some people, About how they have
heard
about the possible Geo synchronous bird coming up, and they are all wondering why don't "THEY" I like the "THEY" part, anyway why don't they just put it on the moon.
I gave them several reasons why a Geo bird is better,
1- It is there 24/7 where the moon is visible less than 50% of the day
2- the Geo bird doesn't move ( or extremely little) so set the antenna
and
forget it. Where the moon requires tracking programs and antennas that
can
move in AZ and EL
3- Useable "Window" The amount of the earths surface that can see either
is
soo close to the same why bother I bet a geo bird would be at least
close to
90% of what the moon see's
4- And finally antennas and power required. The moon being soooo much farther away the amount of power needed each way has to be MUCH more. And thats what I was wondering say you had a nice decent transponder in
Geo
orbit. what power levels say ERP I guess is needed each way? then drop
the
same transponder and how much more erp each way will be needed to have
the
same level of contact quality?
Joe WB9SBD
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Sent via [email protected]
javascript:_e(%7B%7D,'cvml','[email protected]');. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership.
Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected] javascript:_e(%7B%7D,'cvml','[email protected]');. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb