[amsat-bb] Link Budget

Sat Nov 7 22:12:40 UTC 2015

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 <w7lrd at comcast.net> 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" <n8hm at arrl.net
> <javascript:_e(%7B%7D,'cvml','n8hm at arrl.net');>>
> *To: *"KA9QJG" <KA9QJG at comcast.net
> <javascript:_e(%7B%7D,'cvml','KA9QJG at comcast.net');>>
> *Cc: *"Joe" <nss at mwt.net <javascript:_e(%7B%7D,'cvml','nss at mwt.net');>>, "
> amsat-bb at amsat.org <javascript:_e(%7B%7D,'cvml','amsat-bb at amsat.org');>" <
> AMSAT-BB at amsat.org <javascript:_e(%7B%7D,'cvml','AMSAT-BB at amsat.org');>>
> *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 <KA9QJG at comcast.net
> <javascript:_e(%7B%7D,'cvml','KA9QJG at comcast.net');>> 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:amsat-bb-bounces at amsat.org
> <javascript:_e(%7B%7D,'cvml','amsat-bb-bounces at amsat.org');>] On Behalf
> Of Joe
> > Sent: Saturday, November 07, 2015 1:58 PM
> > To: amsat-bb at amsat.org
> <javascript:_e(%7B%7D,'cvml','amsat-bb at amsat.org');>
> > 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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> > _______________________________________________
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> _______________________________________________
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