[amsat-bb] Link Budget

[Paul Stoetzer]

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> 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] On Behalf Of Joe
> Sent: Saturday, November 07, 2015 1:58 PM
> To: 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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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. 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