[amsat-bb] Link Budget

Burns Fisher burns at fisher.cc
Sat Nov 7 20:29:30 UTC 2015

Fudge.  That is GeoSTATIONARY birds would require *no* tracking....

On Sat, Nov 7, 2015 at 3:28 PM, Burns Fisher <burns at fisher.cc> wrote:
> While it appears that you are right about the link budget, one of you
> arguments holds only *some* water, and that is tracking.
> GeoSTATIONARY birds would require to tracking, but there are
> geosynchronous orbits (i.e. 24 hours, but not necessarily 0
> inclination and 0 eccentricity) which would move north/south or
> east/west in the sky over the course of a day.
> And regarding the moon:  Another argument against it is that it is
> darned hard to land on the moon.  Lots more deltaV required.
> 73,
> Burns W2BFJ
> On Sat, Nov 7, 2015 at 2:57 PM, Joe <nss at mwt.net> wrote:
>> 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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