A couple of other comments!

1: Don't forget to allow for any beacon on the satellite as the power that it is using will have to be deducted off the maximum power available per user

2: But SSB and CW are not continuous level signals so the actual transponder loading will be, on average lower, as a result (unless all the users decided to try "wallooing" on the uplink at the same time..........)

3: Jan King's major work on link budgets with a spreadsheet and comprehensive guidance notes is available here: http://www.amsat.org.uk/iaru/ This does not direct deal with linear transponders but I know he is working on that. It is however already a very useful reference on this subject.

73

Graham G3VZV ----- Original Message ----- From: "john heath" g7hia@btinternet.com To: "amsat" amsat-bb@amsat.org Sent: Friday, January 05, 2007 12:01 AM Subject: [amsat-bb] Calculating Link Budgets

Hi Bruce and the list,

As usual, Satellite Handbook by Davidoff K2UBC has the answer. Chapter 8 page 12 has a fully worked out calculation on predicting signal levels. Its for a geostationary satellite with a 35W transponder and 70 users as follows:

"The average power allocated to each user is therefore 0.5 watt."

Hope this helps

73 john g7hia _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb