[amsat-bb] Re: Calculating Link Budgets

Graham Shirville g.shirville at btinternet.com
Fri Jan 5 01:29:08 PST 2007

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 

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.


Graham G3VZV
----- Original Message ----- 
From: "john heath" <g7hia at btinternet.com>
To: "amsat" <amsat-bb at 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
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