[HCARC] How To Figure Db Gain In Amplfiers
Gary and Arlene Johnson
qltfnish at omniglobal.net
Tue Sep 10 21:09:19 EDT 2013
How To Figure Db Gain In Amplifiers??
Premise: Double the power = Gain 3 Db
100 watts to 200 watts = 3db
200 watts to 400 watts = 3 db
400 watts to 800 watts = 3 db
800 watts to 1500 watts = approx 3 db
100 watts to 1500 watts = approx 12 db or approx 2 s units
Question - if I were to go 100 to 500 or 600 watts what is the db increase - I don't think it is proportional i.e 3 db plus 3 db plus 1/3 of another 3 db (for 500 watts) = 7db. That would be too easy and I don't think logs are proportional.
Last question. IF your beam antenna gives you 10 db gain and your amp gives you 7-8 db gain is your total gain then (in a perfect world) 17-18 db??
Gary J
N5BAA
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