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From: stephany.WBST@Xerox.ARPA
Newsgroups: net.ham-radio
Subject: Re: modulation question
Message-ID: <2861@brl-tgr.ARPA>
Date: Tue, 5-Nov-85 13:37:11 EST
Article-I.D.: brl-tgr.2861
Posted: Tue Nov  5 13:37:11 1985
Date-Received: Fri, 8-Nov-85 07:17:26 EST
Sender: news@brl-tgr.ARPA
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re: problem with power in a balanced modulator

I think your problem is that you assumed that the diode characteristics
fit a pure square law .  Actual, ideal diodes contain higher terms,
third, fourth, etc. power.  An ideal diode is  I=Io(1-exp(eE/kT)), which
must be expanded in a power series.   In the balanced configuration all
odd terms cancel so you are left with the square, fourth power and
higher even powers.  Your math only took into account the first square
term.  I did not work it out but I believe that is the problem.

				Joe  N2XS