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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: How does a mixer work?
References: <email@example.com> <3DB2E3CE.firstname.lastname@example.org> <email@example.com> <3DB41488.firstname.lastname@example.org> <3DB43497.A32B8380@webaccess.net> <3DB95575.email@example.com>
Date: Sat, 26 Oct 2002 11:59:36 GMT
NNTP-Posting-Date: Sat, 26 Oct 2002 04:59:36 PDT
Fred Bloggs wrote:
> Chuck Simmons wrote:
> You keep going back to the either-or argument. The time-domain
> representation is useful for verifying correct operation of the circuit
> like frequency, modulation index, amplitude and so forth. The frequency
> spectrum is useful for making other determinations like bandwidth and
> spectral power density requirements. You also need to add some reality
> to your statistics at least so far as time scale is concerned. I don't
> think there is any getting around the fact that carrier power is
> constant over any time interval that is long compared to the information
> bandwidth. The observation that the carrier turns on and then off is
> useless. Your examples are unrealistic extensions of the usual case to
> which AM is applied. I checked my 1943 addition of Terman's Radio
> Engineers handbook, and the first thing he does is decompose the
> classical AM modulation function into the carrier and sideband summation
> which he credits to a 1923 IRE paper by Hartley.
The either or is that you must accept both sides of an equation to be
correct representations. You cannot say that one side is more correct
than the other. Either both sides are equally correct or the equation is
I am quite familiar with F. E. Terman's "Radio Engineers Handbook". I
bought my copy in 1961 and used it during the years I was in radio and
TV broadcating and communications (until about 1970).
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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