Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
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Subject: Re: How does a mixer work?
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Date: Tue, 22 Oct 2002 16:08:08 +0100
NNTP-Posting-Date: Tue, 22 Oct 2002 16:08:14 BST
"John Woodgate" wrote in message
> I read in sci.electronics.design that Kevin Aylward
> wrote (in
r.ntli.net>) about 'How does a mixer work?', on Tue, 22 Oct 2002:
> >The root of this is that a fixed frequency can only be true, if the
> >wave has been on since the dawn of time.
> Quite true, but the uncertainty relates to THE frequency of signal,
> whether that frequency is constant or varying, as some here seem to
> claim. There is nothing in the mathematics or physics to show that
> frequency modulation occurs.
I am not really sure what you are saying here. Other, then the infinite
sine wave, you cannot determine the exact frequency because of the
theoretical relations I noted in my other posts, i.e. DF.DT>=1/2.
Therefore, it cannot be claimed that no frequency modulation occurs. You
cannot claim something that in *principle* cannot be measured.
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Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.