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Re: Sideband Production
Subject:
Re: Sideband Production
Date:
Sat, 22 Mar 1997 14:35:56 -0500 (EST)
From:
richard hull <rhull-at-richmond.infi-dot-net>
To:
Tesla List <tesla-at-pupman-dot-com>
snip
> The upshot of all this is that the waveshape that the physical
>processes give rise to is *equivalent* to that you would see if you
>summed two disparate frequencies together. So the two side
>frequencies are present in the system by virtue of physical act of
>transferring energy from one circuit to another over several cycles.
>Since the speed that process occurs at is dictated by k, the
>resultant sideband frequencies are a function of k.
>
> A final note: As k is increased in the 2-coil system, the
>frequency Fr-Fb tends to zero, and Fr+Fb tends to infinity so there
>is a difference between our situation and a modulator. This is
>because both of the frequencies fed into a modulator are fixed but
>the beat frequency in our systems varies with k. We can say that
>for a given k, both frequencies are fixed but it is important to note
>that in our case, Fb can never exceed Fr - not true of the modulation
>case. If this happens in a modulator, it gives rise to a phenomemon
>known as aliasing.
> What we see on the scope is true to what is happening with
>respect to time but tells us nothing about what is happening with
>respect to frequency.
>
>Malcolm
>
>Malcolm
Thanks for the verbal "think out loud" . This is well done and bears
more
than a passing glance by those able to grasp what you say and relate it
to
their own work. I printed this one out to cogitate on a bit. 90% of
the
messages which I receive spend less than 10 minutes on my hard drive!
Richard Hull, TCBOR