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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