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XTAL Radio Receiver Circuits

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May 4th 09, 01:57 AM posted to rec.radio.amateur.homebrew

Bill M[_3_] Bill M[_3_] is offline

Bill M[_3_] is offline

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XTAL Radio Receiver Circuits

wrote:

What about the other half of
the Electromagnetic wave? Half the potential power of the radio wave
is gone, wasted. It can be recovered and utilized. But it must be
done correctly.

Hi tack. I've seen you on some of the other forums.

No disagreement in that you can recover the other half and add things
together. I offered the full-wave centre-tapped coil as an example.

But that only works for humble 'local station' circuitry.

How can we do the same thing for low-level/high selectivity circuits? I
dunno. The predominant thinking is that you get the voltage 'gain' by
going to the moon with hi-q rf circuitry which is at odds with a bunch
of diodes configured as a multiplier because of the loading factor. Or
having some other mass of wire on the same coil form. Kills the Q and
consequently kills off the voltage gain.

Now if a guy has enough room...I'm only being partly facetious...to have
tuned circuit A separated far enough away from tuned circuit B (or C or
D) he could probably find a way to combine them. A good hi-q circuit
might require 12 inches plus of physical isolation. I've not seen
anybody approach it that way . Probably because the expense and effort
of multiple tanks is mitigated by less effort on a good single tank.

Crystal sets remain to be a fascinating 'open book' for experimentation.

-Bill

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