[HomeBrew] Single Tube Transmitter Notes

[Michael]

-----Original Message-----
From: homebrew-bounces at mailman.qth.net
[mailto:homebrew-bounces at mailman.qth.net] On Behalf Of bcarling at cfl.rr.com
> The worst of all is the TRI-TET design also known as the "Crystal Cracker"
by many hams > because they had disappointment when their crystals broke in
this circuit.

If the oscillators were built as originally designed, this wouldn't happen.
The grid tank circuit is never tuned to the crystal frequency but rather
approximately halfway between the fundamental and first harmonic.  This is
used to control crystal current, not to resonate with the crystal.  The
plate tank tuned to the desired harmonic but never the fundamental.  The
"crystal crackers" that I've read about all violate these simple rules.

Best Regards,
 
Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  
Sometimes I pretend to be normal but it gets boring so I go back to being
me.
http://www.nationalmssociety.org/chapters/NTH/index.aspx
http://wh7hg.blogspot.com/
http://kludges-other-blog.blogspot.com
Hiki Nô!