I'm in the middle of a big project, but I ran across a need for the following
and I'm on a side excursion in the lab for a few hours and I thought some in
the group might be interested in trying this.? That is, if you are bored.
In EMRFD by Wes Hayward, W7ZOI, Chapter 1, Page 1.11, Figure 1.15 is a
schematic for a simple Colpitts crystal oscillator.? And if you don't have
a copy of EMRFD, shame on you.? :-)? BTW.? The book came with a CD with his
RF Design book, that I scanned in and Wes used for the second printing.
OK, I got lost.? Looks like book is no longer in print that I can tell.
Copy on amazon for $92!!!? I don't think anyone will buy it at that price.? IMHO.
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We all could get rich!
Project:? Build the critter.? Use a socket for the crystal, but also use a socket
for the transistor.? Model the circuit using LTSpice and/or ngspice and use
K8IQY.com for the crystal parameters, if you don't already have some you measured.
Experiment with output levels for different frequencies and different transistors.
I'm building one as we speak to add to the set of tools to test crystals and also
to test transistors from China.? Some one mentioned, and I apologize for not looking
up the name and call, measuring the noise figure.? Care to give the group a lesson?
It would be appreciated.? I'm going to go through my pile of different sets to
eliminate any future problems.
Sharing,
chuck, aa7fo
