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Raising the frequency of a quartz crystal

Posted: Sat Apr 29, 2017 3:48 pm
by ki3u
For those interested I have some data on raising the oscillation frequency of quartz crystals, in particular moving a
5675 KHz crystal up to 6109 KHz :

http://ki3u.byethost3.com/Radio-Physics ... uency.html

Berj / KI3U

Re: Raising the frequency of a quartz crystal

Posted: Mon May 01, 2017 9:34 pm
by mightyohm
Berj - That is a great article. Thanks for sharing the details of retuning crystals. I never realized that the crystal was just clamped in place in the old style housings!

Re: Raising the frequency of a quartz crystal

Posted: Tue May 02, 2017 9:34 am
by ki3u
Hi Jeff

r tnx. Well it's a useful skill to change these older crystals for modern use - there are still tons of them
available. Lets note that the FT 243 types were intended for vacuum tube circuits, but as we see in the
article the crystal oscillates nicely in a one-transistor test oscillator powered by a 9-Volt battery.

Berj / KI3U