[Lowfer] BCY

[Bill Ashlock]

Jerry,

I used to find the 4011 stability fairly descent, although, as of late, I've 
been starting out with a separate MPF102 xtal oscillator because I have more 
control over the feedback capacities and bias currents which can have an 
effect on the temp coefficient and the long term stability.  Are you 
planning to keep the exciter inside the house?...... highly recommended.

Good luck!

Bill A


>After checking the oscillators output on the exciter and found it not 
>stable at all, I have decided to replace it. I obtained a schmatic for the 
>TM-1 transmitter and the model I have is different. The oscillator on the 
>model I have uses three I/C's that are no longer available (or at least 
>hard to find), but the schematic shows using a CMOS 4011 as the oscillator 
>and a 4024 as a frequency divider. The curcuit is very similar as shown in 
>my 6th edition of the Low and Medium Frequency Radio Scrap Book.
>Has anyone here or is anyone here using this curcuit on their LF or MF 
>transmitters.? and how stable is it. or would you recommend a different 
>oscillator curcuit.
>
>Thanks
>Jerry
>
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