Thank you Tim,
It is nice to see we have some people who don't mind telling the truth instead of concealing it. From what I can see, the frequency stability of any transmitted frequency will depend on the stability of the clock. Am I correct?
If this is the case, then the prime importance is to connect a stable clock that will not drift with changes in temperature or battery charge. The good part is that once a stable clock is established, the range of frequencies produced will not drift as long as the clock frequency does not drift.
So the real answer to my question is the Pro-4 uses a 16f628 pic with flash memory, not a 555 timer. Sounds like a nice arrangement if the clock is calibrated and stable.
Best wishes,
J_P
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