[time-nuts] wwvb 60 khz tuning fork crystals Some insights

[paul swed]

Ed strange no body and you sent it 3 days ago.


On Thu, Jun 27, 2013 at 12:13 AM, ed breya <eb at telight.com> wrote:

> I presume you used the regular 74HC04 or 74HCU04 inverter, not the 74HC14
> Schmitt trigger input type?? If the '14 is actually used, that may explain
> the problems around setting the feedback biasing resistor value - you may
> be overriding the built-in hysteresis to get it in the linear region.
> Usually that R isn't very critical with regular crystals, but maybe tuning
> fork types need more gain, or, if it's actually a '14, the input impedance
> is probably lower than a regular gate, so it's loading the resonator.
>
> Ed
>
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