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

[ed breya]

If you're talking about the email processing, I think something's 
going on. It sometimes take two or even three tries to get one 
through, while the most recent one I just sent (about regulators) 
went OK the first time. Let's see if this one does. B

BTW how do you guys get the thread to continue on from the current 
message? I have only been able to copy and paste parts into the new 
email, and that loses some of the links and formatting in some way. I 
don't think this is the cause of the email problem above, since it 
seems uncorrelated with any editing or whether I send a brand new 
topic. I'm using an old version of Eudora (7.1.0.9), if that matters.

Ed


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


On Thu, Jun 27, 2013 at 12:13 AM, ed breya 
<<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>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