[time-nuts] J06 HP-59992A time interval calibrator for HP-531xx counters

Francesco Messineo francesco.messineo at gmail.com
Sun Jul 9 09:35:22 EDT 2017

On Sun, Jul 9, 2017 at 2:15 AM, Mark Sims <holrum at hotmail.com> wrote:

> So far my design is tending towards:  10MHz ref input -> Minicircuits doubler -> Wenzel squarer -> 74AC74 divider -> 74AC04 buffer -> level shifter.  The doubler/divider might not be needed,  but I think it will give a more symmetric output.  I might include a space for a 10 MHz TTL oscillator for non time-nut users... hopefully it might be stable enough over the short time interval for a cal measurement cycle.

once upon a time, I was experimenting with digital signals to derive
stable RF transverter
LOs. I've "found" that feeding a XOR gate with a signal and his
replica delayed by 2 inverters
did result in a crude frequency doubler (well it's rather an edge
detector). Since I was going to use the double frequency just to drive
a divider by two, the actual duty cycle out of the doubler didn't


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