As Eddie says, I'd use a decent regulator rather than a zener.
Also what are you measuring the 1pps signal with ?
A DMM might not have the response time to show it properly,
especially if it's a very narrow width pulse.
An analogue meter would help, but a scope is better.
Or, just to test it, an LED and a 1K resistor and it should pulse.
73 de Andy FTD
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--- In QRPLabs@..., Andy Cutland <gj7rwt@...> wrote:
Hi Eddie,
I originally got my 3v from using a few diodes in series off the 5v reg pin. When this appeared not to work I then tried a pot but I may have limited the current too much with the output resistor so I need to experiment again tonight.
I was really confused at this low voltage reading on pin 7. Will check again tonight and see what results I get.
Thanks for the advice.
73's
Andy
