[time-nuts] Frequency comparison

Dan Rae danrae at verizon.net
Mon Feb 8 15:14:20 UTC 2010


Raj wrote:
>
> I was thinking of feeding two 10 Mhz signals to two ports of a SBL-1 or similar and taking the DC
> output at the IF port into an opamp or analog meter. This was visually easier to adjust the drift between two frequencies by just watching the needle move. A stationary needle over a couple of hours would be the best!
>
>   
Raj, I did exactly this but with an old chart recorder attached to the 
mixer IF port.  This allows one to leave the room and not have to watch 
for hours or days.   I was able to adjust my -hp- rubidium unit this way 
against gps to better than one cycle per day.

Low tech but effective.

Dan





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