[time-nuts] Frequency comparison

Adrian rfnuts at arcor.de
Mon Feb 8 15:51:19 UTC 2010

Anyone who would like to clone the HP K34-59991A Pase Comparator?
Maybe just add a 'maginfier'.


Dan Rae schrieb:
> 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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