[time-nuts] Thunderbolt GPS and frequency divider loading question.

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Aug 14 00:20:51 UTC 2012

Chris Wilson wrote:
>    13/08/2012 22:18
> David Partridge was able to supply one of his last remaining frequency
> dividers to me, for use with my TB GPS standard. It works perfectly
> and is now in a nice enclosure feeding a small array of BNC sockets on my
> shack wall. My question is, if I take the 10 MHz output of the TB into
> David's frequency divider:
> http://www.perdrix.co.uk/FrequencyDivider/index.html
> is it loaded much? Can I T off at the TB 10 MHz output port and feed a
> socket on my distribution panel to see the unadulterated 10 MHz sine
> wave as well as having it feeding the divider? It's very useful as I
> now have a 1 MHZ standard to run my old Racal frequency counter off,
> plus all the other output frequencies. I used to use the 10 MHz output
> of the TB direct to the Racal, but had to remember to do the maths, I
> was a bit surprised 10 MHz worked at all into the external standard
> 1 MHz input port.Thanks.
The frequency divider input is terminated in 50 ohms by a pair of 100 
ohm resistors connected in parallel on the PCB.


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