[time-nuts] Divider circuit for Rubidium Standard

xaos xaos at darksmile.net
Fri May 22 16:27:37 EDT 2015


After reading the posts on this subject I have a question.
First, in my experience I used a rather simple circuit made from
diodes used as limiters and a transistor feeding
a logic inverter. No AGC.

So here is my question. What is the proper circuit to use?
I'd like to do a PSPICE and check things out followed by
a prototype.

I got that a comparator is out, etc.

Cheers,
George H. N2FGX

On 04/26/2015 06:51 AM, Bryan _ wrote:
> All:
>
> Picked up a FE 5680B from Ebay awhile back. Appears to work fine, but is limited to a 1pps output. However there is a point on the PCB that's documented that has a 20Mhz output. There is actually a clean 60Mhz output as well.
>
> http://www.ebay.com/itm/FEI-fe-5680b-rubidium-oscillator-With-1pps-20mhz-output-ONLY-10mhz-NEED-to-MOD-/291419889143?pt=LH_DefaultDomain_0&hash=item43d9fa9df7
>
> I would like to tap this 20mhz output and feed it to a divider/buffer circuit for a 10Mhz output at 50ohm. Can anyone recommend a good schematic for such a purpose. I was looking at the project from David partridges web site http://www.perdrix.co.uk/FrequencyDivider/index.html
>
> Cheers and thanks in advance.
>
> -=Bryan=- 		 	   		  
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