[time-nuts] Divider circuit for Rubidium Standard

[Bryan _]

I was the OP and the reason for the whole exercise is to take a Rubidium standard that only outputs 1pps and modify for use as 10MHz. With some research there is a 20Mhz source onboard, issue is the sine is not very clean at 20MHz (60MHZ as well, much cleaner and may be worth inputting straight to logic). Thus the need for a divider circuit to divide down to 10Mhz. The purpose is to create a bench standard for hobby use and a external 10MHz reference for a HP 53131A

Pics of the waveforms (not my pics but my results are the same)

http://1drv.ms/1HB0Nwn



-=Bryan=-

> From: kb8tq at n1k.org
> Date: Fri, 22 May 2015 17:31:47 -0400
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Divider circuit for Rubidium Standard
> 
> Hi
> 
> What is your objective? Put another way:
> 
> 1)  How clean is your sine wave source? 
> 2) What frequency (or range) are you trying to convert?
> 3) What level range are you trying to work with?
> 4) What is it going into (how clean is the next stage)?
> 
> If you have an optical fountain that is good to 1x10^-15 at 1 second, and
> you are trying to map Pluto with a radar in your back yard, the answer will
> be a bit different than if you are starting with a surplus OCXO and trying 
> to drive a 5334 :)
> 
> Bob
> 
> > On May 22, 2015, at 4:27 PM, xaos <xaos at darksmile.net> wrote:
> > 
> > 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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