[time-nuts] Divider circuit for Rubidium Standard

John Ackermann N8UR jra at febo.com
Wed May 6 12:56:10 UTC 2015


Wenzel has published the schematic of an excellent squaring circuit.  I 
don't have the URL for their version handy, but I used it (with a couple 
of mods) in the TADD-2 and TADD-2 Mini designs.  You can see the 
schematic in the T2-Mini users guide at
http://www.tapr.org/~n8ur/T2_Mini_Manual.pdf.

It will square up signals as low as -20dBm with very low jitter, and 
provides a TTL-compatible output.

John

On 5/6/2015 2:52 AM, Bryan _ wrote:
> Hi Rick:
>
> Any suggestions for a circuit with better performance. Purpose will be a external standard for a frequency counter.
>
> -=Bryan=-
>
>> Date: Mon, 4 May 2015 21:09:51 -0700
>> From: richard at karlquist.com
>> To: time-nuts at febo.com
>> Subject: Re: [time-nuts] Divider circuit for Rubidium Standard
>>
>>
>>
>> On 4/26/2015 3:51 AM, Bryan _ wrote:
>>> All:
>>>
>>> P
>>    I was looking at the project from David partridges web site
>> http://www.perdrix.co.uk/FrequencyDivider/index.html
>>
>>> -=Bryan=- 		 	   		
>>> _______________________________________________
>>>
>>
>> This is a comparator based circuit.  This will give
>> you worse performance than just about anything else,
>> but it may be good enough anyway.
>>
>> Rick Karlquist N6RK
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