[time-nuts] Re: Looking to build 10 MHz tp 5 MHz regenerative frequency divider

[DM]

Ed, 
You might look at the paper developed by Luciano Paramithiotti for a 10MHz to 5MHz regenerative divider. He has kindly shared his design, complete with circuit diagram. Might be what you're looking for. 
[ http://www.timeok.it/wp-content/uploads/2015/08/low-noise-regenerative-divider1.pdf | http://www.timeok.it/wp-content/uploads/2015/08/low-noise-regenerative-divider1.pdf ] 

He has lots of other time/frequency related stuff on his website as well. 
http://www.timeok.it/time-and-frequency/ 

Cheers, 
DaveM 


From: "Time-Nuts" <time-nuts at lists.febo.com> 
To: "Time-Nuts" <time-nuts at lists.febo.com> 
Cc: "ed breya" <eb at telight.com> 
Sent: Friday, July 29, 2022 8:30:14 PM 
Subject: [time-nuts] Looking to build 10 MHz tp 5 MHz regenerative frequency divider 

Been busy planning and rounding up parts and subsystems for my 
multi-function box for looking at phase noise and stability etc mostly 
on 10 and 5 MHz. The PN part will be kind of like Erik's recent project, 
using those identical MTI 10 MHz OCXOs (the subject of my recent info 
search) for initial experimenting. The baseband analyzer will be the 
HP3561A (0-100 kHz). 

The other part will be a fairly simple analog DMTD system, with fixed 
100 Hz offset for 10 MHz, and 50 Hz for 5 MHz. I found I have a nice old 
10 MHz OCXO that has mechanical tuning only, that will be committed 
(built in) to this project. It's set now for 9.9999 MHz (10 MHz - 100 
Hz). I have no suitable 5 MHz OCXOs for this, so figured on dividing the 
9.9999 MHz by two when needed. 

I recall many times over the years encountering talk about low noise 
regenerative dividers, but now that I'm actually contemplating making 
one, I can't seem to find much detail. I found a number of commercial 
ones like at Wenzel et al, but not much in the way of design detail. 
John M's ke5fx site has a good example for 80-40-20 MHz, but I can't 
seem to find any of the linked papers and such that were the basis. What 
I'm hoping is to find one or more examples of designs already figured 
out for 10 MHz/2. I think there must be some out there. 

Does anyone know of such? 
Ed 



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