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

[Bob kb8tq]

Hi

This is not a bad way to a feed ( via appropriate limiters) to counters for things
like ADEV. It’s not a very good way to do phase noise …. The floor will be a bit
high and the “folding’ process will make things a bit tough to sort out ….

Bob

> On Jul 29, 2022, at 5:30 PM, ed breya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 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?
> 
> BTW I finally pulled the trigger on acquiring an HP8663A, which I've been wanting to get for a very long time. I've had a fully loaded (all bands) HP11729C for many years, to go with it, and finally be of use. In the TIM department, I have a busted HP5370A, and a good HP5372A.
> 
> Ed
> 
> 
> 
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