[time-nuts] 10MHz to 32MHz?

John Miles jmiles at pop.net
Sat Apr 21 19:00:37 EDT 2007


One solution: double the 10 MHz twice to get 40 MHz, divide by 5 with any
handy 74HC or 74F counter to get 8 MHz, and mix that with the 40 MHz signal
to get 32 MHz and 48 MHz.  Basic LC filtering should be adequate in the
10->40 MHz multiplier and the 32 MHz output sections.

Another solution: drive an AD9852 DDS with the 10 MHz, and pick a
clock-multiplier setting that gives the best SFDR near 32 MHz.  That only
requires two chips, but one of them would have to be a microcontroller.

-- john, KE5FX


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of John Ackermann N8UR
> Sent: Saturday, April 21, 2007 2:11 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10MHz to 32MHz?
>
>
> You might look at using a Reflock II
> (http://www.tapr.org/kits_reflock_ii) to discipline a 32MHz VCXO from
> your 10MHz.  Unfortunately, the Clock-Block phase noise is nowhere near
> good enough to use for an RF application, so that's not an option. :-(
>
> 73,
> John
> ----
>
> Bruce Lane said the following on 04/21/2007 02:26 PM:
> > Fellow time-clockers,
> >
> > 	I have an interesting (if a bit annoying) situation. I
> would like to use one of my existing GPS standards to improve
> stability on one of my HF transceivers. The problem is that said
> transceiver, for reasons unknown to me, uses a 32MHz reference oscillator.
> >
> > 	The highest GPS-lock frequency I have available is 10MHz.
> Suggestions for using this to produce a 32MHz reference would be
> welcome, as my skills for this kind of design are a bit rusty.
> >
> > 	Thanks much.
> >
> >
> > -=-=-=-=-=-=-=-=-=-=-=-
> > Bruce Lane, Owner & Head Hardware Heavy,
> > Blue Feather Technologies -- http://www.bluefeathertech.com
> > kyrrin (at) bluefeathertech do/t c=o=m
> > "If Salvador Dali had owned a computer, would it have been
> equipped with surreal ports?"
> >
> >
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> >
>
>
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