[time-nuts] 10MHz to 25MHz

Chris Albertson albertson.chris at gmail.com
Wed Jan 18 22:11:42 EST 2017


On Wed, Jan 18, 2017 at 5:40 PM, Loren Moline WA7SKT <lmoline at hotmail.com>
wrote:

> Are you talking about locking the 50MHz VCXO to my 10 MH. Standard? I want
> the 25MHz to be from my 10MHz OCXO which is my station standard which will
> locked to GPS eventually.
>

The 25MHz WOULD be locked to your 10MHz GPSDO if you first locked a 100MHz
or 50MHz to the 10MHz then divided down.   Dividers work really well, they
can improve the phase noise, Multipliers always add phase noise.    Because
of this I have always wondered why we build our "standard" with such a low
frequency.   Why not a 100MHz GPSDO?   Why 10MHz


> Loren WA7SKT
>
>
>
>
> On Wed, Jan 18, 2017 at 4:01 PM -0800, "Richard (Rick) Karlquist" <
> richard at karlquist.com<mailto:richard at karlquist.com>> wrote:
>
>
> A better and easier way is to phase lock a crystal oscillator.
> I would use a 50 MHz VCXO and divide the output by 2 to get a
> 25 MHz square wave.
>
> Rick N6RK
>
> On 1/18/2017 10:28 AM, Loren Moline WA7SKT wrote:
> > Hello,
> >
> > I am looking for a good X5 multiplier to use to generate a 25MHz signal
> from my 10MHz OCXO. I want to divide by 2 and multiply by 5 with a bandpass
> filter in the output and then a 3.3 volt 25MHz signal out.
> >
> >
> > Maybe someone has better ways?
> >
> >
> > Loren Moline  WA7SKT
> >
> > Member: Pacific Northwest VHF Society and ARRL
> > Member: Hearsat Satellite Monitoring Group.  www.uhf-satcom.com
> > Member: CVARS-Chehalis Valley Amateur Radio Society
> > Starchat IRC: Channel = #hearsat
> > RF Electronics: Starchat IRC: Channel = #rfelectronics
> > Grid: CN86mr
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> >
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-- 

Chris Albertson
Redondo Beach, California


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