[time-nuts] Any simple way to get 200 MHz from 10 MHz?
docdailey at gmail.com
Sun Sep 28 07:40:35 EDT 2014
I use this for my qs1r (125MHz) and to discipline a sound card (24.576MHz).
I actually have one 5007 sandwiched between two 3008's within a Hammond enclosure I built. Has voltage in, 10MHz in and two frequency outputs.
I don't have the setup to measure phase noise but seems to do a decent job for my purposes.
Sent from my iPad
> On Sep 28, 2014, at 5:24 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> I am looking for a quick & simple way to create a frequency of 200 MHz from
> 10 MHz. Actually 100, 200, 300 or 400 MHz would all work, but 200 MHz
> would be my preference.
> The input will be around 0 to +10 dBm and the output needs to be about +13
> I did think of a x5 & x4 frequency multipliers and amplifiers from
> Minicircuits, but I don't know if the increase in phase noise might be a
> problem. The truth is I don't know how good it needs to be!
> I am trying to find a way of building something that will allow my HP 8720D
> VNA (50 MHz-20 GHz) to work below 50 MHz. My idea was to generate a 200 MHz
> local oscillator to feed a mixer.
> I was thinking of making it so as the VNA sweeps from 200.01-250 MHz, itthi
> possible to analyse a DUT over the frequency range 0.01-50 MHz.
> Having the an integer multiple of 100 MHz is good, as it makes reading the
> VNA easier. It is simpler to use if the VNA display shows the frequency 200
> MHz off than if its 212.5564 MHz wrong.
> I would rather not have to program anything to do it, but maybe a VCO and
> PLL is the only sensible approach.
> I can't seem to find an off the shelf solution which I can lock to a 10 MHz
> reference. There are plenty of 200 MHz oscillators around based on a TCXO,
> but I can't lock them to the 10 MHz oscillator the VNA uses. Maybe someone
> knows of a device I don't know of.
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