[time-nuts] Locking gunn diode

[Normand Martel]

Some time ago, i've found documentation on microwave
prescalers, (from Hewlett-Packard/Agilent) that could
count up to 18 GHz.

Tonight, i've found those SiGe prescalers from NEC:

µPB1510GV .5-3 GHz div. by 4 prescaler:
http://www.ncsd.necel.com/microwave/english/pdf/PU10311EJ01V0DS.pdf

µPB1512TU 5-13 GHz div. by 8 prescaler:
http://www.ncsd.necel.com/microwave/english/pdf/PU10537EJ02V0DS.pdf

µPB1514TU 8-16 GHz div. by 8 prescaler:
http://www.ncsd.necel.com/microwave/english/pdf/PU10541EJ02V0DS.pdf

Bizarre that no prescalers have been developed to work
on the 3-5 GHz band...

>From Agilent, i've found the following differential
in/out 16 GHz prescalers (based on the HMMC-31xx /2 /4
and /8 12/16GHz prescalers):

www.avagotech.com/assets/downloadDocument.do?id=528

Nothing indicates a minimum working frequency, if it
can go down to the sub-GHz, that could be an
interesting product.

On another site, i saw that the HMMC-3102 3104 and
3108 prescalers cover from 500 MHz up to 16 GHz. 

Link:
http://www.datasheetcatalog.com/catalog/p382200.shtml

73 de Normand VE2UM
Montreal, Qc. Canada

--- David Forbes <dforbes at dakotacom.net> wrote:

> At 5:11 PM +0000 12/18/06, stork3264 at comcast.net
> wrote:
> >12-18-06
> >
> >Is it possible to lock a 10ghz gunn diode
> transceiver (supply 
> >voltage 10.00 vdc) to a 10 mhz standard?  Signal
> applied to either 
> >gunn diode or varactor supply voltages.
> >
> >Rick
> 
> Rick,
> 
> Sure it's possible. I work on radiotelescopes that
> use 100 GHz gunn 
> diode oscillators, phase-locked using a box called
> the STS XL-800. 
> Unfotunately, those boxes cost several thousand
> dollars and aren't 
> readily available on ebay.
> 
> The basic method is the same as any
> voltage-controlled oscilator, but 
> you have to supply a good bit of current to the
> diode and you need to 
> have a well-controlled driver so that you don't burn
> it out.
> 
> The usual method of sampling the Gunn frequency is
> to mix it down 
> using a harmonic mixer to produce an IF frequency
> that's usable in a 
> generic PLL, some tens of megahertz.
> 
> All of the above is a rather complicated piece of
> hardware by the 
> time you're done. It's not a task for the timid.
> 
> -- 
> 
> --David Forbes, Tucson, AZ
> http://www.cathodecorner.com/
> 
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