[time-nuts] Adding prescaler to HP 5334B

Didier Juges didier at cox.net
Tue Apr 1 00:59:23 EDT 2008

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Bruce Griffiths
> Sent: Monday, March 31, 2008 11:28 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Adding prescaler to HP 5334B
> Didier Juges wrote:
> > I don't believe these are RF detectors, they look like 
> switching diodes.
> >
> > Even though they are Shottkys, the spec says they have a 
> 5nS reverse 
> > recovery time ???
> >
> > That would be too slow for a 1 GHz counter.
> >
> > I use a lot of BAV99, and while not being Shottkys, they have about 
> > the same reverse recovery and 15% of the capacitance.
> >
> > Didier KO4BB
> >   
> Didier
> HSMS282X series appears usable to 4GHz.
> HMPS282X series are usable to 6GHz.
> Mouser carry some of these.
> Bruce

RF Basic Store on eBay has them, I just bought a few varactors and National
Semi PLL chips for my 2.3 GHz PLL project from him, and I did not think of
checking for Schottkys...

They are just a few $ for 100 pcs, except that he only has common anode and
common cathode at the moment, so maybe Mouser is a better bet.

Interestingly, Mouser crosses the BAT54S to the HSMS-2822, they are not even
in the same ballpark. I wonder what kind of application could use either...

Thanks Bruce,


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