[time-nuts] Looking for an HP K34-59991A Linear Phase Comparator

Jeroen Bastemeijer J.Bastemeijer at EWI.TUDelft.nl
Wed Dec 7 04:51:35 EST 2005


Dear All,

I checked the patentsdatabase, there is another patent form Michael 
Fischer (US6,351,153) which claims to be less sensitive to temperature 
and supply voltage fluctuations. Interesting to read.
Furthermore, when designing electronics, I always keep in mind the 
KISS-principle (Keep It Stupidly Simple). With carefull simple design, 
al lot of effects can be neglected or compensated for. More (expensive) 
electronics, doesn't mean a much better design. Usuallly more 
electronics invite noise and temperature influence instead of cancelling...

Jeroen PE1RGE

Robert Atkinson wrote:

>Hi,
>I've looked at building one of these and it's not quite so trivial to
>duplicate. The speed of the logic is important, the original design used
>ECL. High speed CMOS may be OK but how do you verify performance? The
>original also used an unusual input circuit designed around a
>discontinued line receiver IC. This is critical to performance, any
>variation in threshold will appear as a phase error. I'm continuing to
>prototype a new design and will let you know how I get on.
>I've got a manual on PDF if you need it.
>
>Robert G8RPI.
>
>
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>Behalf Of Rick Karlquist
>Sent: 06 December 2005 19:35
>To: Discussion of precise time and frequency measurement
>Cc: time-nuts at febo.com
>Subject: Re: [time-nuts] Looking for an HP K34-59991A Linear Phase
>Comparator
>
>It is trivial to build your own out of a couple of flip flops.
>You can read Michael Fischer's patent on it (circa 1980).
>
>Rick Karlquist N6RK
>
>
>NE8S wrote:
>  
>
>>Gentlemen:
>>
>>Happy Holidays to All Time, Frequency, and Phase Domainers.
>>
>>I am looking for an HP Linear Phase Comparator, Model K34-59991A. Does
>>anyone have one to sell???
>>
>>Thanks in advance for checking and passing the word for me.
>>
>>Gar Ko
>>NE8S
>>
>>Email Addresses:
>>
>>bionucleonics at southwind.net
>>ne8s at earthlink.net
>>_______________________________________________
>>time-nuts mailing list
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>>
>>
>>    
>>
>
>
>
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-- 
Ing. Jeroen Bastemeijer

Delft University of Technology
Department of Electrical Engineering
Electronic Instrumentation Laboratory
Mekelweg 4, Room 13.090
2628 CD Delft
The Netherlands

Phone: +31.15.27.86542
Fax: +31.15.27.85755
E-mail: J.Bastemeijer at EWI.TUDelft.nl




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