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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rick Karlquist
Sent: 06 December 2005 19:35
To: Discussion of precise time and frequency measurement
Cc: [email protected]
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
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