[time-nuts] [Bulk] Re: Ultra High Stability Time Base Options for 53132A
J. L. Trantham
jltran at att.net
Mon Apr 13 08:03:55 EDT 2015
Fuzzy page 13 is the 53132-60011, with the extra components not found on the 53132-60016, which is on page 45 and much clearer. It is an LM361M and is on both boards.
Now that I have the 53132-60011 board, I plan to start with page 45 and 're-draw' a clear page 13.
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Richard (Rick) Karlquist
Sent: Sunday, April 12, 2015 6:49 PM
To: Discussion of precise time and frequency measurement
Cc: magnus at rubidium.se
Subject: [Bulk] Re: [time-nuts] Ultra High Stability Time Base Options for 53132A
The resolution of page 13 is poor, and it seems to be a bitmap instead of a vector file. The fuzzy thing in the lower right corner looks like it might be a comparator. I think this was the smoking gun.
There was a saying by H.L. Menken to the effect that for every complex problem, there is a simple, obvious, invalid solution.
Squaring up a 10811 with a comparator is a perfect example of this principle. Non-time-nuts always seem to gravitate to this design.
Of course you're right, any comparator will add jitter to a 10811.
The faster they are, the more jitter they add.
I noticed that the standard 10 MHz oscillator is built with an ECL line receiver. Another example of Menken's saying.
This is a TERRIBLE oscillator design, but one that would appeal to the non-initiated. I built one of these oscillators in 1976 at the suggestion of my boss. After seeing how bad it was, I quietly designed it out and never used it again.
Rick Karlquist N6RK
time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the time-nuts