[time-nuts] Self-contained divider board/design available?

[David C. Partridge]

I'll send you my design offline as I don't have any boards left.

If  you want gerbers (four layer), let me know.

Dave 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bert, VE2ZAZ
Sent: 12 March 2010 19:37
To: time-nuts at febo.com
Subject: [time-nuts] Self-contained divider board/design available?

Hello Everyone,

I warn you, this is a topic that has been discussed before...

I enjoyed ko4bb's high level description of oscillator stability measurement
(http://www.ko4bb.com/Timing/FAQ-1.php). Now I am looking into getting or
putting together a self contained divider board that will allow me to make
T.I. measurements at the PPS rate from a 10MHz reference using a HP 5370A
counter. I am sure some of you have such boards. Are there any designs
documented anywhere? Are there PCBs available?

Otherwise, I have a tube full of 74AC163 sync. binary counters I believe
could do the job. Intent was to put a cascade of 8 of these on a board. What
recommendations would you give? I presume output re-timing is required with
these devices since the TC output may have glitches, right? Is a simple NPN
transistor in common-emitter configuration good enough to buffer and scale
the input signal, or should I go for a tuned input? 

When it comes to performance, I understand there is quite a broad range of
possible solutions, from the lousiest to the sharpest. My goal is to have a
resonably good board that can deal with GPS-grade accuracy/stability. I
don't intend to make atomic-level stability measurements (at least not for
now, but who knows in the future...). ADEV measurement on GPS receivers,
generators and oscillators is the objective.

As you can see, this brings you back to basics. This is where I will start
implementing T.I. measurements from...

Thanks in advance,

Bert.
ps. please also reply direct, as I subscribe to Time-Nuts in the digest
mode.



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