[time-nuts] Buffering the 1pps output from a Z3801A

[Dave Brown]

Peter
All comments so far relate only to the Z3801A. The Trimble Thunderbolt 
has a TTL level 1 pps 10 uSec pulse output on a BNC connector intended 
to be loaded with 50 ohms.  AFAIK there is no ECL level pps output 
available from the Thunderbolt via its 9 pin serial port connector. 
It's cetainly not mentioned in the Thunderbolt documentation if it is.

DaveB, NZ

----- Original Message ----- 
From: "Peter Vince" <pvince at theiet.org>
To: <time-nuts at febo.com>
Sent: Thursday, March 27, 2008 2:29 AM
Subject: [time-nuts] Buffering the 1pps output from a Z3801A


> Bruce, et al,
>
> The 1pps output of an HP Z3801A and Trimble Thunderbolt is
> only available (as far as I know) as a balanced ECL signal on the
> 25-pin connector, with dire warnings in the manuals about not
> earthing either side of the ECL signals.  Would you be able to 
> advise
> on a simple buffer circuit that would allow me to drive the usual
> unbalanced 50-ohm coax please?
>
> Thanks,
>
> Peter Vince  (London, England)
>
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