[time-nuts] HP Z3801A Sale
wb6fly at verizon.net
Sat Mar 31 15:21:33 UTC 2012
The beauty of the header strips is that the Z3801A can easily and quickly be
converted back to RS-422 in the future, without having to partially
dismantle the unit and do more soldering- again.
73, Eric Lemmon WB6FLY
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Friday, March 30, 2012 11:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP Z3801A Sale
> There really is nothing much to this "modification." The Z3801A is
> designed to easily work on either interface, but most units are configured
> for RS-422 as the default. It takes perhaps a half-hour to remove some
> zero-ohm SMD resistors and solder in a few header strips. The simple
> is described and illustrated here: <www.ad6a.com/Z3801A.html>
You don't need the header strip. There are empty slots waiting for some of
the 0-ohm jumpers you have to remove.
I think they are the three to the right of the circle in figure-13 of the
above URL. You can work out which is which by following the traces or using
Here is another URL in case you want a second opinion:
These are my opinions, not necessarily my employer's. I hate spam.
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