[time-nuts] HP Z3801A Sale
magnus at rubidium.dyndns.org
Sat Mar 31 12:10:10 UTC 2012
On 03/31/2012 08:11 AM, Hal Murray wrote:
>> There really is nothing much to this "modification." The Z3801A is already
>> 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 a few
>> zero-ohm SMD resistors and solder in a header strip. The simple procedure
>> 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
> an ohm-meter.
> Here is another URL in case you want a second opinion:
The modification is trivial and recommended.
Has anyone figured out the other modifications possible? There's a
second FPGA to drop in, I just haven't bothered to try that. There seems
to be a secondary serial port available.
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