[time-nuts] HP Z3801A Sale

Magnus Danielson 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:
>    http://support.ntp.org/bin/view/Support/Z3801AReceiverModifications
>
>

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.

Cheers,
Magnus



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