[time-nuts] HP Z3801A Sale

d.seiter at comcast.net d.seiter at comcast.net
Sat Mar 31 19:07:35 UTC 2012


While not a true modification, my Z3801A has an external time/date display. 

-Dave 

----- Original Message -----
From: "Magnus Danielson" <magnus at rubidium.dyndns.org> 
To: time-nuts at febo.com 
Sent: Saturday, March 31, 2012 5:10:10 AM 
Subject: Re: [time-nuts] HP Z3801A Sale 

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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