>Hal Murray hmurray at megapathdsl.net
>"Would you please say more? Or post pictures?
>
>Where did you find a 200 ms PPS pulse?"
The circuitry I added takes the narrow positive going timing pulse
(2V/25us) on pin 2 of the surface mounted Lucent 1141 IC (U5)
near the DB25 output connector on the
On 3/31/12 3:24 PM, Hal Murray wrote:
jim...@earthlink.net said:
I can't see ever changing mine back. I could see going in and modifying it
to put a USB/serial dongle inside, so it would have a USB jack on it, since
serial ports are become less common.
I have several USB-Serial dongles.
jim...@earthlink.net said:
> I can't see ever changing mine back. I could see going in and modifying it
> to put a USB/serial dongle inside, so it would have a USB jack on it, since
> serial ports are become less common.
I have several USB-Serial dongles. I can't see bothering to install on
On 3/31/12 8:21 AM, Eric Lemmon wrote:
Hal,
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.
true, but you have to remove the board from the case to
golgarfrinc...@yahoo.com said:
> About 10 years ago I added a true ~200ms PPS LED to existing holes in the
> circuit board on the front panel plus a BNC connector to bring the same TTL
> level signal out the back of the unit.
Would you please say more? Or post pictures?
Where did you find a 20
While not a true modification, my Z3801A has an external time/date display.
-Dave
- Original Message -
From: "Magnus Danielson"
To: time-nuts@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 Mu
-nuts-boun...@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
already
> designed to easil
>"Has anyone figured out the other modifications possible?"
About 10 years ago I added a true ~200ms PPS LED to existing holes in the
circuit board on the front panel plus a BNC connector to bring the same TTL
level signal out the back of the unit.
__
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 so
> 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 p
On 3/30/12 8:43 PM, Larry McDavid wrote:
On 2/16/2012 Brad Stockdale announced here on Time-Nuts that he had a HP
Z3801A GPSDO for sale. I corresponded with Brad several times and he
reported that he sold one Z3801A to a list member and that this unit had
been modified to provide RS-232 rather th
The simple procedure
is described and illustrated here:
73, Eric Lemmon WB6FLY
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Larry McDavid
Sent: Friday, March 30, 2012 8:44 PM
To: Timenuts
Subject: [time-nuts] HP Z3801A Sale
On 2/16
On 2/16/2012 Brad Stockdale announced here on Time-Nuts that he had a HP
Z3801A GPSDO for sale. I corresponded with Brad several times and he
reported that he sold one Z3801A to a list member and that this unit had
been modified to provide RS-232 rather than RS-422.
Brian subsequently sold me
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