[time-nuts] HP Z3805A com port and monitoring questions

Ulrich Bangert df6jb at ulrich-bangert.de
Mon Oct 15 01:43:45 EDT 2012


> There's another telco model that has an MTI 260 oscillator, that I 
> think was manufactured in Korea but does not have the Samsung logo on 
> the front.  I don't know much about that one.

I do own a Z3805 WITH the Samsung logo on the front AND WITH a MTI 260 inside.

Regards
Ulrich Bangert

> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Said Jackson
> Gesendet: Montag, 15. Oktober 2012 00:16
> An: Discussion of precise time and frequency measurement
> Cc: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] HP Z3805A com port and monitoring questions
> 
> 
> John,
> 
> I believe Edgardo bought the reprogrammed 58503A unit (was a 
> Z3805A before) from Ebay.
> 
> I have the same units recently purchased from yinxhu(sp?) on 
> Ebay and Edgardo just confirmed these are indeed 16 channel 
> units with true 10811 Docxos.
> 
> Explains why they work so great..
> 
> Edgardo, I use GPSCon with these, and mine are all Rs232..
> 
> Mine achieve performance in the xE-013 and noise below 
> -162dBc (Thunderbolt eat your heart out :). I believe there 
> is no better GPSDO out there presently, much less available 
> for sale and at those prices. PN at 1Hz is better than -105dBc..
> 
> I regularly get below 1us predicted drift as shown by the 
> syst:stat? command.
> 
> Bye,
> Said
> 
> 
> 
> On Oct 14, 2012, at 10:24, John Ackermann N8UR <jra at febo.com> wrote:
> 
> > Hi Edgardo --
> > 
> > I don't know a lot about the Z3805 variations other than what's on 
> > fluke.l's site, which can be a bit confusing.  All were 
> made by (for) 
> > HP/Agilent/Symmetricom, but there were apparently at least two 
> > "official" variations.
> > 
> > Mine is the Samsung version, which has the same 10811A 
> double oven as 
> > the Z3801, and a 16 channel Furuno GPS, 2 x 10 MHz and 2 x 
> 1 PPS, and 
> > dual comm ports.  It's still aging in, but it seems to 
> perform about 
> > the same as my older Z3801A, with stability below 1e12 from 
> 1 second 
> > on out.
> > 
> > There's another telco model that has an MTI 260 oscillator, that I 
> > think was manufactured in Korea but does not have the 
> Samsung logo on 
> > the front.  I don't know much about that one.
> > 
> > Then there's the one that's boxed up like a 58503A bench 
> unit, which I 
> > think is not directly from HP/Agilent/Symmetricom, but is a 
> telco unit 
> > repackaged by someone in China.  I'm not sure what's in 
> there.  One of 
> > the ones on eBay right now says that it has a 6 channel 
> receiver, and 
> > was "upgraded by us which the feature is the same as 58503A".  Good 
> > luck figuring out what's in that one...  (by the way, none of the 
> > current listings are from fluke.l)
> > 
> > John
> > ----
> > 
> > Edgardo Molina said the following on 10/14/2012 12:29 PM:
> >> Dear John,
> >> 
> >> Very interesting. I haven't had the time to compare the Samsung 
> >> branded units with the typical HP units. Mine is the 
> later. It only 
> >> has one communications port, plus 2x10 MHz and 2x 1PPS. As 
> soon as I 
> >> am done with the late family breakfast I will do some 
> testing and let 
> >> you know what I find.
> >> 
> >> How does the oscillators from the Samsung units compare to the HP 
> >> units? Are the Samsung units superior in any sense? Both have the 
> >> same GPS receiver/number of channels?
> >> 
> >> Thank you for opening my curiosity regarding this GPSDO model.
> >> 
> >> Best regards!
> >> 
> >> 
> >> 
> >> Edgardo Molina
> >> Dirección IPTEL
> >> 
> >> www.iptel.net.mx
> >> 
> >> T : 55 55 55202444
> >> M : 04455 20501854
> >> 
> >> Piensa en Bits SA de CV
> >> 
> >> 
> >> 
> >> Información anexa:
> >> 
> >> 
> >> 
> >> 
> >> CONFIDENCIALIDAD DE INFORMACION
> >> 
> >> Este mensaje tiene carácter confidencial. Si usted no es el 
> >> destinarario de este mensaje, le suplicamos se lo notifique al 
> >> remitente mediante un correo electrónico y que borre el presente 
> >> mensaje y sus anexos de su computadora sin retener una 
> copia de los 
> >> mismos. Queda estrictamente prohibido copiar este mensaje o hacer 
> >> usode el para cualquier propósito o divulgar su en forma parcial o 
> >> total su contenido. Gracias.
> >> 
> >> 
> >> NON-DISCLOSURE OF INFORMATION
> >> 
> >> This email is strictly confidential and may also be privileged. If 
> >> you are not the intended recipient please immediately advise the 
> >> sender by replying to this e-mail and then deleting the 
> message and 
> >> its attachments from your computer without keeping a copy. It is 
> >> strictly forbidden to copy it or use it for any purpose or 
> disclose 
> >> its contents to any third party. Thank you.
> >> 
> >> 
> >> 
> >> 
> >> 
> >> On Oct 14, 2012, at 8:23 AM, John Ackermann N8UR <jra at febo.com> 
> >> wrote:
> >> 
> >>> On the unit I bought from fluke.l, with a "Samsung" 
> label, there are 
> >>> two serial ports.  The bottom one is the control port and is 
> >>> definitely RS-232.  The top port has only three wires 
> (TXD, RXD, SG) 
> >>> and I think is used for some sort of monitoring.
> >>> 
> >>> I've been using Ulrich's "z38xx" software to monitor it with good 
> >>> success.
> >>> 
> >>> John
> >>> ----
> >>> 
> >>> Edgardo Molina said the following on 10/13/2012 10:18 PM:
> >>>> Dear Group,
> >>>> 
> >>>> Good evening. I bought two HP Z3805A units a few weeks ago. They 
> >>>> were bare units without antenna or power supply. After 
> struggling 
> >>>> to find a suitable 24V 3A noise free power supply for 
> each of them, 
> >>>> I mounted a couple of Symmetricom antennas and just 
> fired them up.
> >>>> 
> >>>> After around 25 minutes, the GPS Lock light lighted up. As the 
> >>>> manual for this particular model is unobtainable in several 
> >>>> searches through the Internet, I found that the readily 
> available 
> >>>> manual for the Z3801A would cover much of the Z3905A 
> operation. I 
> >>>> also got a software for monitoring the operation from BD Systems 
> >>>> Inc. In Colorado. Now that I am sure both are operating 
> and locked 
> >>>> only by looking at the front panel lights, I would like to ask a 
> >>>> couple of questions regarding their communication to the PC.
> >>>> 
> >>>> 1. Is the DB-25 serial port carrying RS-232 signals? I 
> see the port 
> >>>> of the Z380A1 is different: RS-422. 2. If the port is 
> plain RS-232 
> >>>> is it possible to use a Serial to USB adapter? I have 
> heard about 
> >>>> the inconsistencies that such an adapter could cause 
> when used with 
> >>>> a TBolt. Should I assume this is the same case with the 
> Z3805A? 3. 
> >>>> There was once a project for building a TBolt state 
> monitor on a 2 
> >>>> line LCD screen. I own three of those monitors and they are just 
> >>>> great.  Is there an equivalent for these HP GPS units?
> >>>> 
> >>>> Any suggestions for the operation of these units and your ever 
> >>>> expert and kind advise is always welcome. You all have a nice 
> >>>> weekend!
> >>>> 
> >>>> Kindest regards,
> >>>> 
> >>>> 
> >>>> 
> >>>> Edgardo Molina
> >>>> Dirección IPTEL
> >>>> 
> >>>> www.iptel.net.mx
> >>>> 
> >>>> T : 55 55 55202444
> >>>> M : 04455 20501854
> >>>> 
> >>>> Piensa en Bits SA de CV
> >>>> 
> >>>> 
> >>>> 
> >>>> Información anexa:
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> CONFIDENCIALIDAD DE INFORMACION
> >>>> 
> >>>> Este mensaje tiene carácter confidencial. Si usted no es el 
> >>>> destinarario de este mensaje, le suplicamos se lo notifique al 
> >>>> remitente mediante un correo electrónico y que borre el presente 
> >>>> mensaje y sus anexos de su computadora sin retener una 
> copia de los 
> >>>> mismos. Queda estrictamente prohibido copiar este 
> mensaje o hacer 
> >>>> usode el para cualquier propósito o divulgar su en forma 
> parcial o 
> >>>> total su contenido. Gracias.
> >>>> 
> >>>> 
> >>>> NON-DISCLOSURE OF INFORMATION
> >>>> 
> >>>> This email is strictly confidential and may also be 
> privileged. If 
> >>>> you are not the intended recipient please immediately advise the 
> >>>> sender by replying to this e-mail and then deleting the 
> message and 
> >>>> its attachments from your computer without keeping a copy. It is 
> >>>> strictly forbidden to copy it or use it for any purpose 
> or disclose 
> >>>> its contents to any third party. Thank you.
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> 
> >>>> _______________________________________________
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> >> 
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