Hello all,
After some time and some twists and turns in life, I've found time
to work with my GPSDO's again. I've added two Z3815A's to my
collection, after wanting to do so for a number of years. After
reading through the listserv's historical posts to re-acquaint myself
with the units (and
This Time-Nuts (archive) thread from January 2010 may be helpful.
Some of this information came from i.fluke (eBay reseller from East Asia)
https://www.febo.com/pipermail/time-nuts/2010-January/043928.html
Originally designed by HP, and made under licence by Chongho in Korea, the
Z3815A used the
On 2/26/2016 12:58 PM, Dickson Fu wrote:
Hi all,
A bit frustrated with my newly bought Z3815A. After power up, the "Block"
indicator stays lit and no other LED turns on except Power indicator. It
appears that GPS has never discipling.
I cannot find any user manual for Z3815A and other hp
Hi all,
A bit frustrated with my newly bought Z3815A. After power up, the "Block"
indicator stays lit and no other LED turns on except Power indicator. It
appears that GPS has never discipling.
I cannot find any user manual for Z3815A and other hp smartclock does not
have the same front panel
On 26/01/14 02:33, Morris Odell wrote:
Thanks for the reply Magnus. I know the frequency control function is
unaffected by the date problem but I'm far too obsessional to ignore it :-)
I contemplated the AVR solution to correct the code but once I looked at the
output of the receiver with a
On 24/01/14 11:59, Morris Odell wrote:
Hi all,
There was some consternation here 5 months ago when Z3815A GPSDOs began
reporting a date 1024 weeks in the past. This was due to a storage overflow
condition in the Furuno GPS receiver in the Z3915A. The designers probably
never anticipated that
Thanks for the reply Magnus. I know the frequency control function is
unaffected by the date problem but I'm far too obsessional to ignore it :-)
I contemplated the AVR solution to correct the code but once I looked at the
output of the receiver with a MAX232 as suggested here, I found there were
Hi all,
There was some consternation here 5 months ago when Z3815A GPSDOs began
reporting a date 1024 weeks in the past. This was due to a storage overflow
condition in the Furuno GPS receiver in the Z3915A. The designers probably
never anticipated that they would still be in use 20 years
Hi all,
The Z3815A is working perfectly with the new receiver except for a
persistent antenna alarm. The new receiver is reporting the antenna is OK
but it must have a different self-test answer sentence to the old one. The
self-test is a PFEC sentence, which is proprietary to the manufacturer
Hi Morris,
You should be able to bridge one of the TTL to RS-232 ports on a MAX232
onto the line from the Z3815A to the GT-8031. This will let you capture
the commands the Z3815A sends by using any terminal program. Similarly,
if you bridge onto the line from the GT-8031 to the Z3815A you
I noticed my Z3815A was show 0ns (zero) for predicted uncertainty tonight.
Is there something wrong or is its predicted holdover uncertainty below
measureable (displayable) value?
Is there a pForth command that would give me an accurate figure for PHU?
My 5 other Z3805A smartclocks are all in
Hi
The holdover prediction is entirely dependent on the OCXO and how it's
behaving. Your OCXO likely had a pair of events that caused the aging estimate
to get very low.
Bob
On Jun 28, 2013, at 8:16 AM, Mark C. Stephens ma...@non-stop.com.au wrote:
I noticed my Z3815A was show 0ns (zero)
My Z3815A has never shown a holdover prediction in the ns range...
maybe it needs a very long running time (years) to adjust the
SmartClock parameters. Mine has been on for only 1 year.
On Fri, Jun 28, 2013 at 2:25 PM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
marki wrote:
I
[mailto:time-nuts-boun...@febo.com] On Behalf
Of Charles P. Steinmetz
Sent: Friday, 28 June 2013 10:26 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A show 0ns Predicted uncertainty
marki wrote:
I noticed my Z3815A was show 0ns (zero) for predicted uncertainty
2013 12:46 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A show 0ns Predicted uncertainty
marki wrote:
My Z3805A are usually in the 1-4us range.
I was pleasantly surprised to see the nanoseconds!
I must ask, do you have the later Z3805A with the MTI
In message 95e6ce90-5629-4a8b-900f-7f32ccc22...@rtty.us, Bob Camp writes:
Well if the Z3815 boxes are all fakes, they did a *really* good
job on making up all the HP logo's and HP stickers. They even faked
the right date codes for the add on stickers. They also did a very
nice job with the custom
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
On Behalf Of Magnus Danielson
Sent: Thursday, 6 June 2013 7:23 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3815A pinout
On 06/05/2013 11:16 PM, Bob Camp wrote:
Hi
There are two very different
: Thursday, 6 June 2013 8:46 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A pinout
Hi
What I'm pointing out is that there are indeed *real* HP made Z3815A's in
boxes. Ones without the crud, corrosion, flying soldered leads, and the like.
Bob
On Jun 6
Fellow time-nuts,
There used to be a PDF around with details of pin-out and modifications
for the Z3815A. I fail to locate it at any of the usual places,
including google, Didier, TVB, Brooke etc...
I fail to find it in any of my archives as well.
I would appreciate if someone could share a
to 1/3
the price of the other ones...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Wednesday, June 05, 2013 4:59 PM
To: time-nuts@febo.com
Subject: [time-nuts] Z3815A pinout
Fellow time-nuts,
There used
On 06/05/2013 11:16 PM, Bob Camp wrote:
Hi
There are two very different 3815's out there. One comes in a nice box with
rational connectors on it. (They are expensive). The other one is the plug
in card that always seems to need a good scrub down. It appears to have the
same stuff but connecting
Sent: Thursday, 6 June 2013 7:23 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3815A pinout
On 06/05/2013 11:16 PM, Bob Camp wrote:
Hi
There are two very different 3815's out there. One comes in a nice box
with rational connectors on it. (They are expensive). The other one is
the plug
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Thursday, 6 June 2013 7:23 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3815A pinout
On 06/05/2013 11:16 PM, Bob Camp wrote:
Hi
There are two very different 3815's out
and frequency measurement
Subject: Re: [time-nuts] Z3815A pinout
Hi
Well if the Z3815 boxes are all fakes, they did a *really* good job on making
up all the HP logo's and HP stickers. They even faked the right date codes for
the add on stickers. They also did a very nice job with the custom cables
: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Azelio Boriani
Sent: Thursday, 30 May 2013 5:40 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
This is an excerpt of my Z3815A's efc_rep:
efc_rep
5537.347168 680715.5 3
Of Mark C. Stephens
Sent: Thursday, 30 May 2013 4:14 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
I ran efc_comp and the efc table is slowly filling!
p4th D efc_rep
1.115185 672147.2 1 6.721472e+05 0.00e+00 0.00e+00
2.115185 672145.6 1
-boun...@febo.com] On Behalf
Of Mark C. Stephens
Sent: Wednesday, 29 May 2013 12:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
I believe these were all rescued from the Tip (Dump, Trash) judging by the
water damage and bent cases.
Mine had been
for the e1398a OCXO?
-marki
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark C. Stephens
Sent: Wednesday, 29 May 2013 12:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
I
Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark C. Stephens
Sent: Wednesday, 29 May 2013 12:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
I believe these were all rescued from the Tip (Dump, Trash
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
On Behalf Of Mark C. Stephens
Sent: Wednesday, 29 May 2013 12:36 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
I believe these were all rescued from the Tip
: Wednesday, 29 May 2013 9:03 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
Hi
Well, probably as good as the manual ... we have the guy who designed it (Rick
Karlquist) lurking around here somewhere. I don't think I've ever seen a manual.
How long have
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Azelio Boriani
Sent: Wednesday, 29 May 2013 11:09 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
The Z3815A here has (right now) 3.4us
...@febo.com] On
Behalf Of Azelio Boriani
Sent: Wednesday, 29 May 2013 11:09 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
The Z3815A here has (right now) 3.4us/24h of holdover uncertainty and -7.0ns
PPS relative to GPS. The health monitor
Sent: Thursday, 30 May 2013 12:00 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
Here the figures are the same, except: start ptr is 24 and stop ptr is
23 and last efc average is 680694.8 and not 0.0
On Wed, May 29, 2013 at 3:53 PM, Azelio Boriani
: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark C. Stephens
Sent: Wednesday, May 29, 2013 12:02 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
Hmm, Something is awry with this particular Z3815A:
e.g.
p4th D efc_rep
-nuts-boun...@febo.com] On
Behalf Of Azelio Boriani
Sent: Thursday, 30 May 2013 12:00 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
Here the figures are the same, except: start ptr is 24 and stop ptr is
23 and last efc average is 680694.8 and not 0.0
Watch Out, I got hold of one..
I have powered it up and its drawing 52W @ 24v.
My question is, What is the input voltage range on the Z3815A?
Also, one for those familiar with the Z3815A,
Holdover Uncertainty Predict: is showing 2 dashes ( -- )
From my experience with the Z380x clocks this
, the power drops quite a bit after warm up.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Mark C. Stephens
Sent: Tuesday, May 28, 2013 11:58 AM
To: time-nuts@febo.com
Subject: [time-nuts] Z3815A
Watch Out, I got hold of one..
I
[mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent: Wednesday, 29 May 2013 2:36 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Z3815A
Hi
That's more power that it should be pulling. It *should* be happy on anything
from about 20 to 60 volts. I
] On
Behalf Of Mark C. Stephens
Sent: Tuesday, May 28, 2013 1:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A
Bob, Its settled down to around 1.3A @ 24V now.
I'll up the volts to 28 and see wat happens then.
Trying to trace where Port 1 comes out.
Port 2
Your Z3815A may need more cooling than it's getting, especially if you have
it resting horizontally as it looks like it should. I bought one of
those kits from China about a year and a half ago. Powered it up, waited
for it to lock ... and it was dead within a week, with the unmistakable
smell
I'm powering my Z3815A from 48V, the telecom standard voltage.
On Wed, May 29, 2013 at 12:12 AM, Stewart Cobb stewart.c...@gmail.com wrote:
Your Z3815A may need more cooling than it's getting, especially if you have
it resting horizontally as it looks like it should. I bought one of
those
I'm powering my Z3815A from 48V, the telecom standard voltage.
The Z3801A is available in two ranges:
27V nominal, 19-30V, 23 starting
54V nominal, 37-60V, 46 starting
Who uses 24V? What do cell phone towers use?
--
These are my opinions. I hate spam.
8:13 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3815A
Your Z3815A may need more cooling than it's getting, especially if you have it
resting horizontally as it looks like it should. I bought one of those kits
from China about a year and a half ago. Powered it up, waited for it to lock
Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If
there are many outputs they must always be the same. When the GPS has the
3D fix (or the position hold) and the algorithm has synchronized the OCXO,
the 10MHz can be said locked but, when speaking about GPSDO, the correct
word
Not every GPSDO has a 10MHz OCXO.
5MHz is, or was, quite common, and I've come across at least one GPSDO
with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned
out to be based on a 5MHz unit.
Then there's the variant of the Trak Microwave 8821B, as just one
Not every GPSDO has a 10MHz OCXO.
That is certainly true although from a time-nuts point of view, 10Mhz is
certainly
a very nice number. I have linked to a photo of both sides of a Trimble 1.5x5
GPSDO built about 2008 that has a 1 square Trimble branded OXCO that has
a 76.80Mhz as well
10MHz would have certainly been more useful to me as a reference source
for test gear, my original intention, than the 2.048MHz I ended up with.
Nice easy divide down to 1or 2 KHz though, if only I could find a use for
that:-)
Those photos are of a Trimble Mini-T, I didn't realise they did
Nigel,
you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for
phase locking a 10 MHz oscillator with your GPS box.
Adrian
gandal...@aol.com schrieb:
Not every GPSDO has a 10MHz OCXO.
5MHz is, or was, quite common, and I've come across at least one GPSDO
with a 10MHz
Not necessary in the Z3815A: it has already a 10MHz output. There are 3 SMB
connectors near the rear connector, they are labelled so it should be easy
for you to locate the 10MHz and the PPS output. Now I can't open my Z3815A
to help, it is in use but from the picture found in Internet I see that
Hi Adrian
Yes, I decided that too and may well try it sometime, although it's quite
well down the to do pile right now, and it's even made slightly easier as
it's already divided down internally to 2.048MHz:-)
Ironically, when I bought the Trak unit I already had a 2.048MHz master
Hi Nigel,
Then there's the variant of the Trak Microwave 8821B, as just one
example,
that uses a 16.384MHz OCXO from which they derive a 2.048MHz output
without 10MHz anywhere in sight.
When I bought one of those a few years ago I assumed that all 8821Bs
would
be 10MHz GPSDOs, or some
In ZL1BPU's GPSR-A User Manual, it mentions that there are internal points
that provide access to regenerated system 1pps, 10MHz and 19.6608MHz square
wave signals which are present even before the system is locked. After GPZ
lock is the internal 10Mhz SMA connector output identical to 10MHz
Hello,
I am new to the group. Recently got a Z3815A (module type) and was looking
at ZL1BPU's User Guide. Don't ask me why but before I soldered a BNC coax
to the bottom antenna pads I checked them with an ohmmeter and found 2.5K
across the signal pad and ground. I was surprised since there
Which type of ohmmeter have you used? What voltage does it use to make the
measure? What polarity? If the voltage is greater than 700mV and the
positive was put on ground maybe some diode has turned on... anyway 2.5K on
5V is 2mA. I have never made such a test on a GPS receiver. I can try on a
Well, the TBolt measures 1086OHM on the antenna connector with a test
voltage of 3V (2K range on the multimeter) and open circuit when switching
to 20K range with 800mV test voltage, positive on antenna and negative on
GND. The Motorola M12 has 1940OHM (2K) and open on 20K. The uBlox LEA-5T is
I am new to the group. Recently got a Z3815A (module type) and was
looking at ZL1BPU's User Guide. Don't ask me why but before I
soldered a BNC coax to the bottom antenna pads I checked them with an
ohmmeter and found 2.5K across the signal pad and ground. I was
surprised since there will
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hi,
Thanks for the reply.
The mail I sent didnt come back on the mailing list,
and thought there was an error.
I'm sorry for the annoying repeating mails.
Have you just tried using a terminal program to
connect to the box to see if that also times
Hi
My Z3815A works fine (for weeks and weeks) with the Z8xx program.
Bob
On Feb 22, 2011, at 4:58 AM, Maxima Hirokazu wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hi,
Thanks for the reply.
The mail I sent didnt come back on the mailing list,
and thought there was an error.
Hi,
I got my hands on a Z3815A(with hockey puck)
and trying to communicate with it.
It seems that Z38XX and gpscon work ok at first,
then looses connection in about 30min.(error receiver timeout)
If I reestablish connection, it works fine, but in another
half an hour, it looses connection again.
Hi,
I got my hands on a Z3815A(with hockey puck)
and trying to communicate with it.
It seems that Z38XX and gpscon work ok at first,
then looses connection in about 30min.(error receiver timeout)
If I reestablish connection, it works fine, but in another
half an hour, it looses connection again.
Hi,
I got my hands on a Z3815A(with hockey puck)
and trying to communicate with it.
It seems that Z38XX and gpscon work ok at first,
then looses connection in about 30min.(error receiver timeout)
If I reestablish connection, it works fine, but in another
half an hour, it looses connection again.
Le 22/02/2011 05:13, Hirokazu Makishima a écrit :
Hi,
I got my hands on a Z3815A(with hockey puck)
and trying to communicate with it.
It seems that Z38XX and gpscon work ok at first,
then looses connection in about 30min.(error receiver timeout)
If I reestablish connection, it works fine, but
. The reverse engineered manual
from Murray was all I needed to get it going. It's been on pretty well
continuously for 3-4 years now and hasn't missed a beat
Morris
Date: Sat, 22 Jan 2011 21:39:57 -0500
From: Bob Camp li...@rtty.us
Subject: [time-nuts] Z3815A and Z38xx software
Hi
Is anybody
On 11 June 2010 07:24, Murray Greenman murray.green...@rakon.com wrote:
If you have one of the earlier Z3815A units, you will find the superb HP
E1938A 10MHz reference oscillator inside. There were manufacturing
problems with these units, I understand, and later ones (like mine) have
a
Hi
The 260's are better for environmental than a 10811, same / worse than a 1938.
The typical 260 beats the typical 10811 or 1938 on short term / medium term
stability. There are some 10811's and 1938's that will indeed beat some 260's
for short term stability.
Bob
On Jun 11, 2010, at
Thanks Bob.
On 12 June 2010 01:24, Bob Camp li...@rtty.us wrote:
Hi
The 260's are better for environmental than a 10811, same / worse than a
1938. The typical 260 beats the typical 10811 or 1938 on short term /
medium term stability. There are some 10811's and 1938's that will indeed
beat
I have not seen any plots on the 260 or E1938A on this site, I have only
been on for a year, how ever I have a few 10811s that Corby Dawson ran for
me all below 1 E-12 one as low as 4 E -13 in the 1 to 100 sec. range. My
problem is that Corby's file size is 900K and I have not found a way to
Hi
Your 10811's are likely a result of someone going through a *lot* of 10811's to
pick those out. I believe that the 260 part in the Z3815 is specified for a
maximum ADEV of 1x10^-12 at one second. They show a part like that on their
standard spec sheet. It's certainly quite possible to hit
Hi
The 260's are better for environmental than a 10811, same / worse than a
1938. The typical 260 beats the typical 10811 or 1938 on short term /
medium term stability. There are some 10811's and 1938's that will indeed
beat some 260's for short term stability.
Bob
: Friday, June 11, 2010 10:20 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3815A
I have not seen any plots on the 260 or E1938A on this site, I have only
been on for a year, how ever I have a few 10811s that Corby Dawson ran for
me all below 1 E-12 one as low as 4 E -13 in the 1 to 100 sec
Magnus,
The Agilent Z3815A is a very nice unit, and fairly easy to get going.
The main problem is software, which we had to specially write, although
some versions of Ulrich's Z38XX work with it quite well. (The problem is
subtle differences in the SCPI syntax).
Yes, the backplane carries all
Murray,
2010/1/19 Murray Greenman murray.green...@rakon.com:
There are at least 20 Z3815A units in ZL Amateur hands that I know of,
and many more in VK. They were 'rescued' by a friend in VK, and have
been distributed with firmware and manual that we've worked out for
them. As far as I can
Hi John,
2010/1/18 John Allen j...@pcsupportsolutions.com:
2.it come with the 16 channels GPS module (made by furuno in japan ) Hp
I've tried in vein to find information about the Furuno GPS, even
contacting the manufacturers directly :-(
But My Z3805A come with Two 10mhz and Two 1PPS Two
It actually has two RS232 connections, one tat seems to function
similar to the Z3801A/Z3816A and another which I have no clue as to
what it does?
Some GPS units have a second serial port. I think the idea was that you
could feed them data similar to what they now get from WAAS. There
Steve,
There are at least 20 Z3815A units in ZL Amateur hands that I know of,
and many more in VK. They were 'rescued' by a friend in VK, and have
been distributed with firmware and manual that we've worked out for
them. As far as I can make out, they were not used in cellular systems
here.
That makes a lot of sense for T1/E1 applications across a country. I know VK
had put in an early extensive glass phone network. Wonder if these were for
smaller offices?
On Mon, Jan 18, 2010 at 12:32 PM, Murray Greenman murray.green...@rakon.com
wrote:
Steve,
There are at least 20 Z3815A
paul swed wrote:
That makes a lot of sense for T1/E1 applications across a country. I know VK
had put in an early extensive glass phone network. Wonder if these were for
smaller offices?
Well, providing T1/E1 output with SSM codes makes sense for a number of
telecom equipments so it is a
Alberto,
The Z3815A is certainly less common - except down here in VK/ZL. I have
one, and can try to answer your questions. The oscillator used in the
Z3815A is generally the HP E1938A, although mine is a more recent
Symmetricom version with a Milliren 260 OCXO adaptation. Power supply is
20 -
I recently aquired one of these units Z3815a and am searching for any software
and/or manual that must be avaliable somewhere. Stu
_
Looking to change your car this year? Find car news, reviews and more
K1JOS
Message: 2
Date: Tue, 23 Oct 2007 20:30:34 +1000
From: Morris Odell [EMAIL PROTECTED]
Subject: [time-nuts] Z3815A connectors
To: time-nuts@febo.com
Message-ID: [EMAIL PROTECTED]
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Hi all,
Thanks
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
Hi all,
Thanks to a friend's investigative skills, I have found the maker of the
unusual coaxial connector block on the HP Z3815A GPSDO. See:
May 2007 04:27
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A - what? -who? -where?
I was thinking that myself, but this connector has four rows, and the
VME only has three. (There's also P1 and P2). VXI is similar to VME.
Having just worked
Correction - sold to Telecom Solutions before they became Symmetricom.
Rob
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rob Kimberley
Sent: 08 May 2007 08:58
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Z3815A
TFers,
Further to Kit's post a week or two back, we've started to make some
ground regarding understanding and using these excellent little GPSDO
units. I have working DOS software, and they also work OK with SATSTAT.
I have also sussed the GPS module comms and written a display
application for
Murray Greenman wrote:
TFers,
Further to Kit's post a week or two back, we've started to make some
ground regarding understanding and using these excellent little GPSDO
units. I have working DOS software, and they also work OK with SATSTAT.
I have also sussed the GPS module comms and written
I'm just silently following along. I have never heard of that model before
you guys mentioned it. I too would like to see pictures.
Jason
TFers,
Further to Kit's post a week or two back, we've started to make some
ground regarding understanding and using these excellent little GPSDO
units.
Gents,
I first noticed the Z3815A in January 2004 on eBay. I captured some pictures
then.
Moments ago I posted them here:
http://www.realhamradio.com/z3815/z3815.gif
http://www.realhamradio.com/z3815/z3815-front.gif
http://www.realhamradio.com/z3815/z3815-rear.gif
Bill, K8CU
Murray Greenman wrote:
TFers,
Further to Kit's post a week or two back, we've started to make some
ground regarding understanding and using these excellent little GPSDO
units. I have working DOS software, and they also work OK with SATSTAT.
I have also sussed the GPS module comms and written
] [mailto:[EMAIL PROTECTED] On
Behalf Of Bill Jones, K8CU
Sent: Monday, May 07, 2007 8:19 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3815A - what? -who? -where?
Gents,
I first noticed the Z3815A in January 2004 on eBay. I captured some
pictures then.
Moments ago
This connector looks like a VME backplane connector. They cost a fortune.
Didier KO4BB
Bill Hawkins wrote:
The pictures show why the 3815 never became popular.
Matching that monstrous connector would be a problem.
The project is impractical without the matching card
file.
And what is that
: [time-nuts] Z3815A - what? -who? -where?
This connector looks like a VME backplane connector. They cost a fortune.
Didier KO4BB
Bill Hawkins wrote:
The pictures show why the 3815 never became popular.
Matching that monstrous connector would be a problem.
The project is impractical without
I was thinking that myself, but this connector has four rows, and the
VME only has three. (There's also P1 and P2). VXI is similar to VME.
Having just worked on a project with VME cards, I know that those
connectors are quite expensive. These are similar but unique, so I
can't imagine
Gents,
I first noticed the Z3815A in January 2004 on eBay. I captured some pictures
then.
...
Bill, K8CU
Bill, That eBay unit was missing its E1938A OCXO; that's why it
looks odd. For photos of a Z3815A with its mounted oscillator see:
http://www.leapsecond.com/museum/z3815a/
For more
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