nd greater sensitivity for users seeking those features.
Art
-Original Message-
From: Gregory Beat [mailto:w...@icloud.com]
Sent: Wednesday, February 10, 2016 10:36 AM
To: Art Sepin
Cc: time-nuts@febo.com
Subject: Re: [time-nuts] Z3801 Update with VP-Oncore 8Ch receiver
Art -
Good to he
mailto:w...@icloud.com]
> Sent: Wednesday, February 10, 2016 10:36 AM
> To: Art Sepin
> Cc: time-nuts@febo.com
> Subject: Re: [time-nuts] Z3801 Update with VP-Oncore 8Ch receiver
>
> Art -
>
> Good to hear about a uBlox SSR-6 based board.
> A number of products (GPSDO,
Art -
Good to hear about a uBlox SSR-6 based board.
A number of products (GPSDO, time servers, etc.) used that Motorola board set.
I was following Dan Watson's work on building a substitute late last year ...
a modern Oncore VP replacement / interpreter using the new u-blox chipsets.
http://sy
Bray
Sent: Sunday, February 07, 2016 7:34 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Z3801 Update with VP-Oncore 8Ch receiver
This brings up a question that I have been wondering about. Has anyone tried
using one of the Synergy M12/adaptor board assemblies as an update in the Z3801
or si
TAPR sold a number of Motorola Oncore VP 8-channel GPS receivers with the TAC-2
kit in late 1990s. As I remember, the VP model will successfully emulate the
earlier 6-channel model in equipment expecting the earlier model.
It works fine in the Z3801A. There were likely Firmware versions with Z3
So far it seems one can 'drop in' a 8 channel module and it will as a
minimum
been seen as a 6 channel.
Once I can come up with a reliable and safe way to ship, antistatic and
minimal
crushability, and a less time consuming way of getting the module out of
the old surveying hand held I'll make som
Hi
Part of the way through the development of the modules, they started adding
various commands. Eventually
that changed the way things worked enough that it no longer is a “little bit
longer string” sort of thing.
Bob
> On Feb 7, 2016, at 10:33 PM, Frederick Bray wrote:
>
> This brings up
I doubt that will work without going through another uc to do translation. I
have tried using UT+ receivers in my Z3801A and they don't work even though
they are plug compatible. If someone has a recording of the data sreams from a
standard Z3801A then it could be done. Would it be worth the eff
This brings up a question that I have been wondering about. Has anyone
tried using one of the Synergy M12/adaptor board assemblies as an update
in the Z3801 or similar unit? If the original firmware just ignores the
extra data, perhaps the Synergy unit might work? They are quite
inexpensive o
Hi
On most of these 6 to 8 or 12 conversions, the original firmware (if it works)
simply ignores the status
line after the first 6 data fields. The only way to get the added data is to
hack in and capture the stream
out of the GPS module yourself. That can be done on some of the KS boxes, but
As noted in the earlier post my earlier I had a Z3801A in which the
receiver would err out after as little as 20 min. this was 6CH Motorola
Oncore which had I guess reached end of life after 20 years and 15,000
hours. A friend offered me a used 8CH Motorola VP-Oncore on the
condition I report o
Charles,
The OCXO has always been pretty warm to the touch. Except now, it is
barely warm. I tried the antenna first with a card sized Symmetricon GPSDO
and it locked up OK. I have a small uBlox GPS that gives the signal levels
of the satellites it sees. I need to hook that up and check. The Ante
John wrote:
I am now thinking it may be an OCXO outer oven failure. It normally
runs quite warm. But now, it seems it may be body temperature or maybe a
little less. The 10811 is different to a stock one but, is the outer oven
voltage the same? I would think the inner oven should keep it warm e
Hi
The only real function of the outer oven on the Z3801 is to improve the
pereormcane when it fires up cold at -40C. As long as you are at a rational
temperature, it really does nothing useful stability wise.
Of course if it pitches an alarm “outer oven dead” that can be a bit of an
issue.
Pete, I am now thinking it may be an OCXO outer oven failure. It normally
runs quite warm. But now, it seems it may be body temperature or maybe a
little less. The 10811 is different to a stock one but, is the outer oven
voltage the same? I would think the inner oven should keep it warm enough
to
I have a long shot.
If you really do not think it is not anything to do with not getting a
signal into the 3801, antenna, cable, connectors etc. I may have a
replacement GPS module but will have to be confirmed by the group.
The module is a 8 Channel Motorola Oncore
http://petelancashire.com/gal
John
What software are you running? Are you are getting the receiver health
status at the bottom of the status page?
Crank it back up and once the thing goes into HOLD check and tell me if
the RCVR status says "err"
Dave
On 2/1/2016 9:52 AM, John Green wrote:
After a couple of days of G
As much as I like my 3801 most likely will use my bolt
I also have ks24361s so between them have a good idea
The is are reasonable at times
On Monday, February 1, 2016, John Green wrote:
> After a couple of days of GPS lock, it went into holdover. I briefly
> powered it down and it attained lock
After a couple of days of GPS lock, it went into holdover. I briefly
powered it down and it attained lock again in about 15 minutes. But, a
while later, it was back in holdover. I finally coaxed that Sager laptop
into working and after connecting to it with genuine RS232, I still can't
communicate
I added 2 X AA batteries external to the 3801 to the GPS receiver. Will run
several years and very easy to replace. Now that doesn't make it instant
start but certainly sub hour or less maybe 20 minutes.
Good luck.
Paul
WB8TSL
On Fri, Jan 29, 2016 at 8:43 AM, John Green wrote:
> Charles,
> The p
Dave:
Your antenna setup sounds reasonable.
You might want to try dropping your elevation mask down to 5 or 10 degrees,
as an experiment.
Things that cause the sporadic jumps could be certain satellites being
added to, or removed from the solution.
Also, if there are particular angles/directions
Graham
Symmetricom 58532A antenna, just above the roof, with 8 feet of RG213.
Flat ( Florida) rural location with 360 degree view other than some trees. The
GPS Antenna plot from Z38xx has filled in pretty much 360 degrees down to 20
degrees solid and in most directions to down to 15 degrees el
Charles,
The place isn't out of the way. In fact, it wouldn't surprise me if it got
a power interruption sometime. In addition, the temperature isn't stable
either. It will be at least a couple of weeks before I am ready to attempt
to use it for anything, and then it won't matter so much about abs
John wrote:
Tonight I got a GPS Lock light. Bravo!
Patience is a virtue. ;-)
Remember this when it comes to all the other metrics -- settling to
good stability, in particular, which may take quite a while (weeks to
months) since the OCXO has been off for so long. My suggestion is to
put
Please describe your Antenna setup and location.
How much of the sky can it see, in which directions.
Which directions are blocked for direct line of sight, and must depend on
reflections from nearby buildings or objects?
--- Graham
==
On Thu, Jan 28, 2016 at 11:25 AM, Tom Van Baak wrote:
> Da
Tonight I got a GPS Lock light. Bravo!
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Dave,
Plot the #SV tracked and signal strength(s) over a couple of days. See if your
once or twice a day glitches correlate to periods of low reception.
To see what the reception of other z3801a owners look like:
http://www.realhamradio.com/GPS_websites_list.htm
You may even want to try a lowe
OK
My Z3801A came out of mothballs after 15 years in controlled storage and
appears to be behaving. now I am curious as to what I am seeing
First I am not truly a "time" nut ( I am semi retired and have not worn
a watch since October 12th 2008 :-) ). I am probably more of "frequency"
nut . I
manu...@artekmanuals.com said:
> Hal makes a good point the Z3801 RS232 port is not exactly standard make
> sure the COM port settings in Z38xx and in the set up on the computer
> (CONTROL PANEL) are set to 19200baud, 7, 1, ODD. BOTH have to be set up as
> these are not computer industry "standar
Thanks guys. I'll hook it up to the regular power supply and let it cook
for a while. I have a uBlox board I want to check for jitter, but I'll need
that '3801 to check it against. The fun part will just have to wait.
___
time-nuts mailing list -- time-nu
Good comment on leaving it on for a long time if the almanac has been lost.
You see nothing accept the green pwr led and I have seen 48 hours to lock.
I added a batter 2 X AA and that keeps the almanac and enhances startup.
But nothing like a modern 30 sec or less receiver.
WB8TSL
On Tue, Jan 26,
John wrote:
I even left it on over night.
It may need longer than overnight to assemble an almanac and
initialize everything. Leave it on for a week before you panic.
Best regards,
Charles
___
time-nuts mailing list -- time-nuts@febo.com
To un
there are two versions a 24V version and a 48V version ... If you look
at the back of the Z3801 there will be a "dot" on which voltage your
unit is powered for . ...The 48V version is the more common. Since your
unit is going through the full LED cycle on 27V supply I suspect that
you do have
On 1/26/2016 12:54 AM, Hal Murray wrote:
I'm thinking of trying a new GPS board next.
A bad GPS board won't prevent communication to the main CPU.
You might try capturing the output when you power it on. It sends out
something. I forget what, probably the ID string.. If that doesn't work,
tr
John
The 3801s are getting very old at this point. I know mine has started to
show a loss of lock occasionally on the oscillator. Intermittent problems
are very tough.
What jumps out to me is the 27 volts. That seems low as I recall. I run at
48 V. I understand there were several models made so wha
John
I am no expert but I have been playing ( A lot) with my Z3801 during the
last month, after having it in storage for 15 years !
What software program are you running, under what operating system?
Can you see the satellites being tracked in the receiver status window
in SATSTAT? on the comp
> I'm thinking of trying a new GPS board next.
A bad GPS board won't prevent communication to the main CPU.
You might try capturing the output when you power it on. It sends out
something. I forget what, probably the ID string.. If that doesn't work,
try a scope. You might have the PC runni
After running continuously for about 3 years at work, I stored my Z3801 for
a little over a year. I recently took it out of storage and when I hooked
it up, all I get is a power on light. The front panel LEDs light in
sequence and the 6 inside blink red once and then the last one blinks
continuousl
Jarl
Responded back and you have to open the outer oven.
I know thats nasty, but there is an adjustment.
Not looking forward to that effort.
Regards
Paul
WB8TSL
On Sat, Nov 15, 2014 at 5:34 PM, Arthur Dent
wrote:
> "I also seem to recall pix of the Z3801 oscillator and there were not any
> adjus
"I also seem to recall pix of the Z3801 oscillator and there were not any
adjustments. I sure hope I missed something."
Thanks
Paul
WB8TSL
+
There is an adjustment on the inner 10811 oscillator but it isn't easy to
get to. Here is a description.
http://www.2917.com/EBAY-images/10811-601
OK since I have the z3811 EFC around mid band at 5, now the question
comes up on the Z3801 is at 81,000 for the EFC. Its quite stable. But I
seem to recall on Time-nuts a while ago that when the EFC gets to 100,000
or 0 it stops working?
On a traditional oscillator I know that you could adjust
All:
I purchased and am about to hook up the Nortel device.
Someone on this list expressed an interest in my old Z3801, but I lost
the email. If still interested, please contact me off list.
Thanks & 73,
Jim
wb4...@amsat.org
On 6/28/2013 9:45 AM, Jim Sanford wrote:
All:
My Z3801 no longe
To answer the question of whether the Nortel/Trimble
units will work with Lady Heather, here is a photo of
my modified NTPB15AA with the T-bolt monitor built-in.
This version I bought from RDR-electronics works fine.
http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg
-Arthur
___
(I missent this message the first time but better late than never I suppose)
Besides having a broken Subject: line my previous message might have
implied that RDR doesn't have Trimble units. Of course they do (at
least sometimes). They have both Trimble and Symmetricom versions of
the "Nortel" N
Hi
On Jun 28, 2013, at 9:45 AM, Jim Sanford wrote:
> All:
>
> My Z3801 no longer works, and I've not been able to get any new ideas on it,
> so am looking for a replacement.
>
> I've come across a nice 10 MHz that has very good phase noise (-145db or so
> at 10 KHz offset), but costs $175 i
Tbolts been good for my uses. Nice and simple no muss or fuss.
I think I paid $139.
Regards
Paul.
On Fri, Jun 28, 2013 at 11:45 AM, Bob Camp wrote:
> Hi
>
> Ok, so the 100 MHz cleanup oscillator hopefully will be about -130 dbc /
> Hz or better at 100 Hz offset. That would mean a -150 dbc / Hz
Hi
Ok, so the 100 MHz cleanup oscillator hopefully will be about -130 dbc / Hz or
better at 100 Hz offset. That would mean a -150 dbc / Hz OCXO is roughly a
tradeoff at 100 Hz. At 1KHz your cleanup oscillator should be around -150 to
-160. That would put the 10 MHz at -170 to -180 to be in the
How about using the 10811 from your broken Z3801A?
Adrian
Jim Sanford schrieb:
Bob:
Thanks.
You correctly anticipated that I will use this to lock a 100 MHz
Oscillator, and either multiply or lock from there. (I'm considering
a VCXO at 1GHz as well, it would either be locked to 100 MHz or 10
Bob:
Thanks.
You correctly anticipated that I will use this to lock a 100 MHz
Oscillator, and either multiply or lock from there. (I'm considering a
VCXO at 1GHz as well, it would either be locked to 100 MHz or 10 Mhz.
Haven't decided yet, also considering multiplying up to 1000 and then
fro
Hi
On Jun 28, 2013, at 9:45 AM, Jim Sanford wrote:
> All:
>
> My Z3801 no longer works, and I've not been able to get any new ideas on it,
> so am looking for a replacement.
>
> I've come across a nice 10 MHz that has very good phase noise (-145db or so
> at 10 KHz offset), but costs $175 i
All:
My Z3801 no longer works, and I've not been able to get any new ideas on
it, so am looking for a replacement.
I've come across a nice 10 MHz that has very good phase noise (-145db or
so at 10 KHz offset), but costs $175 in single quantities (digi-key, I
think.) I was considering using
All:
Seeking help with my Z3801. I was referred here by some folks on the
Microwave reflector.
Background: It ran very well for several years. Then, when
spot-checked on another counter, was found a few Hz away from
10.0MHz. Looking at GPSCon, it showed the output to not be enabled,
a
>>> The GPS receiver in my Z3801 has died and I need to replace it.
>> Go to ebay and type "oncore" in the search box. There are MANY available
>> starting at just about $20.
>Search for "oncore vp" (which is what a z3801a needs), and you won't
>find ANY, at any price.
On Ebay rdr-electronics
Dan Kemppainen wrote:
On 9/17/2012 6:03 PM, time-nuts-requ...@febo.com wrote:
OK, you can test a VP Oncore GPS receiver alone if you have a mean to
translate the TTL serial port to a regular RS232 for the PC. This
can be done with a MAX232 chip (or equivalent). Then the pinout
(refer to the
FY
ailto:time-nuts-boun...@febo.com] On
Behalf Of Don Latham
Sent: Tuesday, September 18, 2012 11:35 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801 Replacement GPS Receiver Card
TTL to USB serial adapters on ebay for very reasonable.
Don
Dan Kemppainen
>
&
TTL to USB serial adapters on ebay for very reasonable.
Don
Dan Kemppainen
>
> On 9/17/2012 6:03 PM, time-nuts-requ...@febo.com wrote:
>> OK, you can test a VP Oncore GPS receiver alone if you have a mean to
>> translate the TTL serial port to a regular RS232 for the PC. This can
>> be
>> done wit
On 9/17/2012 6:03 PM, time-nuts-requ...@febo.com wrote:
OK, you can test a VP Oncore GPS receiver alone if you have a mean to
translate the TTL serial port to a regular RS232 for the PC. This can be
done with a MAX232 chip (or equivalent). Then the pinout (refer to the
FYI, I've had really goo
Art Sepin
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Azelio Boriani
Sent: Monday, September 17, 2012 3:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801 Replacement GPS Receiver Card
On 9/17/12 3:34 PM, Chris Albertson wrote:
$20 is to much. I pay about $4 shipping included for the DB9 with the
Max chip attached. So you basically just attach 5V TTL to the back
of the connector.
That works. if you have 5V handy.. The USB to ttl serial is handy when
you don't necessarily
Or use transistors. You can translate the serial levels this way too, look
at this as an example: http://www.kmitl.ac.th/~kswichit/ap275/ap275.htm
On Tue, Sep 18, 2012 at 12:36 AM, Azelio Boriani
wrote:
> Yes, and you can even try an USB to serial adapter but with the TTL
> output. You can try wi
Yes, and you can even try an USB to serial adapter but with the TTL output.
You can try with a simple inverter (74HC04, 74HC14 but use a resistor in
series between the PC output and the inverter input) as some PC accept the
0-5V levels.
On Tue, Sep 18, 2012 at 12:22 AM, Jim Lux wrote:
> On 9/17/
$20 is to much. I pay about $4 shipping included for the DB9 with the
Max chip attached. So you basically just attach 5V TTL to the back
of the connector. Lots of people sell these. See ebay #180688345029
for an example. These work well for the Oncore GPS because both use
0.1 inch male heade
On 9/17/12 3:00 PM, Azelio Boriani wrote:
OK, you can test a VP Oncore GPS receiver alone if you have a mean to
translate the TTL serial port to a regular RS232 for the PC. This can be
done with a MAX232 chip (or equivalent).
There are a ton of these (serial TTL ports) available inexpensively f
essage.
> The full VP Oncore Command/Reply message set is available here:
>
> http://www.synergy-gps.com/images/stories/guides/vpcommands.pdf
>
> Art Sepin
>
>
>
>
> From: time-nuts-boun...@febo.com on behalf of Hui Zhang
> Sent: Sun 9/16
ge set is available here:
http://www.synergy-gps.com/images/stories/guides/vpcommands.pdf
Art Sepin
From: time-nuts-boun...@febo.com on behalf of Hui Zhang
Sent: Sun 9/16/2012 6:38 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [
On Sat, Sep 15, 2012 at 7:04 PM, paul swed wrote:
> As Bob mentions there may be more to it then just nailing that particular
> command.
> But worth taking a look after I deal with the wwvb psk issue. As far as the
> 5 to 3 V I would just use a 3 term reg like the cherry semi chip. But there
> are
Le 16/09/2012 15:38, Hui Zhang a écrit :
I just bought a second-hand Z3801A, it also had a error message when self test
- GPS Rcv error, and I saw a red LED on main board on. I want test it alone but
I don't know GPS board's pin define, can someone tell me? Thanks.
--
Les chiens aboient, et
HI
This is a pretty good start:
http://www.febo.com/pages/hardware/VPCommands.pdf
http://gpsd.berlios.de/vendor-docs/motorola/toc.pdf
There are lots of other references out there.
Bob
On Sep 16, 2012, at 9:38 AM, "Hui Zhang" wrote:
> I just bought a second-hand Z3801A, it also had a error m
Hi
It's probably easier to just make up an emulator for the UT rather than doing
it on a string by string basis. Only one of the strings needs to synch up with
the PPS. The rest can all be generated as needed. I'm not saying it would be
easy, only easier.
Maybe put something like an LEA-6T an
I just bought a second-hand Z3801A, it also had a error message when self test
- GPS Rcv error, and I saw a red LED on main board on. I want test it alone but
I don't know GPS board's pin define, can someone tell me? Thanks.
Hui
At 2012-09-16 21:20:26,"Azelio Boriani" wrote:
>Anyway, are you
Anyway, are you sure that the GPS unit is faulty? Can you test it alone?
The unit is responsive on the serial port? Is the Z3801A sending commands?
Can you verify with a 'scope on the serial line if there is any signal?
On Sun, Sep 16, 2012 at 2:54 PM, Mike S wrote:
> On 9/15/2012 2:11 PM, paul
On 9/15/2012 2:11 PM, paul swed wrote:
Then respond back with whatever the response might be and then simply pass
through in both direction whatever comes next.
Could an updated rcvr be used.
Is this init command really the only gotcha?
It's more than just the init command. The z3801a also send
> The could be a pretty huge upgrade. Enough maybe to just replacing working
> GPS cards. The newer Oncores have 10X or more better performance. You uP
> would have to introduce a small delay but not much if it is just passthrough
> data. ...
Has anybody looked at the software inside the Z380
As Bob mentions there may be more to it then just nailing that particular
command.
But worth taking a look after I deal with the wwvb psk issue. As far as the
5 to 3 V I would just use a 3 term reg like the cherry semi chip. But there
are plenty of alternates. It will take 5 in and give 3.3 out at
On Sat, Sep 15, 2012 at 11:11 AM, paul swed wrote:
> I also have a z3801 so perhaps I will face the same issue at some point.
> The question I have is the following.
> If a uproc is inserted between the rcvr and the chassis to intercept the
> init command.
> Then respond back with whatever the res
Hi
The only way to find out is to actually do it. Right now the init string keeps
you from "seeing" any further into the process.
Bob
On Sep 15, 2012, at 2:11 PM, paul swed wrote:
> I also have a z3801 so perhaps I will face the same issue at some point.
> The question I have is the following
I also have a z3801 so perhaps I will face the same issue at some point.
The question I have is the following.
If a uproc is inserted between the rcvr and the chassis to intercept the
init command.
Then respond back with whatever the response might be and then simply pass
through in both direction
Are you sure that the GPS unit is defective? Can you test it alone?
On Thu, Sep 13, 2012 at 10:44 PM, Mike S wrote:
> On 9/13/2012 2:00 PM, Chris Albertson wrote:
>
>> On Thu, Sep 13, 2012 at 10:53 AM, Mike S wrote:
>>
>>> Search for "oncore vp" (which is what a z3801a needs), and you won't fin
On 9/13/2012 2:00 PM, Chris Albertson wrote:
On Thu, Sep 13, 2012 at 10:53 AM, Mike S wrote:
Search for "oncore vp" (which is what a z3801a needs), and you won't find
ANY, at any price.
Really? It can't use the newer UT? I thought the UT is identical except
for better performance.
Yes, re
I found an online comment some while ago that suggested non of the later
receivers would work, again it's something I haven't tried but I suspect the
message formats are incompatible.
Following my earlier post it would seem that an 8 channel VP should indeed
be ok if configured to be in 6 c
On Thu, Sep 13, 2012 at 10:53 AM, Mike S wrote:
> On 9/13/2012 1:39 PM, Chris Albertson wrote:
>
>> On Thu, Sep 13, 2012 at 10:22 AM, wrote:
>>
>>>
>>> The GPS receiver in my Z3801 has died and I need to replace it.
>>>
>> Go to ebay and type "oncore" in the search box. There are MANY availabl
On 9/13/2012 1:39 PM, Chris Albertson wrote:
On Thu, Sep 13, 2012 at 10:22 AM, wrote:
The GPS receiver in my Z3801 has died and I need to replace it.
Go to ebay and type "oncore" in the search box. There are MANY available
starting at just about $20.
Search for "oncore vp" (which is what
On Thu, Sep 13, 2012 at 10:22 AM, wrote:
>
> The GPS receiver in my Z3801 has died and I need to replace it.
>
> I know the one inside the Z3801 is a 6 channel Oncore. But these are hard
> to locate.
>
>
Go to ebay and type "oncore" in the search box. There are MANY available
starting at just
Hi Doug
I have seen comments that the later 8 channel Oncore should work ok, some
of those you'll probably find in the list archives.
I've also seen it claimed that the 8 channel Oncore needs to be configured
in 6 channel compatibility mode in order to work in the Z3801A but other
comment
Hi,
The GPS receiver in my Z3801 has died and I need to replace it.
I know the one inside the Z3801 is a 6 channel Oncore. But these are hard to
locate.
Could anyone recomend a source of suitable replacement cards. be it 6 or 12
channel, the main thing is it works
thanks
Doug
G4DZU
__
Nov 2011 09:37:07
To:
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801 EFC error
If any one needs an original 10811 manual I have a few. Please contact me
off list.
Bert
In a message dated 11/1/2011 9:21:43 A.M. Eastern Daylight Time
I suspect the
outer oven is probably not needed.
Good luck.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert Benward
Sent: Tuesday, November 01, 2011 8:00 AM
To: Discussion of precise time and frequency measurement
Sub
ay, November 01, 2011 8:00 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Z3801 EFC error
Joe,
Good guess. It's a 10811 with an additional oven wrapped around it for
better thermal control. I'll check it in a couple days when I get home. Is
this t
. Trantham"
To: "'Discussion of precise time and frequency measurement'"
Sent: Tuesday, November 01, 2011 12:21 AM
Subject: Re: [time-nuts] Z3801 EFC error
I think it uses a 10811 OCXO. See if it is warm. If not, perhaps the
'thermal fuse'?
Joe
-Orig
I think it uses a 10811 OCXO. See if it is warm. If not, perhaps the
'thermal fuse'?
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob
Sent: Monday, October 31, 2011 11:17 PM
To: time-nuts@febo.com
Subject: [time-n
Hi,
My Z3801 just crapped out. It seems that the DAC has ramped up to the rails,
1048560, and I'm getting an EFC fault. Any tips before I open the unit and
start poking around? The oscillator is running and pretty close to 10MHz, I
don't have any reference accurate enough to check it. Any tr
> So I can only deduce from this that the TNC male (cable end) to TNC female
> (mushroom antenna) is intermittent. Don't understand why but it now looks
> like it is receiving 6 satellites and the 3801 is in "recovery" mode.
I wouldn't be quite so sure
My Z3801 stopped working right a w
On 15/07/11 15:06, Ron Hahn (EI2JP) wrote:
On 7/11/2011 3:57 PM, Charles P. Steinmetz wrote:
Ron wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks.
The problem is that it seems to oscillate between "gps-lock" and
"holdover". When I checked further it seems
On 7/11/2011 3:57 PM, Charles P. Steinmetz wrote:
Ron wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks.
The problem is that it seems to oscillate between "gps-lock" and
"holdover". When I checked further it seems to be oscillating
between, locked, recove
Dear Ron,
On 07/11/2011 12:22 PM, Ron Hahn (EI2JP) wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks. Its
been running for several years now (at three different QTHs) and has
worked flawlessly until recently.
The problem is that it seems to oscillate between
Ron wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks.
The problem is that it seems to oscillate between "gps-lock" and
"holdover". When I checked further it seems to be oscillating
between, locked, recovery, and holdover, mostly staying in recovery
and h
On 7/11/2011 2:54 PM, Jason Rabel wrote:
Ron,
My guess would be one of two things...
First check the EFC on the OXCO, if it's near the edge of the tuning range you
might need to adjust the Coarse Adjustment screw to
get it back to near-center of the EFC range.
Interestingly, the 14:21:14 repor
Ron,
My guess would be one of two things...
First check the EFC on the OXCO, if it's near the edge of the tuning range you
might need to adjust the Coarse Adjustment screw to
get it back to near-center of the EFC range.
Second, as Bob said, it could be the GPS receiver (I believe these had Onco
Hi
I also have a "sick" Z3801. In my case I'm betting it's the Oncore receiver in
it. The symptoms aren't quite the same as yours, but similar.
Bob
On Jul 11, 2011, at 6:22 AM, Ron Hahn (EI2JP) wrote:
> Colleagues,
>
> My Z3801 has developed a peculiar problem over the last few weeks. Its b
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks. Its
been running for several years now (at three different QTHs) and has
worked flawlessly until recently.
The problem is that it seems to oscillate between "gps-lock" and
"holdover". When I checked further it s
1 - 100 of 132 matches
Mail list logo
