Z3801A Freq jumping
Hello all - Not sure what's happening to my Z3801A. Doesn't unlock, but EFC jumping all over.
Is my oven controller dieing? I did a reacquire satellites abt 10 days ago - no difference.
See plot below of the last ~36 days. Any thing to try - restart from cold, etc ???
George
George,
Looking at your graph, as far as I can see, the EFC jumps appear to be tied to the TI
From the graph, your hitting +/- ~750ns. Normally, one sees +/- ~50ns. nax
(although one particular basket case I have goes up into the milliseconds occasionally,
It is a defective GPS module, I have proved this by swapping the module with another unit and the fault follows the GPS module.)
I am not sure of the mechanics of how the EFC follows TI, perhaps one of the other members can chime in?
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of George Sintchak
Sent: Tuesday, 23 July 2013 1:30 AM
To: time-nuts@febo.com
Subject: [time-nuts] Z3801A Freq jumping
Hello all - Not sure what's happening to my Z3801A. Doesn't unlock, but EFC jumping all over.
Is my oven controller dieing? I did a reacquire satellites abt 10 days ago - no difference.
See plot below of the last ~36 days. Any thing to try - restart from cold, etc ???
George
OK Marki, I have a Z3816 with a possible bad 5 MHz oscillator. Maybe I can
swap out the GPS rcvr. I have to see if they are compatible. Does anyone out
there know?
Tnx,
George
----- Original Message -----
From: "Mark C. Stephens" marks@non-stop.com.au
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, July 22, 2013 12:32 PM
Subject: RE: [time-nuts] Z3801A Freq jumping
George,
Looking at your graph, as far as I can see, the EFC jumps appear to be
tied to the TI
From the graph, your hitting +/- ~750ns. Normally, one sees +/- ~50ns. nax
(although one particular basket case I have goes up into the milliseconds
occasionally,
It is a defective GPS module, I have proved this by swapping the module
with another unit and the fault follows the GPS module.)
I am not sure of the mechanics of how the EFC follows TI, perhaps one of
the other members can chime in?
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of George Sintchak
Sent: Tuesday, 23 July 2013 1:30 AM
To: time-nuts@febo.com
Subject: [time-nuts] Z3801A Freq jumping
Hello all - Not sure what's happening to my Z3801A. Doesn't unlock, but
EFC jumping all over.
Is my oven controller dieing? I did a reacquire satellites abt 10 days
ago - no difference.
See plot below of the last ~36 days. Any thing to try - restart from cold,
etc ???
George
George,
The Z3816A is 8 channel, the Z3801A is 6 channel.
What is the problem with the Z3816A?
EFC error?
-marki
-----Original Message-----
From: George Sintchak [mailto:wa2vnv@optonline.net]
Sent: Tuesday, 23 July 2013 12:34 PM
To: Mark C. Stephens; time-nuts@febo.com
Subject: Re: [time-nuts] Z3801A Freq jumping
OK Marki, I have a Z3816 with a possible bad 5 MHz oscillator. Maybe I can swap out the GPS rcvr. I have to see if they are compatible. Does anyone out there know?
Tnx,
George
----- Original Message -----
From: "Mark C. Stephens" marks@non-stop.com.au
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Monday, July 22, 2013 12:32 PM
Subject: RE: [time-nuts] Z3801A Freq jumping
George,
Looking at your graph, as far as I can see, the EFC jumps appear to be
tied to the TI
From the graph, your hitting +/- ~750ns. Normally, one sees +/- ~50ns. nax
(although one particular basket case I have goes up into the milliseconds
occasionally,
It is a defective GPS module, I have proved this by swapping the module
with another unit and the fault follows the GPS module.)
I am not sure of the mechanics of how the EFC follows TI, perhaps one of
the other members can chime in?
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of George Sintchak
Sent: Tuesday, 23 July 2013 1:30 AM
To: time-nuts@febo.com
Subject: [time-nuts] Z3801A Freq jumping
Hello all - Not sure what's happening to my Z3801A. Doesn't unlock, but
EFC jumping all over.
Is my oven controller dieing? I did a reacquire satellites abt 10 days
ago - no difference.
See plot below of the last ~36 days. Any thing to try - restart from cold,
etc ???
George