Regarding RAPCO 2804 (Pendulum 2804)...
A big thank you for providing the manual !
I began troubleshooting a few days ago. The OCXO is OK.The GPS module (Trimble 52830) seems to have low sensitivity asit can detect only a one or two satellites. I tried replacing it with a uBlox unitwith an identical footprint but the communication parametersdoes not match which stopped any further attempts so I put
the clock aside but with the manual, I can now proceed.
The indicated fault was "Erroneous lock +/- 5Hz".
-5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846
V e r y expenceive from distributors but several are availableon eBay at acceptable prices. I have to rule out the GPS modulebefore any further decisions.
Once again: Thanks!
Best Regards
Ulf Kylenfall
Ulf
A consideration. When a ublox starts up the communications parameters
contain the Ublox messages not just NEMA.
Also the baud rate and parity and bit length may be wrong. You should be
able to sniff the old low sensitivity receiver to see what messages its
putting out and the other parameters and then try matching.
Good luck looks like a neat restoration.
Regards
Paul
WB8TSL
On Fri, Jun 2, 2023 at 4:17 PM Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:
A big thank you for providing the manual !
I began troubleshooting a few days ago. The OCXO is OK.The GPS module
(Trimble 52830) seems to have low sensitivity asit can detect only a one or
two satellites. I tried replacing it with a uBlox unitwith an identical
footprint but the communication parametersdoes not match which stopped any
further attempts so I put
the clock aside but with the manual, I can now proceed.
The indicated fault was "Erroneous lock +/- 5Hz".
-5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846
V e r y expenceive from distributors but several are availableon eBay at
acceptable prices. I have to rule out the GPS modulebefore any further
decisions.
Once again: Thanks!
Best Regards
Ulf Kylenfall
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
There's an application note on the ublox website for the u-centre software that iirc explains the serial port messages.Sent from my Galaxy
-------- Original message --------From: paul swed via time-nuts time-nuts@lists.febo.com Date: 02/06/2023 23:23 (GMT+00:00) To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com Cc: Ulf Kylenfall ulf_r_k@yahoo.com, paul swed paulswedb@gmail.com Subject: [time-nuts] Re: Regarding RAPCO 2804 (Pendulum 2804)... UlfA consideration. When a ublox starts up the communications parameterscontain the Ublox messages not just NEMA.Also the baud rate and parity and bit length may be wrong. You should beable to sniff the old low sensitivity receiver to see what messages itsputting out and the other parameters and then try matching.Good luck looks like a neat restoration.RegardsPaulWB8TSLOn Fri, Jun 2, 2023 at 4:17 PM Ulf Kylenfall via time-nuts time-nuts@lists.febo.com wrote:>> A big thank you for providing the manual !> I began troubleshooting a few days ago. The OCXO is OK.The GPS module> (Trimble 52830) seems to have low sensitivity asit can detect only a one or> two satellites. I tried replacing it with a uBlox unitwith an identical> footprint but the communication parametersdoes not match which stopped any> further attempts so I put> the clock aside but with the manual, I can now proceed.> The indicated fault was "Erroneous lock +/- 5Hz".>> -5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846>> V e r y expenceive from distributors but several are availableon eBay at> acceptable prices. I have to rule out the GPS modulebefore any further> decisions.> Once again: Thanks!> Best Regards> Ulf Kylenfall>>> _______________________________________________> time-nuts mailing list -- time-nuts@lists.febo.com> To unsubscribe send an email to time-nuts-leave@lists.febo.com_______________________________________________time-nuts mailing list -- time-nuts@lists.febo.comTo unsubscribe send an email to time-nuts-leave@lists.febo.com
I would assume it is TSIP and not NMEA involved here.
Ulf, I have one and probably another working unit. Would you have use for a working unit to compare with? Rapco branded. You based at the salty front side of Svedala?
/Björn
Sent from my Phone
On 3 Jun 2023, at 00:22, paul swed via time-nuts time-nuts@lists.febo.com wrote:
Ulf
A consideration. When a ublox starts up the communications parameters
contain the Ublox messages not just NEMA.
Also the baud rate and parity and bit length may be wrong. You should be
able to sniff the old low sensitivity receiver to see what messages its
putting out and the other parameters and then try matching.
Good luck looks like a neat restoration.
Regards
Paul
WB8TSL
On Fri, Jun 2, 2023 at 4:17 PM Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:A big thank you for providing the manual !
I began troubleshooting a few days ago. The OCXO is OK.The GPS module
(Trimble 52830) seems to have low sensitivity asit can detect only a one or
two satellites. I tried replacing it with a uBlox unitwith an identical
footprint but the communication parametersdoes not match which stopped any
further attempts so I put
the clock aside but with the manual, I can now proceed.
The indicated fault was "Erroneous lock +/- 5Hz".-5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846
V e r y expenceive from distributors but several are availableon eBay at
acceptable prices. I have to rule out the GPS modulebefore any further
decisions.
Once again: Thanks!
Best Regards
Ulf Kylenfall
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Sorry my units are Rapco 1804M. Don’t know how similar that is to 2804.
Sent from my Phone
On 3 Jun 2023, at 12:18, Björn bg@lysator.liu.se wrote:
I would assume it is TSIP and not NMEA involved here.
Ulf, I have one and probably another working unit. Would you have use for a working unit to compare with? Rapco branded. You based at the salty front side of Svedala?
/Björn
Sent from my Phone
On 3 Jun 2023, at 00:22, paul swed via time-nuts time-nuts@lists.febo.com wrote:
Ulf
A consideration. When a ublox starts up the communications parameters
contain the Ublox messages not just NEMA.
Also the baud rate and parity and bit length may be wrong. You should be
able to sniff the old low sensitivity receiver to see what messages its
putting out and the other parameters and then try matching.
Good luck looks like a neat restoration.
Regards
Paul
WB8TSLOn Fri, Jun 2, 2023 at 4:17 PM Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:A big thank you for providing the manual !
I began troubleshooting a few days ago. The OCXO is OK.The GPS module
(Trimble 52830) seems to have low sensitivity asit can detect only a one or
two satellites. I tried replacing it with a uBlox unitwith an identical
footprint but the communication parametersdoes not match which stopped any
further attempts so I put
the clock aside but with the manual, I can now proceed.
The indicated fault was "Erroneous lock +/- 5Hz".-5 Hz is when the DAC is at 0.2V output. It is a paralell loaded AD7846
V e r y expenceive from distributors but several are availableon eBay at
acceptable prices. I have to rule out the GPS modulebefore any further
decisions.
Once again: Thanks!
Best Regards
Ulf Kylenfall
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com