[time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK
If the XO is failing due to GPS or Antenna problem, then why does the NO GPS led go out on both the XO and Rb and the Rb unit thinks it has a GPS lock? Jerry -Original Message- From: k1...@att.net Sent: Sunday, October 31, 2021 10:36 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK Thanks Bob, I swapped with a known good antenna from my TBolt and still no tracking. The XO is putting out 5vdc on the antenna jack. I think I have a spare Motorola UT+ to try and will report back. Jerry -Original Message- From: Bob kb8tq Sent: Sunday, October 31, 2021 9:47 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK Hi I think you will find that the list of “visible” sats is coming from the stored almanac and your position (from the hold mode). You may have an antenna problem. Bob > On Oct 31, 2021, at 7:21 PM, k1...@att.net wrote: > > Here's a follow-up.. > > I took out the XO pcb's and powered it up stand-alone. In the RFTGM > software, it shows as Active, Warmup, No Fail code and it is > outputting a clean 15MHz sine wave. In GPS - It's showing 8 visible > Sats but Zero Tracking SATs and is "Acquiring SATS/Position Hold" . > The SAT IDs are listed but Signal Strength and Channel Status are all > zero. Its been powered up for about an hour so far. Checking XO > Voltages, all seems good Control=14.574V, Temp 36.49, Ant Feed 16mA. The ADC > = 0v as I think it > would be in warm-up mode. Now hopefully it will acquire and run for a > while. > > Jerry > > > > From: k1...@att.net > Sent: Sunday, October 31, 2021 10:20 AM > To: 'time-nuts@lists.febo.com' > Subject: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK > > I have had a KS-24019 (L108-L109) pair running continuously for > several years. Now have a red LED Fault on the XO unit and the RB unit shows > green > LED On-Line status. The NO-GPS LEDs are off on both the -XO and -RB units > but if I disconnect the antenna - they do show Yellow NO_GPS status. Got > out my old XP laptop and ran the Lucent software. The Rb (REF 0) is > active and locked to GPS and working fine. The XO says Unit Failed > but the message code for the first 4 hex nibbles which should show > alarm status are all zero bits so no failure code is evident. The > last 2 alarm nibbles are 53 representing the # of hours since failure. > The GPS time is correct on the Rb but is fixed on the XO at 80-01-06 > 00:00:00. The XO checksum shows PASS. > Based on this the XO GPS is working, locked and sending correct GPS messages > to Rb. The XO CPU seems to be working as well so am I correct this seems > to be a Osc failure? Besides checking voltages (which I'm not sure > what they should be) - any advice how to go about further testing sand repair? > > Thanks in advance > > Jerry NY2KW > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and > follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK
Thanks Bob, I swapped with a known good antenna from my TBolt and still no tracking. The XO is putting out 5vdc on the antenna jack. I think I have a spare Motorola UT+ to try and will report back. Jerry -Original Message- From: Bob kb8tq Sent: Sunday, October 31, 2021 9:47 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK Hi I think you will find that the list of “visible” sats is coming from the stored almanac and your position (from the hold mode). You may have an antenna problem. Bob > On Oct 31, 2021, at 7:21 PM, k1...@att.net wrote: > > Here's a follow-up.. > > I took out the XO pcb's and powered it up stand-alone. In the RFTGM > software, it shows as Active, Warmup, No Fail code and it is > outputting a clean 15MHz sine wave. In GPS - It's showing 8 visible > Sats but Zero Tracking SATs and is "Acquiring SATS/Position Hold" . > The SAT IDs are listed but Signal Strength and Channel Status are all > zero. Its been powered up for about an hour so far. Checking XO > Voltages, all seems good Control=14.574V, Temp 36.49, Ant Feed 16mA. The ADC > = 0v as I think it > would be in warm-up mode. Now hopefully it will acquire and run for a > while. > > Jerry > > > > From: k1...@att.net > Sent: Sunday, October 31, 2021 10:20 AM > To: 'time-nuts@lists.febo.com' > Subject: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK > > I have had a KS-24019 (L108-L109) pair running continuously for > several years. Now have a red LED Fault on the XO unit and the RB unit shows > green > LED On-Line status. The NO-GPS LEDs are off on both the -XO and -RB units > but if I disconnect the antenna - they do show Yellow NO_GPS status. Got > out my old XP laptop and ran the Lucent software. The Rb (REF 0) is > active and locked to GPS and working fine. The XO says Unit Failed > but the message code for the first 4 hex nibbles which should show > alarm status are all zero bits so no failure code is evident. The > last 2 alarm nibbles are 53 representing the # of hours since failure. > The GPS time is correct on the Rb but is fixed on the XO at 80-01-06 > 00:00:00. The XO checksum shows PASS. > Based on this the XO GPS is working, locked and sending correct GPS messages > to Rb. The XO CPU seems to be working as well so am I correct this seems > to be a Osc failure? Besides checking voltages (which I'm not sure > what they should be) - any advice how to go about further testing sand repair? > > Thanks in advance > > Jerry NY2KW > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and > follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK
Hi I think you will find that the list of “visible” sats is coming from the stored almanac and your position (from the hold mode). You may have an antenna problem. Bob > On Oct 31, 2021, at 7:21 PM, k1...@att.net wrote: > > Here's a follow-up.. > > I took out the XO pcb's and powered it up stand-alone. In the RFTGM > software, it shows as Active, Warmup, No Fail code and it is outputting a > clean 15MHz sine wave. In GPS - It's showing 8 visible Sats but Zero > Tracking SATs and is "Acquiring SATS/Position Hold" . The SAT IDs are > listed but Signal Strength and Channel Status are all zero. Its been > powered up for about an hour so far. Checking XO Voltages, all seems good > Control=14.574V, Temp 36.49, Ant Feed 16mA. The ADC = 0v as I think it > would be in warm-up mode. Now hopefully it will acquire and run for a > while. > > Jerry > > > > From: k1...@att.net > Sent: Sunday, October 31, 2021 10:20 AM > To: 'time-nuts@lists.febo.com' > Subject: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK > > I have had a KS-24019 (L108-L109) pair running continuously for several > years. Now have a red LED Fault on the XO unit and the RB unit shows green > LED On-Line status. The NO-GPS LEDs are off on both the -XO and -RB units > but if I disconnect the antenna - they do show Yellow NO_GPS status. Got > out my old XP laptop and ran the Lucent software. The Rb (REF 0) is active > and locked to GPS and working fine. The XO says Unit Failed but the message > code for the first 4 hex nibbles which should show alarm status are all zero > bits so no failure code is evident. The last 2 alarm nibbles are 53 > representing the # of hours since failure. The GPS time is correct on the > Rb but is fixed on the XO at 80-01-06 00:00:00. The XO checksum shows PASS. > Based on this the XO GPS is working, locked and sending correct GPS messages > to Rb. The XO CPU seems to be working as well so am I correct this seems > to be a Osc failure? Besides checking voltages (which I'm not sure what > they should be) - any advice how to go about further testing sand repair? > > Thanks in advance > > Jerry NY2KW > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ___ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK
Here's a follow-up.. I took out the XO pcb's and powered it up stand-alone. In the RFTGM software, it shows as Active, Warmup, No Fail code and it is outputting a clean 15MHz sine wave. In GPS - It's showing 8 visible Sats but Zero Tracking SATs and is "Acquiring SATS/Position Hold" . The SAT IDs are listed but Signal Strength and Channel Status are all zero. Its been powered up for about an hour so far. Checking XO Voltages, all seems good Control=14.574V, Temp 36.49, Ant Feed 16mA. The ADC = 0v as I think it would be in warm-up mode. Now hopefully it will acquire and run for a while. Jerry From: k1...@att.net Sent: Sunday, October 31, 2021 10:20 AM To: 'time-nuts@lists.febo.com' Subject: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK I have had a KS-24019 (L108-L109) pair running continuously for several years. Now have a red LED Fault on the XO unit and the RB unit shows green LED On-Line status. The NO-GPS LEDs are off on both the -XO and -RB units but if I disconnect the antenna - they do show Yellow NO_GPS status. Got out my old XP laptop and ran the Lucent software. The Rb (REF 0) is active and locked to GPS and working fine. The XO says Unit Failed but the message code for the first 4 hex nibbles which should show alarm status are all zero bits so no failure code is evident. The last 2 alarm nibbles are 53 representing the # of hours since failure. The GPS time is correct on the Rb but is fixed on the XO at 80-01-06 00:00:00. The XO checksum shows PASS. Based on this the XO GPS is working, locked and sending correct GPS messages to Rb. The XO CPU seems to be working as well so am I correct this seems to be a Osc failure? Besides checking voltages (which I'm not sure what they should be) - any advice how to go about further testing sand repair? Thanks in advance Jerry NY2KW -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
