[time-nuts] Re: RFTGm-II (KS-24019) XO Fault but GPS to Rb is OK
k1jos at att.net
k1jos at att.net
Mon Nov 1 02:35:50 UTC 2021
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 <kb8tq at n1k.org>
Sent: Sunday, October 31, 2021 9:47 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
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 âvisibleâ 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, k1jos at 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: k1jos at att.net <k1jos at att.net>
> Sent: Sunday, October 31, 2021 10:20 AM
> To: 'time-nuts at lists.febo.com' <time-nuts at 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 at lists.febo.com -- To unsubscribe
> send an email to time-nuts-leave at lists.febo.com To unsubscribe, go to and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts at lists.febo.com -- To unsubscribe send an email to time-nuts-leave at 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
More information about the Time-nuts_lists.febo.com
mailing list