Wrt my lengthy post above, the fault light on ref-0 never went out. Ref-1 worked as expected and ref-0 continued to output 10Mhz but not the 15Mhz which continued to be supplied by ref-1. The 'on' light was lit on ref-1; ref-0 posted a fault light.
For the heck of it, I pulled the power on ref-1. The 'no gps' light was lit on ref-0 which continued to display 'fault'. I would have expected ref-0 to go into hold over and output the 15Mhz, but it didn't. It seems like it outputs 10Mhz all the time.
I then power cycled both units. After going thru the blink test, the 'on' light on ref-0 lit and it started to output 15Mhz. I would have expected it to do this when I pulled the power on ref-1 forcing a fail over, but it didn't. Also, I had changed the power on default to use the last position so it wasn't doing a survey again.
After about 10 minutes of ref-0 outputting 15Mhz with the 'on' and 'fault' lights lit (prior to full gps lock), ref-0 posted errors in the log:
15Mhz Failure Set
Failed Mode Entered
At that point, ref-1 lit its 'on' light and started outputting 15Mhz. So I guess ref-0 saw a failure and it failed over to ref-1.
I then cycled the power again. The errors are still in the log, but ref-0 is now doing a survey and acting OK. Both units have the 'no gps' and 'fault' lights lit (prior to the survey which is normal) with ref-0 also having the 'on' light lit and outputting 15Mhz.
So if you can follow the confusing sequence above, the questions are:
1) If you pull the power on the active unit ('on' light lit), shouldn't it transfer to the other? If the unit you pull power from is ref-1 with the gps, it should go into hold-over; if you pull ref-0 (without gps) shouldn't ref-1 just take over and not go into hold over? You would lose the 10Mhz from ref-0, of course.
2) Based on the sequence above, I suspect my ref-0 which is posting the '15Mhz failure set' errors to have a problem. It transferred twice to the ref-1 unit. At first I thought it was because of the power failure but now I suspect not.
3) Does anybody know how it monitors the 15Mhz output to be able to tell when it has a failure?
4) It seems like the 10Mhz is always running. Is this gps locked? If so, I would not expect to see it if the gps wasn't up.
5) Under normal operation, what lights are lit on your units? Which of the two is the default for 15Mhz? I thought when my set were working correctly, ref-1 was in standby and ref-0 had the 'on' light lit and was outputting both 10Mhz and 15Mhz.
I am using 19.6V to drive both of them. I had seen posted that the DC-DC converter takes anything from 18 to like 36V. I plan to build a better power supply but I am starting to think maybe I am too close to the 18V.
Sorry for the long confusing posts.
Jerry