Dave, Thanks for the tips. I also got a message off list telling me about the EFC issue and that I missed this discussion recently on the list.
Last night, I power cycled the Z3801A. It has been running all night. Attached is the graph you requested. If I read this correctly, yes, it looks like the unit has maxed out the EFC voltage one way. Joe Gray W5JG On Thu, Feb 25, 2016 at 1:54 AM, Artek Manuals <manu...@artekmanuals.com> wrote: > On 2/24/2016 11:37 PM, Joseph Gray wrote: >> >> I just took a look at my Z3801A that has been in holdover for some >> time. I have been too busy to do anything about it until now. >> >> Before looking at the receiver stats just now, my first guess was that >> the Oncore GPS board went bad. However, I see that it is currently >> tracking 4 sats. I also see that the 1pps is invalid. Does this still >> point to a failed Oncore board? >> >> Attached is a screenshot showing the receiver stats. >> >> I will open this thing up over the weekend to check voltages and such. >> Until then, any tips on where to look are appreciated. >> >> Joe Gray >> W5JG > > > > Joe > > I'm no expert since I've only just begun playing with my Z3801A for the last > 6 weeks after having it in mothballs for 15 years but having just gone > through a Oncore failure on the surface it seems unlikely I would wish for > slightly better signal strengths but I dont know what you experienced in the > past. > > I am led to believe that EFC errors are typically associated with the > Oscillator unit itself rather than the Oncore receiver,My first guess after > that is the 10811 oscillator has "aged" out of a correctable range. In Z38xx > program open the the graph window and send us a screen shot of that window, > this should give us and idea of what the actual EFC value and behavior was > just before things died. > > My next instinct ( but wait for a few other more experienced comments come > out) is to turn the unit off and let it cool down for a day then do a cold > start :SYSTEM:PRESET followed by a GPS:POS;SURV:ONCE command and see if it > re-initializes. Takes about 2 hours typically since you have known good > position data. > > There is a description of the power supply and oven control circuitry for > the oven on KO4BB.com .search for Z3801A in the MANUALS section You are > basically looking to see if +/- 15VDC and +5VVDC lines are correct > > Dave > NR1DX > > > -- > Dave > manu...@artekmanuals.com > www.ArtekManuals.com > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >
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