Thanks Bob, No rust just a couple of electrolytics leaked taking out a couple of nearby parts. Everything else looks very nice.
I might be able to find another 10811 to try. I thought there were different versions The specified one was supposed to be special low phase noise. But I know nothing about this as I am a rookie. This is the setup as I forgot to post it in original post 5370B TI 1PPS from HP GPSDO to Arm External arm 10 MHZ form HP GPSDO to start Stop is 5 MHz output from HP105B 5MHz The ADEV is terrible There is a sawtooth on the Original Phase difference linear residual that seems very repeatable and may explain the apparent jitter of the output. Dave On Sun, Dec 13, 2020 at 4:31 PM Bob kb8tq <[email protected]> wrote: > Hi > > If the inside of the 105 went under water long enough to rust out a lot > of parts on the boards, it’s a good bet that the 10811 in the unit got > hit pretty hard as well. > > Simple answer: Spend $40 on an eBay replacement for the 10811. > It should just plug in …. > > Bob > > > On Dec 13, 2020, at 5:15 PM, Dave Miller <[email protected]> wrote: > > > > I am in the middle of resurrecting a HP105B, It is one of the later > models > > with an 10811 in. > > > > I have fixed the obvious issues like the electrolytics that were missing > > and other parts that had leads evaporated due to corrosion. > > > > The basics seem to work, A not bad looking sine wave etc. > > But the ADEV numbers are terrible. > > I am going back to make sure it's not a measurement setup issue. That is > > good. Just tested another OCXO and the test setup is good. > > Attached in a link to a .tim file > > https://www.dropbox.com/s/zebwiqy913v7k0k/HP105B%20test.tim?dl=0 > > I am hoping one of the more knowledgeable folks might suggest where to > > start looking. > > I have checked all the other electrolytics and the ESR and capacitance > > looks good. I think the power supply seemed clean. > > > > I have taken out the easy to get boards and cleaned card edges etc but > this > > persists. > > > > The saw tooth on the original phase is yelling something at me but I > > don't have a clue. > > > > Thanks > > Dave > > > > -- > > 72 de Dave > > VE7HR > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- 72 de Dave VE7HR _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
