Be great if we might down load it just to look On Thu, Mar 17, 2011 at 4:40 PM, Richard W. Solomon <[email protected]>wrote:
> I forgot to mention, I have a scan of the manual, it's around 7 MB. The > manual > came in pretty poor shape, hence the scan. > > 73, Dick, W1KSZ > > > -----Original Message----- > >From: John Ackermann N8UR <[email protected]> > >Sent: Mar 17, 2011 1:22 PM > >To: Discussion of precise time and frequency measurement < > [email protected]> > >Cc: David Olean K1WHS <[email protected]> > >Subject: Re: [time-nuts] HP106B crystal oscillator > > > >Dave, I haven't seen an actual Manson standard, but I do recall that one > >was listed in an ancient Tucker catalog (from the early 80s). I'm just > >now unpacking my library after our move, and should soon uncover that > >catalog if I still have it. Let me know if you'd like me to scan the > >Manson info for you -- it's only a picture and a few words, plus > >Tucker's used price. > > > >73, > >John > >---- > >On 3/17/2011 3:34 PM, David Olean K1WHS wrote: > >> > >> I have a vintage HP 106B crystal oscillator. It has been sitting around > for a few years and I just recently found a schematic for it. It was enough > so I could dig in and check things out. The first thing I tried when I got > it was to run the unit on external power as the internal PS seemed to be > hosed. The oscillator fired up and stabilized at something very close to 5 > MHz so I suspected that the ovens were working properly. There it sat for a > few years until I found a schematic so I could fix the power supply. > >> The first chore was to remove the old and defunct NiCd battery pack > and I discovered that it was causing the power supply to be NG. I ordered > some new D Cell NiCDs (20 in fact) and rebuilt the NiCd pack. Once the > shorted cells were removed the supply started working again and all voltages > are within range. I was thrilled to get it working. With the new cells in > place, they trickle charge and will run the unit for many hours during power > failures and moves. > >> This HP106B was in the cal lab at Sanders Associates at Nashua, NH. > It was apparently scrapped around 2006, and ended up out in the weather in a > metal scrap yard in Northwood, NH where my brother found it and then he gave > it to me. He knew I liked precision things so figured I would like the > HP106B. (Good thinking!) At present there are only two issues with the unit. > The meter face is cracked and partially broken. But what do you expect from > getting thrown in a dump anyway? The fine tuning gear train has a problem > and seems to be binding up with only a limited range of travel. I hope I can > find a new meter cover. The movement is perfectly fine. > >> Now that it is working, I plugged it in and it has been running for > about 2 weeks. Initial results are encouraging. I set freq with the coarse > adjustment and so far it seems to be quite stable when compared to a Z3801. > My initial setting produced results within 4 parts in 10-9 of the Z3801, and > that has remained pretty much constant these last two weeks. (I compare > frequencies on 10,368 MHz to see how close the counters are) To get the > initial setting, I used an oscilloscope to freeze the two traces (Z3801& > HP106B) I was not too careful but I am encouraged that the drift over 2 > weeks seems to be non existent as far as I can see. Eventually, I will get > up my nerve and attack the fine tuning gear train. First I need to run > things for a few months and try to get a feel for how well the oscillator is > working. Then I have to figure out the best way to calibrate it! > >> I also have a pair of old tube type Manson proportional oven > oscillators. Part #s are RD-140 and RD-146. They are 1 MHz units. I have > one of those running but suspect that they are not very good performers. I > just turned it on, and after a few days still see fluctuations of +/- 0.2 > Hz. Maybe I need to DC regulate the filament of the oscillator tube? That is > an obvious source of error. Possibly I could run it on a constant voltage > transformer to test my theory. These old klunker oscillators are fun. So > much labor went into their construction etc, that I feel it is a sacrilege > to ignominiously heave them into the dumpster. They deserve better! Has > anyone else ever seen these Manson oscillators? > >> > >> Dave Olean K1WHS > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > > >_______________________________________________ > >time-nuts mailing list -- [email protected] > >To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
