Re: [time-nuts] Mystery hp Ovens For Sale

Bob wrote: The R390 ran at 200 KHz and divided by two, but that’s an oddball. After the fact they figured out that the approach really did not improve things. Actually, it was the later R390A that used a 200kHz crystal and divided by two. The original (earlier) R390 used a 1MHz crystal and

Re: [time-nuts] Mystery hp Ovens For Sale

Hi As the “prime” for that sort of operation, they could easily have sub-contracted all sorts of things to many different places. The net result could have been all sorts of items made by various outfits that ultimately got a WE tag on them. Bob > On Jun 5, 2016, at 8:36 AM, jimlux

Re: [time-nuts] Mystery hp Ovens For Sale

On 6/5/16 4:40 AM, Eric Scace wrote: http://www.loran-history.info/Johnston_Island/Johnston%20-%20OSC%20Msg%20221416Z%20Oct%2064.pdf states than an O-451/U oscillator was shipped to the Johnston Island LORAN station in 1967. We are getting closer... I am the owner of O-451A/U serial number

Re: [time-nuts] Mystery hp Ovens For Sale

Hi Given the utter PIA that dividing things down used to be, running at 100 KHz is not a bad way to go. The R390 ran at 200 KHz and divided by two, but that’s an oddball. After the fact they figured out that the approach really did not improve things. If you move up to a resonator a bit

Re: [time-nuts] Mystery hp Ovens For Sale

http://www.loran-history.info/Johnston_Island/Johnston%20-%20OSC%20Msg%20221416Z%20Oct%2064.pdf states than an O-451/U oscillator was shipped to the Johnston Island LORAN station in 1967. We are getting closer... I am the owner of O-451A/U serial number 11. I would appreciate any documentation

Re: [time-nuts] Mystery hp Ovens For Sale

In message , cdel...@juno.com writes: >Got an email from someone who has the main unit! > >Found out that the assy. is from an O-451A/U. > >Possibly coast guard. Could be the original LORAN-A/B timebase... As far as I know, LORAN-C was the first

Re: [time-nuts] Mystery hp Ovens For Sale

On 06/04/2016 08:24 AM, Bob Camp wrote: Not accurate, but at least a hand waving sort of number: Bob, It serves a crystal calibrator marker on each 100 kHz of a ten inch dial 600 kHz wide. It is good enough for the job, but not really in the time-nuts realm, except for the accuracy

Re: [time-nuts] Mystery hp Ovens For Sale

Hi The “small” (less than a pound) 100 KHz crystals are not really great in terms of performance. If you get a GT (big thin square plate with attach right in the middle) they can have ok temperature performance. Because of their small size, their Q is relatively low and thus things like phase

Re: [time-nuts] Mystery hp Ovens For Sale

> Le 4 juin 2016 à 06:59, Ian Stirling a écrit : > > It looks like the quartz is in the sealed glass "valve", or "tube". > > I have removed a similar glass vacuum enclosed 100 kHz frequency > marker generator from my Eddystone EA12 receiver that I bought from > Tom Roberts,

Re: [time-nuts] Mystery hp Ovens For Sale

It looks like the quartz is in the sealed glass "valve", or "tube". I have removed a similar glass vacuum enclosed 100 kHz frequency marker generator from my Eddystone EA12 receiver that I bought from Tom Roberts, G3YTO (SK 1985), in September 1978. I don't use the EA12 any more and I wonder

Re: [time-nuts] Mystery hp Ovens For Sale

Insulation and will guess a vacuum flask perhaps around the xtal. Just a guess. Or maybe its all to keep the tube warm. Humor intended. Regards Paul WB8TSL On Fri, Jun 3, 2016 at 5:07 AM, Attila Kinali wrote: > Moin! > > On Thu, 2 Jun 2016 11:21:43 -0700 >

Re: [time-nuts] Mystery hp Ovens For Sale

Moin! On Thu, 2 Jun 2016 11:21:43 -0700 wrote: > All the Rf buffering, AGC, oven control are external and missing. > > Plus it's most likely 100KHz or 1Mhz. > > If I end up junking it I'll post a PIX of the crystal once I dig down and > find it. > > If anyone here wants it

Re: [time-nuts] Mystery hp Ovens For Sale

How about that. There is a tube as you said.Pretty interesting. But I have my sulzers for old technology. Good enuf as they say. I have two HP xtals I can find no info on. Picked them up recently for nothing. They look pretty nice and I will at least check there frequency could be 1 MHz or 100KHz

Re: [time-nuts] Mystery hp Ovens For Sale

Corby congratulations. Fun email to read.I suspect you made them quite the reasonable offer. Enjoy. Paul WB8TSL On Thu, Jun 2, 2016 at 11:58 AM, wrote: > Peter, > > Thanks for the heads up! > > I purchased both units and they arrived yesterday. > > I was worried for a moment

Re: [time-nuts] Mystery hp Ovens For Sale

Hi Early on, I worked for one of the guys who made the crystals for the 106’s. A typical yield after seal was in the 10% range. The parts that didn’t make it in the 10% were scrap. The 10% was not the total loss in the process, just the loss after they closed up the enclosure. Total yield

Re: [time-nuts] Mystery hp Ovens For Sale

Len Cutler proudly displayed an HP106 in his office. It was one of the examples of Len's philosophy of making the best possible design rather than a "good enough" design. I never heard what happened to it when he passed away. Rick ___ time-nuts

Re: [time-nuts] Mystery hp Ovens For Sale

Hi Peter, Thanks for your keen eye and for sharing this with the group. That massive foot-long cylinder is from the late 60's double oven HP 106, the best vintage quartz frequency standard hp ever made. I have some here in the "museum"; short-term stability near 2e-13, long-term drift around