Re: [time-nuts] HP 106a oscillator connectors question

Those appear to be "Microdot 10-32" S-50 connectors to me. See: https://en.wikipedia.org/wiki/Microdot_connector http://www.cdint.com/catalog/model/BM-174-6 http://www.mouser.com/pdfdocs/TEConnectivity_Nanonics_MicrodotCatalog.pdf --- see page 94

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] HP 106a oscillator connectors question

They look like microdot connectors. Like what I have on my ultrasound transducers. On Jun 3, 2016 3:59 PM, wrote: > Well the checkout of the 106A oscillator section is going well. > > I ran it for 6 hours and the outer oven came down OK, will have to wait > until I can do a

Re: [time-nuts] HP 106a oscillator connectors question

Microdot (now available from TE connectivity) made these for 50 ohm, 75 ohm and 93 ohm coax. Digikey have 50 ohm coax male versions. Bruce On Saturday, 4 June 2016 3:02 PM, Tom Miller wrote: I've seen these used for accelerometer cables.

[time-nuts] Analyzing historical changes in the earth rotation rate.

http://arstechnica.com/science/2016/06/punctual-time-travel-depends-on-how-fast-the-earth-spins/ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

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] HP 106a oscillator connectors question

I've seen these used for accelerometer cables. http://www.ebay.com/itm/Wilcoxon-Meggitt-731-207-Low-Frequency-Seismic-Accelerometer-/301611300986?hash=item46396f387a:g:~vcAAOSwBahVPrby

[time-nuts] HP 106a oscillator connectors question

There is a connector that looks like an SMA connector, but isn't. Unfortunately I don't remember what they are called. I have seen them used on microwave equipment (like VNA's). Some idiots will really try hard to mate them with SMA's, but just damage the connectors... and you don't want

[time-nuts] HP 106a oscillator connectors question

Well the checkout of the 106A oscillator section is going well. I ran it for 6 hours and the outer oven came down OK, will have to wait until I can do a longer attended run for the inner oven as it takes 8 1/2 hours per the manual to come down! This unit was not built with the fine adjust via an

Re: [time-nuts] Clock Block Unavaliable - Alternative Solutions ?

As you only want one frequency you could use the ICS525 which I think the clock block uses and hardwire the relevant select pins. There is a calculator (windows only) available on the IDT site which gives input pin

Re: [time-nuts] GPSDO and PPS measurement precision

On Fri, 3 Jun 2016 18:23:22 +0200 Lars Walenius wrote: > Using Tom van Baak´s GPSDO simulator is very informative as it can limit the > TIC resolution. Oh.. right. I haven't thought about that... I need to see what I can hack up using that.

[time-nuts] Transformer inrush current and transformer simulation

On Fri, 03 Jun 2016 12:37:26 -0400 "Mike Monett" wrote: > I found a significant error in the LTspice analysis. I was wondering how > the current could jump instantaneously at zero when the voltage is applied > at the peak. That violates magnetism. > > It turns out

Re: [time-nuts] GPSDO and PPS measurement precision

By the way: Have anyone compared the 30sec average from the Shera with a TI counter to see the real result? Lars Från: Lars Walenius Skickat: den 3 juni 2016 18:23 Till: Discussion of precise time and frequency measurement Ämne: Re:

Re: [time-nuts] Maser 0.7 nsec jumps solved

To All; I found a significant error in the LTspice analysis. I was wondering how the current could jump instantaneously at zero when the voltage is applied at the peak. That violates magnetism. It turns out it doesn't. When LTspice starts an analysis, it first calculates the operating point. For

[time-nuts] Mystery hp Ovens For Sale

Got an email from someone who has the main unit! Found out that the assy. is from an O-451A/U. Possibly coast guard. It is supposedly a double ovened unit. Does anyone have any info on it? Cheers, Corby ___ time-nuts mailing list --

Re: [time-nuts] GPSDO and PPS measurement precision

Hej, Using Tom van Baak´s GPSDO simulator is very informative as it can limit the TIC resolution. Shera´s design is much more complicated than the 42ns resolution as it depends on the noise in the 24MHz oscillator. With an oscillator with enough noise during a 30 sec period it might be below

[time-nuts] GPSDO and PPS measurement precision

Moin, With all the talk about GPSDOs going on in the last couple of months, I started to wonder how much precision in the measurments is actually needed. On one hand, we have the old GPSDO designs, like Shera's, that offer a resolution in the 40ns range. On the other hand, we have modern designs,

Re: [time-nuts] Maser 0.7 nsec jumps solved

Jim, My head is precisely in the get it away from the unit approach. Did not mention it for the following reason. Its well understood and for time-nut boring. Its more fun to figure out peak currents and such. But I tend to fall into the get it done camp and move on. That doesn't mean its a simple

[time-nuts] Clock Block Unavaliable - Alternative Solutions ?

Hi All, I noticed that the TAPR site now lists the Clock-Block as unavaliable. This is a shame as I was going to experiment with driving some beaglebones with a 24MHz clock from one, multiplied up from a Rb/GPS/LORAN source this summer Does anyone know of a similiar device avaliable elsewhere

Re: [time-nuts] Timelab and the 53220A - getting best results

HI Yes, at 1 second vs 10 seconds the data suggests that the counter is the limit. Unfortunately you can’t make a judgement between 10 an 100 seconds. Certainly at 100 seconds and beyond, the counter is doing just fine. Bottom line: This is why people mess with single and dual mixer setups or

Re: [time-nuts] Phase meter for synchronizing osc's to GPSDO

On Tue, 31 May 2016 13:06:52 -0500 "Bud Patten" wrote: > Back in the spring of 2012 an article was published in VHF Communications > entitled "A Phase Meter: a help to synchronize oscillator's to GPSDO". In > it the authors indicated that they hoped to add a

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] Timelab and the 53220A - getting best results

So what’s going on is that the TIA is “Mr. Magoo” and isn’t seeing sufficiently well to evaluate these oscillators? I can believe that. I might just have to stop there, then. I can’t justify an upgrade today. > On Jun 2, 2016, at 7:24 PM, Bob Camp wrote: > > Hi > > If the

Re: [time-nuts] Maser 0.7 nsec jumps solved

Hi All, Thanks so much for your input and thoughts. It has really proved helpful here at the observatory. As it turned out we easily obtained a zero-crossing solid state relay so we thought we'd try it. And, drumroll.. It made things so much terribly *worse* than ever before. (As