Re: [time-nuts] HP 10811 40 Hz low.

Great comments. I can confirm the oven behaviors. The out is not needed. It is controlled from the micro and warms slowly at about 17 volts. Gets to 150 F after a solid hour as long as its insulated other wise it has a hard time keeping up with ambient air. The 10811 does heat quickly to the 85C.

Re: [time-nuts] HP 10811 40 Hz low.

Hi The “outer oven” on the Z3801 10811’s is simply a warmup heater to improve performance when the unit starts at -40C. When operated as designed, it is effectively “gone” in normal operation. The 10811’s normal oven circuit (“inner oven”) on the modified 10811 is still what does all of the

Re: [time-nuts] HP 10811 40 Hz low.

I had a reference problem on my Z3801A years ago, and ultimately found that the opamp that controls the 10811 oven temperature was bad. I think it turned out there was a bad batch of certain date codes. Replacing the IC with an equivalent type fixed it right up, with no other changes or

Re: [time-nuts] HP 10811 40 Hz low.

Hi If it is a crystal, a broken seal on the can is a pretty good guess. Often this runs up the resistance as well. Bob > On Dec 15, 2016, at 8:57 PM, paul swed wrote: > > Bob > Took your advise and did check all of the caps in teh oscillator along with > resistors. All

Re: [time-nuts] HP 10811 40 Hz low.

Bob Took your advise and did check all of the caps in teh oscillator along with resistors. All are as they should be. Though they do differ from the schematic I have for the HP 10811. But thats normal reality on HP stuff. So it is a sick 10811. So at this stage I have jacked a external 10 MHz

Re: [time-nuts] HP 10811 40 Hz low.

Hi Crystals do indeed fail. In the case of 40 Hz low, I’d look for a shorted cap in series with the crystal. Bob > On Dec 14, 2016, at 5:23 PM, paul swed wrote: > > I have a hp z3801 that is spare parts it never worked correctly. Did some > digging and at least one major

[time-nuts] HP 10811 40 Hz low.

I have a hp z3801 that is spare parts it never worked correctly. Did some digging and at least one major issue is the actually HP 10811 is 38 Hz low. It needs to be within a Hz. Checked everything feeding voltage and such and they are solid at 5.7V from the regulator. The varicap works as

[time-nuts] HP-10811 double oven oscillator outer oven controller boards

I also added the HP10811 double oven board to Dirty PCB's shared projects. 10 boards will cost you a whopping $25 (They usually send you couple of extras if they had good yields). http://dirtypcbs.com/view.php?share=22492=f5a69b7619ce8f139bb9d1ea789ad45e

[time-nuts] HP-10811 double oven oscillator outer oven controller schematic

I got a couple of requests for the schematic... apparently the old link is dead. Here is Warren's original drawing. Buy the man a beer... The only change that I made was using a single high-beta (say 1000) transistor to drive the heater. Warren used two transistors. All the part numbers

[time-nuts] HP-10811 double oven oscillator outer oven controller PCB

I put my circuit board layout (Eagle .BRD file) for Warren Sarkison's outer oven controller for the HP-10811 double oven oscillator onto OSHPARK.COM's shared projects. You can order boards from OSHPARK or download the .BRD file and send it to your favorite board maker.

[time-nuts] HP 10811

Warren, What is the purpose of "Unseal the internal tuning nut by loosing it ~ 1/2 turn"? And which internal tuning nut are you referring to? Cheers, Corby ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP 10811

. But if you want nut performance, best not to use the same supply for them. I start with a 15V supply, so that there is no interaction between circuits. ws * From: Richard (Rick) Subject: Re: [time-nuts] HP 10811 On 2/11/2016 2:56 PM, ws at Yahoo via time-nuts wrote: >

Re: [time-nuts] HP 10811

Joe The inner oven voltage needs to be stable! To better than 0.1V. Unlike the single oven unit, the inner oven on the dual oven unit runs fine at 15 Volts. It draws a couple hundred ma after warm-up. One thing that improves the performance of a dual oven 10811 when being used in a standalone

[time-nuts] HP 10811

I have a spare 10811 that I want to setup as a standalone reference. Since it is a double oven unit, should I put it and the power supply in just a single walled plastic or metal box? Should I make air vents or not? Going to extremes, can I put the OCXO inside a thick Styrofoam box with no air

Re: [time-nuts] HP 10811-60165 Double Oven

In message 6B73B186D5BB46E497D773717A4A03D1@pc52, Tom Van Baak writes: Wonderfully, if you google for: HP 10811-60165 pinouts you get a bunch of time-nuts pages with the info you want. Isn't it high time we create a time-nuts wiki somewhere ? -- Poul-Henning Kamp | UNIX

Re: [time-nuts] HP 10811-60165 Double Oven

Message - From: KA2WEU--- via time-nuts time-nuts@febo.com To: time-nuts@febo.com Sent: Thursday, August 13, 2015 1:14 PM Subject: [time-nuts] HP 10811-60165 Double Oven Who can help me with the connection information ? http://www.ebay.com/itm/HP-10811-60165-Double-Oven-CRYSTAL-OSCILLATOR

[time-nuts] HP 10811-60165 Double Oven

Who can help me with the connection information ? http://www.ebay.com/itm/HP-10811-60165-Double-Oven-CRYSTAL-OSCILLATOR-10Mhz- /281062658455 Ulrich In a message dated 8/13/2015 4:10:33 P.M. Eastern Daylight Time, paulsw...@gmail.com writes: OK I can contribute at

Re: [time-nuts] HP 10811-60165 Double Oven

Of Tom Van Baak Sent: Thursday, August 13, 2015 4:36 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811-60165 Double Oven Hi Ulrich, Wonderfully, if you google for: HP 10811-60165 pinouts you get a bunch of time-nuts pages with the info you want

[time-nuts] HP 10811 variants for sale

Hi, I'm going through my collection of 10811 variants and listing them on ebay over the next couple months. Two 10811B are listed now. Watch user ID corbymite. Cheers, Corby Dawson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

[time-nuts] HP 10811 - 60165 Info Request

I have acquired one of these double oven oscillators. Seems like a useful thing. Need info on pin outs, and operating voltages. Also any other useful information or links to same would be appreciated. Please reply off list with any files of specs etc to my email - johncr...@aol.com All help

Re: [time-nuts] HP 10811 - 60165 Info Request

: [time-nuts] HP 10811 - 60165 Info Request I have acquired one of these double oven oscillators. Seems like a useful thing. Need info on pin outs, and operating voltages. Also any other useful information or links to same would be appreciated. Please reply off list with any files of specs etc

Re: [time-nuts] HP 10811 - 60165 Info Request

Thanks to TVB for hosting this manual containing info for most models of the venerable 10811. http://www.leapsecond.com/museum/10811a/10811a.pdf Thomas Knox To: time-nuts@febo.com From: johncr...@aol.com Date: Mon, 10 Mar 2014 14:17:58 -0400 Subject: [time-nuts] HP 10811 - 60165 Info

Re: [time-nuts] HP 10811 - 60165 Info Request

Power (+12V) 3 - ORG Oven Monitor Return (Com) 4 - YEL Oven Monitor Output 5 - GRN Oven Power (+18-24V) 6 - BLU Oven Return (Com) Thomas Knox ** To: time-nuts at febo.com From: johncroos at aol.com Date: Mon, 10 Mar 2014 14:17:58 -0400 Subject: [time-nuts] HP 10811 - 60165 Info Request

[time-nuts] HP 10811-60165 Double Oven Crystal Oscillator Pin-Outs

I've seen a pin-out for the outer-oven 6-position connector (2 heater wires, 2 thermistor wires), but I've not found anything on the pin-out of the other 6-position connector. Has anyone come across the pin-outs for the 10811-60165 connectors? CS ___

Re: [time-nuts] HP 10811-60165 Double Oven Crystal Oscillator Pin-Outs

Chris, The 10811-60165 may be similar to the HP 10811-60158 that uses using the following pin-out: 1 - BRN Oscillator Return (Com) 2 - RED Oscillator Power (+12V) 3 - ORG Oven Monitor Return (Com) 4 - YEL Oven Monitor Output 5 - GRN Oven Power (+18-24V) 6 - BLU Oven Return (Com) The following

Re: [time-nuts] HP 10811-60165 Double Oven Crystal Oscillator Pin-Outs

...@febo.com]On Behalf Of Richard H McCorkle Sent: Tuesday, February 18, 2014 11:07 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811-60165 Double Oven Crystal Oscillator Pin-Outs Chris, The 10811-60165 may be similar to the HP 10811-60158 that uses using

Re: [time-nuts] HP 10811-60165 Double Oven Crystal Oscillator Pin-Outs

or somewhere else? CS -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]On Behalf Of Richard H McCorkle Sent: Tuesday, February 18, 2014 11:07 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811-60165 Double Oven

Re: [time-nuts] HP 10811 update

On 26/07/13 22:16, Bob Camp wrote: Hi Well if you get desperate to try it, I have CO2 and a chamber sitting in the garage. The biggest issue is that if we use too much CO2 for the chamber, the beer may go flat… Can't have that in the name of science, we need good beer after the

Re: [time-nuts] HP 10811 update

Hi On Jul 31, 2013, at 5:23 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 26/07/13 22:16, Bob Camp wrote: Hi Well if you get desperate to try it, I have CO2 and a chamber sitting in the garage. The biggest issue is that if we use too much CO2 for the chamber, the beer may

Re: [time-nuts] HP 10811 update

Hi Ok, since it's moved *down* and it's about on temperature there are a couple of likely possibilities: 1) The crystal leaks and there's air in it 2) The trap coil(s) / capacitor(s) have changed value 3) The varicap is shorted / forward biased Normal factory troubleshoot (after checking

Re: [time-nuts] HP 10811 update

Good comments. Indeed I will order up a new xtal from digi-key. They should be in stock any day now. I do agree with the comment on the cap in parallel. I had not thought about the series cap dropping and there is a .1uf as I recall. Need to look. The varicap seems to work very well so don't

Re: [time-nuts] HP 10811 update

Hi HP spec'd the crystals to be at a 1x10^-8 / C slope at the marked temperature on the crystal. The center of the curve should be in the vicinity of 90C. You are ~ -4.5 x 10^-6 low, so that would be 10 C away from that point going cold and a bit further going hot. Since the oven is at

Re: [time-nuts] HP 10811 update

sounds like time to add a R across the temp set R. That will lower the R and raise the temp. Its also easy to actually do. Thanks On Fri, Jul 26, 2013 at 12:08 PM, Bob Camp li...@rtty.us wrote: Hi HP spec'd the crystals to be at a 1x10^-8 / C slope at the marked temperature on the crystal.

Re: [time-nuts] HP 10811 update

Hi Paul, Did you see this page that talks about tweaking the 10811 oven controller? http://www.realhamradio.com/z3801a-turning-point.htm Ed On 7/26/2013 10:47 AM, paul swed wrote: sounds like time to add a R across the temp set R. That will lower the R and raise the temp. Its also easy to

Re: [time-nuts] HP 10811 update

Yes thanks ran across it. Skimmed it. Did not think I would be doing it. :-) On Fri, Jul 26, 2013 at 1:15 PM, Ed Palmer ed_pal...@sasktel.net wrote: Hi Paul, Did you see this page that talks about tweaking the 10811 oven controller?

Re: [time-nuts] HP 10811 update

Ed Palmer wrote: Hi Paul, Did you see this page that talks about tweaking the 10811 oven controller? http://www.realhamradio.com/z3801a-turning-point.htm Ed Although this article anecdotally claims success, it overlooks a number of important issues. First of all, a large proportion of

Re: [time-nuts] HP 10811 update

Rick Thanks. But I am far simpler than that. I am trying to get the 10811 back to 10 Mhz its -45Hz. In the long thread above I go into the troubleshooting details so far. Because a crystal simply can't go this bad. :-) I hope not at least. Regards Paul. On Fri, Jul 26, 2013 at 1:38 PM, Rick

Re: [time-nuts] HP 10811 update

Hi Doing any real adjustment on these OCXO's pretty much requires you have a temperature chamber and a pretty good standard. A GPSDO will do for the standard, the chamber is a bit harder to come by. Bob On Jul 26, 2013, at 1:38 PM, Rick Karlquist rich...@karlquist.com wrote: Ed Palmer

Re: [time-nuts] HP 10811 update

So laying a sock over the insulated oven can doesn't count? Its a thick sock. Still not at the stage of needing a chamber I am 45 Hz off. On Fri, Jul 26, 2013 at 2:36 PM, Bob Camp li...@rtty.us wrote: Hi Doing any real adjustment on these OCXO's pretty much requires you have a temperature

Re: [time-nuts] HP 10811 update

Hi Tossing a nice fluffy towel over it works pretty well. Just the thing if you are doing a bench turn hunt on an AT based OCXO. It's also a quick way to answer the age old question is it broke or is it just all the people walking by while I'm trying to test it. You need something that will

Re: [time-nuts] HP 10811 update

Bob I think the power bill exceeds the cost of a 10811. The chamber and CO2. Going to pass.Though I am sure I can run down to work and throw a unit in the various walk in units we have. Suspect they will not appreciate me adjusting the temps though. Back to work as they say. Regards Paul WB8TSL

Re: [time-nuts] HP 10811 update

Hi Well if you get desperate to try it, I have CO2 and a chamber sitting in the garage. The biggest issue is that if we use too much CO2 for the chamber, the beer may go flat… Bob On Jul 26, 2013, at 4:09 PM, paul swed paulsw...@gmail.com wrote: Bob I think the power bill exceeds the cost

Re: [time-nuts] HP 10811 update

and frequency measurement time-nuts@febo.com Sent: Wednesday, July 24, 2013 9:29 PM Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. I was quite

Re: [time-nuts] HP 10811 update

...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, July 24, 2013 9:29 PM Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma

Re: [time-nuts] HP 10811 update

To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811 update I find it hard to believe that NTE spec the 123AP to replace a transistor with min beta of 500... This is quite entertaining: http://www.vetco.net/catalog/product_info.php?products_id=1856 Look at the parts it's

Re: [time-nuts] HP 10811 update

and frequency measurement Subject: Re: [time-nuts] HP 10811 update I find it hard to believe that NTE spec the 123AP to replace a transistor with min beta of 500... This is quite entertaining: http://www.vetco.net/catalog/product_info.php?products_id=1856 Look at the parts it's supposed

Re: [time-nuts] HP 10811 update

paul swed wrote: I can't believe you found the transistor. When I pulled it out last night, its actually a MPSA18!!! I had not had time to look it up but figured it was a ebay leftover hunt. :-) At that price I may order 20 of them. Like the gain. Toshiba used to make a transistor with even

Re: [time-nuts] HP 10811 update

measurement Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. I was quite surprised by this current level. I was guessing the oscillator was a few mils

Re: [time-nuts] HP 10811 update

Well lucks not so good do have the voltage closer but as Bob C said. That ain't the issue. Darn I hate when he is right. By the way the oscillator draws 26 ma approx as a reference. Reassembled everything and let the oven heat up it settles at 81C 15 min after start and within a respectable range

Re: [time-nuts] HP 10811 update

On 7/25/2013 8:32 PM, paul swed wrote: Well lucks not so good do have the voltage closer but as Bob C said. That ain't the issue. this may is a dumb question: Lower than expected frequency means some extra capacitance in parallel or not enough in series with the crystal... ? Would that put

[time-nuts] HP 10811 update

Hello to the group. Numbers of threads running on the HP 10811. Mine is 45 Hz low. The oven is most likely ok. I did get the can open per the various other threads and the web pix. Started testing the circuits and have found that the regulator for the oscillator isn't. Its supposed to produce 5.7V

Re: [time-nuts] HP 10811 update

Thanks Charles. I suspect all said the regulated output delivers 1 ma. It doesn't feed much. I have the 2n3904s so cheap test to see if that picks up the 45 Hz On Wed, Jul 24, 2013 at 3:20 PM, Charles P. Steinmetz charles_steinm...@lavabit.com wrote: Paul wrote: Q4 a 2n6429. What

[time-nuts] HP 10811 update

2N6429... $1 each: http://www.talonix.com/shop/item.aspx?itemid=3522 ___ 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

Re: [time-nuts] HP 10811 update

Hi The regulator should be fixed, and the OCXO will work better with it repaired. That said, shifting the regulated voltage from 5.7 to 5.27 volts should not shift that oscillator 45 Hz. Bob On Jul 24, 2013, at 9:00 AM, paul swed paulsw...@gmail.com wrote: Hello to the group. Numbers of

Re: [time-nuts] HP 10811 update

I can hope I will embed a k thermocouple also. On Wed, Jul 24, 2013 at 7:45 PM, Bob Camp li...@rtty.us wrote: Hi The regulator should be fixed, and the OCXO will work better with it repaired. That said, shifting the regulated voltage from 5.7 to 5.27 volts should not shift that oscillator

Re: [time-nuts] HP 10811 update

Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. I was quite surprised by this current level. I was guessing the oscillator was a few mils and the buffer maybe 8. The 2n3904 simply does not cut

Re: [time-nuts] HP 10811 update

swed Sent: Thursday, 25 July 2013 11:29 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. I

Re: [time-nuts] HP 10811 update

[mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Wednesday, July 24, 2013 8:29 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its

Re: [time-nuts] HP 10811 update

and frequency measurement Subject: Re: [time-nuts] HP 10811 update Well learned quite a bit Q4 does have an issue. Further there is a reason it has such high Beta. Its must deliver 30 ma to the oscillator and buffer. I was quite surprised by this current level. I was guessing the oscillator was a few

Re: [time-nuts] HP 10811 Tuning Diode

into the problem any farther. Anyone have any more info or ideas? 73, Tom WB6UZZ --- On Thu, 10/18/12, John Miles jmi...@pop.net wrote: From: John Miles jmi...@pop.net Subject: Re: [time-nuts] HP 10811 Tuning Diode To: 'Discussion of precise time and frequency measurement' time-nuts

Re: [time-nuts] HP 10811 Tuning Diode

Of Adrian Sent: Thursday, October 18, 2012 12:19 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] HP 10811 Tuning Diode Hello, I found the 10811 in my 8662A to be quite noisy and was able to trace the problem down to the tuning diode. Actually, the phase noise started

Re: [time-nuts] HP 10811 Tuning Diode

: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of John Miles Sent: Thursday, October 18, 2012 11:55 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP 10811 Tuning Diode That's extremely interesting, Adrian. I've never heard

Re: [time-nuts] HP 10811 Tuning Diode

I wonder if the glass case got a crack in it or if the kovar seal was failing. Maybe a failed solder joint (which gets fixed when you install the new diode). I've never heard of a noisy varactor before either. Rick ___ time-nuts mailing list --

Re: [time-nuts] HP 10811 Tuning Diode

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Rick Karlquist Sent: Friday, October 19, 2012 11:01 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811 Tuning Diode I wonder if the glass case got a crack in it or if the kovar seal was failing

Re: [time-nuts] HP 10811 Tuning Diode

Slightly off topic: the oscillator transistor has some 1854- part number, but is actually a 2N5179 selected for some minimum fT at 30 mADC collector current. When the oscillator starts up, before the ALC takes effect, a fairly large DC current can flow and some 2N5179's don't have enough

Re: [time-nuts] HP 10811 Tuning Diode

I didn't notice any damage, nor was there a visibly bad solder joint. However, I couldn't reproduce the excess noise with a quick bench test at 30V / 100k neither. DC-wise there are a few microvolts only. Same with the SMD diode. Exept, when the original glass diode is exposed to light. With a

Re: [time-nuts] HP 10811 Tuning Diode

Of Adrian Sent: Friday, October 19, 2012 4:10 PM To: rich...@karlquist.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 10811 Tuning Diode I didn't notice any damage, nor was there a visibly bad solder joint. However, I couldn't reproduce the excess noise

Re: [time-nuts] HP 10811 Tuning Diode

As I mentioned, the varactor is equivalent to the Motorola MV1650. I have a bunch as well left over from building VCXOs. :-) David On 10/19/12 3:37 PM, Rick Karlquist wrote: Slightly off topic: the oscillator transistor has some 1854- part number, but is actually a 2N5179 selected for

Re: [time-nuts] HP 10811 Tuning Diode

, October 19, 2012 9:10 PM Subject: Re: [time-nuts] HP 10811 Tuning Diode I didn't notice any damage, nor was there a visibly bad solder joint. However, I couldn't reproduce the excess noise with a quick bench test at 30V / 100k neither. DC-wise there are a few microvolts only. Same with the SMD

Re: [time-nuts] HP 10811 Tuning Diode

[mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Friday, October 19, 2012 13:20 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP 10811 Tuning Diode Hi The normal 10811 package has several openings in it. Light *might* get

[time-nuts] HP 10811 Tuning Diode

Hello, I found the 10811 in my 8662A to be quite noisy and was able to trace the problem down to the tuning diode. Actually, the phase noise started to jump when the oven heated up. As a quick solution, I replaced it with a SMD type that I had at hands. I would appreciate any hint where to

Re: [time-nuts] HP 10811 Tuning Diode

That would be a Motorola MV1650 or equivalent. You may have to select for 100pf +/- 5% @ 4V as the standard spec is 10% but it probably does not matter as the tuning ratio will be greater than the 2 spec. David On 10/18/12 3:18 PM, Adrian wrote: Hello, I found the 10811 in my 8662A to be

Re: [time-nuts] HP 10811 Tuning Diode

Probably unobtainium. 0122-0244 is shown as Motorola SMV315-24 or MSI Electronics SQ529. For whatever that's worth. Reminds me of a popular audio amplifier design that was in Popular Electronics using Motorola SS1122 diodes. Some special non catalog diode. Turns out Dan Myers, the designer,

Re: [time-nuts] HP 10811 Tuning Diode

Subject: [time-nuts] HP 10811 Tuning Diode Hello, I found the 10811 in my 8662A to be quite noisy and was able to trace the problem down to the tuning diode. Actually, the phase noise started to jump when the oven heated up. As a quick solution, I replaced it with a SMD type that I had at hands

Re: [time-nuts] HP 10811 Tuning Diode

gotten around to digging into the problem any farther. Anyone have any more info or ideas? 73, Tom  WB6UZZ --- On Thu, 10/18/12, John Miles jmi...@pop.net wrote: From: John Miles jmi...@pop.net Subject: Re: [time-nuts] HP 10811 Tuning Diode To: 'Discussion of precise time and frequency

Re: [time-nuts] HP 10811-60111 - successful repair of NTC damage

Congratulations on a job well done and a saved prize piece of technology. John WA4WDL -- From: Frank Stellmach frank.stellm...@freenet.de Sent: Saturday, January 07, 2012 9:17 AM To: time-nuts@febo.com Subject: [time-nuts] HP 10811-60111

Re: [time-nuts] HP 10811 Response I Replies

Does your Mode B 10811 use a different xtral or same xtral, different frequency? What does Mode B do better, ... and worse? Why was it not used in the 10811? When trouble shooting a freq stability problem, usually the more data the better. What can really help to narrow down the cause or see

Re: [time-nuts] HP 10811 Response I Replies

WarrenS wrote: Does your Mode B 10811 use a different xtral or same xtral, different frequency? What does Mode B do better, ... and worse? Why was it not used in the 10811? Mode B is the same crystal on a different frequency (about 10.95 MHz). It does not have a turnover and the tempco is

Re: [time-nuts] HP 10811 Response I Replies

On 23/09/11 05:40, Richard (Rick) Karlquist wrote: On 9/22/2011 5:17 PM, ws at Yahoo wrote: Within minutes the frequency changed more than the spec For humidity to get thru something like that it takes weeks or more it does it at all. That fast of reaction, Sure sounds like some other effect

Re: [time-nuts] HP 10811 Response I Replies

I have made plots of the effects of everything I can find that effects the freq of a HP10811. Most things are much slower than minutes, more like an hour time constant, such as anything effecting the outside case's temperature OR the effect is much faster than minutes, things such as voltage

Re: [time-nuts] HP 10811 Response I Replies

WarrenS wrote: I have to wonder if the unit being tested had its high impedance oven control points lifted off the PCB board and on Teflon standoffs like the production units? ws It was a production unit, no modifications whatsoever. The oven change is an interesting theory; I never

Re: [time-nuts] HP 10811 Response I Replies

Magnus Danielson wrote: On 23/09/11 05:40, Richard (Rick) Karlquist wrote: Blowing on the case? Did you consider the increased cooling that higher humidity provides? Cheers, Magnus Against, the frequency change we saw was considerably more than what we got from changing the temperature

Re: [time-nuts] HP 10811 Response I Replies

Maybe you have a bad joint in the tuning circuit and the humidity makes the actual tuning voltage vary. -John === Magnus Danielson wrote: On 23/09/11 05:40, Richard (Rick) Karlquist wrote: Blowing on the case? Did you consider the increased cooling that higher humidity

Re: [time-nuts] HP 10811 Response I Replies

On 23/09/11 23:25, Rick Karlquist wrote: Magnus Danielson wrote: On 23/09/11 05:40, Richard (Rick) Karlquist wrote: Blowing on the case? Did you consider the increased cooling that higher humidity provides? Cheers, Magnus Against, the frequency change we saw was considerably more than

[time-nuts] HP 10811 Response I Replies

Esteemed Colleagues, I will attempt to make a coherent technical reply to the remarks made about my 10811 posting. But first a bit of qualification. My remarks refer to the 10811 and that vintage of OCXO’s. Wrote: Doing what you describe will result in a very sensitive humidity sensor,

Re: [time-nuts] HP 10811 Response I Replies

Perry Sandeen wrote: Wrote: Doing what you describe will result in a very sensitive humidity sensor, having eliminated the thermometer effect. I do not understand. I believed that since the OCXO temperature will be substationally higher than the surrounding temps, any residual moisture

Re: [time-nuts] HP 10811 Response I Replies

You had a leak. If epoxy was really as bad as you indicate, it would not be usable for holding pressure, or mild vacuum, and yet it is. Somehow, someway you left a big hole in the bucket. -Chuck Harris Rick Karlquist wrote: Perry Sandeen wrote: Wrote: Doing what you describe will result in

Re: [time-nuts] HP 10811 Response I Replies

A problem I've seen when using the hermetic sealed soldered version of the 10811 from a dual oven unit, is when the case is sealed the osc makes a good barometer because of changes in its case due to barometric changes. A 1 inch difference (such as 30 to 29) caused something on the order of

Re: [time-nuts] HP 10811 Response I Replies

Within minutes the frequency changed more than the spec For humidity to get thru something like that it takes weeks or more it does it at all. That fast of reaction, Sure sounds like some other effect like blowing a little air on the case or loading the osc output with water in the output

Re: [time-nuts] HP 10811 Response I Replies

Humidity is a confusing subject to many engineers and scientists. Unlike most parameters it is a quantity with two input variables, concentration and temperature. There are many ways to combine these to give different units. As a research scientist I spent most of my career working with composite

Re: [time-nuts] HP 10811 Response I Replies

On 9/22/2011 5:17 PM, ws at Yahoo wrote: Within minutes the frequency changed more than the spec For humidity to get thru something like that it takes weeks or more it does it at all. That fast of reaction, Sure sounds like some other effect like blowing a little air on the case or loading the

[time-nuts] HP 10811 performance and quality

List, Wrote: It was not cheap, it was not high performance, it was not elegant. But it did get product shipped on time. “In the land of the blind the one eyed man is king” Rick, All your statements are most likely 100 percent accurate. You are the expert. The problem for the rest of us is

[time-nuts] HP 10811 Stability

List, Wrote: I have no problems with my 10811. I just want to experiment with ways to improve performance, right now I have several that are in the E-13 YES! Regards, Perrier ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] HP 10811 EFC

I have in the past reversed the varactor, grounding R2 to get a positive tuning voltage from 1.5 to 12 Volt. Also brought out the 5.7 volt for reference purposes. That way every thing was positive. Is easy to get to. But now I have some very good units and I am worried I may change

Re: [time-nuts] HP 10811 EFC

] On Behalf Of ewkeh...@aol.com Sent: Friday, October 29, 2010 5:00 AM To: time-nuts@febo.com Subject: [time-nuts] HP 10811 EFC I have in the past reversed the varactor, grounding R2 to get a positive tuning voltage from 1.5 to 12 Volt. Also brought out the 5.7 volt for reference purposes

Re: [time-nuts] HP 10811 EFC

-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Friday, October 29, 2010 5:00 AM To: time-nuts@febo.com Subject: [time-nuts] HP 10811 EFC I have in the past reversed the varactor, grounding R2 to get a positive tuning voltage from 1.5 to 12 Volt. Also

[time-nuts] HP 10811

I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I have a few ones with AV less than 1E-12 from 1 to 100 sec. I would like to use the +18 Volt in the unit for heater. Has any one experience with running the 10811 below 20 Volt, any thing I should look out for? Thanks

Re: [time-nuts] HP 10811

I think you should probably be fine at 18V. The oven will run down to at least 15V and maybe 12V. Rick Karlquist N6RK On 10/19/2010 5:27 AM, ewkeh...@aol.com wrote: I plan on replacing the Xtal Osc. of my HP 5062C with a HP 10811 since I have a few ones with AV less than 1E-12 from 1 to 100

Re: [time-nuts] HP 10811

Thank you Rick, you obviously must know. Bert Kehren In a message dated 10/19/2010 12:02:11 P.M. Eastern Daylight Time, rich...@karlquist.com writes: I think you should probably be fine at 18V. The oven will run down to at least 15V and maybe 12V. Rick Karlquist N6RK On 10/19/2010 5:27

[time-nuts] -hp- 10811 repair (Thermistor)

The 10811-60111 that came in my 5370B counter turned out to have an open circuit Thermistor in it. This is a non-replaceable part in theory. However, nothing to lose, I have successfully substituted a Digikey Part number: 317-1371 100 kOhm 1% Thermistor ( from Cantherm, part number:

  1   2   >