Re: [time-nuts] 10811 Repair (was warmup / bad batch)

and ground wire to the board. The wires are welded to the crystal, so if you want to disconnect one of them, you have to unsolder it from the PC board. Rick Karlquist N6RK Jack Hudler wrote: It's probably the thermistor. What model are you playing with? -Original Message- From: [EMAIL

Re: [time-nuts] 10811 warmup

of all this. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] 10811 warmup

Jack Hudler wrote: Could physical damage to the crystal account for this deviation? Pretty unlikely. If you drop a crystal, it will just break and not work. The only way it could go down 100 Hz is by mass loading. I don't know how this could happen in a sealed unit. Rick Karlquist N6RK

Re: [time-nuts] 10811 warmup (Jason Rabel)

and it would be too hot to handle. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Bad batch of HP10811's

to settle down even after reaching oven temperature. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Bad batch of HP10811's

tempco in the crystal. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Bad batch of HP10811's

No I'm not sure, but 164 ppm sounds high. My anecdotal memory may be faulty. In any event, a 10811 with a bad fuse is obvious: it draws no oven power and the case never gets warm. Rick Jeroen Bastemeijer wrote: Dear Rick, Are you sure the 500Hz is too much for a cold oven? I checked my

Re: [time-nuts] Bad batch of HP10811's

in the field. Rick Karlquist N6RK Mark Amos wrote: Time-nuts, Seems like a bad batch of HP10811's was dumped on e-bay over the holidays... Some (at least 2) won't tune up to 10MHz: one won't adjust above 9,999,530 and the other peaks around 9,999,920 after warming up for a day or so

Re: [time-nuts] Bad batch of HP10811's

with the socket is poor. I think the reason for it was that if the oven ran away, the thermal foam would burn up and out-gas toxic fumes. Ovens very rarely run away. The unit that is 500 Hz off is not due to a cold oven. There isn't that much tempco in the crystal. Rick Karlquist N6RK John Miles

Re: [time-nuts] HP 5345A

of precision was a real pain. I think you meant 1E-10 per DAY, not per year. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] HP 5345A

, or 1E-7 if you are careful, and the expected annual aging is in that ballpark). Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] HP 5345A

that had anything like that level of aging. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] HP 5345A

that, but crystals will jump a part in 1E^9 or so every so often. I've never seen a 10811 crystal without jumps if you wait long enough. I don't know of any other crystal makers who claim to not have jumps. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts

Re: [time-nuts] HP 5334 oscillator performance

frequency standard, so we never used a built in oscillator in a counter. Due to time and cost pressures, we unfortunately inherited the same oscillator in the 5334B. So in both products, please plan on getting a 10811 or using an external frequency reference. Rick Karlquist N6RK Project manager, 5334B

Re: [time-nuts] HP 5345A - Any Experts?

is there some test points I can check to see if a signal is getting through the front? Jason Some HP equipment had a fuse built in to the front panel connector. I would verify with a scope that the signal was actually getting to the PC board. Rick Karlquist N6RK

Re: [time-nuts] Frequency processing scheme of HP5065 vapour rubidium standard

error is typically a few parts in 10^13. The systematic error seems to be below 10^-14. As Magnus said, the solution to this is beam reversal, however that would be too complicated in a compact clock like the 5071. Rick Karlquist ___ time-nuts mailing

Re: [time-nuts] Frequency processing scheme of HP5065 vapour rubidium standard

on the 5071 design process, see our papers from 1992 FCS. Rick Karlquist ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] HP8568B firware eproms anyone ?

likely have failed. Rick Karlquist Poul-Henning Kamp wrote: My HP8568B has started to do weird things, and as far as I can find out, the A15U37 Eprom is hosed. According to the label, the HP partno for the contents is 85660-80080 The chip has a HP partno of 1818-3329 but looks like a regular

Re: [time-nuts] Historical HP quartz oscillator manuals available

I talked to the Agilent Library, and they said that if I donate these manuals, they will be stored but not scanned at this time. I thought I would ask here if there is any interest in any of these manuals. Perhaps I can scan a few myself if there is sufficient interest. Rick Karlquist N6RK

[time-nuts] Historical HP quartz oscillator manuals available

any of the original paper manuals, let me know what you are interested in. I need to dispose of these one way or another. Rick Karlquist N6RK Agilent Technologies ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] questions on uncompensated crystal oscillators

ppm is high precision when it comes to using inverters). If you care about performance, use a transistor to make the oscillator and use the inverter to convert the sine wave to logic levels. If you cannot use a transistor, relax your specs about an order of magnitude. Rick Karlquist

Re: [time-nuts] 10811 Extra Lagging etc

out then back in could be affected by the environment or removing the top cover. The 5061 had a frequency coefficient of microwave power that doesn't exist in the 5071. It wouldn't surprise me if humidity affected the 5061, although I don't have any direct evidence of it. Rick Karlquist N6RK

Re: [time-nuts] 10811 Extra Lagging etc

was limited by crystal frequency jumps, which didn't seem so bad with the 10811 due to the large environment errors in it. In the E1938 they stuck out like a sore thumb. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com

Re: [time-nuts] HP 8445B

I have several of these, but the electromechanical relay contacts have become dirty on all of them. Is anyone familiar with rejuvenating them? Especially the idea of running a fairly high power RF signal through them and hot switching them to burn off the oxide. Rick N6RK Mike Feher wrote:

RE: [time-nuts] Phase Comparator

It specifically addresses the gain/bandwidth zerocrossing detector issues. Peter ZL2AYX Also see John Dick's 1990 PTTI paper on JPL zero crossing detectors. Excellent. Rick Karlquist ___ time-nuts mailing list time-nuts@febo.com https

Re: [time-nuts] Looking for an HP K34-59991A Linear Phase Comparator

It is trivial to build your own out of a couple of flip flops. You can read Michael Fischer's patent on it (circa 1980). Rick Karlquist N6RK NE8S wrote: Gentlemen: Happy Holidays to All Time, Frequency, and Phase Domainers. I am looking for an HP Linear Phase Comparator, Model K34-59991A

Re: [time-nuts] Xtal Oscillator Aging

Poul-Henning Kamp wrote: But did you test it both in horizontal an vertical orientation ? I am not aware of any vertical testing, although the burn racks may have been vertical. The end application had random orientation and no one reported any orientation dependence. Rick Karlquist

RE: [time-nuts] Xtal Oscillator Aging

procedure; and a glass envelope is the best. Cheaper than cheap are the WW2 FT243 Many decades ago, glass was the gold standard. However, cold well metal cans have long since superceded glass. Rick Karlquist N6RK (formerly HP Santa Clara Division

RE: [time-nuts] Interfacing a 8dBm sine output of an OCXO to adigitallogic standard

is then passively limited with diodes. You can also get away with driving a differential pair with a common current source for the emitters. A classic paper on zero crossing detectors by JPL's John Dick at the 1990 PTTI explains the theory behind all this. Rick Karlquist N6RK

RE: [time-nuts] Interfacing a 8dBm sine output of an OCXO to adigital logic standard

to use this with an OCXO. Rick Karlquist N6RK ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] World's most accurate PC clock!

Slightly OT: Does anyone know if there is an atomic clock (the WWVB driven type) that interfaces to a PC via USB or something, such that the PC time is regularly updated? This would solve my PC time problem. (I need this to work w/o internet access). Rick Karlquist Poul-Henning Kamp said

RE: [time-nuts] Symmetricom 5071A

CBTs have never been outsourced. Rick Karlquist ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

RE: [time-nuts] Warning: HP oscillators on eBay from todoelmondo(Ray Mahoney)

. Rick Karlquist RD Engineer at HP Santa Clara Division 1979-1998 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

RE: [time-nuts] Difference between HP 5370A and 5370B

with GP-IB. It might have actually worked correctly. I remember that the HP5183 had a bug where it would go into serial poll by mistake after about 12 hours of continuous bus activity. There was no way to fix this bug, AFAIK. Rick Karlquist [EMAIL PROTECTED] said: Hi David, Apparently

RE: [time-nuts] connections for HP 10811A ?

it was in response to many customer phone calls about manuals. Rick Karlquist N6RK (employed by Agilent Technologies) ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

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