Re: [time-nuts] Z3805 service information ?

Mark Many of us would like those details but they have never crossed time-nuts path as far as I know. There has however been various reverse hacks that are helpful. Basically time-nuts have figure out this and that power supply voltages and such. Gross stuff. Some have ventured down into Forth.

[time-nuts] SFMOMA

Hi: The San Francisco Museum of Modern Art sent an email with the subject "We're Here for You in Your Hour of Need". They have a number of interesting timepieces: http://museumstore.sfmoma.org/timepieces.html Mail_Attachment -- Have Fun, Brooke Clarke http://www.PRC68.com

[time-nuts] Z3805 service information ?

Hi, I realize this is a long shot but I'm curious if anyone has ever come across any form of a service manual (or insight into a power on self test routine) for the Z3805 gpsdo ? One of mine is not working properly after being power cycled. It works well enough to blink the status lights

Re: [time-nuts] HP5065A C-field current is temperature sensitive

j...@febo.com said: > Attached is a frequency plot of my 5065A ... The label at the top says "HP 5334A". Your graph has a resolution of roughly 1E-12. Maybe twice as good. How do you get that from a 5334? I can only get 11 digits. I'm guessing it's tangled up with the "tau0 = 3600", but I

Re: [time-nuts] HP5065A C-field current is temperature sensitive

Hi Chuck, can you give me more info about th PHK's changes to the oven? Luciano On Mon 31/08/15 14:47 , Chuck Harris wrote: > Hi Bob, > > I haven't seen anyone bashing the designer, or the design of the 5065. > What I have seen a couple of enthusiasts that love the

Re: [time-nuts] HP5065A C-field current is temperature sensitive

Hi If you hook up a pps into your 5334 from the GPSDO as the “start” and a pulse from the Rb as the “stop” you will get about 2 ns resolution. Tau zero is the sample time used. 3,600 sec sounds a lot like a sample per hour. If you have a tag each hour your resolution is 2x10^-9 / 3600 = ~6

Re: [time-nuts] HP5065A C-field current is temperature sensitive

In message <16507.1441083...@timeok.it>, tim...@timeok.it writes: >can you give me more info about th PHK's changes to the oven? I have not changed the oven. The only change I will propose so far is this: Measure the voltage over A15CR5 Multiply by 76 Replace

[time-nuts] Subject: Re: HP5065A C-field current is temperature sensitive

Hi, A possible solution might be touse two of the TL431 programmable shut regulators. One to replace the zener diodeand the second to form a simple oven using a thermistor and pot to set thetemp.   See: http://www.techlib.com/electronics/ovenckts.htmand TL431 data sheet for details.   Then