Re: [time-nuts] HP 5065A repair...

2017-07-30 Thread Pete Lancashire
That's great. Another old HP box brought back to life. -pete On Sun, Jul 30, 2017 at 4:24 PM, paul swed wrote: > Ulf very good and great to hear. I did look at the clock motor driver and I > believe you can use a ttl flip flop to drive the two transistors just fine. > I

[time-nuts] HP 5065A repair...

2017-07-30 Thread Ulf Kylenfall via time-nuts
After having salvaged an old 5065A that was decomissioned in 1987 due to Rubidium cavity heater short circuit, I have now, several weeks later eventually managed to what I think repair it. Using a GPS-Diciplined HP105A as oscilloscope trigger, the 5MHz O/P is absolutely still. "Continous

Re: [time-nuts] HP 5065A repair

2016-03-14 Thread Bob Camp
> have tested GPS modules and GPSDO´s just out of curiosity. In hold mode it > have been useful to get the ADEV out to say 1 secs (low ^-13). > > Lars > > Från: Bob Camp<mailto:kb...@n1k.org> > Skickat: den 14 mars 2016 02:01 > Till: Discussion of precise time and

Re: [time-nuts] HP 5065A repair

2016-03-14 Thread Lars Walenius
quency measurement<mailto:time-nuts@febo.com> Ämne: Re: [time-nuts] HP 5065A repair Hi Some math: 5x10^-11 over 50C You have 1x10^-13 / C If you have pretty good HVAC you get 2C cycles. On a typical home system, you get 2X that or more. Net is a bump at 2x10^-13 (or more). That assumes n

Re: [time-nuts] HP 5065A repair

2016-03-13 Thread Bob Camp
Hi Some math: 5x10^-11 over 50C You have 1x10^-13 / C If you have pretty good HVAC you get 2C cycles. On a typical home system, you get 2X that or more. Net is a bump at 2x10^-13 (or more). That assumes no hysteresis. (Hint: there always is hysteresis). That assumes you have no rate

Re: [time-nuts] HP 5065A repair

2016-03-13 Thread Poul-Henning Kamp
In message , cdel...@juno.com writes: >As far a tempco goes, unless your lab swings tens of degrees will you >really see it? Well, I do... My air-con is far from optimal, but it clearly makes a very obvious bump in my AVAR plots. --

[time-nuts] HP 5065A repair

2016-03-13 Thread cdelect
I'm changing the topic from best rubidium frequency standard for this post. Most repairs I make to the 5065A run well below $250.00, sometimes as low as $100.00. A "crazy bad" repair might run $400.00 or so but out of over 50 repairs only two needed that level of help. As far a tempco goes,