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
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
> 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
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
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
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.
--
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,