[time-nuts] HP 10811 update

[paul swed]

I can hope
I will embed a k thermocouple also.


On Wed, Jul 24, 2013 at 7:45 PM, Bob Camp <lists at 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 45 Hz.
>
> Bob
>
> On Jul 24, 2013, at 9:00 AM, paul swed <paulswedb at gmail.com> wrote:
>
> > 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
> > and is at 5.27V thats pretty significant. The transistor looks like a
> > shorted collector base junction. Though I do not have it out of circuit
> > yet. Its Q4 a 2n6429. What interesting about this transistor is its beta
> at
> > 1 ma is 500 min and max is 1300. Its not a darlington. Thats pretty
> > amazing. I am looking through my xsistors to find something close. May
> just
> > through a 2n3904 in for a quick test. Its beta is nothing like the 6429.
> > But it would help to prove/disprove the point that the low V may be
> > offsetting the oscillator I hope.
> > Will also embed a K thermal couple to verify the oven really is in the
> > 80-84C region.
> > Regards
> > Paul.
> > WB8TSL
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