[time-nuts] HP 5060A C-field

[paul swed]

Corby it is a 5061a with a 5060 tube in it that has a few Cs leftover.
(Original 004 tube was seriously empty)
Had to create a new oven controller to get to those Cs its temperature is
slightly elevated over what the 5061a could do. I can just see beam current
at maybe .25 of a tick mark above zero.
I looked at the cfield regulator last night and measured its behavior and
as the numbers increase so does the current and I can make the frequency
now go above or below the correct range since adding in a resistor to the
emitter of Q9. It was a short.

However the reality of the systems may be catching up to me.
The 5065 gets aligned to LORAN C when its on for testing and that matches
GPS from a HP 3801 very well. The fact that this drifts one way or another
could actually be telling me what the other references are doing.
Regards
Paul
WB8TSL


On Fri, Jan 3, 2014 at 12:15 PM, <cdelect at juno.com> wrote:

> Paul,
>
> First off, is it a 5060A or 5061A?
>
> More C-field current increases frequency.
>
> You can check the synthesizer frequency, It should be 12.6317716 or
> 12.6317725 Mhz.
>
> Either one is OK as you select the A15 resistor to center the C-field pot
> anyway.
>
> Here is info from an earlier post.
>
>  The zeeman frequency required depends on two things, the magnitude of
> the
> > C-field current and the synthesizer frequency.
> >
> > HP 5061A and B units that have a synthesizer freq. of 12.6317725 Mhz
> are
> > configured for a lower value of C-field current by selecting a higher
> > value series resistor on the A15 board. In this case any tube installed
> > (5061A/B 5060 4050 4060) will operate at the 53.53Khz zeeman frequency.
> >
> > HP 5061A and B units and 5060A units that have a synthesizer frequency
> of
> > 12.6317716 Mhz are configured for a higher C-field current due to a
> lower
> > value series resistor in the C-field circuit. In this case any
> installed
> > tube will operate with a 42.82Khz zeeman frequency.
> >
> > Problems arise when synthesizer and or A15 modules are swapped around
> > indiscriminantly leaving a unit with modules that do not match!
> >
> > Since the HP and FTS tubes C-field windings are designed to provide the
> > same field for a given input they are interchangeable. You can operate
> > any of these tubes at a 42.82 or 53.53Khz zeeman. I usually just stick
> > with how the mainframe came configured.
>
> Corby Dawson
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