[time-nuts] AN/URQ-13 FE-15a oscillator question

[paul swed]

50C is what I have sort of seen over the years. Just wondered could there
have been a lower temp version. That made no sense. But then this beast has
never made a lot of sense. The $20 mystery from Frequency Electronics.
Thanks Bob
Paul
WB8TSL

On Thu, Feb 11, 2021 at 8:08 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> Even for an outer oven, anything below 60C / 140F would be low enough to
> run into significant problems. On a mil device, an upper end temperature
> on
> the equipment likely would be over 70C. The outer oven would need to be
> 5 to 10C above that.
>
> Bob
>
> > On Feb 11, 2021, at 5:55 PM, paul swed <paulswedb at gmail.com> wrote:
> >
> > OK I have had several responses and 110F is low as I expected.
> > Wonder if I am being faked out? Perhaps by an inner oven and I am only
> > reading the outside of the outer oven. The Older URQ10 and newer URQ23 do
> > have 2 ovens. The meter switch for test is only labeled 1-9. no other
> clues
> > to the function. I noticed 2 positions change with warm up. Sort of
> > supports the 2 oven theory.
> > Really do not want to take what might be the outer oven off to put the
> > probe in.
> > Thanks everyone.
> > Paul
> > WB8TSL
> >
> > On Thu, Feb 11, 2021 at 5:32 PM Bob kb8tq <kb8tq at n1k.org> wrote:
> >
> >> Hi
> >>
> >> 110 F makes very little sense unless you are in a very cold climate.
> >> For military gear (or any gear for that matter) 43C on the oven just
> >> doesn’t work.
> >>
> >> 110 C would make sense in a very high temperature environment.
> >> (think of 85C upper end ….).
> >>
> >> Bob
> >>
> >>> On Feb 11, 2021, at 2:18 PM, paul swed <paulswedb at gmail.com> wrote:
> >>>
> >>> Hello to the group.
> >>> I have had a AN/URQ-13 or FE-15a oven oscillator for years.
> >>> Its never worked correctly and in reality some early alpha build.
> (Funny
> >>> that its labeled 15a)
> >>> Looking online there is no documentation that I have been able to find
> >> over
> >>> the years.
> >>> However in another discussion on a AN/URQ-23 that does have a manual
> and
> >>> schematics I realized my guesses on power could be totally wrong. Using
> >>> voltages like the URQ23 the URQ13 actually behaves fairly well. I was
> >> lucky
> >>> that I didn't destroy something with my original guess.
> >>> That said what I find odd is the internal crystal oven runs at exactly
> >> 110
> >>> degrees. Its repeatably warms to that level with a range of supply from
> >> +/-
> >>> 12-15V.
> >>> Does 110 degrees F make any sense at all?
> >>> Thank you
> >>> Paul
> >>> WB8TSL
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