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

[Paul Alfille]

Shouldn't the outer oven be cooler than the inner oven except during
warmup? I would think the inner electronics would be generating heat.

Paul Alfille K1PHA

On Thu, Feb 11, 2021 at 9:30 PM paul swed <paulswedb at gmail.com> wrote:

> 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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