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

[paul swed]

Paul
This is Paul to confuse the thread. I always thought the outer was cooler
also. Its becoming clear many things I have learned over the years might be
a bit off. I was thinking of looking at several other references that do
have documentation urq10 and 23. See what the maintenance documents say.
The good thing about military stuff is the manuals tend to have some good
details. Will see.
Paul
WB8TSL

On Thu, Feb 11, 2021 at 10:39 PM Paul Alfille <paul.alfille at gmail.com>
wrote:

> 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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