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

[Bob kb8tq]

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
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at lists.febo.com
>>> To unsubscribe, go to
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>>> and follow the instructions there.
>> 
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
>> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.