[time-nuts] AN/URQ-13 update

[paul swed]

Bob could be. No matter it works and I might agree at this point since the
whole oscillator draws 6 ma. Its no buffer amp. Plus the output goes to a
2K resistor to feed the coax.Its been on 12 hours and is fairly stable.
Simply have the unit wrapped in several layers of cloth.
One last thing before re-assembly. The outer oven or in this case the dewar
mouth oven seems odd. Could leave it alone but heck thats not any fun.
If that can be resolved then the unit actually will be operational in some
crazy respect.
There are so many things today that are better, but not as much fun.
Regards
Paul.

On Sun, Feb 28, 2021 at 9:27 AM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> > On Feb 27, 2021, at 9:38 PM, paul swed <paulswedb at gmail.com> wrote:
> >
> > Well some progress actually made. Ripped the oscillator out of the
> assembly
> > and removed the rest of the material surrounding everything. Now have a
> > schematic at least 90% correct. Part of the issue seems to be rotting
> > solder joints. After fixing those the unit appears to be on frequency at
> 5
> > MHz and stable. More reassembly has to happen and hard to say what
> > additional issues will show up. But that is progress in the right
> direction.
> > The actual oscillator is a 2n914 npn transistor in a Pierce
> configuration.
> > The output feeds an IC amplifier. Guessing a differential amp but the
> part
> > number doesn't show up in any search.
>
> In that era, I’d bet it’s some sort of transistor array.
>
> Bob
>
> > Regards
> > Paul
> > WB8TSL
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