Bob,
Alas, I suspect you've hit the nail on the head. I'll probably wind
up replacing the oscillator with something similar that I can make
work. While I've got some pretty good counters in the racks in my
workshop, the 5300B is a handy little counter to schlep around for
low frequency work. Beside, it's lighter than the rack mounted counters.
Thanks,
Burt, K6OQK
From: Bob Camp <[email protected]>
Hi
If the OCXO was not heating, it would be off by about 20 to 60 Hz.
It's close enough that it is getting power and heating up. If it
does move when you fiddle the trimmer, that part is likely still connected.
It sounds like the beast has simply aged further than it's trim range.
Bob
> On Nov 1, 2014, at 8:39 PM, Burt I. Weiner <[email protected]> wrote:
>
> The closest it will adjust is -2.5 Hz of 10.0000 MHz. This unit
differs from the one in the manual in that it has a Microsonics
OCXO with the adjustment on the side of the module. The oven does
not feel warm but is written on the side is: "Adjust at 25 Deg C",
which is about 77 degrees F. The schematic associated with the
oven is missing from the schematic. I suspect that the oven is
either shot or not getting power. The unit will not power up with
the boards separated so I'm going to have to spend some time
hanging wires out the side to make measurements. Does anyone know
of a schematic showing the Microsonics module and the associated
circuitry for oven control? Not sure if it's worth the effort, but
it would be a shame to toss it - that's against my nature.
>
> Burt, K6OQK
>
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
[email protected]
www.biwa.cc
K6OQK
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