The MV89 is a beast of an OCXO and uses more power at warm-up than any
other
I know of. But it is spec'ed ~1W for steady state. Which means the
outside of the OCXO should be about hand-warm. If it's too hot, then
the heater circuit is probably broken and running at full-throttle.
If so, I think something is not OK with my MV89. It is probably 110
degrees or so.
Can you show us what _your_ circuit looks like instead of some bad
(literal) screenshot?
Here is my schematic:
http://www.patoka.ca/OCXO/LOGGER/IMG_20171119_155907272.jpg
I did some simple tests for this. In it seems it was OK up to 10Mhz.
But guessing from what you showed, I would say that your amplifier
circuit isn't stable and has some gain peaking at around 10MHz.
There are two ways to proceed: Either optimize your circuit or
simplify it using modern components to the input signal you expect.
The main purpose for this circuit is to protect the MCU input and make
some sine to square conversion.
If you only want to time-stamp input pulses and you can ensure
that those pulses are between 0 and 5V, then I'd use a 74LVC1G34
or 74LVC1G04, depending on whether you want inversion or not
(do not use the 74LVC1G14 as the hysteresis will increase the noise
level)
I was using 74AC04 just because it was readily available in my junk box.
;-)
--
WBW,
V.P.
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