Okay, 12V on the oscillator (pin 3) and 20V on the oven (pin 14). How much
on the oven controller, pin 8?
Are pins 2, 4, 5, 9, and 15 grounded? Pin 6 (EFC) should be grounded for
initial testing.
John WA4WDL
--------------------------------------------------
From: "Nick Foster" <[email protected]>
Sent: Friday, January 15, 2010 2:53 PM
To: <[email protected]>
Subject: [time-nuts] HP 10544A with dodgy output?
Hi all,
I've just built a GPS-disciplined oscillator built around a 10544A,
somewhat in the style of the Brooks Shera unit, just to use around the
shack. Problem is, now that it's wired up, I notice the output is heavily
distorted. It's clipped on the negative side of the waveform, like an
emitter follower without enough headroom. The more I load the oscillator
output, the heavier the clipping. When I load the oscillator output with
1000 ohms, spec for this unit, almost 30% of the waveform is clipped on
the negative side. If I don't load it at all and just put a probe on the
output, it looks OK, but still some flattening of the bottom half of the
waveform.
I've got it wired up according to the datasheet, with +12V on the
oscillator and +20V on the heater. The grounds for the
oscillator/amplifier, oven controller, heater, and output are all tied
together.
I know these are old units, and I'm wondering if this is a problem (for
instance in the output emitter follower amp) that others know about,
before I tear into it looking for a solution.
Thanks for your time,
Nick
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