Note the early version has a different (tighter) spec for the oscillator
supply and oven controller supply (10.6V-11.7V) than the later version
(11V - 13.5V).
The oven supply spec is also different (15V -30V) rather than (20V-30V).
Bruce Griffiths wrote:
Nick
Nick Foster wrote:
Do you have t
Nick
Nick Foster wrote:
Do you have the serial number of your 10544?
1244A02119
That appears to be the early, higher phase noise version.
The later versions have a 15-20 dB lower phase noise floor.
One clue (apart from the serial number prefix) to this is that the
CA3045 diff
and working now.
Thanks for everyone's help.
Nick
> Date: Sat, 16 Jan 2010 10:39:22 +1300
> From: bruce.griffi...@xtra.co.nz
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] HP 10544A with dodgy output?
>
> Nick
>
> The 10544A had at least 2 variants.
> I have the o
surement"
Sent: Friday, January 15, 2010 4:39 PM
Subject: Re: [time-nuts] HP 10544A with dodgy output?
Nick
The 10544A had at least 2 variants.
I have the originals but the various datasheets are available on Didiers
site.
The earlier versions had a somewhat higher phase noise
ransistor change the schematic is mostly
the same. Do you happen to know for sure?
Thanks,
Nick
Date: Sat, 16 Jan 2010 09:35:03 +1300
From: bruce.griffi...@xtra.co.nz
To: time-nuts@febo.com
Subject: Re: [time-nuts] HP 10544A with dodgy output?
The output of the diode detector is compared w
z
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] HP 10544A with dodgy output?
>
> The output of the diode detector is compared with the dc base voltage of
> the oscillator transistor adjusting the oscillator transitor current
> whenever the detector output deviates from
s@febo.com
Date: Fri, 15 Jan 2010 15:06:42 -0500
Subject: Re: [time-nuts] HP 10544A with dodgy output?
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 te
--n
> From: jmfra...@cox.net
> To: time-nuts@febo.com
> Date: Fri, 15 Jan 2010 15:06:42 -0500
> Subject: Re: [time-nuts] HP 10544A with dodgy output?
>
> Okay, 12V on the oscillator (pin 3) and 20V on the oven (pin 14). How much
> on the oven controller, pin 8?
> A
The 10544A is specified for a 1000 Ohm load.
John WA4WDL
--
From: "David C. Partridge"
Sent: Friday, January 15, 2010 3:11 PM
To: "'Discussion of precise time and frequency measurement'"
Subject: Re: [time-nut
: [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
It sounds like the dc emitter current for the output emitter follower is
too low.
Either that or the emitter follower transistor is faulty.
It is possible to damage the output emitter follower, it happened in one
that I had several decades ago.
Once the output device was replaced the OCXO func
uot;
Sent: Friday, January 15, 2010 2:53 PM
To:
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,
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 emi
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