Hi Jim,
I'm glad you've made progress on it. The big old 106B is the
best quartz frequency standard hp ever made. I measured
more than one of them with short-term stability down around
1e-13. Left on for months, drift rate are on par with rubidium.
Some long-term plots of a hp 106b are shown here:
http://www.leapsecond.com/museum/hp106b/
but I see that old page doesn't include any recent short-term
performance plots.
/tvb
----- Original Message -----
From: "Jim Palfreyman" <jim77...@gmail.com>
To: "Stan Searing" <st...@sycard.com>; "Discussion of precise time and frequency
measurement" <time-nuts@febo.com>
Sent: Thursday, July 30, 2009 4:22 PM
Subject: Re: [time-nuts] Service manual for HP 106B Quartz Oscillator
Hi Stan, (and time-nuts because this may interest someone).
Well I've made good progress. The 1000 uF capacitor fixed a lot of things.
After letting the unit warm up for 24 hours it has settled down to become
quite an accurate unit. Current drift (after calibration with a screwdriver)
is 2 nsec a minute. Not bad for an old beast.
I notice the oven has four adjustments. Two marked "factory settings". The
large screw at front and centre is a course oscillator adjustment - but I
don't know the other three. Can you look those up for me. There locations
are:
Rear centre - screw is deep within the unit. No noticeable change. I'm
guessing inner oven temperature.
Rear offset - screw is near the surface. No noticeable change. I'm guessing
outer oven temperature.Seems to adjust the amplitude of the waveform in some
weird way. Not sure of this.
There is also a large internal trim pot near the front top of the unit but
facing backwards. I'd like to know what this does.
Regards,
Jim
2009/7/30 Jim Palfreyman <jim77...@gmail.com>
Hi Stan,
No I've had no luck at all!
How big are the 106B manuals (in pages)?
Is it feasible to get them scanned? I know I could do it - but Australia is
a long way...
I know Didier Judges has an excellent archive of manuals (
http://www.ko4bb.com/manuals.php) and this is not in it. Which is a pity,
because I understand this was a premier unit for its day. I have one and I'm
repairing it. The first dud component I've found is a 1000 uF capacitor in
the power supply. But there may be more.
My first immediate query is what signals/waveform should be on the three
test points at the upper rear of the unit?
Thanks and regards,
Jim
2009/7/30 Stan Searing <st...@sycard.com>
Hi Jim,
Did you find the manual?
I have a op and service manual for the 106A and 106B.
TVB may have already scanned one.
I do want to keep my manual, but could scan sections sometime.
Stan
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: Tuesday, July 28, 2009 7:48 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Service manual for HP 106B Quartz Oscillator
106B.
2009/7/29 J. L. Trantham <jlt...@worldnet.att.net>
> 106B or 105B?
>
> Joe
>
> -----Original Message-----
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
> On Behalf Of Jim Palfreyman
> Sent: Tuesday, July 28, 2009 8:56 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Service manual for HP 106B Quartz Oscillator
>
>
> Does anyone know where I might get hold of one of these manuals? (I've
> looked in the usual places) I have one of these devices and it needs a
> bit of work.
>
> Regards,
>
> Jim
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