Since several of you have mentioned the 10811, or how
the 10544 differs from the 10811, you will find the original
HP Journal article about the 10811 very informative. See
pages 20 to 29.
http://www.hparchive.com/Journals/Low-Resolution/HPJ-1981-03-Low-Resolution.pdf
(4.5 MB)
http://www.hparchiv
007 11:08 AM
Subject: Re: [time-nuts] HP10544a Technical Info needed - Filtering
withsingle power source
> Bruce (or anyone really)...
>
> I was comparing that schematic for the 10544A with the schematic in the
> 10811 manual. The 10811 has no mention of the inductor/cap combo, so I'm
Bruce (or anyone really)...
I was comparing that schematic for the 10544A with the schematic in the
10811 manual. The 10811 has no mention of the inductor/cap combo, so I'm
guessing it is not needed when using a single power source?
Jason
> Attached GIf file depicts the recommended power supply
Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Dr Bruce Griffiths
Sent: Saturday, February 03, 2007 11:38 AM
To: [EMAIL PROTECTED]; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] HP10544a Technical Info needed
Les
Lester Veenstra M0YCM
Les
Lester Veenstra M0YCM wrote:
> Excellent, Thanks
> Les
>
> Lester B Veenstra
> M0YCM K1YCM K1YCM/6Y5
>
> Mail Address:
>
> Lester Veenstra
> PSC 45 Box 781
> APO AE 09468
>
> Telephones:
>
> Office 940-6456
> Office +44-(0)1423-846-385
> Home: +44-(0)1943-880-96
Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Dr Bruce Griffiths
Sent: Saturday, February 03, 2007 10:35 AM
To: [EMAIL PROTECTED]; Discussion of precise time and frequency
measurement
Subject: Re: [time-nuts] HP10544a Technical Info needed
Lester Veenstra M0YCM wrote
Lester Veenstra M0YCM wrote:
> I have a bad 10544 (received from AST) that I am planning to look into.
> No 10 MHz out and very low 12 VDC current.
> Has anyone the translation from HP PN to Commercial equiv for the
> semiconductors ?
> Thanks
> Les
>
> Lester B Veenstra
> M0YCM K1YCM
Lester Veenstra M0YCM wrote:
> I have a bad 10544 (received from AST) that I am planning to look into.
> No 10 MHz out and very low 12 VDC current.
> Has anyone the translation from HP PN to Commercial equiv for the
> semiconductors ?
> Thanks
> Les
>
> Lester B Veenstra
> M0YCM K1YCM
CORRECTION
Judging from the oscillator and oven controller voltage ranges Tom's
scanned circuit is actually for the later production models of the
10544A with the improved phase noise specification. The input signal to
the oscillator buffer cascode was probably somewhat smaller than 76mV
rms i
: Saturday, February 03, 2007 4:11 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP10544a Technical Info needed
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
Wonder where you got that one ;-)
http://www.leaps
Gerald Molenkamp wrote:
> Hi Bruce,
>
> You are right. I havn't checked my unit against the schematic at all. It is
> well secured calibrated and operating in my HP 5342 operating well within
> the specifications. The scanned schematic came from Leapsecond a few years
> ago, and I have not had t
Howard
Attached GIf file depicts the recommended power supply filtering when
the oven circuit shares the same supply as the oscillator.
Bruce
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Gerald
Its about 30 years since I had one of these apart for (sucessful) repair
without the aid of any circuit diagram.
At least one can calculate that the nominal crystal current is about 240
uA rms somewhat less than the 1mA in the 10811 with its SC cut crystal.
Bruce
Gerald Molenkamp wrote:
pe it stays that way.
Cheers
Gerald
- Original Message -
From: "Dr Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Saturday, February 03, 2007 3:01 PM
Subject: Re: [time-nuts] HP10544a Technical Info needed
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
Wonder where you got that one ;-)
http://www.leapsecond.com/museum/10544/
I scanned and posted that in 2001; but didn't check the
manual against an actual 10544 oscillator. Should be
close enough for a repa
Gerald Molenkamp wrote:
> Hi Howard,
>
> Please find attached a schematic of the 10544, hope it helps in anyway.
>
> Regards
>
>
>
> Gerald
>
Gerald
The connection of the 10K oven monitor resistor R12 in the schematic is
incorrect.
In this position only the very small deviations in the oven suppl
Howard
I also have the July 1975, July 1976 10544A datasheets.
The phase noise floor specification is about 15dB lower in these later
datasheets.
The oven controller switching noise decoupling circuits were elaborated
to include a 10mH > 0.75A inductor and a 200uf capacitor for filtring
the ove
Howard W. Ashcraft wrote:
> I am constructing a GPS disciplined OCXO using an HP10544a. If someone
> has a copy of the HP manual/technical data for this oscillator, I would
> appreciate getting a scan. I have already received, from a request on
> the HP equipment listserv, a copy of an HP10544 sc
I am constructing a GPS disciplined OCXO using an HP10544a. If someone
has a copy of the HP manual/technical data for this oscillator, I would
appreciate getting a scan. I have already received, from a request on
the HP equipment listserv, a copy of an HP10544 schematic.
Also, while performing t
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