[time-nuts] Haydon aircraft clock

[Paul Nelson]

These clocks are generally driven by 24 volts, not AC 400Hz- BUT they 
almost all have an external time base which provides a two-phase 60Hz 
signal. I have several of them, and have been able to find one timebase 
to power em with.... I have some documentation squirreled away and I'll 
look it up this weekend.

Best, Paul

time-nuts-request at febo.com wrote:
>
> Message: 3
> Date: Thu, 21 May 2009 02:51:19 -0500
> From: "Bill Hawkins" <bill at iaxs.net>
> Subject: Re: [time-nuts] 747 Chronometer
> To: "'Discussion of precise time and frequency measurement'"
> 	<time-nuts at febo.com>
> Message-ID: <5D174BD204344F32BBF183EE98579089 at cyrus>
> Content-Type: text/plain;	charset="us-ascii"
>
> Sounds like you need to know more about the instrument power in a 747,
> perhaps starting with Boeing. You could be needing DC or AC in one or
> three phases, more likely at 400 Hz. OTOH, the VCR players for movies
> looked like stock items.
>
> The AC generators in aircraft are not likely to have the accuracy of
> ground-based power distribution, so the clock probably has an internal
> DC supply and a crystal oscillator.
>
> Can you open it up to do any tracing? Have you tried calling A. W.
> Haydon? They've been around for a while.
>
> Bill Hawkins
>
>
> -----Original Message-----
> From: Charles Rushing
> Sent: Thursday, May 21, 2009 1:45 AM
>
> Greetings To All,
>
> Please accept my apologies in advance if this is off-topic.  I have just
> acquired an aircraft clock, which I've tentatively identified as coming from
> a Boeing 747.  It's way cool looking and would make a perfect dust collector
> in my ham shack if I could only power it up.
>
> There is a multi-pin military-style twist-lock connector on the back, but no
> indication of what the pinout may be.  The unit is identified as:
>
> "CLOCK, 3" 24 HOUR GMT ELECTRONIC
>  MFD BY A.W. HAYDON CO. PRODUCTS
>  NO. AMER. PHILIPS CONTROLS CORP.
>  Cheshire, Conn.
>  MFR'S. PT. NO. A15551-P1"
>
> I've searched the Net for technical documentation, but could only find the
> reference to the 747.  Does anyone have any information about these clocks,
> or can someone point me in the right direction?
>
> Many thanks in advance.
>
> Chuck
>
> WA5MUV
>
>   

-- 
Paul Nelson W5GNF              "When I go, I want to go quietly, in my
Ames, Iowa                     sleep, like my grandfather- not 
Senior Engineer (Retired)      screaming, like his passengers."
Sauer-Danfoss Company
(DrHydro at qwest.net)
                               "More hay, Trigger?"
 ex-Cessna 140 N77149 (sigh)   "No thanks, Roy, I'm stuffed."