[time-nuts] 747 Chronometer

[Bill Hawkins]

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