Hi Paul, Glad I didn't say no aircraft clocks use a 60Hz timebase! I wonder if they used a commercial (non-aircraft) movement? The design seems to break the normal aircraft design premise that a single failure should not cause the loss of more than one duplicated system. Unless the clocks have some kind of back-up osvillator loss the the clock source would kill all three clocks. In the UK regulations, clocks sort of slip through a gap. You have to carry one, but it doesn't HAVE to be specifically approved for aircraft use. We used to gent them repaired by a local clockmaker.
Regards, Robert. --- On Fri, 22/5/09, Paul Nelson <drhy...@qwest.net> wrote: > From: Paul Nelson <drhy...@qwest.net> > Subject: Re: time-nuts Digest, Vol 58, Issue 51 > To: time-nuts@febo.com, "Robert Atkinson" <robert8...@yahoo.co.uk>, "Charles > Rushing" <crushin2...@austin.rr.com>, "Bill Hawkins" <b...@iaxs.net> > Date: Friday, 22 May, 2009, 5:28 AM > Well, I found some stuff on this > clock... from a few handwritten notes I made several years > ago, there exist both types; those that have an internal > timebase, and those that require an external timebase. The > clock that I can put my hands on right now is an A15586; I > have a couple more. The timebase is an E13832-P1, and it > consists of a TCXO with an output frequency of 983.040 Hz > and a couple of chips (CD4013 and CD4020) which output a > two-phase square wave signal at 60 Hz to drive the stepper > motor inside the clock. Basic wiring is as follows- there > are usually two connectors on the clock, one of which > matches the connector on the timebase- a 12-pin circular > connector, MS27034H12B12PN. The other, larger, connector is > for the ARINC bus stuff. > > I've had all of mine working with that timebase. > > If your clock has an internal timebase, it should work > simply by powering it with 24v on pins 3 and 4. I don't know > which ones do and which ones don't- there's a whole bunch of > variations. > > Pin Clock > > Time base > 1 5v > lighting > n/c > 2 5v > lighting > n/c > 3 +16to32v > -----------> +16to32v > 4 > -16to32v -----------> > -16to32v > 5 Case gnd > ------------> Case gnd > 6 Ph 1 drive sig > in ---> Ph 1 drive sig out- capt clock > 7 Ph 2 drive sig > in ---> Ph 2 drive sig out- capt clock > 8 > > > Ph 1 drive sig out- F/O clock > 9 > > > Ph 2 drive sig out- F/O clock > 10 > > > Ph 1 drive sig out- F/E clock > 11 > > > Ph 2 drive sig out- F/E clock > 12 > > > spare > > time-nuts-requ...@febo.com > wrote: > > > > Message: 2 > > Date: Thu, 21 May 2009 17:50:33 +0000 (GMT) > > From: Robert Atkinson <robert8...@yahoo.co.uk> > > Subject: Re: [time-nuts] 747 Chronometer > > To: crus...@ieee.org, > Discussion of precise time and frequency > > measurement > <time-nuts@febo.com> > > Message-ID: <240600.56920...@web27104.mail.ukl.yahoo.com> > > Content-Type: text/plain; charset=iso-8859-1 > > > > > > Hi Charles, > > I had a dig, but could only find info on the current > clocks that receive time info on an ARINC 429 serial bus, > and an earlier hybrid LCD / mechanical model that needs an > external 1PPS (I'd like one of those). > > I've never seen an aircraft clock that needed an > external 60Hz signal. Unfortunatly Hayden have been bought > up and no longer list instruments. Keep Googling! > > > > Robert G8RPI > > > > --- On Thu, 21/5/09, Charles Rushing <crushin2...@austin.rr.com> > wrote: > > > > > >> From: Charles Rushing <crushin2...@austin.rr.com> > >> Subject: [time-nuts] 747 Chronometer > >> To: time-nuts@febo.com > >> Date: Thursday, 21 May, 2009, 7:45 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 > (drhy...@qwest.net) > > "More hay, > Trigger?" > ex-Cessna 140 N77149 (sigh) "No thanks, > Roy, I'm stuffed." > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.