Hi Dabney, Sorry for the silence, I missed your reply. It's impossible to know without full details but I'm not sure that the 10kHz output is that suited to this application. The Jupiter has a 1 Hz update rate. As I understand it the 10kHz is updated at 1Hz which can cause phase jumps. I assume you have optical traps along the course. I'd look at the Trimble Palisade or Accutime units. These have a time-mark input. When this is triggered the unit will output the time with 320ns resolution (Accutime 200). This could then be sent by wireless to the timing control. On the 770MPH + car I had two systems. An electronic one using a reluctance sensor triggered by the brake disk drive dogs. The second one was a pitot driven airspeed indicator. I made the indicator by modifying a Machmeter from an F4 Phantom. The static reference pressure was "stored" in a stainless steel Dewar (OK a Stanley Thermos flask). The official timing was done by Dave Petrali of USAC. That was using traditonal light traps and electroinc timers. Regards, Robert G8RPI.
--- On Tue, 14/12/10, Dabney Crump <[email protected]> wrote: From: Dabney Crump <[email protected]> Subject: Re: [time-nuts] WTB up to 10 pieces - Rockwell Jupiter - TU30-D140 To: "Discussion of precise time and frequency measurement" <[email protected]> Date: Tuesday, 14 December, 2010, 2:56 Hi All, I don't suppose anyone found any of the Jupiter units over the weekend? Thanks - Dabney On 12/13/2010 06:23 PM, paul swed wrote: > Kind of went quite > > On Thu, Dec 9, 2010 at 6:53 PM, Dabney Crump<[email protected]> wrote: > >> Hi Robert, >> Yes, its for the 10kHz output. >> Basically the units will be part of a set of timing computers that will be >> used at >> fixed locations to measure time intervals. >> >> That's very fast, how did you test it at that speed? >> >> Thanks - Dabney >> >> >> On 12/9/2010 3:02 PM, Robert Atkinson wrote: >> >>> Hi Dabney, >>> Why the Jupiter? I assume it's for the 10kHz output, but can't see where >>> that applies to automotive timing. I have a couple of Jupiters and also have >>> an interest in automotive speed events. The fastest speedometer I've >>> designed and built so far did over 770MPH. >>> Regards, >>> Robert G8RPI. >>> >>> --- On Thu, 9/12/10, Dabney Crump<[email protected]> wrote: >>> >>> >>> From: Dabney Crump<[email protected]> >>> Subject: [time-nuts] WTB up to 10 pieces - Rockwell Jupiter - TU30-D140 >>> To: [email protected] >>> Date: Thursday, 9 December, 2010, 21:43 >>> >>> >>> Hi All, >>> I'm looking for approximately 10 of the Jupiter GPS modules >>> for a personal timing project; I time automotive speed events. >>> >>> I'm aware of the units available on eBay from Hong Kong but >>> would like to try to source them from US markets first. >>> >>> Thanks for any assistance, >>> Dabney in Denver >>> 303-324-1084 >>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
