I wass fooled by this too. My analog scope does not sync on athe1Hz pulse. You have to breadboard something that will detect it, maybe a flip flop and then look at the FF's output.
On Mon, Jul 23, 2012 at 9:49 AM, Azelio Boriani <[email protected]> wrote: > ...And don't forget that the PPS pulse is very narrow so you have to use a > 'scope with memory, a digital 'scope or turn the brightness at max. > > On Mon, Jul 23, 2012 at 6:31 PM, jmfranke <[email protected]> wrote: > >> Do not be too quick to toss out the antennas. Some receivers need the >> antenna power to be connected to a pin on the receiver connector that is >> then internally routed to the antenna. >> >> John WA4WDL >> >> -------------------------------------------------- >> From: "Stephen Farthing" <[email protected]> >> Sent: Monday, July 23, 2012 12:11 PM >> To: <[email protected]> >> Subject: [time-nuts] Trimble T Lassen 2 - >> suitableantenna....advice.....questions >> >> >> Hi Guys, >>> >>> I have a couple of Trimble T Lassen 2 boards I bought at a Hamfest - >>> the guy told me they were left over from a contract he had and were >>> brand new. He had a load and i bought a couple for use as a precision >>> 1 PPS output for radio stuff. They were packed in static protection. >>> When I apply power to both units I can hear the oscillator (12.504 >>> MHz) on my comms RX. So I am assuming that they work. >>> >>> I bought what claims to be a Trimble compatible active antenna on >>> EBay. I hooked it up to one of the boards and applied power, and put >>> the scope on the one pps pin. However after 20 mins (which I assume is >>> much longer than the unit requires to get a lock) I see no 1pps trace >>> on the screen. :-( >>> >>> So my working assumption is that the antenna is not working. The >>> antenna position is fine as my elderly Garmin GPS2 which must be 12 >>> years old sees 6 satellites there. >>> >>> Can anyone recommend a suitable antenna? I have a number of DIY >>> designs I can try (Patch, Turnstile) but the Trimble docs say it needs >>> an active antenna so I guess I'll have to spend money :-( >>> >>> While i am on, can anyone suggest a reasonably priced unit that has a >>> 1pps output, NMEA and a built in antenna. Because I want to use this >>> with an 8 bit embedded system I am probably not going to be able to >>> hack one of the many cheap USB dongle GPS's. >>> >>> Lastly, has anyone found a GPS that will work with an Ipad. What the >>> man in the Apple shop failed to tell me was the non 3g model lacked >>> the built in GPS :-( >>> >>> Thanks in advice.... >>> >>> Steve >>> >>> >>> >>> -- >>> Wisdom demands a new orientation of science and technology towards the >>> organic, the gentle, the non-violent, the elegant and beautiful. E. F. >>> Schumacher >>> >>> _______________________________________________ >>> 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. -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
