It's a pain to capture on any scope, but really easy to see with an LED across the output. it's not bright, but definitely easy to see on my tbolt.
-Bob On Mon, Jul 23, 2012 at 10:11 AM, Stephen Farthing <squir...@gmail.com> wrote: > 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 -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ 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.