...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.
