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" <squir...@gmail.com>
Sent: Monday, July 23, 2012 12:11 PM
To: <time-nuts@febo.com>
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
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