[time-nuts] Trimble T Lassen 2 - suitableantenna....advice.....questions

Azelio Boriani azelio.boriani at screen.it
Mon Jul 23 16:49:33 UTC 2012


...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 <jmfranke at cox.net> 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" <squirrox at gmail.com>
> Sent: Monday, July 23, 2012 12:11 PM
> To: <time-nuts at 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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>>
>
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