[time-nuts] Hand Held GPS
paul at greenrover.demon.co.uk
paul at greenrover.demon.co.uk
Mon Mar 30 06:18:22 UTC 2009
bg at lysator.liu.se wrote:
>
> I would check the antenna types to be tested at home with a new Garmin to
> see if the antennas work with below spec DC voltage.
>
Hi Bjorn, thats a good suggestion and as a test I just tried my TomTom
vehicle unit which supplies just fractionally over 3v at the antenna
connector. When attached to my two fixed antennas here, a Motorola and
a Garmin, both 5V antennas worked fine.
I'll run up to a local site with a long feeder run and re test
>
> Perhaps a bias-T and a small chargeable batterypack can give the right
> antenna voltage?
>
That's also a good move and could also implement a little diagnostics
capability by monitoring the volts/current, but if a standard gps will
do the go /no go test its less to carry (and break) in the field.
Again, thanks.
--
73 de Paul GW8IZR IO73TI
http://www.gw8izr.com
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