> Orbistar (www.orbistar.com, or, if not working, htd.com) sells the trimble
> mini mag mount antenna for $45(us).  Their orbistar $35 does not work.  In
> fact, this particular GPS has trouble with nearly any and all gps antennas
> not made by trimble - reason being that they have overcurrent/undrecurrent
> circuitry which is triggered by the high initial current of most antennas.
According to their FAQ.
<5mA draw=open/disconnected
<1.5V = short
Must rise above 2.5V within 1 uS after power on or power to
antenna turned off.
Designed for antennas with less than .33uF capacitance.
> TSIP is trimbles internal binary protocol.  I assume it gives one scads of
> information.
TSIP is the only mode that will have correct time/date after the
rollover this month. I think it will not be right until October.
> NMEA is the standard for positioning, and is accepted by most mapping
> programs for the PC and other computers.
>
> TAIP is a text based positioning protocol meant for radio transmissions.
>
> It depends on your application as to what you should use.
>
> -Adam
>
> ryan pogge wrote:
> >
> > anyone find a good cheep antena to use with it yet?
> > also, I have found all the upgrade software for it, what
> > is the advantage or disadvantage of each protol?
> > thanks
> > _Ryan
> >
> > > Hook it up directly.
> > >
> > > -Adam
> > >
> > > "John A. Craft" wrote:
> > > >
> > > > I got one of the aforementioned BGMicro Trimble GPS receivers.  The
> > > > documentation indicates the serial ports being "TTL Level", Using
> > > > one of the MAX chips it talks to the computer just fine.
> > > >
> > > > If I want to talk to the USART port of a 16C63, what's needed?  Can
> > > > I
> > hook
> > > > directly?  Seems strange to hook a MAX to the pic and a MAX to the
> > GPS.....
> > > >
> > > > John C.
> > >
>