Some of these systems, properly engineered in a
point-to-point configuration using fixed, gain
antennas (Yagis) mounted on masts/building roof
tops are capable of appreciable range.

It is also a matter of terrain and man made obstacles
as well.

The bottom line is, you won't get 20 miles between
units with unity-gain back-of-the-set antennas - but
equipped with yagis at 50' at each end with no
mountains in between - 20 miles could be expected ...

Jim



----- Original Message -----
From: "Dave Vanee" <dvanee@MECH.UBC.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, September 20, 2001 12:44 PM
Subject: Re: [PIC]: Buffering/Bypassing RS232 handshaking


> The (very little) documentation I have says the range depends on the type
> of antenna and terrain.  That much is quite obvious, but I agree that 35
> does seem a bit much.  The company's website (www.worldwireless.com) no
> longer mentions the 900 SS Direct (only the Hopper and uHopper).  The
> systems currently offered are rated at 40km(~24m) and 500m.  These numbers
> may be slightly more reasonable, but the 24 is still pretty far.
>
> Dave
>
> On Thu, 20 Sep 2001, Sean H. Breheny wrote:
>
> > Hi Dave,
> >
> > Wow, I wonder how they can claim 35+ miles, since that is way over the
> > horizon unless you have got some serious altitude.
> >
> > Sean
> >
> > At 08:32 PM 9/19/01 -0700, you wrote:
> > >I'm not sure if the modem uses the handshaking to determine R/Tx
changeover.
> > >The PC software will just be the datalogger client software.  I'm using
a
> > >World Wireless Communications 900 SS Direct system.  It is rated at 35+
> > >miles, 4800/9600 bps.
> > >
> > >Dave
> >
> > ---------------------------------------------------------------
> > NetZero Platinum
> > Only $9.95 per month!
> > Sign up in September to win one of 30 Hawaiian Vacations for 2!
> > http://my.netzero.net/s/signup?r=platinum&refcd=PT97
> >
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