[geeks] Synchronus Serial

[Ken Hansen]

2.4 GHz is also unlicensed - think 802.11b/Bluetooth/Gigaphone...

Ken
----- Original Message -----
From: "James Sharp" <jsharp at psychoses.org>
To: <geeks at sunhelp.org>
Sent: Tuesday, July 31, 2001 11:01 PM
Subject: Re: [geeks] Synchronus Serial


> > On Tue, Jul 31, 2001 at 09:32:24PM -0400, Ken Hansen wrote:
> > > 3-400 mines is a *huge* distance in radio terms...
> >
> > hmmmm.  what is a "reasonable" distance to be able to expect nice
performance? LOS?
>
> Depends on terrain and outside interference.  In a nice flat terrain with
> a moderate sized tower (50 feet or so) you can get about 30 or 40 miles at
> 11mbps on 900Mhz.  In hilly terrain or lots of buildings, you're pretty
> much screwed.
>
> >
> > > VHF/UHF require line-of-sight - hard at that distance to be sure.
> > they do?  i didn't think so.  i could very well be wrong though. :)
>
> Yes.  UHF moreso than VHF.
>
> >
> > > HF would limit speed of data (bandwidth concerns) I suspect...
> >
> > what is the theoretical upper limit?
> >
>
> There's no "theoretical upper limit"...its when you start pissing off the
> FCC by having a 36Mhz wide 45mpbs carrier that splatters all over HF that
> you have to get worried.
>
> Thats why all the high bandwidth stuff is at 900mhz and up...usually up
> around 2.4Ghz or 10Ghz.
>
>
> _______________________________________________
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