Mark,

I need the modules to be wireless and have a reasonably low current draw in
receive mode.  The reason I need spread spectrum, is that I need a range of
about a mile, and I don't want to have to license each transceiver.  The
baud
rate isn't that important.  19200 would be plenty.

What I have in mind may require 1000+ modules.

So I'm looking for someone who is building these modules for under $100...
or, I'm going to have to get the chipsets and do it myself.

I am interested in your implementation of RS-485 however.  I have another
project where the purpose is to replace a 20mA current loop with something
reasonable.  247 slave units seems like a reasonable maximum in this
application,
and it will be wired.

Regards,

Craig

----------
> From: Mark Lezama <mfidel@TELCEL.NET.VE>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]  Help Finding Reasonably priced Spread Spectrum modules
> Date: Friday, March 06, 1998 5:41 AM
>
>
> I have one but is RS-485/422. the advantages are:
>
> 1.- You can connect 1 master and 32 slave without any repeter or 1
> master and 247 slave with repeters in RS485 mode (half duplex). In
> RS-422 mode (full duplex) you can put 10 slave.
> 2.- It is electrical and optical isolate.
> 3.- The conection is for 4000 ft.
> 4.- PC is connect in RS-232 and the other side is RS-485
> 5.- You dont need RS control.
>
> the disadvantages are:
>
> 1.- You need a long cable.
> 2.- The max baud rate ( I programing ) 19200bps.
>
> Mark Lezama.
>
> Craig Lee escribis:
>
> > I'm looking for some reasonably priced modules I can use for
> > Remote connectivity via a PC and my PIC project.
> >
> > I've found a couple sources, but the modules are $750 each!
> >
> > Anyone knowing of anything less than that, I'll buy you a beer!
> >
> > Craig