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'[EE]: Wireless tel line for 50 mts'
2000\08\25@002413 by Javier Grijalba

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Hi
I want to connect to a tel line, without any wires for just 50 mts, any hints or web pages that describe similar projects ??
What should I use RF, infrared, laser ?¿? Whats  the max bps I can achieve with each solution ?
Thanks
Javier

{Original Message removed}

2000\08\25@082513 by mike

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On Fri, 25 Aug 2000 00:51:10 -0300, you wrote:

>Hi
>I want to connect to a tel line, without any wires for just 50 mts, any hints or web pages that describe similar projects ??
>What should I use RF, infrared, laser ?¿?
>Whats  the max bps I can achieve with each solution ?
>Thanks
>Javier
A standard cordless phone would probably do the job - may need to use
a directional antenna to guarantee the range.

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2000\08\25@200345 by Mark Willis

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Mike Harrison wrote:
> On Fri, 25 Aug 2000 00:51:10 -0300, you wrote:
>
> >Hi
> >I want to connect to a tel line, without any wires for just 50 mts, any hints or web pages that describe similar projects ??
> >What should I use RF, infrared, laser ???
> >Whats  the max bps I can achieve with each solution ?
> >Thanks
> >Javier
> A standard cordless phone would probably do the job - may need to use
> a directional antenna to guarantee the range.

If you can put in wires, I've used RS-232 and/or RS-422 over "way over
spec" distances with really good success a number of times (industrial
controllers where there just wasn't another way at the time to do the
job.  Use GOOD cable and THINK. <G>)  Current Loop is cheap and even
longer range, though slowish for very long distances.  Black Box at
http://www.blackbox.com/ has all kinds of such stuff.  So do "the usual
suspects".

(Is X-10 style, AC power data transmission possible?  Sounds like it
isn't but thought I would ask.)

Quick solution if you already have a modem: You might take a look at the
Panasonic KX-TCL100-B.  900MHz cordless unit, has a base station and a
portable carry unit;  You plug the modem line off your notebook or
embedded device into the carry unit;  it'll do up to 28.8k modem
connections wirelessly.  50 meters shouldn't be a problem if fairly
clear line of sight (Bought one off eBay, haven't used it yet.)  Uses a
3 "AA" battery pack (Sealed cordless phone type) so could replace that
with 3 NiMH 1300mAh batteries (Tabbed so you can solder to them is
best!) or use external 8V power to keep it topped up, I'd think it lasts
for "a while" in use off the internal batteries as a backup power
source.  A 900MHz "Yagi" antenna wouldn't be too large if you need more
range but 50M isn't hard for these or 2.4GHz cordless phones if the
way's mostly clear.

Some wireless modem goodies at
http://www.wirelessmountain.com/900mhz.html that look rather
interesting;  First time I've seen that site is today, they say up to 19
miles line of sight?!  Up to 19.2kB link.  No experience with it yet.

Alternately, you can do 9600 baud using "keychain" lasers;
Phototransistor at each end, align the lasers to hit the receiving
sensors carefully, and switch the laser on and off to send.  See
http://www.geocities.com/SiliconValley/Lakes/7156/laser.htm.  200 meters
range, probably 100 anyways.

If you want higher baud rates over a laser, it gets "nasty", I'd try
using a modulated regular LED array with some collimation or use
wireless.  (IR LED's would be best, PWM'ed, sure others here have done
that more recently than I.)

I bought another few laser keychains the other day for play <G>  I'll
see if I can get more, unless I post here please don't ask (they ran out
quickly.  I was lucky to get any.  $3 or so apiece was a nice price.)

 Mark

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