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PICList Thread
'Rx/Tx'
1999\10\26@194336 by Tony Nixon

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Does anyone know of a device that can be controlled by a PIC to
send/receive serial data over a radio link with a line of sight range of
about 3KM max? Data integrity is very important.

--
Best regards

Tony

http://www.picnpoke.com
Email spam_OUTsalesTakeThisOuTspampicnpoke.com

1999\10\26@212310 by spamdogg

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Tony

   Now I can return the favor.  A company called Linx Technologies:
http://www.linxtechnologies.com has a transmitter that operates just above 900MHz.
it has eight chanels that can be controlled by a PIC.  It takes in data
serially and can handle up to 50kps data rates.  The only external part
required is an antenna.  There is both a transmitter and a receiver.  They
cost about $28 dollars each.

Scott

Tony Nixon wrote:

{Quote hidden}

1999\10\26@222341 by Brian Kraut

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I have some PICs communicating over a 900MHz wireless link in a camera
control system.  The base station has an omnidirectional whip antenna about
24" tall and the two remote stations have small yagis.  The remotes are
about 1.5 and 2 miles from the base station.  I have temporarily used 6"
rubber duck antennas on the remotes with good results.  The specs for the
modems puts the rage somewhere around 12 miles with yagis at both ends and
3-4 miles with whips.

I am using 1W Hummingbird modems from Xetron.  I think they are at
http://www.xetron.com.  The evaluation models that come with enclosures were
$850.00 each.  Antennas were about $150.00 each.  I have had these up for 2
years with no problems.  The modems can be set up for error correction and
can be set for point to point or multidrop.  They are available in RS232 and
422.  For OEM use you can get them cheaper without the enclosures.

There are cheaper modems available, but these are very good and reliable.

Tony Nixon wrote:

{Quote hidden}

1999\10\27@110139 by Don Hyde

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The company I work for makes very nice 900 MHz spread-spectrum transmitters
and transceivers with a 1 mile range which can be controlled via a serial
link.  They send data using 16- or 32-bit CRC's, and can be programmed to
repeat each transmission.

Contact:
Steve Fant
Axonn Corporation
101 W. Robert E. Lee Blvd. Suite 202
New Orleans, La. 70124
http://www.axonn.com
.....stevefKILLspamspam.....axonn.com

> {Original Message removed}

1999\10\27@120433 by Andres Tarzia

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Check the following links

http://www.convergentinc.com/products.html      $10 modules!

http://www.radiometrix.co.uk/

http://www.rfm.com/             look into Virtual-Wire products

I'm sorry to say that I had not tried any of these products, so you are on
your own.

Regards,
Andres Tarzia
Technology Consultant, SMART S.A.
e-mail: EraseMEatarziaspam_OUTspamTakeThisOuTsmart.com.ar

-----Original Message-----
From: Tony Nixon [Tony.Nixonspamspam_OUTENG.MONASH.EDU.AU]
Sent: Tuesday, October 26, 1999 20:42
To: @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
Subject: Rx/Tx


Does anyone know of a device that can be controlled by a PIC to
send/receive serial data over a radio link with a line of sight range of
about 3KM max? Data integrity is very important.

--
Best regards

Tony

http://www.picnpoke.com
Email KILLspamsalesKILLspamspampicnpoke.com

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