Hi,

   I recently came across an advertisment for radio transmitters &
receivers
which might interest some users.

A company called Radio-tech in the UK is offering modules from 0.25mW to
10mW designed for data transmission. I haven't tried them myself, perhaps
someone on the list can comment on their usefulness.

The address is:

    Radio-tech limited, Overbridge House, Weald Hall Lane, Epping, Essex.

Phone:

    UK sales   0181-368 8277    International sales +44 1992 57 6107

Web:

    http://www.radio-tech.co.uk/


As usual - I have no connection with the company.

Keith.
==========================================================
Keith Dowsett         "Variables won't; constants aren't."

E-mail: kdowsett@rpms.ac.uk
WWW:    http://kd.rpms.ac.uk/index.html


I've used those modules (0,25mW, 433MHz), with limited success...
They're supposed to make a link at up to 200m, but I only got about 25m,
when using a helical-antenna. When swithing to a whip-antenna (both home
made) I got about 50m though (outside).

I had a problem with the modules, as their BW was about 10KHz, and I was
using a digital encoder/decoder running at about 5KHz. I never made it
working, but used a DTMF-encoder/decoder instead, which worked great.

Radio-tech offers a broad range of modules (418, 433, 170MHz - 10KHz-20KHz
BW - different power-radiation).

-Jacob Blichfeldt

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