"Dave Liquorice" wrote in message ill.com...
On Wed, 5 May 2004 16:32:57 +0100, nick smith wrote:

Why not a wireless doorbell ? - I am sure I saw one in B and Q the
other day with a claimed range of up to 200 Mtrs !

Operative word "claimed". As with all things RF the location and what
is inbetween the Tx and Rx is critical. If there is nothing but air
range and both the Tx and Rx are a few tens of feet above the ground
then you'll probably find they work far further than quoted. But bung
the Rx in a basement and the Tx the otherside of several walls and it
might not work at all.

Thanks to all for your replies. I am pursuing a Friedland wireless
chime which has the benefit of differing tones for "front & rear door"
& can use a number of senders. In other words, #1 for my real front
door,#2 for next door. Your comments about range have been taken on
board & I'm going for one which has a 200m range (in open air). Thks
again.
Roy