In an earlier contribution to this discussion,
dave wrote:

I have one of these gizmos from Maplin that allows you to turn on a
13A socket using a remote control box. It works quite well but the
range is optimistic at 25 yards :-)

Just wondered if there is some simple tweak I can do to up the
xmitter power just a teensie-weensie amount to get a little extra
range?

Xmitter is 435 Mhz and looking inside the box there is a 10 turn coil
antenna. I tried putting a few cm of thin copper wire in and around
it and managed to detune it quite well ;-) (well you never know). I
thought maybe a slight (0.5v?)supply volatge increase may do it but
that'd need an extra battery.

I'm guessing the rx cicuits in each of the 13A sockets is even more
difficult to "improve"? Is fun trying anyway.

ps Please, no warning about the mains - I am aware of that risk,
thanks.

I don't know about extending the range. Somehow they seem to work better
when you *don't* have direct line of sight! One thing guaranteed to stop
them working is to plug two receivers into adjacent sockets in a double
power point. Even though they're on different channels, they need to be
separated by a few feet.
--
Cheers,
Set Square
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