This is by far the longest-range UHF link ever described in SILICON CHIP - over 1km according to Oatley
Electronics (the project's developers). It's also by far the easiest to build,
thanks to pre-built UHF transmitter and receiver modules.
There are lots of things you could use this 433MHz UHF remote
control unit for. Both the transmitter and receiver are smaller than a match
box, making it suitable as a hand-held remote control for alarm systems, garage
doors and electric door strikers. It can also be used for controlling pumps and
gates (eg, on a small farm) and for remote data collection.
It all depends on the circuitry you "hang off" the four outputs
on the receiver PC board.
A feature of the transmitter is its four separate pushbutton
switches --one for each channel. However, depending on your application, these
could be removed and replaced with a cable carrying data from a PC or some other
device capable of generating 5V logic signals.
Note too that the transmitter will accept single or
simultaneous button presses, or even BCD data. So, by connecting a suitable
decoding chip to the receiver, you could control up to 16 separate outputs. For
example, you could use a 4514 4-to-16 line decoder for controlling up to 16
outputs or a 4028 BCD-to-decimal decoder for controlling up to 10
outputs.
