"Mike" wrote in message
...
The owners and regular readers of this newsgroup should by now know my
dislike for the above vermin and will be very interested to know that a
Cat
and Dog Repeller we have just put into use, seems to be working very well.

Called the Cat and Dog Repelleer, it works off 2 x 9 volt batteries and is
a
small and very portable unit and is easy to hide. It is made by STV
International Ltd 2002 at Little Cressingham in Norfolk

Gives a pulse of ultrasonic wave at a frequency range of 18k.hertz to 24
k.hertz, the lower part of the spectrum 'just' being audible.
One neighbour had one; just audible like tinnitus. However never seemed to
bother another neighbours cats near the source. May be just coincidence but
something has struck a cord (sorry), since the noise has stopped I have
noticed a much bigger variety of birds in garden.