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.

18 - 24 kHz doesn't really strike me as 'ultrasonic' as I'd suspect that
many people can hear a fair part of that range. (Although not me anymore.
My hearing is now cut off by about 14 kHz.)

I have Tinnitus as well, sometimes quite bad, but more often than not,
bearable. As far as hearing the unit is concerned, I can hear it and then it
goes quet when I 'assume' it is still working but beyond my hearing range.



So what *is* the best way to get rid of cats?

Well apart from what was done during the War, skin and eat, (they taste like
Rabbit), not a lot unless you cover the garden with netting :-((


I'm fairly new to gardening. Only taken it up with any real level of
acitivity since I took early retirement last May. Enjoying it so far
despite having little real clue what I'm doing. :-)

However two doors down the road we have a 'cat lady'. She has an
ever-changing population of semi-stray cats. Typically around a dozen to
20. The main victims of this are the neighbours in between her and us. But
we also get frequent 'presents' left in the garden. And as I guess you
would expect, as I dig and clear areas and plant things, they *love* the
nice soft ground...

and the owner doesn't give two hoots.
However something I did see yesterday which did please me and if it works
the same for you, you will be delighted. The neighbours cat was in their own
garden, slowly ambling towards the dividing line so I triggered the alarm
myself. Cat stopped, twitched its ears, turned round, dug a hole in 'their
own garden' and did its business

:-)))))


In an area around a small apple tree in the back garden I tried covering
the ground with cocoa mulch. I like the look and smell of this, and it did
seem to put the cats off that area. More recently I worked on a flowbed at
the front of the house, and here the cocoa mulch seemed to stop the
'presents' for a few weeks, but they resumed in the last couple of days.
Is
this, as I suspect, as the smell has gone? The layer of mulch I used at
the
front is much shallower than around the tree if that makes a significant
difference(?)

We tried that cocoa mulch, didn't like the smell and if got a grey fur coat
after a while :-((


If the 'ultrasound' doesn't work, what does? I don't want to have to stand
outside with a machine-gun. Nor do I want to have a dog. Our local garden
center has a pot that you buy some sort of crystals to put in. The smell
allegedly makes the cats go away. Does this sort of thing work? If not,
what?...

Don't know, but a report on here on your findins will be well received by
those who are bothered by the vermin.


BTW does the snake oil also improve the sound of audio systems if you
smear
it on the cables?... :-)

There are no cable to spread anythin on :-(


Jim

Welcome to the newsgroup Jim and take no notice of those who appear to be
the 'owners' of uk.rec.gardening. Its just that they have nothing better to
do than take a swipe at postings they do not like. Anti cats is just one of
the things which bring them out of the woodwork :-(( No doubt they have a
dozen cats themselves, and as cats never leave parcels on their land, they
do not see the problem, but treat it as "Not in my back yard"

--