Quote:
Originally Posted by Guilly  Fred,
the main problem is the water. It's not the best enviroment for RF transmissions, in fact it's one of the worst cases. Of course, you can always increase the output power, but then you will have a huge battery every WR should carry.
I remember doing some tests with some piezoelectric resonators some time ago. The idea was to develop a handy buzzer. The results were good, but it wasn't loud enough to cover the pool. You could hear it 5/6 meters away.
Maybe I should look at my gadget box, they should be there.
Regards,
Sebastián |
even in 1992 size was an issue/problem. buzzer was size of can of hair spray/large beer/ etc so bulky. quite frankly I don't remember how it was attached to ref hand so that ref could activate it, but it wasn't easily done. but I think the lack of continued interest says how successful and accepted it was. Again it only worked to 1.8 m, and there were, I think, some kind of receivers in corners of the pool. Referee at 2 m had to raise hand up to activate. Someone in NZ must have built it as WC in Wellington - ask Murray? Ray?. No one has tried again in more than 20 years.