I used to also be able to hear the 15 kHz sound from TV sweep
oscillators.
... and the 19 KHz stereo pilot tone on FM receivers.
73,
... Joe, W4TV
On 2015-02-06 2:48 PM, Steve London wrote:
When I was a kid, a local department store had some kind of ultrasonic
alarm system that drove me nuts. I used to also be able to hear the 15
kHz sound from TV sweep oscillators.
One of the advantages of growing up is not hearing these any more !
73,
Steve, N2IC
On 02/06/2015 12:14 PM, Mike Waters wrote:
Somebody suggested having a young person listen for a very-high pitched
sound. I think that's a very good idea indeed. Has that been tried yet?
I know a teenage boy that can hear the 'ultrasonic' noise emanating from
most cell phone and tablet screens, and at a considerable distance.
73, Mike
www.w0btu.com
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