On 2/7/2015 12:00 PM, amps-request@contesting.com wrote:
Message: 3
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
For whatever reason, people that has asthma as children have enhanced
ability to hear "ultrasonic" sounds.
I didn't have it, but even at 55 years of age, I can still hear CRT
sweep oscillators.
73
Randy
KZ4RV
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