[Amps] Amps Digest, Vol 146, Issue 13

[Randy]

On 2/7/2015 12:00 PM, amps-request at 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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