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Refugee · 7th Nov 2019, 12:29 am

The whistle would most likely sound like a professional solar panel array.
We have some a mile or so away and they sound like 7 to 10 KHZ with 100 HZ over it.

7th Nov 2019, 12:29 am	#17
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: AVO Meter, frequency response. The whistle would most likely sound like a professional solar panel array. We have some a mile or so away and they sound like 7 to 10 KHZ with 100 HZ over it.