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Old 9th May 2021, 1:19 pm   #7
Terry_VK5TM
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Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
Default Re: Frequency counter and CTCSS decoder.

OK, learn something new every day.

Here is something I found on the net https://k3jls.net/sniffer.jpg, called the Sniffer, not exactly what you are looking for, but, if you used an FM radio (for the band of interest) and the input stage in the diagram connected to a frequency counter, it might work.

Full description here https://k3jls.net/auto_ctcss.html
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