I bought a CTCSS kit on ebay. It has not arrived yet. Building/programming one myself should not be a problem, it just takes some time. I want continue with other projects so I took a shortcut.
I will do some experiments with a new 10.7 MHz modulator. The goal is to build a modulator with a higher deviation. I will keep the existing one for FM narrow. The new one will be for FM normal. It is quite difficult to get sufficient deviation and keep the center frequency on 10.7 MHz. Some old Ham radio equipment use the same concept so it is possible.
The xtal IF filter used is 25 KHz wide so I should support FM normal.
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