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Thank you!

I also don't know how does 4-lvl FSK discriminator works, is there a line from receiver SPEAKER output to it? and it done some A/D conversion?

Do all receivers with Speaker OUT could work with 4-lvl FSK discriminator?
Just a line from SP-OUT to 4-lvl FSK discriminator and a power supply are enough?


I sorry for my poor English........
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