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Subject: how discriminator works in RF Rx circuit?

Date: 09/30/03 at 4:13 PM
Posted by: David Di
E-mail: dd[AT55]bumperboy.com (replace [AT55] with @ to reply)
Message Posted:

Thanks, I'm a new guy in RF field. I found most discriminators have "/\" shape V-F response around Fc which is 455khz. A few of them is "S" shape. I have following questions about discriminator:

1.When degining the circuit, how to make sure it works on only one side of the curve, not the other.

2.For a "/\" curve discriminator, if the IF is exact the same frequency as the Fc of the discriminator, the demodulated voltages of 2 frequency(Fc+3khz,Fc-3khz)should be the same or almost the same. If this is right, how the FSK shaping comparator is going to work?

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