I understand how a Foster Seeley discriminator works, but in this Ratio detector, which is a modified version of the former, I don't understand the purpose of having three transformer windings, or having a diode in reverse (why would you want a diode reversed if it can't pass any signal?) or how the signal flows through it.
I also don't understand the purpose of C5, but I understand there's a dynamic filtering function going on (how?)
And lastly, since I don't understand the purpose of three windings, I don't understand the purpose of R3, C6, R5, C7 and C8.
Can someone explain the whole circuit?