Quote:
Originally Posted by Cruisin Marine
D4 is turned on via an RFC (L21) etc. on the Receive 9 volt line, that makes it conduct and allows the connection to the to crystal make a path, at the same time that voltage seems to block via L20, and reverse bias D5, I don't know what that feed line is though as the diagram is not inclusive.
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Ah, I see now. Thanks
But I'm a bit confused. If the RX line is not on, shouldn't it be when the crystal is part of the circuit on the right of C50?
Like, when RX line is 9V and makes D4 conduct through L19, it's providing an AC short through D4 and maybe C49 so that the crystal is not part of the circuit to the right of C50