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When pin 4 of the PLL goes low, it pulls pin 7 of IC2 the transmit mixer low through R70 and D12. Also shuts down the transmit-buffer transistor TR9 through R47, and the receiver's IF amplifier transistor TR2 through D18. That's what kills both receive and transmit in an unlocked radio. Just has no effect on the front-panel LED.

73

[QUOTE="nomadradio, post: 658620, member: 22"] When pin 4 of the PLL goes low, it pulls pin 7 of IC2 the transmit mixer low through R70 and D12. Also shuts down the transmit-buffer transistor TR9 through R47, and the receiver's IF amplifier transistor TR2 through D18. That's what kills both receive and transmit in an unlocked radio. Just has no effect on the front-panel LED. 73 [/QUOTE]

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