Re: tx pop

Nick VK4PP
 

Hi Again,
Im just looking over this and trying to understand what is happening here, Im still learning all this stuff...

So on TX the fet is activated via the 300K resistor, that causes the audio signal at Pin 7 on U1 to be grounded out, effectivly muting it somewhat, except for the loud CW tone comming via the decrease 1K resistor R253.
When switching back to RX, the Cap holds the mosfet closed for a fraction longer, the diode is to stop the charge feeding back to the TX/RX circuit?

73 VK4PLN

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