Noise Burst #bitx40

jah12@...
 

Any simple cure for the noise burst when you key the mic? There is a burst of noise from the speaker as well as a transmitted noise burst.
I see some suggest that the audio preampĀ  Q16 stays active after change-over to transmit due to residual charge in the supply line filter capacitor.
Maybe there needs to be some sequencing of the Tx/Rx change over relays so the audio and antenna relay switches before the Tx/Rx power supply relay.
Any suggestions?
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John VK6JAH

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