开云体育

No problem Simon,

Now its good time at Melbourne for a beer or to try another hack on bitx40.

Try this:

1. Power the audio stages directly by connecting 12V line to the junction of R111, R113 and D18.

Now you will hear your own voice during TX and we need to mute it.

2. Take a 2N7000 or similar and connect SOURCE to ground, DRAIN to the top of the volume control (M1/M2).
feed the TX 12V through a 10K or nearby value to the gate.

This should mute the amp during TX.

If this works for you then remove the diode D18!

Caveat: I have not tried it as I am at the coffee farm this week. Itching to get back to my board but it will be Monday next!
While in TX mode some RF might get into the amp stage and be just as annoying.
Then we have to work more on that! A 0.01 across the volume control might fix this if it happens.

Cheers
Raj