I have two A16 radios and two HM-240 speakermikes and I cannot get the speakermike's audio to be transmitted.

Pressing the speakermike's PTT does send the carrier but not the mike's audio.

I have set the A16's sidetone setting to 0, as I did on my A14 radio, to prevent feedback when using the speaker-microphone but that does not allow the mike's audio to be sent.

Is there some other setting or anything else I need to do?

Thank you.