Should be available soon - an all mode talkback circuit was added to the radio.
They've modified an echo mike to enable the echo/talkback - if you use a standard mike it's not enabled and functions as normal.
The new circuit also should allow the "resistor, ext jack to ground" mod if you don't want to buy the new 257 echo mike but want to manually enable the talkback.
YouTube - cbradiomagazine's Channel
They've modified an echo mike to enable the echo/talkback - if you use a standard mike it's not enabled and functions as normal.
The new circuit also should allow the "resistor, ext jack to ground" mod if you don't want to buy the new 257 echo mike but want to manually enable the talkback.
YouTube - cbradiomagazine's Channel