Bulletin:  SB520
Vendor:    Kenwood TM-741
Subject:   Automatic transmitter key with depressing DTMF key.

To make the transmitter automatically transmit when a TT key is depressed,
find pin 11 on the encoder IC. There isn't any connection to this pin. It
will be the second pin from the left near the mike cord. Connect the anode of
a 1N914 diode to this pin and connect the cathode of the diode to jumper "J1"
or it may be labelled "JU1". Just by pushing the keys now the unit will start
to transmit with no requirement to push the PTT button!