TNC2/DCD line (V24). Hello PTM users, If you want to use PTM 5.16 with a TNC2 (from DL ...Eisch, Systek, Landholt) or a TNC with no DCD line. You need to perform a slight modification: Components: 1 transistor PNP : BC 327 or 2N2905 or 2N3906 2 resistors 10K 1/4 watt - connect the BASE through a 10k R to PIN 4 of a LS14 ic or PIN 6 of a LS14 ic (depending if you need a high state or low state) - connect COLLECTOR to -12V pin 5 of MAX232 ic through a 10K R. - connect COLLECTOR to pin 8 of the DB25(RS232) of the TNC2 - connect EMITTER to a +5V source (pin 16 of MAX232). It works . This mod is also needed for TPK (french software). MANY MANY THANKS to : OZ4ZK (author of PTM 5.16) ON5ZS ("the" belgian TNC2 expert) ON6KY (who tipped me on the BC327). Ham radio is a matter of mutual help ..... Best 73's Eric ON7LE/KA3WII ON7LE @ ON7RC.BT.BEL.EU