Connection of the KENWOOD TS440S to a DATA terminal such as a Kantronics ~~~~~~~~~~~~~~~~~ KAM using the rear ACC2 13 pin jack.~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ____ 4 3 2 1 GROUND ___ | |____ 8 7 6 5 | |___ 12 11 10 9____________ / | MIC ____________/ 13 | | | | | \_/ \_/ ===== ===== | | |___________________| | | | | PTT Pins | Application ----------------------- 3 Data output - not used as the level is very low. The preferred connection is via the speaker output. This also allows fine adjustment of level to enable best decoding. (A switch on the speaker to 'mute' it when required is a good idea.) 4 Ground - you may have to experiment with these connections to 8 eliminate RF feedback and noise. 12 Here they are all strapped. 9 Mic mute - prevents audio pickup from the mic when earthed. By connecting to the PTT line as shown through a diode it automatically MUTES the mic when using data. When the front panel PTT or MIC PTT are used the microphone is 'live'. 13 Standby - PTT which when taken to ground puts the set 'on air'. By connecting through a diode as shown it doesn't affect the PTT operation but allows auto mic muting. The diodes used can be virtually anything, here they are IN4148. The INPUT audio to pin 11 must be quite a high level. If using a KAM you are certainly going to have to change the HF LEVEL JUMPER in the KAM. The level of the KAM as shipped suits connection to the FRONT PANEL MIC but not the rear connector, you can, however, correct this with the jumper. People using the PK232 have complained of NO TX AUDIO, I suspect the level is so low that only local minitoring will show a level present. 73 Richard G4NAD SysOp @ GB7DAD (Downloaded from GB7SYP)