Kenwood_IF-10D_sch.pdf

10 10 10 10 10 10 10K10K 10K10K RTS fm Radio TXD fm Radio CTS to Radio RXD to Radio CTS to Computer RXD to Computer RTS fm Computer TXD fm Computer +5 +5 +5 +5 1 3 5 9 6 8 2 4 10 uH 10 uH Kenwood TS-50 HF Transceiver Computer InterfaceIF-10D module for This is the entire circuit of the (expensive and now-discontinued) Kenwood IF-10D interface for the TS-50 transceiver. It inverts TTL-level data from the radios digital control board to the “half-RS232” output seen at the 5-pin DIN computer-control connector of other Kenwood transceivers. The four inverters are 4/6ths of a 74LS04 TTL hex inverter. The device is packaged in a metal box with the same 5-pin DIN connector seen on the rear panels of larger Kenwood radios. A 7” pigtail with a 6-contact high-density miniature connector mates with the radio motherboard through a hole on the underside of the TS50. Although Kenwood recommends that you then use their IF-232 interface to convert from 0V/+5 V to true -12V/+12V RS-232 levels, most PC serial ports will work with this interface as-is. The main advantage of the IF-232 is ground isolation - their interface incorporates opto-isolators. Stephen H. Smithwa8lmf 4 December 2003