Cable connection to KENWOOD portable radios has a specific feature. ![]() It is convenient to use an additional connector to attach particular radio jacks to the programming cable.ĭB9 is recommended as a highly reliable one. Otherwise TxD to RxD interference will result in programming failure. Multiwire cable with low mutual capacitance among wires is also applicable. Cable for RRxD and RTxD connections should be shielded. LP2950 is replaceable with LM2951 with appropriate resistors, 78L05 is the worst choice due to it's own high current consumption. Fast silicon diodes of any type will do, for example 1N4148 or LL4148 in MiniMELF case. ![]() Bokhanov) VT1, VT3, VT4 transistors may be BC847 or similar (i.e. Schematic diagram Connection circuits (jacks for mobile radios are shown as they are plugged into sockets) GP-340 connector (draft by K. ![]() Another goal is the correct voltage level transformation with regard to the real radio programming circuits. That is because the COM port's logic one is a low voltage level, logic zero is a high voltage level. The main goal of this cable schematics is the invertion of signal levels. The programming cable is intended to be used with a computer RS-232 port for programming radios and other devices.
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