This is easily resolved by powering the circuit from RTS (pin 7) instead of DTR (pin4). The program drops the DTR signal, resulting in no power to the interface. If YPLog is configured to use PTT from either the Parallel port or a different serial port from the one used by the CI-V Interface, I experienced some problems with YPLog using this power source. If a PTT function is required from the COM port, pin 7 (RTS) Using a USB/Serial adapter from a notebook. No problems have been experienced even at 19200 baud with the IC706. It has also worked successfully when I've used this interface on various PC's and also Dell Latitude Notebooks with both an IC735 and IC706MkIIG. The transistor types are not critical, I just happen to have plenty of 2N2222As. Please note that the resistor value 4K7 means 4700 ohms. It does work well and has the advantage of being easily constructed inside a 9 pin D-type shell. Although the circuit doesn't conform exactly to the RS-232 specification,
I've made small changes to the modemĬontrol signals connections. Here is a very simple CI-V interface, originally described by A few circuits have been published for CI-V interfaces, most of which
Icom appears to delight in charging outrageous prices for all transceiver accessories,
