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,