I experienced some problems with YPLog using this power source. If a PTT function is required from the COM port, pin 7 (RTS) can be used to provide this facility. It has also worked successfully when using a USB/Serial adapter from a notebook. No problems have been experienced even at 19200 baud with the IC706. 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. Although the circuit doesn't conform exactly to the RS-232 specification, it does work well and has the advantage of being easily constructed inside a 9 pin D-type shell. I've made small changes to the modem control signals connections. Here is a very simple CI-V interface, originally described by OK2WY. A few circuits have been published for CI-V interfaces, most of which use the MAX232 IC. Icom appears to delight in charging outrageous prices for all transceiver accessories, so many Hams improvise instead.
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