Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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ICOM radios and transceivers use the CI-V interface, which allows you to connect several devices to one common line.
The figure shows a simple CI-V interface with added transmit/receive (PTT) and CW (CW) control circuits. You can connect several transceivers to it, but PTT and CW can only be used in one of them. However, the latest ICOM models have a "software" PTT transmitted over the CI-V bus.
It should be noted that some programs cannot use one COM port for PTT/CW and CAT. In this case, you can use a different COM or printer port for PTT and CW.
Author: N. Fedoseev, UT2UZ, Kiev
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