Note
The Synthacoder 22 from Engineering Specialties of Oxnard, California was an alter market accessory for the lcom IC-22S VHF transceiver. !com's 2 meter rig had a diode matrix used to cover two meter frequencies, but only 22 channels. To add or change a frequency, the owner had to solder diodes into different positions on the circuit board. The Synthacoder 22 plugged into the back of the lcom and gave the owner thumbwheel selection of Any frequency in the transceiver's 146-148 MHz range.