The Technisonic TLC-100 is a six channel, synthesized high performance Low Cost base station. Up to six aeronautical band operating frequencies can easily be programmed in the field via an internal jumper matrix. This 7 Watt transceiver operates from 117.975 MHz to 138.000 MHz in 25.0 KHz steps. Features include high sensitivity and superb adjacent channel rejection which virtually eliminates annoying cross channel interference. The SPG-010 power supply/charger which requires a supply voltage of 117 VAC (220 VAC available as an option) can provide external power to keep an external 12 volt battery fully charged when co-located with the transceiver. In the event of a power failure, the battery will automatically provide emergency power to the transceiver (battery not supplied).