The Technisonic TST-4100/4200/4300 transmitters are single channel remotely controlled, fully synthesized, 19 inch rack mount VHF/AM stand alone components which operate over the frequency range of 117.975 MHz to 138.000 MHz, with 25 KHz channel spacing. These transmitters which offer identical performance (transmit only) to TSC-series of transceivers, are intended for use in applications where remote transmitter and receiver sites are not co-located. The TST-4300 is 25 Watts, the TST-4200 is 15 Watts and the TST-4300 is 7 Watts. TST series transmitters are supplied as standard with a 20 dB transmitter isolator to reduce transmitter inter-mod in areas of high RF density.