The TS-520S is a highly sophisticated solid state amateur radio transceiver employing only three vacuum tubes. Operating on all amateur bands between 1.8 and 29.7 MHz, this unit is constructed modularly. All major electronic circuits are wired on easily removed or installed circuit boards. The TS-520S includes many built-in features usually found as extras on other transceivers. Included in the equipment are a VOX circuit, a 25 kHz crystal calibrator, an RIT circuit, a RF attenuator, and an effective noise blanker. The TS-520S also includes automatic gain control (AGC), automatic level control (ALC), provisions for break-in CW with sidetone, a speech processor, and built-in power supplies. The TS-520S also can connect a Digital Display, Model DG-5, (optional). The DG-5 is useful for reading the TS-520S operating frequency as precise as an order of 100 Hz. Designed for operation on SSB or CW, the TS-520S delivers more than 200 watts PEP input. The low power consumption of the TS-520S, resulting from its solid state design, makes the transceiver ideal for portable and mobile operation. Any complicated electronic equipment will be damaged if operated incorrectly, and this transceiver is no exception. Please read all of the operating instructions before putting the TS-520S on the air.