TV-506 is designed to be used in combination with TS-520 for 50 MHz operation.. Operates in the frequency range from 50.0 MHz to 54.0 MHz Amplification type ALC system is employed. ALC voltage feed back to TS-520 minimises the distortion due to overdriving, assuring quality transmission. Enjoyable excellent operation performance of TS-520 on 50 MHz band by connecting to TS-520 Unique, functional design perfectly matches the styling of TS-520 VFO-520 and SP-520 With minor modification of wiring, changeover between HF and VHF is effected simply manipulating the Power Switch of TV 506.