This has since been confirmed by russian sources ; the transmitter consists of two swept - frequency generators of sinusoidal voltage and two parallel horizontal grounded antennas , each about 60 km long 这一点被来自俄方的消息所证实;发射机有两个扫频发生器,产生正弦波,同时有两幅相互平行的水平地面天线,每个天线有60千米长。