What kinds of cirs are there in locomotive radio stations?

What are the two kinds of CIR for locomotive radio stations? One is PL-CIR. One is cirhit. It's all a color filter. The excellent function of polarizer is that it can selectively let the light that vibrates in a certain direction pass through, and it is often used to eliminate or weaken the strong reflection of non-metallic surface in color and black-and-white photography, thus eliminating or reducing the light spot.

Working frequency: In 450MHz mode, the transmitting frequency of locomotive radio station and CIR and the receiving frequency of station data receiving decoder are f4 of the second frequency band, that is, 457. 550 MHz.

For example:

Galaxy Music Network FM 106. 1 (Zhengzhou).

Music is characterized by aestheticism and freshness, which gives listeners great imagination.

The only music broadcast FM 103.2 (Chengdu).

FM 103.2, the only music broadcast in Chengdu, is the first non-anchor pop music radio station in Sichuan, which plays pop music all day. Its dynamic and fresh program style has been widely praised since its launch.