The development and coverage of radio and television broadcasting in mountainous Wencheng County are presented, and the possible methods that can be used in remote villages without radio or television coverage at present are discussed in this paper.

Study on horizon overcastting in spatial analysis;

This paper describes the principle and method of expanding LC VCO frequency coverage by weighted capacitor-coding method.

Based on the criterion of avoiding the loss of the effective spatial-frequency information,the restrictive conditions of the spatial arrangement are calculated,and then the effective frequency coverage range and the equivalent aperture are obtained.