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(2)高频头(LNB)的本振频率高频头LNB的本振频率是对C波段卫星接而言,LNB的本振频率一般为5.150 GHz,解数字压缩卫星接收机或解码器会根据该频率与卫星频道频率的差值来确定输入频率。LNB本振频率f_本与下行频率f_下和LNB第一中频f_中关系为:f_本=f_下+f_中。对于Ku波段f_本=f_下-f_中。LNB的f_本不能与标准偏离较大,否则也会增加接收难度。
(2) Local oscillator frequency of LNB The local frequency of LNB is the frequency of LNB for the C band satellite connection. The local frequency of the LNB is generally 5.150 GHz. The digital satellite receiver or decoder The input frequency is determined based on the difference between this frequency and the satellite channel frequency. LNB local oscillator frequency f_ and the downlink frequency f_ and LNB first intermediate frequency f_ relationship: f_ this = f_ under + f_ medium. For Ku band f_ this = f_ down-f_ medium. LNB f_ this can not deviate from the standard, otherwise it will increase the difficulty of receiving.