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Answer 1 (a)
Uplink Frequency Band=890 − 915MHz
Downlink Frequency Band = 935 − 960 MHz
Frequency Width for any band =Upper Frequency Limit − Lower Frequency Limit =915−890MHz
=25MHz Width of a frequency channel=200KHz
Maximum Available Channels
= Band Width / Channel Width
However, actually 124 channels are used if you consider the guard bands used between adjacent channels to avoid any inteference
Answer – 1 (b)
Channel Number (C ) = 50
Uplink carrier frequency for channel 50 = F uplink (50)
Fuplink (50) =Baseuplink frequency + ChannelWidthz * Channel Number
=890MHz+(200KHzx50) =890MHz+(0.2x50MHz )
= 900 MHz
Fdownlink (50)=Downlinkcarrier frequency forchannel50+DuplexSpacing =900MHz+45MHz
= 945 MHz
Alternate Method for calculating Downlink carrier frequency for channel 50
Downlink carrier frequency for channel 50 = Fdownlink (50)
Answer 2 (a)
=Basedownlink frequency+ChannelWidthChannel Number =935+(200KHz50)
= 935MHz+(0.250MHz )
= 945 MHz
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