39 lines
1.6 KiB
Plaintext
39 lines
1.6 KiB
Plaintext
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Here is a method of determining which freqs are used in a cellular
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system, and which ones are in what cells. If the system uses
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OMNICELLS, as most do, you can readily find all the channels in a
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cell if you know just one of them, using tables constructed with
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the instructions below.
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Cellular frequencies are assigned by channel number, and for all
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channel numbers, in both wireline and non-wireline systems, the
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formula is:
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Transmit Freq = (channel number x .030 MHz) + 870 MHz
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Receive Freq = (channel number x .030 Mhz) + 825 Mhz
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"Band A" (one of the two blocks) uses channels 1 - 333. To
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construct a table showing frequency by cells, use ch 333 as the
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top left corner of a table. The next entry to the right of
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ch 333 is 332, the next is 331, etc., down to ch 313. Enter
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ch 312 underneath 333, 311 under 332, etc. Each channel across
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the top row is the 1st chan in each CELL of the system; each
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channel DOWN from the column from the the first channel is the
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next freq assigned to that Cell. You may have noted that each
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channel down is 21 channels lower in number. Usually the data
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channel used is the highest numbered channel in a cell.
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"Band B" uses channels from 334 to 666. Construct your table in a
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similar way, with ch 334 in the upper left corner, 335 the next
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entry to the right. The data channel should be the lowest numbered
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channel in each cell this time.
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The tables generated by these instructions are found in the file
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named "CELLPLAN.TXT"
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Channel 3 (394) Tx 881.820 Rx 836.820
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Channel 4 (415) Tx 882.450 Rx 837.
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End of list.
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