Dimetra EBTS RF Distribution » History » Version 1
laforge, 02/19/2016 10:52 PM
1 | 1 | laforge | [[PageOutline]] |
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2 | = RF Distribution System (CFX4041A) = |
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3 | |||
4 | This is a sophisticated combiner for the high-power output signals of the PA of up to 4 Base Radios. |
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5 | |||
6 | In order to ensure optimal impedance matching, the combiner is mechanically tuned by electrical motors |
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7 | which are controlled by some control logic. |
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8 | |||
9 | The combiner inside the system has the following connections (external connections in '''bold'''): |
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10 | * '''4 high-power radio input ports''' (N socket on the front, one close to each motor) |
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11 | * this is where the RF signal emitted by the PA of the BR enters |
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12 | * 4 RF taps, one for each of the high-power radio inputs |
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13 | * they are connected to the controller unit attached to the inside of the front lid |
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14 | * 1 high-power radio output port (N socket) |
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15 | * this output is connected to a power meter inside the same cabinet |
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16 | * 4 stepper motor electrical connections |
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17 | * connected to the controller unit attached to the inside of the front lid |
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18 | * RS-232 serial line for control+monitoring |
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19 | * this is a DB-9 port of the controller unit attached to the inside of the front lid |
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20 | * interconnected to one of the Base Radios (typically BR1) inside the rack |
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21 | |||
22 | The flow of the signals is as follows: |
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23 | * RF from the PA enters at the four combiner inputs |
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24 | * combined RF output leaves through central output of the combiner, from where |
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25 | * it is routed to the FR power meter |
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26 | * whose output socket is routed to the transmit antenna (or a duplexer in case of a shared Rx/Tx antenna) |
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27 | |||
28 | {{{ |
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29 | #!graphviz |
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30 | digraph G { |
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31 | graph [ rankdir = LR ]; |
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32 | |||
33 | //{ rank=same; combiner; controller; }; |
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34 | |||
35 | br1_pa_out -> combiner |
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36 | br2_pa_out -> combiner |
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37 | br3_pa_out -> combiner |
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38 | br4_pa_out -> combiner |
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39 | |||
40 | combiner -> power_meter |
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41 | power_meter -> tx_antenna |
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42 | |||
43 | combiner -> controller [ dir=both color=red ] |
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44 | power_meter -> controller [ color=red ] |
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45 | |||
46 | power_meter [ shape=box ]; |
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47 | combiner [ shape=box ]; |
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48 | controller [ shape=box ]; |
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49 | } |
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50 | }}} |
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51 | |||
52 | == Images == |
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53 | |||
54 | === View into RF Distribution System after front lid is removed === |