In-Line Amplifier and Antenna Powered by Separate Supplies
Figure: In-Line Amplifier and Antenna Powered by Separate Supplies illustrates a more complicated solution using an in-line amplifier that requires a power source that differs from that required by the antenna. The bias-T should include circuitry to prevent DC power from being fed back and the ANTENNAPOWER OFF command must be issued to disable the receiver’s internal LNA power supply. Since the bias-T is not placed between the in-line amplifier and the receiver, DC blocking circuitry must be added between the two.
Proper fusing or current limiting should be incorporated in the external power supply line.
In-Line Amplifier and Antenna Powered by Separate Supplies
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Circuitry to block DC power from feeding back to the receiver is required. |
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The ANTENNAPOWER OFF command must be issued to the receiver to disable the receiver’s internal LNA power output. |
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The current and voltage requirements of your in-line amplifier and antenna may vary. The fuses and supply voltages shown are for illustration purposes only. |