Black Box MWU2000-G703, MWU2000-X21, MWU2000-V35 manual LNA Improvement table

2.048Mbps Wireless Modem

NF2 = Noise Figure of the cable = Loss of cable

NF3 = Noise Figure of the modem = 2.8

G1 = Gain of LNA 10 = 10

G2 = Gain of the cable = 1/Loss of cable

(*) All values above are taken in absolute value (not dB).

Use the following table to quickly determine the improvement of the LNA, given different cable-loss. For convenience, the "LNA Improvement" value is converted to logarithmic values (dB).

Table 2-2. LNA Improvement table

For example: in a typical installation with a 20 Meter Heliax cable, the use of an LNA-10 results in an improvement of 5dB to the total link margin, in comparison to the same installation when not using the LNA-10.

1.Connect the LNA-10 RF input directly to the output of the receiving antenna.

2.Attach the LNA-10 RF output directly to the RF cable going down to the Rx connector on the 2.048Mbps Wireless Modem unit.

3.Connect the RG-59 coaxial cable between the “TO CONV” connector of the power inserter and the “Signal and Power out” connector on the LNA-10.

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