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harkovskaia [24]
4 years ago
5

A transmitter generates a 15-dBm signal and is connected to an antenna using a cable that introduce 2 dB of loss. The cable has

two connectors, one at each end, that intro-duce a loss of 2 dB each. What is the signal level at the input of the antenna in dBm and milliwatts?
Physics
1 answer:
Eva8 [605]4 years ago
8 0

Answer:

9 dBm or 7.94 mW

Explanation:

As per the question:

Signal generated by the transmitter, x_{T} = 15 dBm

Loss by the antenna, L = 2 dB

No. of connectors, n = 2

Loss by each connector, l = 2 dB

Now,

The signal level at the input of the antenna:

P = x_{T} - L - nl = 15 - 2 - 2\times 2 = 9\ dBm

Now, the signal level at the input in milliwatt:

P = \frac{10^{\frac{P(in\ dBm)}{10}}}{1000}

P = \frac{10^{\frac{9}{10}}}{1000} = 7.94\ mW

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