What does the Federal Communications Commission do regarding the licensing of radio frequencies?

Explain the basic principles behind wireless communication and the concept of radio frequency (RF) signals.

Question 3 Figure below shows how a single wire can be used to carry measurement data at the same time. This is done by modulating two widely different carrier frequencies with data and using filters to extract the data at the receiving end. Suppose one data channel is a modulated signal of 1.0 to 1.5 kHz and the other is a modulated signal of 50 to 55 kHz. Design the extraction filters using simple RC filters such that the data loss is restricted to 0.707 (3 dB, or 50% power) in the data signals. How much amplitude crossover results? (What is the amplitude ratio of the 50-55 kHz in the 1-1.5-kHz channel and vice versa?) Signal 1 50-kHz Modulator oscillator Filter1 Demodulator Signal 1 23-11 Adder Transmission 1-kHz Modulator Filter2 oscillator Demodulator Signal 2 Signal 2

(B) A commercial 50 92 Radio Shake coaxial cable is used to carry RF signal power from a transmitter to an antenna of 300 2 as a load through flat antenna transmission line with 300 2 characterstic impedance as shown in Figure 3. The above situation would happen if we connect the coaxial cable to the antenna without a matching techinque. Determine: 1- The reflection coefficient at junction B. 2- The input impedance at point A. 3- The reflection coefficient at junction A. 4- The fraction of the reflected power. 5- The fraction of the transmitted power to the antenna. 1²=0 5052 30052 (B) Z₁ = 30052 Figure 3