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(a) For communication through sky wave, two waves A and B with frequencies of 1.5 MHz and 3.2 MHz, respectively, are bea
Posted: Tue Apr 26, 2022 2:52 pm
by answerhappygod
- A For Communication Through Sky Wave Two Waves A And B With Frequencies Of 1 5 Mhz And 3 2 Mhz Respectively Are Bea 1 (35.03 KiB) Viewed 47 times
(a) For communication through sky wave, two waves A and B with frequencies of 1.5 MHz and 3.2 MHz, respectively, are beamed in the same direction. Which of these is most likely to go the greatest distance in the ionosphere before experiencing total internal reflection? Please justify your responso. (b) The antenna of a radio receiver gets a signal to noise ratio (S/N) of 80 dB into its 50 0 input impedance. The signal is routed through a radio frequency amplifier (RF Amp), a mixer, and an intermediate frequency amplifier (IF Amp). Figure Q1(a) depicts the power gains and losses related with these devices. Determine the S/N of the RF Amp output, mixer output, and IF Amp output for this situation. Describe your solution in dBm Also, suggest a method to keep the S/N ratio at the IF Amp's output to not less than 75 dB. Prove your suggestion by showing appropriate calculation. RF Amp Ap 9.5 dB NF = 3 dB Mixer Ap. 2.4 dB NF = 6 dB IF Amp Ap = 11dB NF = 2.5 dB