Reference no: EM13867463
Part A:
1. A balanced transmission line picks up an undesired signal with a 5mW level. After coversion to an unbalanced signal using a center-tapped transformer, the undesired signal is 0.11 µW. Calculate the common mode rejection ratio, CMRR.
2. A fast rise-time 10-V step voltage is applied to a 50-Ω line terminated with an 80-Ω resistive load. Determine the reflection coefficient Γ, EF and Er.
3. Calculate the ratio horizon for a 500-ft transmitting antenna and a receiving antenna of 20ft. Calculate the required height increase for the receiving antenna if a 10% increase in the radio horizon were required.
4. An antenna has maximum forward gain of 14dB at its 108-MHz center frequency. Its reverse gain is -8dB. Its bandwidth extends from 55 to 185 MHz , calculate a) the bandwidth and b) the F/B ratio of the antenna.
5. Calculate the effective radiated power (ERP) of an antenna with a gain of 5 at a power of 0.5 kW.
6. The antenna in question 5 has a forward gain of 18dB and a reverse gain of 5dB, calculate the F/B ratio of this antenna.
7. A ship radio-telephone transmitter operates at 2738 kHz. At a distant point from the transmitter, the 2738 kHz signal has a measured field of 147 mV/m. the second harmonic field at the same point is measured as 405 µV/m. How much has the harmonic emission been attenuated below the 2738 kHz fundamental?
8. Calculate the maximum usable range for a radar system with PRT of 400 µs.
9. A green LED light source functions at a frequency of 5.7 * 1014 Hz, calculate its wavelength.
Part B:
1. A signal level of 0.4 µV is measured on the input to a satellite receiver. Express this voltage in terms of dBµV. Assume a 50-Ω system.
2. A microwave transmitter typically requires a +8dBm audio level to fully drive the input. If a +10dBm level measured, what is the actual voltage level measured? Assume a 600-Ω system.
3. If an impedance matched amplifier has a power gain (POUT/PIN) of 15, what is the value of the voltage gain (VOUT/VIN)?
4. Determine the deviation ratio for an FM system that has maximum possible deviation of 5 kHz and the maximum input frequency is 3 kHz. Is this narrow-or wideband FM?
5. A receiver with a 10 MHz bandwidth has a S/N of 5dB and a sensitivity of -96dBm.
6. What is the dynamic range (in dB) for a 12-bit PCM system?
7. Calculate the number of bits required to satisfy a dynamic range of 48dB.
8. The transmit power for digital communications device is 1W. The data rate is 28.8kbps. Determine the energy per bit.
9. A 56kbps NRZ-L encoded data stream is used in a digital communication link. Determine the minimum bandwidth required for the communications link.
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