Number of solutions on IF/RF reception & system noise

1. A receiver tunes the HF band (3 to 30 MHz), utilizes up-conversion with an intermediate frequency of 40.525 MHz, and uses high-side injection. Calculate the required range of local oscillator frequencies.

2. An AM broadcast receiver's pre-selector has a total effective Q of 90 to a received signal at 1180 kHz and uses an IF of 455 kHz. Calculate the image frequency and its dB of suppression.

3. We want to operate a receiver with NF = 8 dB at S/N = 15 dB over a 200-kHz bandwidth at ambient temperature. Calculate the receiver's sensitivity.

4. A receiver with a 10-MHz bandwidth has an S/N of 5 dB and a sensitivity of -96 dBm. Find the required NF.

5. The receiver in problem 4 has a dynamic range of 78.7 dB. If it has a 6 dB NF preamp (gain = 20 dB) added to its input, find its sensitivity and dynamic range.

6. An μ-law companding system with μ=100 is used to compand a 0 to 10 V signal. Calculate the system output for inputs of 0, 0.1, and 1 V.