ECE405HW4Su2010

ECE405HW4Su2010 - ECE 405 HOMEWORK#4 SUMMER 2010 DR JAMES S...

This preview shows pages 1–2. Sign up to view the full content.

ECE 405 HOMEWORK #4 SUMMER 2010 ©DR. JAMES S. KANG 1 An angle-modulated wave is described by () 7 ( ) 50cos 2 10 6sin 2 5,000 EM mt t t ππ ⎡⎤ + × ⎣⎦ (a) If this is a PM wave with , what is the message ? 3 p k = (b) If this is an FM wave with 2 3000 f k π rad/s/V, what is the message ? 2 Assume that the maximum allocated transmission bandwidth of an FM transmitter is 220 kHz. Use Carson's rule to answer the following questions. (a) If 80 f kHz Δ= , what message bandwidth B would achieve the maximum allocated bandwidth? (b) If 20 B kHz = , what is the maximum frequency deviation that can be used? 3 An audio signal is bandlimited to 6 kHz. The peak value of the signal is 6 volt. This audio signal frequency modulates a carrier at 30 MHz. Determine the bandwidth of the modulated signal if the deviation constant of this modulation is 2 2000 f k = × . 4 A carrier of frequency 50 kHz is frequency-modulated with ( ) 6cos(2 1000 ) t = × and a modulation index of 9 is achieved. The unmodulated carrier power is 32 watts. (a) Determine the frequency deviation constant f k . (b) Determine the power on the sideband at 60 kHz. 5 Determine the instantaneous frequency of ( ) 6 ( ) 50cos 2 10 20 5sin 2 10 c t t t + + × 6 An angle modulated wave is described by the equation 7 ( )

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/09/2010 for the course ECE ECE 405 taught by Professor Jameskang during the Summer '10 term at Cal Poly Pomona.

Page1 / 3

ECE405HW4Su2010 - ECE 405 HOMEWORK#4 SUMMER 2010 DR JAMES S...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online