Consider the up conversion of a dc baseband signal of unit amplitude to 6.4 normalized frequency f 0.3. (a) in simulation, digitally up-convert one thousand samples of a dc signal plot an estimate of the power spectral density for the baseband signal. (b) in simulation, digitally up-convert one thousand samples of a dc signal and plot an estimate of the power spectral density for the pass band signal. 6.5 for a line-of-sight link, evaluate the snr for a 100 mw transmitter with transmit and receive antennas with 0 dbi. assume that the link length is 1 kn, the bandwidth is 20 mhz, the carrier frequency is 2.4 ghz, and the noise figure is 6 db.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?