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Earth-based 802.11a or 802.11g wireless LAN standards transmit data using a bandwidth of 16.56 MHz. What is the theoretical thermal noise level (in V) in an ideal receiver operating with an input impedance of 50 ohms?
What do the letters PCM and PAM stand for? Why is PCM transmission preferred over PAM transmission? Give at least two reasons in your answer.
(a) What is the tension in the coupling between the first car and the locomotive? (b) If this tension is equal to the maximum force the locomotive can exert on the train, what is the steepest grade up which the locomotive can pull the train at 25 ..
What are the two possible frequencies to which the local oscillator could be set? What bandwidth should the 10.7 MHz IF amplifier have?
Traffic lights are being converted from incandescent bulbs to LED arrays to save operating and maintenance costs. Typically each incandescent light uses three 100-W bulbs, one for each color R,Y,G,A competing LED array consists of 61 LEDs.
Place the relay in the Collector circuit, the resistor in the Base circuit and the diode in parallel with the relay to provide a path for current due to energizing the relay.
A certain pn junction is operating with Vt=26mV and ni=1.08x10^10 electrons/cm^3. The doping concentrations are Na=2x10^15 cm^-3 and Nd=9x10^16cm^-3. The diffusion coefficient are Dn=34cm^2/s and Dp=12cm^2/s.
Modulating Radio Frequency Carriers to Carry Digital Data, Digital radio transmission requires the use of a carrier wave which is modulated by the digital data.
Sketch the DFT(discrete fourier transform)for a square wave with frequency 1Hz and 10 Hz given N=64 and SR(sample rate)=128. Make sure to label your axes.
For a given lithium ion battery, it can supply 0.85 ampere-hours, or 850 (mAh) with a constant output voltage of 3.6 (V). How much energy is stored in this lithium ion battery. How much energy is imparted to an electron that flows
Identify one emerging technology, and evaluate its future prospects by identifying the cultural and social factors that may prevent or promote its successful application. Use concrete details to support your answer.
What is the resistivity of the wire? conductivity? Using the original dimensions of the wire, how much current can you pass through the wire until a 5V signal is degraded 5% or more?
calculate inductance of sensor for air gap of 1mm and 3mm?
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