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Problem 1: Antenna gain is usually given in relation to an isotropic antenna (radiating/receiving equally in all directions). It can be shown that the effective area of such an antenna is Aiso = λ2/4π.
Compute the antenna gain Gpar of a circular parabolic antenna as a function of its radius r, where the effective area is Ac = 0.55 A is the physical area of the opening.
Problem 2: When communicating with a geostationary satellite from Earth, the distance between transmitter and receiver is approximately 35,000 km. Assume that Friis' law for free space loss is applicable (ignore any effects from the atmosphere) and that stations have parabolic antennas with gains 60dB (Earth) and 20dB (satellite), respectively, at the 11-GHz carrier frequency used.
a. Draw the link budget between transmitted powers PTX and received power PRX.
b. If the satellite receiver requires a minimum received power of -120 dBm, what transmit power is required at the Earth station antenna?
Describe how an ideal inductor reacts to steady state DC and why. State the equation for finding the instanteneous current in an inductor during the transient period. Explain each part
A 60-watt outdoor lightbulb is advertised as having an average life (i.e. MTTF) of 1,000 operating hours. However, experience has shown that it will also fail on demand an average of once every 120 cycles.
a fully loaded 100 hp induction motor operates at 85% efficiencyfrom a 450 v line.if the power factor is 0.65 lagging.what currentdoes that the motor drawn. if the power factor is 0.9 lagginginstead,what current motor drawn.
What value of emitter resistor would you choose, if: a) You have to amplify the signal of a microphone that has an internal resistance of 100K using a Common Emitter bias configuration b) you have to drive a load of 50 with an Emitter Follower cir..
Titan has numerous hydrocarbon lakes containing a mix of methane and ethane in unknown proportions. A small submersible vehicle will exlpore Kraken Mare, the largest lake.
a.) What isthe minimum sampling frequency to avoid aliasing b.)If the sampling frequency of fs=2500 samples/sec is used how many samples must be taken to give a frequency resolution of 10Hz
The unknown input impedance of a horn antenna operated at a frequency of 300MHz is measured using a slotted transmission line and a Smith Chart. When the antenna is connected to the slotted line, the VSWR on the line is measured to be 4
what do u mean by term slip of three phase induction motor calculate the slip of 4-pole induction motor running at 1470 rpm while bieng connected to a 50 hz three phase source
Estimate the mass transfer area per unit volume (a) for this column, estimate the Hoy value for this column and calculate Noy and estimate the height of the column using your answer for Hoy
i- the current distribution along the antenna , and the radiated power . ii- if the sorce is now replaced by another with frequency = 300 MHz , find the new current distribution and the radiated power assuming that the input current remains .5 Amp..
In general,dimes should be given before nickels, e.g., if there are at leasttwo diis left, these should be given with a singlenickel, rather than five nickels. There is definitely a possibility that no change can be given before the reservoirs are..
Compute the complex conjugate of each of the follwoing expressions: (a) -1; (b) -j/5
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