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Synchronous Satellite Link: Consider a 2 GHz link between asynchronous satellite and a ground station on the equator. The bandwidth of the up-link and down-link are the same. The orbital radius of the satellite is 36,000 Km and the radius of the Earth is6,400 Km. The satellite antenna beam must just cover the wholeEarth; its transmitted power is 100 w; and its receiver noisetemperature is 300K (because the antenna is looking at the warmEarth). The ground station antenna diameter is 64 cm; its aperture efficiency is 100%; and its receiver noise temperature is 50 K(because it is looking at the cold sky). Note that RF power isusually specified in dB with respect to a reference. The most common reference is 1 mw, which gives rise to the power unit ofdBm. For example -30 dBm is 1 microwatt.
Find: (a) the beam solid angle of the satellite antenna;
(b) the gain of the satellite antenna in dB;
(c) the power received on theground in dBm;
(d) the bandwidth at which the SNR on the ground is10 dB; and
(e) the power that must be transmitted from the ground(in dBm) so the uplink channel capacity will be the same as that ofthe down link. The channel capacity C =BW*log2(1+SNR).
obtain the rotational losses of a universal motor if you are only given the impedance, RPM, voltage,poles, frequency, current and pf Basically I need to solve for the shaft torque and efficiency but can't get my Pout value without the rotational l..
A pool of 200 frames exists for paging of processes A, B, C, D, and E. The processes' page sizes are 100, 200, 50, 150, and 500, respectively. Assuming proportional frame allocation is being deployed, how many frames are allocated to process D
A Si p+-n junction has a donor doping of 5*10^16 cm^-3 on the n side and a cross sectional area of 10^-3 cm^2. If τ(p)= 1μs and D(p) = 10cm^2/s, calculate the current with a forward bias of .5V at 300K.
Write a Matlab program to calculate the electric field due to a line of charge of length 1m. a) Describe the line of charge as a collection of point charges centered on the z-axis. Calculate the electric scalar potential of that same line of charge.
An AM modulator operates with the message signal: m(t) = 9 cos(20πt) - 8 cos(60πt). The unmodulated carrier is given by 110 cos(200πt), and the system operates with an index of 1/2. a. Write the equation for mn(t), the normalized signal with a mini..
BJT Circuit Configurations Compare the input and output impedance for each configuration. Compare the voltage gain and current gain for each configuration.
A star-bus hybrid topology consists of a main three branch star toplogy with each branch connecting three stations in a bus topology. This toplogy is changed to a new bus-ring hybrid topology with main five station bus topology.
A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk automat..
How big will be rated power of the motor if starting current at star-connection and phase to phase voltage of the supply 380 V is (150+17) A. the ratio of starting current for motor is 7 Ir efficiency factor is 0.85 but cos f =0.8
Design the low pass filter with the 3 dB point at 1Khz. DC gain is 0 dB. use the C value as 100 uf and input ac magnitude 1 V. use the AC simulation between 1 mHz to 1 Khz.
Suppose a certain causal signal f(t) has a Laplace transform F(s) = 1. If f(t) is sampled at times kT where T is a constant time interval and integer k>=0, what are the sample values
A transistor current source (also known as current ''sink'') was built with a 2N3904. The Ic was measured for different values of a load resistance. It was noticed that Ic was pretty much constant for the first 1900 ohms values
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