Problems II
- A two-wire circuit is _____?
- A simple convenient means of adjusting waveguid
power level is provided by what _____?
- It is a high gain, low noise level, audio
frequency amplifier and a square law calibrated vacuum tube voltmeter
used to amplify and measure the output of a crystal and display the information?
- It represents energy that has neither been
radiated into space nor completely transmitted?
- A microwave communication system space loss
expressed in dB is _____?
- Given a paraboloid reflector with a diameter
D = 6 feet and is operated at 1.5 GHz. What is the beamwidth between nulls
of the reflector, f _____?
- Given a paraboloid reflector with a diameter
D = 6 feet and is operated at 1.5 GHz. What is the beamwidth between nulls
of the reflector, f0 _____?
- Point to point communication between A &
B is 90 km (flat terrain). Point A is on top of a hill, 900 ft above sea
level, with a tower height of 23 cm. What is the minimum height of the
antenna at point B?
- A microwave communication set-up has the
following characteristics:
- Transmitter & receiver antenna gain = 10 dB
- line length (transmitter & receiver) = 1.25 ft
- line loss = 1.8 dB/100 ft
- transmitter power = 100 W
- path loss = 125 dB
- modulation = 100%
Determine the signal level received at the receiver station.
- At a distance of 50 km, a 100 W microwave
radio transmitter is used to link to another microwave radio receiver.
The received signal level should be equal to -80 dBm at the frequency
of 6 GHz. Determine the first fresnel zone at mid-point of path.
- A waveguide with 4.5 GHz cut-off frequency
is exited with a 6.7 GHz signal. What is the wavelength of the waveguide?
- A rectangular waveguide has dimensions of
3 cm x 5 cm. What is the TE10 mode cut-off frequency?
- What is the power density in W/m2
at a distance of 1 km from a 1000 W isotropic source?
- A microwave antenna with a length of 6 cm
radiates a 12 cm wavelength signal. Calculate the mean field distance?
- A tapered termination of a length of waveguide
that provides the impedance transformation between waveguide impedance
and free space impedance?
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