ECE :: Communication Systems
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A Discone antenna is
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In a two tone AM system the two modulating frequencies are 2000 p and 4000 p rad/sec. If carrier frequency is 2p x 106 rad/sec the frequencies of upper sidebands are
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For a system to be designated as hi-fi, the signal to noise ratio should be at least
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Dolby system of noise reduction divides the total audio spectrum into
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In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about
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In the television system in India, the odd and even fields are scanned
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Consider the following
- A signal f(t) and its Hilbert transform fh(t) have the same energy density spectrum
- A signal f(t) and its Hilbert transform, fh(t) have the same auto correlation function
- A signal f(t) and its Hilbert transform are mutually orthogonal
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Vidicon and plumbicon operate on the principle of
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A TV receiver has a width of 60 cm. The aspect ratio is 4/3. The required EHT supply is about
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The typical squelch circuit
Whatsapp
Facebook
.
ratio at least equal to 50 dB.
= 10.6 μV.
= 45 cm. 
.