Name: Tecsun PL-368
Brand: Tecsun
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Example 4: The carrier phase shift is caused by the asymmetry of the

skywave transmission or radio intermediate frequency phase.

The chart shows the demodulation output waveforms of the envelope

detector and synchronous detector. In each situation, the synchronous

detector gives an undistorted output (the frequency response may be

uneven, but there is no distortion). This is not the case with the envelope

detector. The envelope detector can only work correctly when the carrier

is large enough and the upper and lower sidebands are complete mirror

images of each other in amplitude and phase.

Synchronous detectors do not have the limitations of envelope detectors

and can demodulate a wide range of AM signals, for example

double-sideband, double-sideband with a suppressed carrier (DSB-SC),

single sideband without a carrier or with a suppressed carrier, vestigial

sideband (VSB), quadrature AM (QAM) and other signals.

Spectrum

Phasor Diagram

Signal

Envelope

Detector Output

Synchronous

Detector Output

LSB USB

Carrier

USB

LSB

USB

Carrier

USB

LSB

Carrier

LSB USB

Carrier

USB

LSB

LSB USB

Carrier

USB

LSB

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Tecsun PL-368 Specifications

General