Tecsun PL-330 User Manual

www.tecsunradios.com.au
23
These forms of amplitude modulation, which cannot be demodulated by the
envelope detector, arise from fairly common situations. Although the
broadcast signal is transmitted as a conventional double-sideband AM wave,
the detuning and skywave reflection of the radio will change this AM signal
into one or a combination of the forms shown in the chart.
When there is adjacent channel interference, TV horizontal scanning
harmonics, interference of the carrier frequency and the like, then using the
upper sideband or lower sideband to receive the unaffected sideband can
significantly reduce the interference. This is because these types of
interference usually only affect one sideband of the AM signal, and the
content of AM radio broadcasts exists in two sidebands, in which each
sideband contains the same content.

Tecsun PL-330 Specifications

General

Modes	AM, FM, SSB
Display	LCD with Backlight
Dimensions	139 x 85 x 26 mm
Memory	850 Stations
Frequency Range	LW: 153-513 kHz
Power Supply	3 x AA batteries or USB 5V DC
Weight	230 g (without batteries)
Sensitivity	FM < 3uV AM < 1mV/m LW < 5mV/m
Speaker	D57 mm
Additional Features	ETM (Easy Tuning Mode), Alarm Clock, Sleep Timer, Key Lock