Supplied Accessories; Operating Theory; Operating Notes - Icom IC-R20 Instruction Manual

SUPPLIED ACCESSORIES

q w
t
q Antenna (FA-B04RE) .............................................1
w Belt clip (MB-98) ................................................1 set
e Battery spacer ......................................................1
r Hand strap
.........................................................1
t Battery pack* (BP-206) ..........................................1
yAC adaptor*(BC-149A/D) .......................................1
(The shape of the BC-149A and BC-149D are different.)
*Not supplied with some versions.
iii
e r
y

OPERATING THEORY

Electromagnetic radiation which has frequencies of
20,000 Hz (20 kHz*) and above is called radio frequency (RF)
energy because it is useful in radio transmissions. The IC-
R20 receives RF energy from 0.150 MHz* to 3304.999 MHz
and converts it into audio frequency (AF) energy which in turn
actuates a loudspeaker to create sound waves. AF energy is
in the range of 20 to 20,000 Hz.
*kHz is an abbreviation of kilohertz or 1000 hertz, MHz is abbreviation
of megahertz or 1,000,000 hertz, where hertz is a unit of frequency.

OPERATING NOTES

The IC-R20 may receive its own oscillated frequency, result-
ing in no reception or only noise reception, on some frequen-
cies.
The IC-R20 may receive interference from extremely strong
signals on different frequencies or when using an external
high-gain antenna.