Icom IC-R20 Instruction Manual - Page 4

Supplied Accessories, Operating Theory, Operating Notes - antenna

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SUPPLIED ACCESSORIES q w e r t y q Antenna 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. 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 ICR20 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, resulting in no reception or only noise reception, on some frequencies. The IC-R20 may receive interference from extremely strong signals on different frequencies or when using an external high-gain antenna. iii

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