Transmitting; D About Transmit Power Levels - Icom ID-51A Advanced Instructions

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5
BASIC OPERATION

■ Transmitting

CAUTION: Transmitting without an antenna will dam-
age the transceiver.
NOTE: To prevent interfering, hold down [SQL] to
listen on the channel before transmitting.
q Set the operating frequency. (p. 5-6)
• Transmitting can be done only when the 144 MHz or 430
MHz amateur band is selected as the MAIN band.
Hold down [LOW]
w
transmit output power between S-Low, Low1, Low2,
Mid and High to suit your operating requirements.
• Or while holding down [LOW]
the output power.
• Lower output power during short-range communications
may reduce the possibility of interference to other sta-
tions, and will conserve battery power.
• "SLO"/"LO1"/ "LO2"/"MID" appears when S-low/low 1/low
2/mid power is selected.
• No icon appears when high power is selected.
Hold down [PTT] to transmit.
e
• The TX/RX indicator lights red.
• The S/RF meter displays the output power level.
Speak at your normal voice level.
r
• DO NOT hold the transceiver too close to your mouth or
speak too loudly. This may distort your speech.
Release [PTT] to receive.
t

D About transmit power levels

❍ When the external DC power cable (13.5 V DC) is
connected or BP-271/BP-272 is attached.
: 5 W (High)/2.5 W (Mid)/1.0 W (Low2)/
0.5 W (Low1)/0.1 W (S-Low) (approximately)
❍ When the BP-273 is attached.
: Approximately 0.1 W (S-LOW) (fixed)
NOTE: When using the BP-273 battery case,
"SLO," "LO1," "LO2," "MID" or no icon (high
power) appears on the display by holding
down [LOW]
pears while transmitting, and the output power
is limited to approximately 0.1 watts.
for 1 second to select the
, rotate [DIAL] to select
for 1 second. But "SLO" ap-
R WARNING! NEVER transmit for long periods of
time.
During prolonged transmissions at high power or mid
power, the transceiver radiates heat to protect itself
from overheating. The transceiver's chassis will be-
come hot and may cause a burn.
• To prevent the transceiver's overheating, the default set-
ting of the time-out timer function is set to 5 minutes (p. 16-
68). Be careful when the time-out timer function is turned
OFF or set to a long time period, and you transmit for long
periods.
DO NOT operate the transceiver in a situation that will
obstruct heat dissipation, especially if the transceiver
uses an external power supply. Heat dissipation may
be affected, and it may cause a burn, warp the casing
or damage the transceiver.
NOTE: When the transceiver becomes hot, the trans-
ceiver's heat protection function gradually reduces
the output power to approximately 2.5 watts, then it
stops transmission after that. This is done to protect
the transceiver itself until it can cool down.
CONNECT to only the rated voltage range when us-
ing an external power supply.
TX/RX
indicator
[PTT]
• Transmit power level display
5-10
[DIAL]
Microphone
High power (5 W)
Mid power (2.5 W)
Low2 power (1.0 W)
Low1 power (0.5 W)
S-Low power (0.1 W)