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

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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 lis-
ten on the channel before transmitting.
q Set the operating frequency. (p. 5-8)
• You can transmit only when the 144 MHz or 430 MHz
amateur band is selected on the MAIN band.
w Repeatedly hold down [LOW]
set the transmit output power to S-Low, Low1, Low2,
Mid or High to suit your operating requirements.
• Or while holding down [LOW]
right to select 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.
e Hold down [PTT] to transmit.
• The TX/RX indicator lights red.
• The S/RF meter displays the output power level.
r Speak at your normal voice level.
• Holding the transceiver too close to your mouth or speak-
ing too loudly may distort your speech.
t Release [PTT] to receive.

D About transmit power levels

❍ When an external DC power cable (13.5 V DC) is
connected, or a BP-271/BP-272 is used:
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 used:
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]
ond. But "SLO" appears while transmitting, and the
output power is limited to approximately 0.1 watts.
for 1 second to
, rotate [DIAL] left or
for 1 sec-
5-11
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 overheating, the default setting of the time-out
timer function is set to 5 minutes (p. 16-75). 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 where heat dissipa-
tion will be obstructed if the transceiver is also being
charged with an external power source. Poor heat dis-
sipation may cause a burn, warp the casing or dam-
age 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 source.
TX/RX
indicator
[PTT]
• Transmit power level display
[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)