Icom IC-T70A HD Instruction Manual - Page 30
Transmitting
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4 BASIC OPERATION ■ Transmitting CAUTION: T ransmitting without an antenna will damage the transceiver. NOTE: To prevent interference, push and hold [MONI] (BAND) to listen on the frequency before transmitting. q S et the operating frequency. (p. 20) • You can transmit on the 144 MHz/440 MHz amateur bands only. • Select the desired output power. See the previous page for details. w P ush and hold [PTT] to transmit. • " " appears. • The S/RF meter shows the output power level. e S peak into the microphone using your normal voice level. • DO NOT hold the transceiver too close to your mouth or speak too loudly. This may distort your speech. r Release [PTT] to return to receive. [PTT] Microphone Appears 23 R WARNING! NEVER transmit for long periods of time. When the transceiver is used for prolonged transmissions at high power or middle power, the transceiver radiates heat to protect itself from overheating. The transceiver's chassis will become hot and may cause a burn. • To prevent the transceiver's overheating, the default setting of the time-out timer function is set to 5 minutes (p. 62). Be careful when the time-out timer function is turned OFF or set to a long time period, and transmission is made for long periods. DO NOT operate the transceiver in a situation that will obstruct heat dissipation, especially if the transceiver is operated with 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 from continuous transmission, etc., the transceiver's heat protection function gradually reduces the output power to 2.5 W (Mid), then it stops transmission after that. This is done to protect the transceiver itself until it has cooled down. • "M" (Power icon) blinks while the heat protection function reduces the output power. • "Hot" is displayed while the heat protection function inhibits trans- mission. While using the battery case: Frequent or continuous transmissions can cause the batteries to overheat. To prevent this, we recommend using the middle or low power settings.