3 BASIC OPERATION

Receiving and transmitting

CAUTION: Transmitting without an antenna may dam- age the transceiver.

q Rotate [VOL] to turn power ON.

w Set the audio and squelch levels.

Rotate [SQL] fully counterclockwise in advance.

Rotate [VOL] to adjust the audio output level.

Rotate [SQL] clockwise until the noise disappears.

e To change the channel group, push both [Y] and [Z] on

the transceiver. (p. 7)

 

r Push [Y] or [Z] to select the desired channel. (p. 6)

• When receiving a signal, “

” appears and audio is emitted

from the speaker.

 

• Further adjustment of [VOL] may be necessary.

Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN- NOT be lawfully used by the general public in U.S.A. wa- ters.

IMPORTANT: To maximize the readability of your trans- mitted signal, pause a few sec. after pushing [PTT], hold the microphone 2 to 4 inches (5 to 10 cm) from your mouth and speak into the microphone (M) at a normal voice level.

q yu

t Push [HI/LO] to select the output power if necessary.

• “LOW” appears when low power is selected.

• Choose low power for short range communications, choose high

power for longer distance communications.

• Some channels are for low power only.

y Push and hold [PTT] to transmit, then speak into the mi-

crophone (M).

er

w

r

M

t

• “ ” appears.

• Channel 70 cannot be used for transmission other than DSC.

u Release [PTT] to receive.

M: Microphone

8

Page 14
Image 14
Icom IM402A, IM402SA instruction manual Receiving and transmitting

IM402A, IM402SA specifications

The Icom IM402SA and IM402A are robust mobile transceivers designed for various communication needs, particularly in the marine and recreational sectors. These models are known for their reliability, durability, and advanced features that cater to both casual users and professionals.

One of the standout characteristics of the IM402SA and IM402A is their compact design, making them suitable for a range of vehicles, from boats to vehicles employed in rugged environments. Their sturdy build ensures they can withstand harsh conditions, which is critical for marine use where humidity and saline air can affect equipment longevity.

In terms of features, both models are equipped with a high-performance receiver that offers exceptional clarity and range, ensuring that communication remains clear over long distances. The IM402 series supports multiple frequency bands, enabling users to communicate effectively across various channels. This versatility is crucial in dynamic environments where multiple communication methods may be needed.

Another significant aspect of the Icom IM402SA and IM402A is their advanced digital signal processing (DSP) technology. This feature enhances audio quality by reducing background noise and improving overall clarity, facilitating better communication in noisy environments, such as when on the water or in busy industry settings. The built-in noise-cancellation technology ensures that conversations remain intelligible even when external noises are present.

User-friendly interfaces are a hallmark of Icom products, and the IM402 series is no exception. The intuitive keypad layout and illuminated display make it easy to navigate through settings and channels, even in low-light conditions. Furthermore, programmable function keys allow users to customize their experience, providing quick access to frequently used features.

The transceivers also come with emergency functions, including distress calling capabilities that comply with maritime regulations. This feature is vital for safety, especially for those venturing into remote or potentially hazardous areas. Additional safety features can include weather alerts and access to emergency channels.

In summary, the Icom IM402SA and IM402A mobile transceivers are designed to deliver high-quality, reliable communication with a host of advanced features. Their robust design, superior audio clarity, and user-friendly interfaces make them a practical choice for anyone needing dependable communication in challenging environments. Whether on the water or in the field, the IM402 series stands out as a reliable tool for effective communication.