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General| Frequency Range | 136-174 MHz |
|---|---|
| Number of Channels | 128 |
| Channel Spacing | 12.5/20/25 kHz |
| Power Output | 5W |
| Mode | FM |
| Battery Life | 10 hours |
| Operating Voltage | 7.2V DC |
| Channel Capacity | 128 |
| Power Supply | Li-ion battery |
Description of the receiver signal path, including antenna switching, RF amplification, mixing, and IF stages.
Explanation of the transmitter signal path, covering microphone amplification, modulation, and power amplification stages.
Details on the Phase-Locked Loop circuits for frequency stability and control in receive and transmit modes.
Details on the various voltage lines and power supply circuits within the transceiver's main unit.
Listing of port names and functions for CPU (Front Unit) and I/O expander ICs.
Lists required test equipment and adjustment frequency data for performing transceiver adjustments.
Procedure for adjusting the PLL lock voltage for both transmit and receive modes, including check points.
Steps for adjusting reference frequency, output power, and FM deviation using trimmer controls.
Procedure for adjusting the beep audio output level for the transceiver.
Top view layout of the Front Unit PCB for IC-F410 and IC-F420 models.
Top view layout of the Front Unit PCB for IC-F410S and IC-F420S models.
Top view layout of the Main Unit PCB, showing component placement and connector locations.
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