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General| Frequency Range | 144-148 MHz |
|---|---|
| Modulation | FM |
| Weight | 1.2 kg |
| Supply voltage | 13.8 VDC |
| Voltage | 13.8 VDC |
| Type | Mobile VHF Transceiver |
| Receiver Sensitivity | 0.25 μV (12 dB SINAD) |
Specifies output power, emission mode, modulation, deviation, and microphone details for the transmitter.
Details receiver system, modulation acceptance, selectivity, sensitivity, and audio output.
Presents a high-level block diagram of the transceiver's internal circuitry.
Explains the mic amplifier, buffer, driver, power amplifier, ALC, and RF power meter circuits.
Explains PLL, VCO, logic circuits, CPU ports, matrix ports, and S/RF indicators.
Provides essential safety precautions and preparation steps before performing service.
Details the procedure for adjusting the Phase-Locked Loop circuit for frequency stability.
Describes adjustments for ALC, high/low power output, band edges, deviation, tone, and S/N ratio.
Outlines procedures for adjusting receiver sensitivity, S-indicator, squelch, and AF output power.
Shows the internal wiring connections for the EF Unit.
Provides the circuit diagram for the EF Unit, including CPU and related components.
Presents the circuit diagram for the Main Unit (IC-28A/E).
Provides the circuit diagram for the Main Unit (IC-28H).
Presents the circuit diagram for the RX Unit.
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