Icom AG-1200 Schematic Diagram

Circuit Description

This document presents the schematic diagram for the Icom AG-1200. The diagram details the electronic circuitry, including transistors, diodes, capacitors, resistors, inductors, and relays, along with their respective values and part numbers.

Component Layout

The schematic illustrates the interconnection of components for signal processing and amplification. Key components include:

Antenna Input (J1): Connects to the antenna.
Transceiver Output (J2): Connects to the transceiver.
Relays (RL1, RL2): Used for switching signal paths.
Transistors (Q1, Q2, Q3): Identified as 2SK571 and 2SA1091, likely for amplification stages.
Diodes (D1, D2, D3): Identified as RD3.9E and MI105, potentially for voltage regulation or signal detection.
Resistors (R1-R7): Various values including 680, 68, 4.7, 150, 33 ohms.
Capacitors (C1-C29): Various values including 4P, 47P, 0.001, 10P, and a 10µF capacitor (C22).
Inductors (L1): Identified as LA-232.
Other Components: Including EP3, likely a filter or matching component.

The diagram shows signal flow from the antenna input (J1) through various stages involving transistors, capacitors, and resistors, controlled by relays, to the transceiver output (J2).

Diagram Representation

The schematic is a standard electronic circuit diagram. It uses symbols to represent components and lines to show electrical connections. Ground connections are indicated by the ground symbol (⏚).

Key connections and signal paths:

The input signal from the antenna is fed into J1.
RL1 and RL2 are shown in different switching states, indicating their function in routing signals.
Transistor Q1 (2SK571) is a central component, likely part of an amplifier or mixer stage, with associated biasing and filtering components like R1, C10, C11, C16, C17, and L1.
Transistors Q2 and Q3 (2SA1091) are likely used in supporting roles, possibly as buffer or driver stages, with their respective biasing networks.
The output is connected to J2, labeled 'TO TRANSCEIVER'.

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Circuit Description

Component Layout

Diagram Representation

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