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General| Brand | Icom |
|---|---|
| Model | IC-F4008 |
| Category | Transceiver |
| Language | English |
Covers frequency range, number of channels, emission types, and antenna impedance for the transceivers.
Details output power, modulation, frequency deviation, stability, spurious emissions, and audio distortion for the transmitter.
Outlines receiver sensitivity, squelch, intermodulation, spurious response, audio output, hum, noise, and adjacent channel selectivity.
Top view of the main circuit board showing component placement and identification.
Bottom view of the main circuit board showing component placement and identification.
Step-by-step guide for safely removing the transceiver chassis from its housing.
Instructions for detaching the main circuit board unit from the chassis after chassis removal.
Explains the RF, 1st IF, and 2nd IF circuits of the receiver, including filtering and amplification stages.
Describes the 2nd IF mixer, amplifier, demodulator, PLL, and TCXO within the receiver's signal path.
Details the audio frequency path for received signals, including filtering, de-emphasis, and audio amplification.
Introduces the transmitter's audio signal path, modulation, and amplifier stages.
Explains the audio processing for the transmitter, including microphone input, pre-emphasis, and limiter stages.
Describes how the audio signal is used to frequency-modulate the TX VCO for transmission.
Covers the TX power amplifiers, pre-amplifiers, and the Automatic Power Control (APC) circuit.
Explains the voltage-controlled oscillators (VCOs), Phase-Locked Loop (PLL) IC, and their role in frequency generation.
Illustrates the power supply distribution and voltage regulation throughout the transceiver.
Lists the pin assignments and functions for the CPU (IC51), detailing its I/O operations.
Lists the pin assignments and functions for the D/A Converter (IC57), detailing its I/O operations.
Lists required equipment and explains jig cable connections for transceiver adjustments.
Illustrates the proper connection of test equipment like signal generators and power meters.
Guides on using cloning software to create and upload configuration files for adjustments.
Details on accessing and using the software utility for fine-tuning transceiver parameters.
Step-by-step guide for adjusting PLL lock voltage and reference frequency using test equipment.
Instructions for adjusting TX output power, modulation balance, and FM deviation for optimal performance.
Steps for adjusting receiver sensitivity and squelch threshold for accurate signal reception.
Lists mechanical components and part numbers specific to the transceiver's chassis assembly.
Lists mechanical components and part numbers for the Main-A Unit assembly.
Catalog of optional accessories available for use with the transceiver.
Diagram showing the physical layout of components on the top side of the Main-A circuit board.
Diagram showing the physical layout of components on the bottom side of the Main-A circuit board.
A comprehensive block diagram illustrating the functional units and signal flow of the transceiver.
The first section of the voltage diagram for the Main-A unit, detailing power supply lines and regulators.
The second section of the voltage diagram for the Main-A unit, continuing the schematic of power distribution.
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