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General| Power Output | 50W (VHF), 35W (UHF) |
|---|---|
| Modulation Type | FM |
| Audio Output | 2 W |
| Voltage | 13.8V DC |
| Channel Capacity | 100 channels |
| Frequency Range | 144-148 MHz, 430-450 MHz |
| Memories | 100 |
Explains the PLL and frequency step selection mechanism.
Details the receiver circuitry for 144 MHz and 430 MHz bands.
Explains how S meter circuits work and connect to the microprocessor.
Describes the audio path, volume control, and low-pass filter.
Details the independent squelch circuits for main and sub bands.
Explains how the balance control range is switched for single/dual modes.
Describes the three types of audio muting (MU1, MU2, MU3).
Explains how to select separate or mix modes for speaker output.
Overview of independent transmitting circuits excluding MIC AMP and APC.
Describes the three-stage linear amplifier for stable drive output.
Details the power modules and amplification stages for transmit signal.
Explains the automatic transmit output control and SWR protection.
Overview of PLL and VCO sections, frequency step selection.
Describes the transmit 8V supply and unlock circuit operation.
Block diagram showing PLL and VCO sections for 144/430 MHz bands.
Explains the control circuit for the M54959 Pulse Swallow PLL IC.
Explains the 8R stop circuit for receiving and its interaction with transmit.
Overview of the microprocessor (CPU) controlling transceiver functions.
Describes how keys and rotary encoders are read by the microprocessor.
Lists the pin functions of the μPD75112GF microprocessor.
Shows the input circuit for microphone keys and rotary encoders.
Explains the reset and backup circuits for the microprocessor.
Describes the LCD drivers and display circuit.
Explains the PLL data structure and timing for output from the microprocessor.
Explains the control functions performed by shift registers (IC3, IC4).
Describes the circuit for dimming the pilot lamp.
Explains the squelch-off circuit when the RC-10 remote is connected.
Describes the beep tone generation and shaping circuit.
Explains the tone output using a ladder resistor network for D-A conversion.
Details microprocessor data for the CTCSS unit and detection input.
Describes how S meter and RF meter voltages are coupled to the microprocessor.
Explains busy signals supplied to the microprocessor for band status.
Details pin functions when the RC-10 remote unit is connected.
Lists components and their use/function in the Final Unit.
Lists components and their use/function in the Control Unit.
Lists components and their use/function in the 435 MHz TX-RX Unit.
Lists components and their use/function in the 144 MHz TX-RX Unit.
Lists components and their use/function in the 144 MHz VCO unit.
Lists components and their use/function in the 430 MHz VCO unit.
Lists semiconductor components like diodes, transistors, and ICs.
Lists the necessary test equipment for adjustments.
Outlines the preparation steps and initial settings before adjustments.
Covers general adjustments applicable to both bands.
Details adjustments for the PLL system, including VCO voltage.
Details receiver adjustments for the 144 MHz band.
Details transmitter adjustments for the 144 MHz band.
Details receiver adjustments for the 430 MHz band.
Details transmitter adjustments for the 430 MHz band.
Lists terminal functions for the 430 MHz TX-RX Unit.
Lists terminal functions for the 144 MHz TX-RX Unit.
Lists terminal functions for the Control Unit.
Lists terminal functions for connector CN2.
Lists terminal functions for connector CN102.
Lists terminal functions for the Final Unit.
Schematic and PC board view for 144 MHz PLL Unit A.
Schematic and PC board view for 144 MHz PLL Unit B.
Schematic and PC board view for 144 MHz PLL Unit A.
Schematic and PC board view for 144 MHz PLL Unit B.
Schematic and PC board view for 430 MHz PLL Unit A.
Schematic and PC board view for 430 MHz PLL Unit B.
PC board view of the Control Unit (Component side).
PC board view of the Control Unit (Foil side).
PC board view of 430 MHz PLL Unit A (Component side).
PC board view of 430 MHz PLL Unit A (Foil side).
PC board view of 430 MHz PLL Unit B (Component side).
PC board view of 144 MHz TX-RX Unit (Component side).
PC board view of 144 MHz TX-RX Unit (Foil side).
PC board view of 430 MHz TX-RX Unit (Component side).
PC board view of 430 MHz TX-RX Unit (Foil side).
PC board view of the Final Unit (Component side).
PC board view of the Final Unit (Foil side).
Provides general specifications like frequency range, mode, and power.
Details transmitter specifications including output power and modulation.
Details receiver specifications including sensitivity and selectivity.
Contains notes regarding circuit changes and recommended duty cycle.
