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General| Brand | Icom |
|---|---|
| Model | IC-781 |
| Category | Transceiver |
| Language | English |
Lists precautions for using the IC-781 in various environmental conditions.
Explains the importance of proper grounding for electrical safety and performance.
Mentions 150W output power with low IMD and stable operation.
Initial setup steps: power, antenna connection, and grounding.
Lists initial positions for various switches and controls before operation.
Explains amateur band selection, frequency setting, and memory channel selection.
Instructions for SSB receiving and transmitting, including controls and settings.
Instructions for CW receiving and transmitting, including keyer connections.
Guides through presetting the antenna tuner for various bands.
Troubleshooting for SWR exceeding 3:1 or output power reduction.
Details how to write memory channels from VFO or another section.
Explains how to change memory contents and save them.
Explains how to clear memory channels in VFO/MEMORY or Memory List screen.
Details six scanning functions: programmed, AF, memory, selected memory, fine versions.
Explains programming scan edges using M-WRITE or SCAN CONDITION screen.
Describes RF, IF, and Noise Blanker circuits in the receiver.
Explains the antenna tuner's matching circuits and detectors.
Explains the PLL units for Dual Watch operation and frequency generation.
Provides a chart for troubleshooting common problems and their solutions.
Procedure for resetting the CPU to clear memory information.
Information on replacing the lithium backup battery for memory and clocks.
Guidance on replacing fuses if the transceiver stops functioning.
Calibrating frequency using a reference oscillator or WWV signal.
Step-by-step instructions for safely disassembling the transceiver.
Adjusting BFO frequency using a frequency counter.
General specs: frequency coverage, modes, power supply, temp range, dimensions, weight.
Transmitter specs: output power, modulation, deviation, RTTY shift, emissions.
Receiver specs: IFs, sensitivity, selectivity, spurious rejection, audio output.
Antenna tuner specs: matching range, min input power, band switching time, accuracy.
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