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Provides comprehensive information for optimum performance of the HF-90 radio.
Defines technical terms and acronyms used throughout the manual.
Explains High Frequency (HF) and Single Sideband (SSB) radio communication principles.
Details ground-wave and sky-wave propagation mechanisms for HF/SSB radio.
Discusses key factors like frequency, time of day, season, weather, and interference.
Guidelines for making voice calls: channel selection, PTT usage, and proper ending.
Lists the phonetic alphabet used for spelling out words over the radio.
Describes the available Standard and Advanced models of the HF-90 radio.
Identifies and explains the functions of the HF-90's front panel controls.
Details the operating controls found on the DTMF microphone/handset.
Instructions for switching the HF-90 radio unit on and off.
Explains how to adjust the received signal volume using the control knob.
Describes how to select channels using the up/down scroll keys.
Details how to adjust the clarifier for fine-tuning received signal pitch.
Explains how to change the operating mode between USB and LSB.
Describes activating and using the tune function for manual antenna tuning.
Explains the default display and automatic time-out features of the LED display.
Details how to erase memory, except for the lowest programmed channel.
Explains using the PTT switch for transmitting and cancelling functions.
Explains making and receiving selective calls (Selcall) directly.
Details making and receiving direct calls to a telephone via HF.
Explains using the Beacon facility for signal checks and channel selection.
Describes activating and using Selcall Scan to monitor programmed channels.
Explains muting the receiver while waiting for incoming Selcalls/Telcalls.
Provides a summary of key presses for various advanced functions.
Details operating characteristics when using the HF-90 with the TA-90 autotune system.
Guidelines for using the HF-90 in a mobile setup, including carry cases.
Specifies battery voltage, connection, and fuse recommendations for mobile use.
Explains the importance of adequate grounding for satisfactory mobile system operation.
Discusses antenna types and RF exposure precautions for portable use.
Guidelines for mounting and operating the HF-90 within a vehicle.
Details power cable, voltage, and fuse requirements for vehicle installations.
Explains grounding through the vehicle chassis for antenna systems.
Guidance on mounting whip antennas and connecting to the TA-90 Tuner.
Tips for reducing engine interference via grounding and suppression kits.
Guidelines for installing and operating the HF-90 as a base station.
Warnings about direct AC mains connection and PSU placement.
Recommendations for grounding coaxial connectors and lightning protection.
Discusses optimal antenna types and placement for base station systems.
Details the pin functions for the front panel microphone connector.
Details the pin functions for the rear panel power connector.
Lists various support accessories available for the HF-90 transceiver.
Lists additional technical manuals and guides for the HF-90 and TA-90.
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General