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General| Tuner Type | Automatic |
|---|---|
| Frequency Range | 1.8 - 30 MHz |
| Input Impedance | 50 Ohms |
| Output Impedance | 50 Ohms |
| Memory Locations | 100 |
| Power Requirements | 12 to 15 VDC |
| Antenna Inputs | Two |
Overview of the MFJ-991 IntelliTuner's automatic antenna tuning capabilities and features.
Highlights automatic matching, power handling, memory, L-network, frequency coverage, and technical specs.
Step-by-step instructions for connecting and initially operating the antenna tuner.
Description of the SWR/Wattmeter and all front panel buttons.
Details on power, remote, radio interface, transmitter, antenna, wire, and ground connections.
Instructions for physically placing and connecting the antenna tuner.
Explains how to read the cross-needle meter for forward power, reflected power, and SWR.
Configures tuning parameters like target SWR and auto-tune SWR thresholds.
Setting the desired SWR level for automatic tuning to stop.
Defines the SWR level that triggers automatic tuning in auto mode.
How to select between high/low power ranges or auto range for the SWR/Wattmeter.
Detailed steps for manually adjusting capacitance and inductance for antenna matching.
Explains factory limits on L/C values and how to use the antenna memory.
Interpreting meter needle movements to understand tuner status and errors.
Guidance on proper RF and lightning grounding for safety and performance.
Tips on antenna location and system configuration for best performance.
Addresses common issues with high impedance antenna systems and feedlines.
Details on checking firmware version, self-tests, and relay tests via power-on sequences.
Procedures for resetting to factory defaults, deleting memory, and performing self-tests.
Testing the power-down detection and interpreting failure messages.
Procedures for testing tuner relays and calibrating the internal wattmeter.
Steps to calibrate the SWR bridge for accurate measurements.
Guidance for resolving tuning issues, erratic behavior, and obtaining technical help.
