AMSaudio Technical Knowledge Base | Frequently Asked Questions
Direct Answer
The receiver output level, transmitter input level, and mixer preamp gain should be adjusted in stages to avoid excessive noise caused by levels that are too low or clipping caused by levels that are too high.
AMSaudio recommends first determining whether the problem is related to the RF link, audio link, or system settings, and then troubleshooting the relevant part of the system.
First, Identify the Type of Problem
Start by checking the power supply, connections, RF/AF status, frequency spectrum, antennas, and audio signal path.
If the RF level drops or the diversity reception becomes unstable, check the RF link first.
If RF is stable but the AF signal disappears, check the transmitter input, mute status, and audio output.
If both RF and AF appear normal, check the mixer, signal routing, and sound reinforcement system.
Step-by-Step Troubleshooting
1. Confirm the Equipment and Frequency Information
Confirm the transmitter and receiver models, operating frequency band, and current frequency. Record where and when the problem occurs.
2. Check Power, Cables, Antennas, and Connections
Check the batteries, power supply, antennas, coaxial cables, audio cables, and connectors. Make sure there are no loose connections, damaged cables, or incorrect connections.
3. Record the Problem Before Testing
Record the location and time when the problem occurs, together with the operating status of the equipment.
Then perform short-distance, maximum-distance, and walk-around tests to determine whether the problem is related to coverage or the environment.
4. Scan the RF Spectrum
After all equipment used at the venue has been powered on, scan the RF spectrum.
Avoid frequencies affected by strong signals, broadband noise, or existing RF users.
5. Coordinate Compatible Frequencies
Plan all wireless channels as a compatible frequency set and program the selected frequencies into the corresponding transmitters and receivers.
6. Check Antenna Coverage and Distribution
Check the antenna line of sight, diversity connections, feeder cable length, connectors, and active antenna gain.
Active antenna gain should only be used to compensate for confirmed cable or distribution losses. Excessive gain may overload the receiver input.
7. Perform Real-World Coverage Tests
Complete short-distance, maximum-distance, and walk-around tests.
For large events, repeat the test after the audience and major production equipment are in place, because the RF environment may change significantly.
8. Save Test Records
Save the frequency coordination table, equipment photos, and test results.
If the problem can still be reproduced consistently after these checks, submit the complete information to technical support for further diagnosis.
Symptoms and Priority Checks
| Symptom | Priority Checks |
|---|---|
| The problem occurs only at a specific location | Antenna coverage, obstructions, multipath interference, or localized RF interference |
| All channels become abnormal at the same time | Shared antennas, antenna distribution system, feeder cables, or rack power supply |
| RF is stable but the audio is abnormal | Transmitter input, audio cables, mixer channel, and signal routing |
| The problem appears after the main production equipment is powered on | Newly introduced RF interference or electromagnetic noise |
| The operating range becomes shorter after adding a longer feeder cable | Feeder cable loss or incorrect active antenna gain settings |