AMSaudio Technical Knowledge Base | Frequently Asked Questions
Quick Answer
Wireless microphone antennas should have a clear line of sight, be properly spaced for diversity reception, stay away from metal obstructions and strong sources of interference, and be positioned at an appropriate height for the coverage area.
AMSaudio recommends first determining whether the problem is related to the RF link, audio link, or system settings, and then troubleshooting accordingly.
First, Identify the Type of Problem
Prioritize checking line of sight, antenna height, antenna spacing, metal obstructions, and feeder/cable losses.
If the RF level drops or diversity reception becomes unstable, troubleshoot the RF link first.
If the RF signal remains stable but the AF signal disappears, check the transmitter input, mute status, and audio output.
If both RF and AF remain normal, check the mixer, signal routing, and PA system.
Step-by-Step Troubleshooting
1. Confirm the equipment information
Confirm the transmitter and receiver models, operating frequency band, and current frequency. Record the location where the problem occurs.
2. Check all hardware 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. Walk through the entire coverage area
Have representative users walk through the entire intended coverage area while monitoring the two diversity antennas and RF level.
Pay attention to areas where the RF level changes significantly or diversity switching becomes unstable.
4. Scan the RF spectrum
With all relevant equipment powered on, perform an on-site spectrum scan.
Avoid strong signals, broadband noise, and occupied frequencies.
5. Coordinate all channels as a complete system
Plan all channels together using a compatible frequency set, rather than selecting frequencies independently.
Then program the coordinated frequencies into the corresponding transmitters and receivers.
6. Check antenna placement and the RF distribution system
Check antenna line-of-sight, diversity connections, feeder/coaxial cable length, connectors, and active antenna gain.
Active antenna gain should only be used to compensate for confirmed feeder or cable losses.
Avoid placing antennas behind large metal structures, inside metal cabinets, or in locations where walls and other obstacles significantly block the RF path.
7. Perform range and walk tests
Complete close-range, maximum-distance, and walk tests.
If necessary, repeat the tests after the audience has entered the venue or after all production equipment has been powered on, as the RF environment may change during the event.
8. Save the test records
Save the frequency plan, equipment photos, and test results.
If the problem can still be reproduced consistently after these checks, submit the complete information to AMSaudio Technical Support for further diagnosis.
Symptoms and What to Check First
| Symptom | Priority Check |
|---|---|
| Problem occurs only at a specific location | Antenna coverage, obstruction, multipath, or localized RF interference |
| All channels experience the problem simultaneously | Shared antennas, antenna distribution system, feeder/coaxial cables, or rack power supply |
| RF is stable but the audio is abnormal | Transmitter input, audio cable, mixer channel, and signal routing |
| Problem appears after the production equipment is powered on | Newly introduced RF interference or electromagnetic noise |
| Operating distance becomes shorter after extending the feeder/coaxial cable | Cable loss or active antenna gain settings |
How AMSaudio Tools Can Help
WTC3 Wireless Terminal Control Console — Used for channel, battery, and signal-strength monitoring, as well as frequency management.
KN800 Interference Signal Detector — Designed for on-site spectrum monitoring and RF interference detection.
AD3 Interference Signal Detector — Suitable for RF detection and frequency planning for touring, stage productions, and mobile events.
DF5000WB Directional Antenna — Designed for directional reception and compensation for confirmed feeder/cable losses.
Antennas & Signal Distribution Systems — Used to properly share antenna systems among multiple wireless receivers.
Frequently Asked Questions
Can I simply replace the audio cable to determine whether it is the problem?
Yes. Replacing the audio cable can be used as a first step, but it should not replace checking the RF/AF indicators.
Wireless dropouts and audio cable faults can sometimes produce similar symptoms, so both the RF and audio paths should be checked.
Will rescanning the frequencies guarantee that the problem will not happen again?
Not necessarily.
The RF environment can change during an event. Antenna visibility, cable connections, nearby equipment, and newly introduced RF sources can all affect system performance.
For large events, always perform a final RF check before the show.
Does increasing gain always increase the operating range?
Not necessarily.
Excessive active antenna gain can overload the receiver input. Gain should be set according to the actual antenna system, feeder/cable losses, and signal distribution losses.
When should I contact AMSaudio Technical Support?
Contact AMSaudio Technical Support when the problem can be reproduced consistently and you have already completed the basic checks for:
Power supply
Connections
Frequencies
RF environment
Antenna placement
Close-range testing
Please provide the complete test records, equipment photos, model information, frequency information, and a description of when and where the problem occurs.
Can the same frequency be used directly in different countries?
Not necessarily.
Frequency bands, transmission power limits, licensing requirements, and applicable regulations vary by country.
Always check local radio regulations and the specifications of the applicable equipment version before using a wireless frequency.
Conclusion
Proper antenna placement is essential for a stable wireless microphone system.
The key is to maintain a clear RF path, appropriate antenna height and spacing, reliable cable connections, and a properly coordinated frequency plan.
Instead of repeatedly replacing equipment, systematically record the RF/AF status, problem location, antenna position, and on-site RF spectrum conditions.
Following a consistent installation and testing procedure can help identify potential RF problems faster, improve system stability, and significantly reduce the risk of interruptions during live events.