AMSaudio Technical Knowledge Base | Frequently Asked Questions

Quick Answer

For multi-channel wireless microphone systems, simply setting each device to a different frequency number is not enough. Frequency coordination and on-site spectrum scanning are essential to ensure reliable operation.

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 frequency coordination, local frequency regulations, intermodulation, backup frequencies, and channel records.

• 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 Frequency Coordination Process

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. Power on all wireless and production equipment before scanning

Before frequency coordination, turn on all wireless devices at the venue, as well as relevant equipment such as LED displays, intercom systems, and wireless video transmission equipment.

Then perform a spectrum scan and coordinate all wireless channels together.

4. Scan the RF spectrum

With all relevant equipment powered on, perform an on-site spectrum scan.

Avoid strong signals, broadband noise, and already 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.

This helps minimize the risk of intermodulation interference and channel-to-channel interference.

6. Check the antenna and 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.

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 frequency plan and 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

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

• 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

The key to troubleshooting a wireless microphone system is not repeatedly replacing equipment, but systematically recording the RF/AF status, problem location, and on-site RF spectrum conditions.

For multi-channel systems, proper frequency coordination is essential. Following a consistent frequency-planning and testing procedure can help identify potential interference faster, improve system stability, and significantly reduce the risk of interruptions during live events.