Frequently asked questions

To switch wireless channels, follow these steps:

1. Power On the Receiver: Start by turning on the wireless receiver.
2. Access the Menu: Press the "MENU" button to enter the settings menu.
3. Select Frequency Option: Use the up and down keys to navigate to the "FREQ" (frequency) option. Press "ENTER" to access the frequency setting mode.
4. Choose Desired Frequency: Use the up and down keys or a rotary dial to select the desired frequency.
5. Confirm Selection: Press the "ENTER" key to confirm your choice.
6. Ensure Matching Frequencies: Make sure the transmitter and receiver are set to the same frequency to establish a wireless connection.
7. Following these steps will allow you to change the wireless channel on your microphone system and ensure a stable connection.

The NDR-3120 dual-channel auto frequency synchronization and auto selection receiver features rear-mounted fixed antennas and does not support external antennas. If you need to extend the reception range and enhance signal stability, we recommend choosing models that support external antennas.

The NDR-2120 dual-channel auto frequency synchronization and auto selection receiver features rear-mounted fixed antennas and does not support external antennas. If you need to extend the reception range and enhance signal stability, we recommend choosing models that support external antennas.

A wireless microphone, is a microphone without a physical cable. A transmitting circuit and a receiving circuit of the wireless microphone replaces the microphone cable , allowing users to move freely without being restricted by the connecting cable. Therefore, a wireless microphone is composed of a microphone, a transmitter and a receiver.  A wireless microphone has to work with a receiver.

A single channel can only be used by one microphone for one receiver, and two microphones on the same channel will interfere with each other when used at the same time. If you need to use two microphones, please choose a dual channel receiver.

• Improper installation of the antenna (wrong antenna frequency band , unlocked antenna, blocked antenna position, etc.)
• Environmental interference ( Please switch to another channel when interference occurs. )
• Interference from the surrounding audio equipment (We recommend to adjust the position of the receiver at this moment.)
• Choose true-diversity models.

The dual-tuned true diversity has two sets of independent radio wave receiving demodulators, and then the better signal is selected through the diversity circuit to make up for the dead angle of the antenna and obtain the best receiving quality.
The program-controlled diversity has only one set of radio wave receiving demodulators, so the price is lower.

• A selectable-frequency receiver can be used in places where multiple channels and multiple microphones are installed. When it is interfered by radio waves, it can switch to other non-interference frequencies.
• A fixed frequency receiver can be used in personal space. The operating distance is short, and the budget is lower.

Pilotone is a term and technology created by CHIAYO and has been widely used in the industry.

The Pilotone is an improved design for the receiver's existing mute circuit. A secondary audio signal (usually 32.768KHz) is embedded in the carrier and then transmitted along with the transmitter's signal to enable the receiver to recognize the correct signal. The receiver unmutes or activates only when it receives a signal with a Pilotone frequency.

The Pilotone can prevent noise when the receiver is in standby or no signal from the transmitter. Besides, the transmitter has a switching delay circuit and generates no noise in power switch, needing no additional mute switch.

The SQUELCH (SQ) control is on the rear panel of the receiver or SQUELCH SETUP in the control page of LCD display, and its level has been set up. You may adjust it when strong RF interference is encountered.

When the transmitter is turned off but the receiver still has audio output, it is apparent that there is RF interference. At this time, just increase the SQ level to make the receiver filter out background noise when receiving it. However, the receiving distance will be shortened as the SQ level increases. Therefore, maximum receiving distance should be considered when adjusting the SQ level to eliminate noise.

"Compander" is originally created by CHIAYO combining "Compressor "and "Expander", a circuit design for reducing noise. 

In a wireless microphone system, the sound signal will be compressed at a ratio of 2: 1 before transmission in order to bring this signal above the internal noise of the RF linking.
For example,  a signal with 110 dB dynamic range  will be transmitted with an effective range of 55 dB, lower than background noise (around 60 dB) .  The receiver will  identify and recover the signal with a ratio of 1: 2 when receiving it, providing a radio link with the best signal-noise ratio.

Is it possible to identify whether a receiver has a compander circuit? Yes. In a wireless receiving system without a compander circuit, a lot of background noise will occur if the transmitter is more than 20 meters away from the receiver. But a system with such circuit can reach up to 100 meters.

IrDA is the abbreviation of Infrared Data Association. It is a standard for the equipment which use infrared for short-distance transmission. (i.e. computers, PDAs and mobile phones) CHIAYO is the first company to apply this technology to wireless microphone products.

The biggest advantage of CHIAYO's IrDA technology is bidirectional data transmission between receiver and transmitter, with a click on the transmitter to synchrozize the receiver and vise versa. It is different from most unidirectional models seen on the market.