BOYA BY-WM8 Pro UHF Dual-Channel Wireless Microphone System

Introduction

Thanks for choosing BOYA! The BOYA BY-WM8 Pro is an upgraded, UHF Dual-Channel Wireless Microphone System for capturing audio with dual subjects. It features an easy-to-read LCD display, a wide switching RF bandwidth, PLL-synthesized tuning, and digital companding circuitry. The package is suitable for a wide range of wireless applications such as interviews, electronic news gathering (ENG), electronic field productions (EFP), film production, business, and educational applications, and more.

Features:

• Dual-Channel Wireless Receiver
• 48 UHF Channels
• Selectable Stereo and Mono Mode
• Mic and Line-in
• Selectable Mute function
• Easy-to-read LCD displays
• Automatic LCD-locked Function
• Monitoring sound by headphone output (Receiver)
• More than 6 Hours Continuous Operation
• Operation range can reach up to 100m (300') (without obstacle)
• Two AA batteries for both transmitter and receiver

Package Contents

BY-WM8 Pro-K1 System

The BY-WM8 Pro-K1 consists of one body-pack transmitter (TX8 Pro), a portable receiver (RX8 Pro), and their accessories:

• Portable receiver (RX8 Pro) (1)
• Body-pack transmitter (TX8 Pro) (1)
• Omni-directional lavalier microphone (x1)
• Stereo 3.5mm mini plug cable
• XLR output cable
• Microphone Holder clip (x1)
• Wind screen (x1)
• Belt clip (x2)
• Shoe mount adapter

BY-WM8 Pro-K2 System

The BY-WM8 Pro-K2 consists of two body-pack transmitters (TX8 Pro), a portable receiver (RX8 Pro), and their accessories:

• Portable receiver (RX8 Pro) (1)
• Body-pack transmitters (TX8 Pro) (2)
• Omni-directional lavalier microphone (x2)
• Stereo 3.5mm mini plug cable
• XLR output cable
• Microphone Holder clip (x2)
• Wind screen (x2)
• Belt clip (x3)
• Shoe mount adapter

Transmitter Structure (TX8 Pro)

Components

• 1. Antenna: Transmits the wireless audio signal.
• 2. Line In: Accepts line-level audio sources.
• 3. Microphone input: 3.5mm locking jack for connecting lavalier microphones. For a secure connection, ensure the connector cover is turned and locked. Attach or remove the microphone after turning off the transmitter.
• 4. Power/Mute button: Long press to turn the unit ON/OFF; short press to mute/unmute the microphone.
• 5. Power LED: Indicates power status (Blue: ON, Red: Low battery).
• 6. CH indication: Displays the currently selected transmission channel.
• 7. Battery indication: Shows the remaining battery level. When the icon is empty and blinking, batteries need immediate replacement.
• 8. +/- selection buttons: Used to adjust the transmission channel, attenuation level, or select MONO/STEREO modes.
• 9. SET button: Used to enter parameter adjustment menus and confirm selections.
• 10. Belt clip: Attaches the transmitter to clothing or a belt. It can be reoriented by detaching it from the hinges and reattaching it in the desired orientation.
• 11. 1/4" Thread: For mounting the unit.
• 12. Battery compartment: Houses two AA batteries for power.

Receiver Structure (RX8 Pro)

Components

• 1. Antenna: Receives the wireless audio signal.
• 2. POWER OFF/ON: Main power switch for the receiver.
• 3. Battery compartment: Houses two AA batteries for power.
• 4. Power LED (ANT-A): Indicates the status of the connection for Antenna A (Blue: connected, Off: disconnected).
• 5. Power LED (ANT-B): Indicates the status of the connection for Antenna B (Blue: connected, Off: disconnected).
• 6. Power LED (POWER): General power indicator for the receiver (Blue: ON, Red: Low battery).
• 7. CH indication: Displays the currently selected reception channel.
• 8. Battery indication: Shows the remaining battery level.
• 9. Monitor/Earphone Connector: 3.5mm stereo mini jack for connecting headphones to monitor audio output. Do not use monaural mini jacks, as this may cause short-circuiting.
• 10. LINE OUT (audio output) connector: 3.5mm stereo mini jack for connecting to cameras, mixers, or other audio devices using the supplied cables.

LCD Display Operation Guide

Receiver Display Elements

• CH-A-01: Displays Channel A and its current channel number (e.g., 01).
• VOL-A-01: Displays the volume level for Channel A (e.g., 01).
• CH-A-ON / CH-A-OFF: Indicates whether Channel A is active or inactive.
• CH-B-01: Displays Channel B and its current channel number (e.g., 01).
• VOL-B-01: Displays the volume level for Channel B (e.g., 01).
• MONO / STEREO: Shows the selected audio mode.
• Battery indication: Visual representation of the remaining battery power for the unit.

Control Buttons

• +/- selection buttons: Used to increase or decrease values for channel, volume, or to toggle between MONO and STEREO modes. Long pressing these buttons unlocks the LCD.
• SET button: Used to enter settings menus, navigate between parameters, and confirm selections.

Installing Batteries

The transmitters and the receiver are each powered by two AA batteries.

1. Ensure the unit is turned OFF.
2. Slide the battery-compartment catches inward (indicated by arrows).
3. Carefully remove the battery holder.
4. Insert two AA batteries into the holder, observing the correct polarity markings (+/-) inside the compartment.
5. Replace the battery holder in its original position.

Notes:

• Check the expiration date on new batteries before use.
• Battery condition indication may be inaccurate if batteries were not new when installed. For long periods of use, use brand new batteries.
• Insufficient battery power can decrease system performance. Always carry spare batteries.
• Handle batteries with care: install with correct polarity, replace both batteries together, do not mix battery types or old/new ones. Remove batteries if the unit is not used for a long time. Clean any battery leakage from the compartment and component.

Attaching Accessories

Microphone Attachment

Attach the holder clip to the bottom of the lavalier microphone until it clicks into place. Insert the microphone into the hole at the bottom of the windscreen. Connect the microphone's 3.5mm plug to the transmitter's microphone input, ensuring it locks securely.

Belt Clip Attachment

The belt clip attaches to the transmitter for securing it to clothing or a belt. The clip can be easily removed and reattached to the body pack in an upside-down position by pushing outward on the hinges.

Shoe Mount Adapter

The shoe mount adapter is used to attach the receiver to a camera's accessory shoe.

Connecting Transmitters and Receiver

1. Connect the supplied lavalier microphones to the transmitters' microphone inputs, or plug a line-level source into the transmitters' Line In ports.
2. Turn on both the transmitters and the receiver.
3. Set the receiver's Channel A to match the channel of Transmitter A, and Channel B to match Transmitter B. If using multiple BY-WM8 Pro systems, ensure each system is set to a different channel to reduce intermodulation.
4. Connect headphones to the receiver's monitor jack to check audio levels. Gradually raise the volume to a comfortable level.
5. When the transmitters and receiver are connected, the power indicator on the receiver stays blue. If disconnected, the indicator light turns off.
6. The default channel and volume are typically "CH-1" and "VOL-24" upon first use. Adjust as needed.
7. Mount the transmitter and receiver once transmission quality and level are satisfactory.

Notes:

• When changing channels, remove headphones and mute connected sound systems to avoid audible RF noise bursts.
• The results (channel numbers) are stored in memory automatically and will appear on the display the next time the units are turned on.

Setup Operations

Setting Channel

For Channel A: Press the SET button until "CH-A" is displayed. Use the [+] or [-] buttons to select the desired channel (1-48). Long pressing the +/- buttons allows for automatic channel scrolling.

For Channel B: Press the SET button until "CH-B" is displayed. Use the [+] or [-] buttons to select the desired channel (1-48). Long pressing the +/- buttons allows for automatic channel scrolling.

Setting Volume

For Channel A: Press the SET button until "VOL-A" is displayed. Use the [+] or [-] buttons to adjust the volume level (1-31). Long pressing the +/- buttons allows for automatic volume scrolling.

For Channel B: Press the SET button until "VOL-B" is displayed. Use the [+] or [-] buttons to adjust the volume level (1-31). Long pressing the +/- buttons allows for automatic volume scrolling.

Turning Channel A or B ON/OFF

For Channel A: Press the SET button until "CH-A-ON" or "CH-A-OFF" is displayed. Use the +/- buttons to toggle between ON and OFF.

For Channel B: Press the SET button until "CH-B-ON" or "CH-B-OFF" is displayed. Use the +/- buttons to toggle between ON and OFF.

Note: To save battery life, turn OFF unused channels (e.g., turn OFF Channel B if only using Transmitter A).

Setting MONO/STEREO

Press the SET button until "MONO" or "STEREO" is displayed. Use the [+] or [-] buttons to select the desired mode. The factory default is MONO. Changes are stored in memory and become effective when you turn on the transmitters next time.

Mode Table Description

The table illustrates how audio is routed:

• MONO Mode: Audio from Transmitter A is sent to the Left Channel, and audio from Transmitter B is sent to the Right Channel.
• STEREO Mode: Audio from Transmitter A is sent to both the Left and Right Channels.

Troubleshooting

• Symptom: Units do not turn on.
  Remedy: Check battery polarity, replace exhausted batteries, clean battery terminals.
• Symptom: Batteries drain quickly.
  Remedy: Use alkaline batteries; cold conditions affect battery life.
• Symptom: Channel cannot be changed.
  Remedy: Ensure using +/- buttons, not just SET. Restart and try again.
• Symptom: No sound.
  Remedy: Ensure transmitter and receiver channels match.
• Symptom: Sound is weak.
  Remedy: Increase transmitter attenuation level (decrease attenuation setting), check if Line In is selected, ensure transmitter input level is sufficient.
• Symptom: Distortion in sound.
  Remedy: Decrease transmitter attenuation level (increase attenuation setting), ensure transmitter and receiver are on the same channel, use stereo mini-jack headphones (not monaural).
• Symptom: Audio is noisy or distorted (dropouts, white noise, pops, clicks).
  Remedy (RF Interference): Try a different channel, position antennas at 45 degrees, move indoors if outdoors, keep antennas away from conductive objects, turn off nearby electronics, check for overhead lines or fluorescent lights.
  Remedy (RF Signal Weak): Ensure clear line of sight, stay within range (100m/328ft), reduce obstructions.
  Remedy (Input Level Too High): Lower input level on camera/recorder/mixer, lower receiver output level, or adjust transmitter microphone level to avoid distortion.
  Remedy (Too Much Ambience): Position the microphone as close to the subject as possible.

FCC Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation.

Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help.

RF warning statement: The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction.

Specifications

System

• Oscillator type: PLL Synthesized Control Oscillator
• Carrier Frequency Range: 556.71 MHz - 595.66 MHz (split between Transmitter A and B)
• Channels: 48
• Frequency response: 40 Hz to 18 kHz (+/-3dB)
• Operation range: 100m (300') without obstacle
• Operating temperature: -10°C to +50°C (14°F to 122°F)
• Storage temperature: -10°C to +55°C (14°F to 131°F)

Transmitter

• RF output power: 10 mW
• Antenna: 1/4 wire antenna
• Spurious emission: 250nW or less
• Audio input connector: 3.5mm jack
• Reference audio input level: -60 dBV (MIC input, 0 dB attenuation)
• Reference deviation: +/-5 kHz (for 1 kHz input at -60 dBV)
• Input frequency range: 20Hz-20KHz
• Distortion: 0.5% or less
• Power supply: Two AA size batteries
• Operation time: About 6 hours
• Dimensions: 208 x 67 x 29 mm
• Weight: 80g (without batteries)

Receiver

• Antenna: 1/4 wire antenna
• Audio output connector: 3.5mm jack
• Signal to noise ratio: 70 dB or more
• Distortion: 0.5% or less
• Headphone output level: 30mW (into 16 Ohm)
• Audio output level: -60 dBV
• Power supply: Two AA size batteries
• Operation time: About 4 hours
• Dimensions: 208 x 67 x 29 mm
• Weight: 90g (without batteries)

Lavalier Microphone

• Transducer: Back electret Condenser
• Polar pattern: Omni-directional
• Frequency Range: 35Hz ~ 18 KHz
• Signal / Noise: 74dB SPL
• Sensitivity: -30dB +/-3dB (0dB=1V/Pa, 1 kHz)
• Connector: 3.5mm locking mini plug
• Length: 1.2m (4')

Frequency Chart