Boya Audio Equipment Co. Ltd. BY-WM8 User Manual

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Thanks for choosing BOYA!

The BOYA BY-WM8 is an UHF Dual-Channel wireless microphone system, designed
for ENG, EFP, DSLR video, and dual-Channel can work with two transmitters, 
perfect for interviews as well.
The receiver and the transmitters are lightweight and simple menu to operate.

The BY-WM8 consists of two body-pack transmitters, a portable receiver, and their
accessories as following:

Omni-directional lavalier 
microphone (x2)

Stereo 3.5mm mini plug cable

XLR output cable

Microphone Holder clip (x2)

Wind screen (x2)

Belt clip (x2)

Shoe mount adapter

When you turn the power on, the battery condition is shown by the BATT 
indication in the display section.
Be sure to check the expiration date printed on the new batteries before 
using them.

  NOTE
  1.The indicated battery condition may not be correct if the batteries were not 
     new when installed. If you plan to use the units for a long period, it is 
     recommended that you replace the batteries with brand new ones.
   2.Insufficient battery power can decrease the ability of transmitters and receiver.
     Therefore, make sure your batteries start out with a full charge when using 
     this system, and always carry spare batteries.

  Batteries may leak or explode if mistreated.
  Be sure to follow these instructions:

  1.Make sure install the batteries with correct polarity.
  2.Always replace two batteries together.

3.Do not use different types of batteries or old and new one together.
4.When not using the components for a long period of time, remove the 
   batteries to avoid leakage. If the batteries do leak, clean all leakage from 
   the battery compartment and the component.

Leakage left in the compartment and the component may cause poor battery 
contact. If there seems to be poor battery contact, please consult our local 
dealer.

Attaching the supplied accessories to the body-pack transmitter

For a secure connection, be sure to turn and lock the connector cover.

NOTE

Make sure to attach or remove the microphone after turning off the transmitter.

Push the holder clip against the bottom of the microphone until the holder clip 
clicks into place.

Insert the microphone into the hole at the bottom of the windscreen.

Insert a pointed object such as a ballpoint pen between the belt clip and the 
transmitter to make some space between them, and then remove the end of 
the belt clip from the hole on the side of the transmitter.

To connect the supplied conversion cable to the OUTPUT 
connector

For a secure connection, be sure to turn and lock the connector cover.

Too much 
ambience is 
being picked 
up.

When using an omnidirectional 
microphone like the one 
included with this system, the 
microphone may be picking up 
too much ambience.

Make sure the microphone 
is as close as to the subject
as possible.

Specifications：

System

Oscillator type: PLL Synthesized Control Oscillator
Carrier Frequency Range: 584 MHz-608 MHz (Transmitter A)

568.6MHz-599.9 MHz (Transmitter B)

Channels: 48 
Frequency response: 60Hz-15 KHz+/-3 dB
Operation range: 100m (300')(without obstacle)

Transmitter

RF output power: 20 mW
Antenna: Flexible
Spurious emission: 250 nW or less
Audio input connector: 3.5mm mini jack
Audio input level: 600 mV-2000 mV
Reference deviation: ±7KHz (-60 dBV, 1 KHz input)
Input frequency range: 20 Hz-20 KHz
Power supply: Two AA batteries
Operation time: 6 hours
Dimensions: (H x W x L) 7.0” x 2.6” x 1.1”(17.7 x 6.7 x 2.9 cm)
Weight: 95g (3.4 oz) without batteries

Receiver

Antenna: Flexible
Audio input connector: 3.5mm mini jack
Signal-to-noise ratio: 80 dB
Distortion: 0.8% (-60 dBV, 1 KHz input)
Earphone output level: 60 mW, 32 Ohms/1KHz
Audio output level: 120 mV
Power supply: Two AA batteries
Operation time: 6 hours
Dimensions: (H x W x L) 7.7” x 3.1” x 1.1”(19.6 x 8.0 x 2.9cm)
Weight: 130g (4.6 oz) 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’)

Connect the supplied lavalier microphone here. Fully insert the microphone’s 

    3.5mm plug and make sure it clicks into place, then lock the plug. 
    To remove,release the locking mechanism, then pull the plug out.

1) Long press the power of the transmitter ON or OFF
2) Short press for muting

 For more details about LED indicator, please refer to as following:

Shows the transmission channel.

How to exchange Transmitter A and Transmitter B, please kindy refer to Page 15.

Shows the battery condition

NOTE

1.When the battery power icon is empty and blinking, the batteries are almost 
   out of power, and you will need to change the batteries immediately.

2.The indicated battery condition may not be correct if the batteries were not 
   new when installed. If you plan to use the component for a long period, 
   it is recommended that you replace the batteries with brand new ones.

NOTE

Please make sure the units is turned OFF, because taking out the battery 
compartment during signal transmission may cause high noise.

Before attaching the shoe mount adapter, attach the belt clip.

Reorienting the belt clip: The BY-WM8’s belt clip can easily be removed and 
reattached to the body pack, so you can mount it upside down. To reorient the 
belt clip, please follow the below steps:

1.Push outward on the belt clip at one of the hinges, so one side of the clip 
   pops out.
2.Push the belt clip out from the other hinge to completely remove the clip 
   from the body pack.
3.Realign the belt clip with the body pack, making sure the clip is facing the 
   desired direction.
4.Insert the two-way belt clip into the body pack, one hinge at a time.

To connect the transmitters and the receiver, follow these steps:

1.Make sure the supplied lavalier microphones are connected to the transmitters’
   microphones input or plug a line-level source into the transmitters’ line input.

   Note: If you are connecting the receiver to a sound system, mute the sound
   system. Do not monitor with the headphones at the stage. Anytime you are
   changing the channel, remove your headphones and mute connected sound
   systems to avoid audible RF noise bursts.

2.Turn on the transmitters and the receiver.

3.Set the transmitters and the receiver to the same channel. If you are
   experiencing interference or noise on one channel, try a different channel.

Noted:1) If you are using multiple BY-WM8 wireless systems, make sure

each system is set to a different channel, which can reduce the
chance of intermodulation.

2) If the transmitters and the receiver connect, the power indicator

stays blue. Otherwise, if the power indicator of receiver light off, 
that means, the transmitters and the receiver is disconnected.
For more details, please kindly refer to page 3 .

3) The results are stored in memory automatically. The stored

channel number will appear in the display section in next time if
you turn on the transmitters and the receiver.

4.With the headphone volume low, plug your headphones into the receiver and
   gradually raise the level to a comfortable volume for monitoring the 
   transmission.

6. Once you have determined the transmission quality and level are good, 
   mount the transmitter and the receiver. 

NOTE
1.When you are setting the transmission channel, the transmitter cannot 
   be used to transmit signals.
2.Do not remove the batteries while setting the transmission channel.
3.Make sure that the selected channel is the same on the transmitters and 
   receiver being used in the same system.

  Turn on the transmitters and the receiver, when the display section shows “CH”.

  -Press the + (+ selection) button to increase the channel.  
  -Press the – (- selection) button to decrease the channel.
  -Long press +/- buttons, the channel will increase and decrease 
   automatically.  

  -Press “SET” button, the display section shows “VOL”
  -Press the + (+ selection) button to increase the volume.    
  -Press the – (- selection) button to decrease the volume.
  -Long press +/- buttons, the volume  will increase and decrease 
   automatically.

For more details about VOL function, please see the below:

VOL

+/-

Transmitter

Adjust attenuation level of the
input signal.

Receiver

1. Adjust sound recording level.  
2. Adjust monitor sound level.

.

Operating the BY-WM8 components near electrical equipment 

  (motors, transformers, or dimmers) may cause it to be affected 
  by electromagnetic induction.

Keep the BY-WM8 components as far as from such equipment as possible.

. The presence of the lighting equipment may produce electrical interference 
  over the entire frequency range. Position the BY-WM8 components so that 
  interference is minimized.
. To avoid degradation of the signal-to-noise ratio, DO NOT use the BY-WM8
  components in noisy

Places or in locations subject to vibration, such as the following:
- Near electrical equipment, such as motors, transformers, or dimmers.
- Near air condition equipment or places subject to direct air flow from an air 
  conditioner.
- Near public address loudspeaker.
- Where adjacent equipment might knock against the receiver.

Keep the BY-WM8 components as far from such equipment as possible or use 
buffering materials.

Clean the surface and the connectors of the BY-WM8 components with a dry, 
soft cloth. Never use thinner, benzene, alcohol or any other chemicals, since 
these may mar the finish.

If you have any problem using the BY-WM8 components, use the following 
checklist.
If any problem persist, please consult our local dealer, or contact us directly.

Symptom

Meanings

Remedy

The units does 
not turn on

The polarity orientation of the 
batteries in the battery 
compartment is incorrect.

The batteries are exhausted.

Replace the batteries with 
new ones.

The battery terminals in the 
transmitter are dirty

Clean the + and - terminals 
with cotton swab.

Insert the batteries with the 
correct polarity orientation.

The batteries 
become drained 
quickly.

The batteries are exhausted.

Replace the batteries with 
new ones.

Manganese batteries are being 
used.

Use alkaline batteries. The 
battery life of a manganese 
battery is less than half that 
of an alkaline battery.

The BY-WM8 components is 
being used under cold 
conditions.

The batteries drain quickly 
under cold conditions.

The channel 
cannot be 
changed

An attempt was made to 
change the channel by 
pressing the SET button only.

There is no 
sound.

The channel setting on the 
transmitter is different from 
that on the receiver. 

Use the same channel setting 
on both the transmitter and 
receiver.

The sound is 
weak.

The attenuation level on the 
transmitter is too high.

The input level of the 
transmitter is low. Press the -
button on the transmitter in 
attenuation level setting 
mode to decrease the 
attenuation level.

The line input is selected on the 
transmitter.

Pull the cable out from LINE 
IN.

There is 
distortion in the 
sound

There is 
distortion in the 
sound

The attenuation level on the 
transmitter is too low.

The input level of the receiver 
is extremely high. Press the + 
button on the transmitter in 
attenuation level setting mode 
to increase the attenuation 
level.

The transmitter and the 
receiver are set to 
different channels.

Set the transmitter to the 
same channel.

Headphones with a mon-
aural min jack is used.

Use the headphones with a 
stereo mini jack.

RF interference

.Try a different channel. Make sure 
 both units are on the same 
 channel. 
.Try to position the antennas at a
 45° angle in relation to each other.
 There can be a lot of RF 
 interference outdoors. 
.Try moving indoors, where there 
 is less RF interference.   
.Keep the units' antennas at least 
 2'(0.6m) away from conductive 
 objects like metal and water. 
.Overhead telephone lines, 
 fluorescent lighting, and metal 
 fences can all cause interference.
.Turn off all nearby computers 
 and mobile phones.         

The audio is 
noisy or 
distorted. This 
can include drop
outs, white 
noise, bursts, 
pops and clicks.

RF signal is weak.

Make sure there is an unobstructed 
line of sight between the 
transmitter's and the receiver's 
antennas. 
Keep in mind that your body, 
clothes, and onstage sets are
possible obstructions. 
Make sure the receiver and 
the transmitter are within 
328'(100m) range.
If there are obstructions, you 
may need to move closer.

The input level on the 
camera, recorder, or 
mixer is too high.

Turn down the audio input level on
your camera or recording device. 
Lower the audio output level on
the receiver.
Turn down the gain on your mixer.  
If there is no adjustment on the 
device, and the level is still high, 
adjust the microphone level on the 
transmitter. Keep this level as high 
as possible without distortion.

1

2

3

6

7

4

5

8

9

10

11

12

13

14

15

16

17

18

19

20

21

1) The power LED glows blue when the unit is on.
2) The power LED of transmitter glows red when low power.

The transmitters and the receiver are each powered by two AA batteries. To install 
batteries, please follow these steps:

1. Turn OFF the units, Slide the battery-compartment catches inward 
    (in the direction of the arrows “←,→”).

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5. The Channel and Volume of the Transmitters and the Receiver are “CH-1”
    and “VOL-24” when turn on them for the first time.
    - Adjust channel as you need.
    - Adjust as necessary to make sure an ample level is being transmitted to 
      the receiver. 
      The objective is to transmit the highest level without distortion for the 
      best signal-to-noise ratio throughout the signal path.

Restart the unit, then change 
the channel with the + and - 
buttons.

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.

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 
harmfulinterference 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.

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

CH-A-48

CH-B-48

1

2

3

4

6

5

7

8

9

6

Situation

Transmitter A

Receiver

Transmitter B

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

The transmitter and the receiver connects.

The transmitter A and the receiver connects; 
The transmitter B and the receiver disconnects.

The transmitter A and the receiver disconnects; 
The transmitter B and the receiver connects.

The transmitter and the receiver disconnects.

ANT-A and 
ANT-B light off

ANT-A and 
ANT-B Stay blue

ANT-A stays blue 
ANT-B light off

ANT-A light off; 
ANT-B stays blue

Press to change and enter display parameters.

For details, please see “How to set up channel, VOL, STEREO and MONO” on 

    page 14.

For more details, please see “To remove the belt clip” on page 11.

10

11

 For more details about LED indicator, please refer to as following:

Situation

Transmitter A

Receiver

Transmitter B

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

Stays blue

The transmitter and the receiver connects.

The transmitter A and the receiver connects; 
The transmitter B and the receiver disconnects.

The transmitter A and the receiver disconnects; 
The transmitter B and the receiver connects.

The transmitter and the receiver disconnects.

ANT-A and 
ANT-B light off

ANT-A and 
ANT-B Stay blue

ANT-A stays blue 
ANT-B light off

ANT-A light off; 
ANT-B stays blue

CH-48

3

4

6

8

11

12

9

10

5

7

1

2

Accommodates two AA batteries.
For more details, please see “Installing batteries” on page 8.

1) The power LED glows blue when the unit is on.
2) The power LED of receiver glows red when low power.

Shows the transmission channel.

Shows the battery condition

NOTE
1.When the battery power icon is empty and blinking, the batteries are almost
   out of power, and you will need to change the batteries immediately.

13

Press these buttons to set the transmission channel, attenuation level of

      the input signal, or “STEREO” and ”MONO” mode.

For details, please see “How to set up channel ,VOL, STEREO and MONO” on 

      page 14.

      Press to change and enter display parameters.

For details, please see “How to set up channel, VOL, STEREO and MONO” on 

      page 14.

For more details, please see “To attach the shoe mount adapter” on page 13.

2.The indicated battery condition may not be correct if the batteries were not 
   new when installed. If you plan to use the component for a long period, 
   it is recommended that you replace the batteries with brand new ones.

CAUTION

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by manufacturer.
When you dispose of the battery, you must obay the law in the relative area or 
country.

1. Press “SET” button , the display section shows “STEREO” .
2. Press the + (+ selection) button, the display section shows “MONO” .
3. Press the + (+ selection) button again, it will be “STEREO” Mode.

Important: The Mode that the factory set is “STEREO”.

The results are stored in memory, and the change becomes effectively when you 
turn on the transmitters next time.

1. How to change tranmitter A to tranmitter B
   1) Set display section shows “CH-A-1”. 
   2) Long press “SET” bottom till display shows “CH-B-1”.

Important: Set from any channel (1-48) is OK, for example, if display shows “CH-A-4”, 
                 after long press “SET” bottom, it will show ” CH-B-4”

2. How to change tranmitter B to tranmitter A, just redo the 1) and 2) steps as above.

(3.5mm diameter stereo mini jack)

    To monitor the receiver output, connect the headphones to this connector.

NOTE

-Do not connect headphones with a monaural mini jack. 
-This may lead to short-circuiting of the headphone output, resulting in 
 distorted sound output.

Connect one end of the supplied stereo 3.5mm mini plug-BMP conversion or 

      XLR-BMP conversion output cable here, and the other end to the microphone 
      input on a DSLR camera, camcorder, mixer, or amplifier etc.

IMPORTANT: Both two transmitters can be used for Transmitter A or 

Transmitter B.

Press these buttons to set the transmission channel, or attenuation level of 

     the input signal.

  For details, please see “How to set up channel ,VOL, STEREO and MONO” on 

     page 14.

CE Maintenance

1.Use careful with the earphone maybe excessive sound pressure from earphones and

headphones can cause hearing loss.

2.Risk of explosion if battery is replaced by an incorrect type. Dispose of used batteries according

to the instructions.

3.EUT Operating temperature range: -20° C to 40° C .

4.To prevent possible hearing damage. Do not listen at high volume levels for long periods.

Declaration of Conformity

Boya Audio Equipment (Shenzhen) Co., Ltd. hereby declares that this UHF Dual-Channel

Wireless Microphone System is in compliance with the essential requirements and other relevant

provisions of Directive 1999/5/EC.a copy of the original declaration of conformity may be found

or obtained at http://www.boya-mic.com/