Shenzhen Jiayz photo industrial. Ltd BY-WM8PRO ユーザーズマニュアル

www.boya-mic.com

UHF Dual-Channel Wireless Microphone System

Operating Instructions

Thanks for choosing BOYA!

The BOYA BY-WM8 Pro is an upgraded, UHF Dual-Channel 
Wireless Microphone System for capturing audio with dual 
subjects, features an easy-to-read LCD display, a wide 
switching RF bandwidth, PLL-synthesized tuning and digital 
companding circuitry.

Introduction....................................................................1
Contents BY-WM8 Pro-K1..................................................2
Contents BY-WM8 Pro-K2..................................................3 
The Structure of Transmitter..............................................4 
The Structure of Receiver..................................................8
LCD Display Operation Guide...........................................11 
Installing Batteries.........................................................16 
Attaching Accessories.....................................................19
    - Attach Microphone...................................................20
    - Attach the belt clip...................................................21
    - Attach the shoe mount adapter..................................22
Connect Transmitters and Receiver...................................22 
Set up channel,VOL, Channel A/B ON or OFF,
MONO/STEREO..............................................................24 
    - Set up channel........................................................24
    - Set up VOL.............................................................25
    - Set up Channel A/B ON or OFF...................................25
    - Set up MONO/STEREO..............................................26
Troubleshooting.............................................................27
FCC STATEMENT.............................................................29
Specifications................................................................30
Frequency Chart............................................................32

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.

• Dual-Channel Wireless Receiver
• 48 UHF Channels
• Seletable 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

The BY-WM8 Pro-K2 consists of two body-pack transmitters(

TX8 Pro), a portable receiver(RX8 Pro), and their accessories 

as following:

The BY-WM8 Pro-K1 consists of one body-pack transmitter(

TX8 Pro), a portable receiver(RX8 Pro), 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 (x3)

Shoe mount adapter

Omni-directional lavalier 

microphone (x1)

Stereo 3.5mm mini plug cable

Body-pack transmitters(TX8 Pro) (1)

Portable receiver(RX8 Pro) (1)

Body-pack transmitters(TX8 Pro) (2)

Portable receiver(RX8 Pro) (1)

XLR output cable

Microphone Holder clip (x1)

Wind screen (x1)

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.

  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.

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.

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

Too much 

ambience is 

being picked 

up.

When using an omnidir-

ectional 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

Transmitter:

    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.

 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.

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.

Accommodates two AA batteries.

For more details, please see “Installing batteries” on page 16.

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 Pro’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.

Noted:1) If you are using multiple BY-WM8 Pro 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 5 .

          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.

1. The Channel-A and Channel-B of receiver can be adjusted 

    separately, when use two transmitters, transmitter A and 

    transmitter B doesn’t need to keep same channel.
    Just need to keep Channel-A of receiver as same channel as 

    Transmitter A, Channel-B of receiver as same channel as 

    Transmitter B.

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.

NOTE: 

In order to save battery life, when you only use Transmitter A, 

please turn OFF Channel B of Receiver and vice versa.

1) Set up Channel A

     - Press “SET” button of Receiver, the display section shows

        “CH-A”.

     - 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.

Turn Channel A or B ON or OFF
1) Set up Channel A

  - Press “SET” button of Receiver, the display section shows 

     “CH-A-ON” Or “CH-A-OFF”.

  - Press +/- buttons to OFF or ON.

2) Set up Channel B

    - Press “SET” button of Receiver, the display section shows

       “CH-B-ON” Or “CH-B-OFF”.

    - Press +/- buttons to OFF or ON.

For how to Set up “MONO” and “STEREO”, please refer to page 14.

1) Set up Channel A

    - Press “SET” button of Receiver, the display section shows 

       “VOL-A”.

    - 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.

2) Set up Channel B

    -  Press “SET” button of Receiver, the display section shows

       “CH-B”

    -  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.

2) Set up Channel B

    - Press “SET” button of Receiver, the display section shows 

       “VOL-B”.

    - 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.

If you have any problem using the BY-WM8 Pro 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 Pro 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.

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.

2

1

3

4

5

6

7

8

9

10

12

11

13

14

15

16

17

18

19

20

21

23

22

24

25

26

27

28

32

33

29

30

31

The transmitters and the receiver are each powered by two AA 

batteries. To install batteries, please follow these steps:

Press + & -

to unlock

    catches inward (in the direction of the arrows “←,→”).

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.

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 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-01

CH-B-01

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

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 24.

10

11

12

    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.
8. Battery indication

    Shows the battery condition

      Press these buttons to set the transmission channel, 

      attenuation level of the input signal, or “STEREO” and ”MONO” 

      mode.

   

  

     

 

For more details, please see “To attach the shoe mount adapter” 

      on page 22.

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.

How to set “MONO” and “STEREO”
1. Press “SET” button , the display section shows “MONO” .

2. Press the ”+” or ” –“ (+/- selection) button, choose “MONO” 

    and “STEREO” .
Important: The Mode that the factory set is “MONO”.
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 24.

C hannel(C H )

Frequenc y(M H z)  C hannel(C H )

Frequenc y(M H z) 

1   

           556.710 

2   

           557.120 

3   

           557.530 

4   

           557.940 

5   

           558.350 

6   

           558.760 

7   

           559.170 

8   

           559.580 

9   

           559.990 

10   

           560.400 

11   

           560.810 

12   

           561.220 

13   

           561.630 

14   

           562.040 

15   

           562.450 

16   

           562.860 

17   

           563.270 

18   

           563.680 

19   

           564.090 

20   

           564.500 

21   

           564.910 

22   

           565.320 

23   

           565.730 

24   

           566.140 

25   

           566.550 

26   

           566.960 

27   

           567.370 

28   

           567.780 

29   

           568.190 

30   

           568.600 

31   

           569.010 

32   

           569.420 

33   

           569.830 

34   

           570.240 

35   

           570.650 

36   

           571.060 

37   

           571.470 

38   

           571.880 

39   

           572.290 

40   

           572.700 

41   

           573.110 

42   

           573.520 

43   

           573.930 

44   

           574.340 

45   

           574.750 

46   

           575.160 

47   

           575.570 

48   

           575.980 

C hannel(C H )

Frequenc y(M H z)  C hannel(C H )

Frequenc y(M H z) 

1   

           576.390 

2   

           576.800 

3   

           577.210 

4   

           577.620 

5   

           578.030 

6   

           578.440 

7   

           578.850 

8   

           579.260 

9   

           579.670 

10   

           580.080 

11   

           580.490 

12   

           580.900 

13   

           581.310 

14   

           581.720 

15   

           582.130 

16   

           582.540 

17   

           582.950 

18   

           583.360 

19   

           583.770 

20   

           584.180 

21   

           584.590 

22   

           585.000 

23   

           585.410 

24   

           585.820 

25   

           586.230 

26   

           586.640 

27   

           587.050 

28   

           587.460 

29   

           587.870 

30   

           588.280 

31   

           588.690 

32   

           589.100 

33   

           589.510 

34   

           589.920 

35   

           590.330 

36   

           590.740 

37   

           591.150 

38   

           591.560 

39   

           591.970 

40   

           592.380 

41   

           592.790 

42   

           593.200 

43   

           593.610 

44   

           594.020 

45   

           594.430 

46   

           594.840 

47   

           595.250 

48   

           595.660 

MONO

STEREO

√

√

√

√

√

√

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.

    1) Long press the power of the transmitter ON or OFF

    2) Short press for muting

    1) The power LED glows blue when the unit is on.

    2) The power LED of transmitter glows red when low power.

    Shows the battery condition

  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.

①

 Channel A

②

 Channel number (1-48)

③

 Battery indication

Channel A

⑤  

Press the +/- (+/- selection) button to OFF

1

2

3

5

6

4

7

8

CH-A-01

CH-A-01

CH-B-01

CH-A-ON

⑩

 Channel B ON

    Press the +/- (+/- selection) button to OFF

CH-B-ON

⑥

 Press the +/- (+/- selection) button to ON

⑦

 Channel B

⑧

 Channel number (1-48)

CH-A-OFF

CH-B-OFF

CH-B-01

VOL-A-01

④

 The volume of Channel A (1-31)

9

12

10

11

VOL-B-01

⑨

  The volume of Channel B（1-31）

PLL Synthesized Control Oscillator
556.71 MHz-575.98 MHz (Transmitter A)
576.39 MHz-595.66 MHz (Transmitter B)
48 
40 Hz to 18 kHz (+/-3dB)
100m (300')(without obstacle)
14° F to 122° F (-10℃ to +50℃)
14° F to 131° F (-10℃ to +55℃)

Oscillator type:
Carrier Frequency Range:
                                      
Channels:
Frequency response:
Operation range:
Operating temperature:
Storage temperature:

RF output power
Antenna
Spurious emission
Audio input connector
Reference audio input level 
Reference deviation
Input frequency range
Distortion 
Power supply
Operation time
Dimensions
Weight

≤10 mW
1/4λ wire antenna
250nW or less
3.5mm jack
–60 dBV (MIC input, 0 dB attenuation) 
±5 kHz (–60 dBV, 1 kHz input)
20Hz-20KHz
0.5% or less
Two AA size batteries
About 6 hours
208(H) × 67(W) × 29(L)mm 
80g without batteries

Receiver:

Lavalier Microphone

Antenna
Audio output connector
Signal to noise ratio 
Distortion 
Headphone output level 
Audio output level 
Power supply
Operation time
Dimensions
Weight

1/4λ wire antenna
3.5mm jack
70 dB or more 
0.5% or less
30mW (16 Ω) 
–60 dBV 
Two AA size batteries
About 4 hours
208(H) × 67(W) × 29(L)mm 
90g without batteries 

Back electret Condenser 
Omni-directional
35Hz ~ 18 KHz
74dB SPL
-30dB +/-3dB / 0dB=1V/Pa, 1 kHz    
3.5mm locking mini plug
1.2m (4’)

Transducer:
Polar pattern:
Frequency Range:
Signal / Noise:
Sensitivity:
Connector:
Length:

Channel B OFF
Press the +/- (+/- selection) button to ON

11

MONO

STEREO

Press the +/- (+/- selection) button to MONO or STEREO

12

13

13

LCD will be locked automatically in 30 seconds
Long press bottoms “+” and “-“ to unlock.

9

10

5

6

CH-A-01

8

12

11

7

4

3

1

2

13

14

15

Channel B

16

Mute On

BY-WM8 Pro-K2说明书

吴蒙蒙/2018/10/19

BY-WM8 Pro-K2说明书

V02

1 ：1

尺寸：95x125mm

1/1PCS

V02

1F14015BY0114

105g双铜纸 骑马钉 36p

SHENZHEN JIAYZ PHOTO INDUSTRIAL., LTD.

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Shenzhen Jiayz Photo Industrial., Ltd.
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Email: sales@boya-mic.com
www.boya-mic.com / www.jiayz.com