Better Music Builder VM-93C User manual

®
Professional UHF Rechargeable Wireless Microphone System
VM-93C
Operating Instructions
Passionate about Music
www.BetterMusicBuilder.com
Thank you for purchasing this unit. To
make full and effective use of this unit,
please read this Owner's Manual
carefully before operating it. Please
retain this manual for future reference.
KARAOKE
UHF
Frequency
Selectable
64
POWER
AF RF
CH01:752.20 mh z
RE CE IV ER - B L CD
64 SELECTABLE WIRELESS SYSTEM
AF RF
CH01:763.20 mh z
UP
DOW N
VOLUME
MIN MAX
UP
DOW N
VOLUME
MIN MAX
Better Music Builder
®
UHF DUAL CHANNEL RECEIVER VM-93C
RE CE IV ER - B L CDRE CE IV ER - A L CD
VM-93C CHARGER
Better Music Builder
®
BATTERY CHARGE
Green Light (Full)
POWER
ON/OFF

2
CONTENTS
INTRODUCTION...............................................................................2
RECEIVER SPECIFICATION..................................................................3
THE SYSTEM INCLUDES THE FOLLOWING PARTS................................. 4
SETTING UP YOUR RECEIVER..............................................................4
RECEIVER LCD PANEL DESCRIPTION.................................................... 5
HOW TO SELECT RECEIVER FREQUENCIES..........................................5
HOW TO ADJUST RECEIVER SETTINGS................................................6
HOW TO CONNECT AUDIO OUT.....................................................7
DC-POWER CONNECTION...............................................................8
HANDHELD TRANSMITTER DESCRIPTION............................................. 9
RECHARGEABLE HAND-HELD TRANSMITTER CHARGER........................ 10
HAND-HELD TRANSMITTER LCD PANEL DESCRIPTION..........................11
HOW TO INSERT HAND-HELD TRANSMITTER’S BATTERIES................... 12
HOW TO TURN ON AND OFF HAND-HELD TRANSMITTER..................13
HOW TO CHANGE HAND-HELD TRANSMITTER SETTINGS..................14
TECHNICAL SPECIFICATION............................................................ 15
VM-93C FCC FREQUENCY 750 MHz and 800 MHz.......................... 16
FREQUENCY SCAN GROUPS FOR BAND C & BAND D.......................17
US UHF WIRELESS OPERATING FREQUENCIES............................. 18~19
TROUBLESHOOTING................................................................ 20~21
WARRANTY................................................................................... 22
INTRODUCTION
The new VM-93C wireless microphone is the second generation of UHF
rechargeable wireless microphone system designed by the engineering team of
Better Music Builder.
VM-93C is designed for both commercial and public use. It is a heavy duty
design including two hand-held microphones with one receiver. Each hand-held
microphone has a total of 32 frequencies. Two microphones together have 64
frequencies. We have set up 32 frequencies for each microphone to make the
frequency selection easily. There is also a separate charger base, which is one
of the best in the market with two microphones in one receiver, to allow the user
to charge the battery at any place. This system is reliable for use by KTV clubs,
restaurants, coffee shops and churches, etc.
SYSTEM CHARACTERISTICS
1. Equipped with the latest wireless technology and UHF dual-channel with one
receiver to picks up weak signals and prevents signal interference.
2. Clear LCD screen that can allow you to check AF (Audio Frequency) and RF
(Radio Frequency) signal and battery levels.
3. One receiver has two built-in units (Receiver A and Receiver B).
4. Easy to select channels with pre-set frequencies.
5. Each microphone has 32 channels. There are a total of 64 frequencies in
two microphones.
6. Easy and convenient mounting for portable rack.
7. Adjustable antennas for different angles to receive better signals.
8. A separate charger base is provided.

3
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Taking apart or modifying the
receiver may lead to electric shock,
fire, or damage to the receiver and
will void your warranty.
DC-POWER
DC 14~16V 480mA
UNBALANCED
Receiver A & B
MIXED OUTPUT
0 36120071116-93 3
ANTENNA-B ANTENNA-A
Model No. VM-93C (UHF Microphone)
CALIFORNIA, UNITED STATES OF AMERICA
COMMENTS? E-MAIL: [email protected]
www.BetterMusicBuilder.com
ENGINEERED AND DESIGN IN U.S.A.
FCC: 74.861
SERIAL NO.
Better Music Builder
®
Channel B Channel A
UHF
POWER
Better Music Builder
®
64 SELECTABLE WIRELESS SYSTEM
UP
DOW N
AF RF
CH01:763.20 mhz
DUAL CHANNEL RECEIVER VM-93C
UP
DOW N
AF RF
CH01:752.20 mhz
RECEIVER - A LCD VOLUME
MIN MAX
RECEIVER - B LCD VOLUME
MIN MAXMIN MAX
21 43
13121110 14 15
5 6 87 9
RECEIVER SPECIFICATION
A. NAMES & FUNCTION:
Front Panel:
1. Power button On/Off.
2. Receiver A LCD screen: Channel A with 32 Built-In Channels with
different UHF frequencies.
3. “ ▼ ” DOWN button selects different frequency & model settings (Receiver A)
4. “ ▲ ” UP button selects different frequency & model settings (Receiver A)
5. Volume control (Receiver A)
6. Receiver B LCD screen: Channel A with 32 Built-In Channels with
different UHF frequencies.
7. “ ▼ ” DOWN button selects different frequency & model settings (Receiver B)
8. “ ▲ ” UP button selects different frequency & model settings (Receiver B)
9. Volume control (Receiver B)
Rear Panel:
10. Receiver Antenna Input-B. (Receiver B) BNC Socket.
11. Channel B XLR 3M socket balanced audio output 50Hz~15kHz +/-3dB.
12. Receiver A & B 1/4-inch (6.3 mm) jack socket unbalanced audio output,
mixed channel A & B.
13. Channel A XLR balanced audio output 50Hz~15kHz +/-3dB.
14. Power supply dock with removable IEC cable 14~16V 480mA.
15. Receiver Antenna Input-A. (Receiver A) BNC Socket.

4
ANTENNA-B
THE SYSTEM INCLUDES THE FOLLOWING PARTS
The package comes with one receiver, two transmitters, one charger base, two DC
adaptor, one audio cable, four AA rechargeable batteries, and two antennas.
SETTING UP YOUR RECEIVER
1.Screw the antennas (BNC socket) into the rear panel of the receiver in a
vertical 90° angle and turn it in clockwise to lock it.
You can adjust the antennas to angle differently for adjusting signal strengths.
2.Insert the DC adaptor into the power socket of the rear panel the power
supply must comply the requirement of the system.
3.To turn on, turn Volume to the minimum. After turning on the “POWER” button,
“PRO-MIC” would immediately appear in the LCD screen. Then, it takes about
five seconds for ready to use.
4.Adjust the settings to your liking (See the description for the LCD or control
panel).
5.To turn off, press and hold the power button until the power light turn off. Then
power will automatically shut off.
DC Power
Adaptor: 1 Unit
DC Adaptor for
Charger Base: 1 Unit
Audio Cable (for mixed out): 1 Unit
UHF
POWER
Better Music Builder
®
64 SELECTABLE WIRELESS SYSTEM
UP
DOW N
AF RF
CH01:763.20 mhz
DUAL CHANNEL RECEIVER VM-93C
UP
DOW N
AF RF
CH01:752.20 mhz
RECEIVER - A LCD VOLUME
MIN MAX
RECEIVER - B LCD VOLUME
MIN MAXMIN MAX
Receiver: 1 Set
Receiving
Antenna:
2 Units
8.43 inches
21.4 cm
AA
ALKALINE
BATTERY
AA
ALKALINE
BATTERY
AA
ALKALINE
BATTERY
AA
ALKALINE
BATTERY
AA (1.5V) Rechargeable Battery: 4 Units
Hand-held Transmitter: 2 Set
OFF
15
784.20
CHANE
OFF
15
784.20
CHANE
Transmitter Charger Base: 1 Set
VM-93C CHARGER
Better Music Builder
®
BATTERY CHARGE
GreenLight (Full)
POWER
ON/OFF

5
RECEIVER LCD PANEL DESCRIPTION
After turning on the “POWER” button, LCD screen will light up as below:
1. RF (radio frequency) Indicator
2. AF (audio frequency) Indicator
3. Current Channel/Frequency Display: current value depends on your setting.
If there is static or no sound coming out of your speakers, than
there may be a frequency interruption from another system, change your
frequency to match your transmitter’s (microphone) frequency.
HOW TO SELECT FREQUENCIES
This receiver has two built-in receivers (i.e. Receiver A and Receiver B). The
manufacturer has already pre-set a particular frequency for each channel. To
select the frequency, you can use either Receiver A or Receiver B and press
the upper button for selection. Selectiing frequencies at either Receiver A or
Receiver B will work. You can set up the same channel at both microphones
because the same channel can have different frequencies.
When you set up a particular frequency at Receiver A, you also need to set
the same frequency at the microphone. Please refer to the “Frequency Table”
on page 16.
NOTE
2
1
3
AF RF
CH01:752.20 mh z
AF RF
CH01:763.20 mh z
RECEIVER - B LCD
AF RF
CH01:752.20 mh z
RECEIVER - A LCD

6
HOW TO ADJUST RECEIVER SETTINGS
To adjust your receiver’s channel/frequency by pressing the “ ▲ ” UP or “ ▼
” DOWN button to select your frequency.
Turn “VOLUME” button to adjust your vocal volume.
We recommend setting the volume to the maximum, then control it from
the mixer.
If you or anyone do any damage on any part of the receiver either
accidentally or intentionally, we have the right to void your warranty.
NOTE
NOTE
UHF DUAL CHANNEL RECEIVER VM-93C
UP
DOWN
AF RF
CH08:758.30 mh z
RECEIVER - A LCD VOLUME
MIN MAXMIN MAX
UHF DUAL CHANNEL RECEIVER VM-93C
UP
DOWN
AF RF
CH08:758.30 mh z
RECEIVER - A LCD VOLUME
MIN MAXMIN MAX
UHF DUAL CHANNEL RECEIVER VM-93C
UP
DOWN
AF RF
CH08:758.30 mh z
RECEIVER - A LCD VOLUME
MIN MAXMIN MAX

RISK OF ELECTRIC SHOCK
DO NOT OPEN
Taking apart or modifying the
receiver may lead to electric shock,
fire, or damage to the receiver and
will void your warranty.
DC-POWER
DC 14~16V 480mA
UNBALANCED
Receiver A & B
MIXED OUTPUT
0
36120071116-93
3
Model No. VM-93C (UHF Microphone)
CALIFORNIA, UNITED STATES OF AMERICA
COMMENTS? E-MAIL: [email protected]
w w w . B e t t e r M u s i c B u i l d e r . c o m
ENGINEERED AND DESIGN IN U.S.A.
FCC: 74.861
SERIAL NO.
Better Music Builder
®
Channel B Channel A
ANTENNA-B ANTENNA-A
RISK OF ELECTRIC SHOCK
DO NOT OPEN
Taking apart or modifying the
receiver may lead to electric shock,
fire, or damage to the receiver and
will void your warranty.
DC-POWER
DC 14~16V 480mA
UNBALANCED
Receiver A & B
MIXED OUTPUT
0 36120071116-93 3
Model No. VM-93C (UHF Microphone)
CALIFORNIA, UNITED STATES OF AMERICA
COMMENTS? E-MAIL: [email protected]
w w w . B e t t e r M u s i c B u i l d e r . c o m
ENGINEERED AND DESIGN IN U.S.A.
FCC: 74.861
SERIAL NO.
Better Music Builder
®
Channel B Channel A
ANTENNA-B ANTENNA-A
7
HOW TO CONNECT AUDIO OUT
There are three different connectors as shown in the following diagram:
• Connector 1 is a channel B XLR-balanced audio out
• Connector 2 is a mixed audio output (Channel A and Channel B)
• Connector 3 is a channel A XLR-balanced audio out
Connector 1 (Channel B) is a balanced XLR audio signal. If you connect B to the
mixer or amplifier, then you can control the microphone effect on MIC. B only.
Connector 2 is an unbalanced 1/4 audio signal. If you connect to Connect 2
(1/4), both MIC. A and MIC. B will mix together to produce the same signal. If
you want to produce different effects on MIC. A and MIC. B, you need to
connect to XLR (Connector 1), which is equivalent to channel B, and XLR
(Connector 3), which is equivalent to channel A. You can also adjust different
echo or mic. tone effects on each microphone (i.e. MIC. A and MIC. B).
Connector 3 (Channel A) is a balanced XLR audio signal. If you connect A to the
mixer or amplifier, then you can control the microphone effect on MIC. A only.
UHF WIRELESS SYSTEM DIAGRAM
Audio Mixer Amplifier or a Karaoke Unit Input terminal
XLR
Balance Input
XLR
Balance Input
XLR
Balance Input
XLR
Balance Input
1/4"
Unbalance Input
1/4"
Unbalance Input
1/4"
Unbalance Input 1/4"
Unbalance Input
Rear View
NOTE
Channel A Hand-held Transmitter Channel B Hand-held Transmitter
Connector 1
(XLR Balanced)
1Connector 2
(Mixed A & B)
2Connector 3
(XLR Balanced)
3
OFF
15 78 4 . 2 0
CHANE
OFF
15 78 4 . 2 0
CHANE
Balance Connection

RISK OF ELECTRIC SHOCK
DO NOT OPEN
Taking apart or modifying the
receiver may lead to electric shock,
fire, or damage to the receiver and
will void your warranty.
DC-POWER
DC 14~16V 480mA
UNBALANCED
Receiver A & B
MIXED OUTPUT
0 36120071116-93 3
Model No. VM-93C (UHF Microphone)
CALIFORNIA, UNITED STATES OF AMERICA
COMMENTS? E-MAIL: [email protected]
www.BetterMusicBuilder.com
ENGINEERED AND DESIGN IN U.S.A.
FCC: 74.861
SERIAL NO.
Better Music Builder
®
Channel B Channel A
ANTENNA-B ANTENNA-A
8
DC-POWER CONNECTION
For North America Market using 120V, DC-14~16V 480mA adaptor
For market outside North America using 220V, you may need to change to a
220V~ 240V DC adaptor with a maximum battery capacity of 480mA.
Please make sure to use the right DC adaptor. Otherwise, it may
damage the receiver and the charger because their maximum battery capacity
is different. The product warranty will be void if you use the wrong DC
adaptor.
OPTIONAL: 19” RACK MOUNT KIT
If you want to put the system onto a mount-kit, please follow the below
diagram. Our design has this special feature to allow it to mount on a DJ rack.
It is removable.
Rear View
NOTE
Rack mount kit is not included.
19 inches
7 inches
13.8 inches
Antenna is adjustable.
POWER
AF RF
CH01:752.20 mh z
REC EI VE R - B LCD
64 SELECTABLE WIRELESS SYSTEM
AF RF
CH01:763.20 mh z
UP
DOWN
VOLUME
MIN M AX
UP
DOWN
VOLUME
MIN M AX
Better Music Builder
®
UHF DUAL CHANNEL RECEIVER VM-93C
REC EI VE R - B LCDREC EI VE R - A LCD

OFF
15 784.20
CHANE
9
HAND-HELD TRANSMITTER (Wireless Mic.) DESCRIPTION
NAMES & FUNCTION:
Uncover Looking of the Handheld Transmitter:
1. Condenser and grille
2. LCD digital display
3. Power switch ON/OFF: To turn ON push the switch button UP for 2-3
seconds, until the LCD screen is on. To turn OFF push the switch button
DOWN until LCD screen is off.
4. Battery cover
5. Battery dock: Insert 2x1.5V AA battery or rechargeable battery into the
battery slot, putting battery’s polarity on different ends may damage system
and your warranty may be terminated if damage does occur because of it.
6. Channel/Frequency button: Press the button to adjust Channel/Frequency.
7. Screw hole
8. Plastic cap
321
OPEN
AA
ALKALINE
BATTERY
5
4
OFF
15 784.20
CHANE
6
8
7

10
VM-93C CHARGER
Better Music Builder
®
BATTERY CHARGE
GreenLight (Full)
POWER
ON/OFF
OFF
15
784.20
CHANE
OFF
15
784.20
CHANE
RECHARGEABLE HAND-HELD TRANSMITTER CHARGER
1. Power button ON/OFF
2. Battery Charging Indicator: When the red light is on and
flashing, it indicates that the batteries are being charged. When the
green light is on, it indicates that the batteries are fully charged. It takes
about five hours for a full charge. If the batteries are placed at the
wrong polars, it would damage the batteries. The batteries are not
under product warranty.
3. Charger base: Make sure to connect the right DC adaptor to the charger
base. This system has two DC adaptors: one for the charger base and the
other for the receiver. They have different battery capacity.
4. Power Supply AC 110V, DC-9~15V, Maximum Battery Capacity:
1800mA, Recharging for the first time: 8-10hrs.
Do not use the wrong DC adaptor, otherwise, it would damage the
charger base, which would not be covered under our product warranty. You
may order the charger base separately.
VM-93C CHARGER
Better Music Builder
®
DC 6V
4
3
BATTERY CHARGE
Green Light (Full)
POWER
ON/OFF
BATTERY CHARGE
Green Light (Full)
POWER
ON/OFF
1
2
3.5 inches
9 cm 7 inches
17.8 cm
3.5 inches
9 cm
For North America Market
120V, DC-9~15V,
1800mA adaptor.
For 220V~240V, you may
need to change to a
220V~240V DC adaptor
with a maximum battery
capacity of 1800mA.
NOTE
Recharging time (First Time): 8-10hrs

11
15
784.20
CHANE
HAND-HELD TRANSMITTER LCD PANEL DESCRIPTION
After turning on the “POWER” button, LCD screen will light up as below:
1. Display Channel: Current value depends on your setting.
2. Display Frequency: Current value depends on your setting.
3. Battery Status: Indicates charge remaining in transmitter batteries.
BATTERY STATUS
1
2
3
Indicates a full battery on the transmitter. The
engineering team of Better Music Builder uses the
latest technology to indicate the battery status, so you
can see the battery strength.
After pressing the power button for three seconds, the transmitter should turn
on. If the transmitter is still off, please check the battery. It may very low. You
need to change the battery or recharge it immediately for 8 to 10 hours.
Otherwise, it would damage the battery. The battery is not coverd under our
product warranty.
NOTE
Full Battery
15
784.20
CHANE
Indicates a low battery on the transmitter. When it
shows a low battery as shown on the left, you need
to change the battery or recharge the battery
immediately.
Low Battery
15
784.20
CHANE

12
AA
ALKALINE
BATTERY
AA
ALKALINE
BATTERY
Good
AA ALKALINE
BATTERY AA ALKALINE BATTERY
No Good
OPEN
AA
ALKALINE
BATTERY
OPEN
AA
ALKALINE
BATTERY
HOW TO INSERT HAND-HELD TRANSMITTER’S BATTERIES
Step 1:
Slide open the closely tight battery cover a little bit hard because the
commercial and public use microphones are designed for tight close.
Step 2:
Use one hand to hold onto the top of your transmitter, with your other hand
inserting two rechargeable AA batteries into battery slot. Be careful not to
drop transmitter while inserting the batteries. The batteries are not under
product warranty. If the batteries are dead, replace with new batteries.
Make sure that you insert the battery at the right electric poles, as
shown in picture. Otherwise, it would damage the rechargeable batteries
while they are recharging. The batteries are not under product warranty.
Step 3:
Slide back battery cover.
NOTE
OPEN
AA
ALKALINE
BATTERY AA
ALKALINE
BATTERY

13
HOW TO TURN ON AND OFF HAND-HELD TRANSMITTER
Push the power switch to turn on/off your transmitter. After turning on the
transmitter, there will be signals (i.e. Channel Number, Frequency and Battery
Status) appeared in the LCD screen. After turning off the transmitter, LCD
screen will shut down.
Before turning on the transmitter power, please lower the receiver volume
level to protect other equipment for safety.
OFF
15
784.20
CHANE
To turn ON,
push the switch
button UP for
2-3 seconds
until the LCD
screen is on.
ON
15
784.20
CHANE
To turn OFF,
push the
switch button
DOWN until
LCD screen
is off.
OFF
15
784.20
CHANE
You can order the replacement parts (such as
the microphone head as shown in the above
figure) from any of our authorized dealers.
NOTE
Interchangeable
microphone head
2
1
INTERCHANGEABLE MICROPHONE HEAD
After pushing the power button for three seconds, the transmitter should turn
on. If the transmitter is still off, please check the battery. It may very low. You
need to change the battery or recharge it immediately.
NOTE
NOTE

14
HOW TO CHANGE HAND-HELD TRANSMITTER SETTINGS
Step 3: Selecting Transmitter’s Channel/Frequency
1. Press the Channel/Frequency button to select Channel/Frequency.
2. There are 32 selectable channels/frequencies for high communication
efficiency and also two transmitters for different frquencies.
3. Please make sure the frequency of a microphone match that of the same
receiver.
There are two receivers (Receiver A and B) for the system. Each
channel/frequency has been pre-set by the manufactuer. Please refer to
the following “Channels/Frequencies Table.”
When you first start with Channel 01 and keep on
pressing it to Channel 32, then it will return to Channel 01.
OFF
15
784.20
CHANE
32
765.50
CHANE
01
756.20
CHANE
16
760.70
CHANE
Using A Screw Driver
(not included)
CLOSE
OPEN
Step 1:
The screw is designed to protect the
microphone from being opened too easily to
set the frequencies because this microphone
is for commercial and public use. That’s why
we do not recommend opening the plastic
cap too often to set frequencies.
Step 2:
After removing the screw to take
out the plastic cap, you can
change the frequencies or the
batteries (AA size). To change
the frequencies, please refer to
the following diagram.
NOTE
NOTE
Channel
Number
1
2
3
4
5
6
7
8
9
10
11
Channel
Number
12
13
14
15
16
17
18
19
20
21
22
Channel
Number
23
24
25
26
27
28
29
30
31
32
756.20 MHz
756.50 MHz
756.80 MHz
757.10 MHz
757.40 MHz
757.70 MHz
758.00 MHz
758.30 MHz
758.60 MHz
758.90 MHz
759.20 MHz
Frequency
759.50 MHz
759.80 MHz
760.10 MHz
760.40 MHz
760.70 MHz
761.00 MHz
761.30 MHz
761.60 MHz
761.90 MHz
762.20 MHz
762.50 MHz
Frequency
762.80 MHz
763.10 MHz
763.40 MHz
763.70 MHz
764.00 MHz
764.30 MHz
764.60 MHz
764.90 MHz
765.20 MHz
765.50 MHz
Frequency
Channels/Frequencies Table

15
TECHNICAL SPECIFICATION
A. TECHNOLOGICAL FEATURE OF THE RECEIVER:
1. Frequency Range: UHF 752~798MHz
2. Maximum Frequency Deviation: ±15KHz
3. Signal to Noise Ratio: >100dB
4. Total Harmonic Distortion: <0.2%
5. Frequency Stability: ±0.5%
6. Frequency Response: ±40 Hz~16 KHz
7. Dynamic Range: >100dB
8. Power Supply: AC 110V (For 220V, you may need to change to a 220V~
240V DC adaptor)
9. Operating Temperature: -20oC~+ 50oC
10. Power Supply: DC 14~16V
11. Work Current: 480mA
12. Dynamic Range: >100dB
13. Receiver Dimensions (WxHxD): 13.8x1.8x7.2 (inches)/35x4.5x18.3 (cm)
14. Shipping Weight: 10 lbs / 4.54 kg
B. TECHNOLOGICAL FEATURE OF THE TRANSMITTER:
1. Frequency Range: UHF 752~798MHz
2. Maximum Frequency Deviation: ±15KHz
3. Signal to Noise Ratio: >100dB
4. Total Harmonic Distortion: <0.2%
5. Frequency Stability: ±0.5%
6. Frequency Response: ±40 Hz~16 KHz
7. Dynamic Range: >100dB
8. Transmitter: 8.5mW
9. Operating Temperature: -20oC~+ 50oC
10. Battery Life: 14~16hr
11. Work Current: 140mA
12. Handheld Transmitter Dimensions (WxH): 1.97x10 (inches)/5x25 (cm)
C. TECHNOLOGICAL FEATURE OF THE CHARGER:
1. Power Supply: AC 110V (For 220V, you may need to change to a 220V~
240V DC adaptor)
2. Current: 350mA
3. Power Supply: DC 9V~15V
4. Maximum Battery Capacity: 1800mA
5. Recharging time: 8-10hrs
6. Charger Dimensions (WxHxD): 7x3.5x3.5 (inches)/17.8x9x9 (cm)
THIS SYSTEM INCLUDES THE FOLLOWING
Receiver: 1 Set Charger Base: 1 Unit
Handheld Transmitter: 2 Sets
AA 1.5V Rechargeable Battery: 4 Units
Antenna: 2 Units
DC-Power adaptor: 1 Unit
DC adaptor for Charger Base: 1 Unit
Audio Connecting Cable: 1 Unit
Instructional Manual: 1 PC

16
VM-93C FCC FREQUENCY 750 MHz and 800 MHz
Receiver A
Frequency
752.200 MHz
752.500 MHz
752.800 MHz
753.100 MHz
753.400 MHz
753.700 MHz
754.000 MHz
754.300 MHz
754.600 MHz
754.900 MHz
755.200 MHz
755.500 MHz
755.800 MHz
756.100 MHz
756.400 MHz
756.700 MHz
757.000 MHz
757.300 MHz
757.600 MHz
757.900 MHz
758.200 MHz
758.500 MHz
758.800 MHz
759.100 MHz
759.400 MHz
759.700 MHz
760.000 MHz
760.300 MHz
760.600 MHz
760.900 MHz
761.200 MHz
761.500 MHz
Channel
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Receiver B
Frequency
775.200 MHz
775.500 MHz
775.800 MHz
776.100 MHz
776.400 MHz
776.700 MHz
777.000 MHz
777.300 MHz
777.600 MHz
777.900 MHz
778.200 MHz
778.500 MHz
778.800 MHz
779.100 MHz
779.400 MHz
779.700 MHz
780.000 MHz
780.300 MHz
780.600 MHz
780.900 MHz
781.200 MHz
781.500 MHz
781.800 MHz
782.100 MHz
782.400 MHz
782.700 MHz
783.000 MHz
783.300 MHz
783.600 MHz
783.900 MHz
784.200 MHz
784.500 MHz
Receiver A
Frequency
763.200 MHz
763.500 MHz
763.800 MHz
764.100 MHz
764.400 MHz
764.700 MHz
765.000 MHz
765.300 MHz
765.600 MHz
765.900 MHz
766.200 MHz
766.500 MHz
766.800 MHz
767.100 MHz
767.400 MHz
767.700 MHz
768.000 MHz
768.300 MHz
768.600 MHz
768.900 MHz
769.200 MHz
769.500 MHz
769.800 MHz
770.100 MHz
770.400 MHz
770.700 MHz
771.000 MHz
771.300 MHz
771.600 MHz
771.900 MHz
772.200 MHz
772.500 MHz
Channel
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Receiver B
Frequency
787.200 MHz
787.500 MHz
787.800 MHz
788.100 MHz
788.400 MHz
788.700 MHz
789.000 MHz
789.300 MHz
789.600 MHz
789.900 MHz
790.200 MHz
790.500 MHz
790.800 MHz
791.100 MHz
791.400 MHz
791.700 MHz
792.000 MHz
792.300 MHz
792.600 MHz
792.900 MHz
793.200 MHz
793.500 MHz
793.800 MHz
794.100 MHz
794.400 MHz
794.700 MHz
795.000 MHz
795.300 MHz
795.600 MHz
795.900 MHz
796.200 MHz
796.500 MHz
Group A Group B

17
Band C
Band C Scan Group 1 Band C Scan Group 2 Band C Scan Group 3
TV Ch. Frequency – MHz * TV Ch. Frequency – MHz * TV Ch. Frequency – MHz *
25 (None) 0 25 541.500 1 25 541.500 1
26 542.750 26 542.750 26 542.125
26 545.500 26 544.375 26 543.500
26 547.125 26 544.750 26 544.000
26 547.375 4 26 545.750 26 546.250 4
27 549.750 26 547.500 5 27 548.250
27 550.375 27 (None) 0 27 549.750 2
27 550.625 3 28 554.250 28 555.750
28 557.250 28 556.125 28 556.625
28 557.500 28 557.500 28 558.250
28 559.250 28 559.375 4 28 559.375 4
28 559.500 4 29 560.000 29 560.125
29 562.000 29 561.875 29 561.500
29 563.375 29 562.250 29 564.000
29 563.625 3 29 563.250 29 564.250 4
30 566.000 29 565.500 5 30 566.125 1
30 566.250 2 30 566.000 1
Band D
Band D Scan Group 1 Band D Scan Group 2 Band D Scan Group 3
TV Ch. Frequency – MHz * TV Ch. Frequency – MHz * TV Ch. Frequency – MHz *
44 655.500 1 44 655.875 1 44 655.500
45 658.000 45 656.250 44 655.750 2
45 658.375 45 658.500 45 656.625
45 659.250 45 659.750 45 658.500
45 659.500 45 660.000 45 658.750
45 661.500 5 45 660.500 5 45 659.500 4
46 662.375 46 664.375 46 662.750
46 662.750 2 46 665.500 2 46 665.250 2
47 669.625 47 671.625 47 671.250
47 671.750 2 47 672.000 2 47 672.375
48 674.750 48 674.000 47 673.125 3
48 675.750 48 674.500 48 674.125
48 676.125 48 675.750 48 674.500
48 678.000 48 676.750 48 675.375
48 678.250 48 678.250 5 48 678.625
48 679.500 6 49 680.250 1 48 679.125 5
49 (None) 0 49 (None) 0
* Number of wireless frequencies in TV Channel.
FREQUENCY SCAN GROUPS FOR BAND C & BAND D

18
Band C: 541.500 - 566.375 MHz
TV Ch.
25 --- --- --- --- 541.500 541.625 541.750 541.875
26 542.000 542.125 542.250 542.375 542.500 542.625 542.750 542.875
26 543.000 543.125 543.250 543.375 543.500 543.625 543.750 543.875
26 544.000 544.125 544.250 544.375 544.500 544.625 544.750 544.875
26 545.000 545.125 545.250 545.375 545.500 545.625 545.750 545.875
26 546.000 546.125 546.250 546.375 546.500 546.625 546.750 546.875
26 547.000 547.125 547.250 547.375 547.500 547.625 547.750 547.875
27 548.000 548.125 548.250 548.375 548.500 548.625 548.750 548.875
27 549.000 549.125 549.250 549.375 549.500 549.625 549.750 549.875
27 550.000 550.125 550.250 550.375 550.500 550.625 550.750 550.875
27 551.000 551.125 551.250 551.375 551.500 551.625 551.750 551.875
27 552.000 552.125 552.250 552.375 552.500 552.625 552.750 552.875
27 553.000 553.125 553.250 553.375 553.500 553.625 553.750 553.875
28 554.000 554.125 554.250 554.375 554.500 554.625 554.750 554.875
28 555.000 555.125 555.250 555.375 555.500 555.625 555.750 555.875
28 556.000 556.125 556.250 556.375 556.500 556.625 556.750 556.875
28 557.000 557.125 557.250 557.375 557.500 557.625 557.750 557.875
28 558.000 558.125 558.250 558.375 558.500 558.625 558.750 558.875
28 559.000 559.125 559.250 559.375 559.500 559.625 559.750 559.875
29 560.000 560.125 560.250 560.375 560.500 560.625 560.750 560.875
29 561.000 561.125 561.250 561.375 561.500 561.625 561.750 561.875
29 562.000 562.125 562.250 562.375 562.500 562.62 5562.750 562.875
29 563.000 563.125 563.250 563.375 563.500 563.625 563.750 563.875
29 564.000 564.125 564.250 564.375 564.500 564.625 564.750 564.875
29 565.000 565.125 565.250 565.375 565.500 565.625 565.750 565.875
30 566.000 566.125 566.250 566.375 --- --- --- ---
US UHF WIRELESS OPERATING FREQUENCIES
Avoid using same frequencies as TV channels or other radio signals for better performance.

19
Band D: 655.500 - 680.375 MHz
TV Ch.
44 --- --- --- --- 655.500 655.625 655.750 655.875
45 656.000 656.125 656.250 656.375 656.500 656.625 656.750 656.875
45 657.000 657.125 657.250 657.375 657.500 657.625 657.750 657.875
45 658.000 658.125 658.250 658.375 658.500 658.625 658.750 658.875
45 659.000 659.125 659.250 659.375 659.500 659.625 659.750 659.875
45 660.000 660.125 660.250 660.375 660.500 660.625 660.750 660.875
45 661.000 661.125 661.250 661.375 661.500 661.625 661.750 661.875
46 662.000 662.125 662.250 662.375 662.500 662.625 662.750 662.875
46 663.000 663.125 663.250 663.375 663.500 663.625 663.750 663.875
46 664.000 664.125 664.250 664.375 664.500 664.625 664.750 664.875
46 665.000 665.125 665.250 665.375 665.500 665.625 665.750 665.875
46 666.000 666.125 666.250 666.375 666.500 666.625 666.750 666.875
46 667.000 667.125 667.250 667.375 667.500 667.625 667.750 667.875
47 668.000 668.125 668.250 668.375 668.500 668.625 668.750 668.875
47 669.000 669.125 669.250 669.375 669.500 669.625 669.750 669.875
47 670.000 670.125 670.250 670.375 670.500 670.625 670.750 670.875
47 671.000 671.125 671.250 671.375 671.500 671.625 671.750 671.875
47 672.000 672.125 672.250 672.375 672.500 672.625 672.750 672.875
47 673.000 673.125 673.250 673.375 673.500 673.625 673.750 673.875
48 674.000 674.125 674.250 674.375 674.500 674.625 674.750 674.875
48 675.000 675.125 675.250 675.375 675.500 675.625 675.750 675.875
48 676.000 676.125 676.250 676.375 676.500 676.625 676.750 676.875
48 677.000 677.125 677.250 677.375 677.500 677.625 677.750 677.875
48 678.000 678.125 678.250 678.375 678.500 678.625 678.750 678.875
48 679.000 679.125 679.250 679.375 679.500 679.625 679.750 679.875
49 680.000 680.125 680.250 680.375 --- --- --- ---
Avoid using same frequencies as TV channels or other radio signals for better performance.

20
TROUBLESHOOTING
1. SYMPTOM: RECEIVER HAS NO POWER.
If you press the power button on the receiver for more than 5 seconds, you
may use the wrong DC adaptor. There are two types of adaptor; AC adaptor
and DC adaptor.
2. SYMPTOM: NO SOUND
Before there was sound coming from the speaker, but now there is no sound.
Please check your cable connection or your battery.
When you change a new battery, but there is still no sound, the battery may
be placed in a wrong position inside the transmitter. Check the battery
position.
3. SYMPTOM: NOISE AND INTERFERENCE
If you connect the receiver audio out to the mixer for more than 10 feet, we
recommend you changing it to a balanced cable (XLR to XLR). It would reduce
the noises. It is also possible that you may use a wrong adaptor. The receiver
adaptor is in DC 14~16 and 480mA. The charger for the DC power is
9V~15V with a maximum battery capacity of 1800mA.
If you hear some noises from your speaker, but the microphone is off, it means
that two same frequencies are being used within 200 feet. Therefore, we
recommend you changing to a different frequency.
When the hand-held microphone is off, the RF should not brink to the
maximum level in your receiver.
4. SYMPTOM: POOR SIGNAL
Your receiver antenna is not connected properly. Therefore, we recommend
you extending the antennae to its maximum length.
Receiver is placed in the portable rack. When receiver and transmitter are
placed in different rooms made of concrete wall. This would cause poor
signal.
Your audio equipment is close to the police, fire or radio stations. In this case,
you need to change to a different frequency. The first step is to change to a
different frequency in the receiver. Then, change to a different frequency in the
transmitter.