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LOMEHO LO-U78

Lomeho 4 Channel VHF Wireless Microphone System LO-U78 User Manual

Model: LO-U78

1. Киришүү

Thank you for choosing the Lomeho LO-U78 4 Channel VHF Wireless Microphone System. This system is designed to provide unconstrained happiness and high-quality audio for various small environments such as audits, podcasts, small venue shows, karaoke, parties, and church events. It utilizes a VHF fixed frequency band (210-270MHz) to minimize interference and ensure stable performance. The system incorporates multilevel high-frequency and middle-frequency narrowband filters to dispel possible interference signals and special ALC circuitry to prevent sound loss at high volumes. All circuits use quartz crystal oscillating for steady frequency.

This manual provides detailed instructions for setting up, operating, and maintaining your wireless microphone system. Please read it carefully before use to ensure optimal performance and longevity of your product.

A PDF version of this manual is available for download бул жерде.

2. Пакеттин мазмуну

Сураныч, бардык буюмдар бар экенин жана жакшы абалда экендигин текшерүү үчүн пакетти кылдат текшериңиз:

  • Алуучу: 1 даана
  • Handheld Microphones: 4 pcs
  • Power Adapter: 1 pc
  • Anti-slip Rings: 4 pcs
  • 6.3mm to 6.3mm Audio Cable: 1 pc
  • English Instruction Manual: 1 pc
Image showing the complete packing list for the Lomeho LO-U78 system, including the receiver, four microphones, power adapter, audio cable, anti-slip rings, and manual.
2.1-сүрөт: Пакеттин мазмуну

3. Орнотуу

3.1 Microphone Battery Installation

  1. Turn the microphone switch to the "OFF" position.
  2. Unscrew the bottom part of the microphone to open the battery box cover.
  3. Insert two (2) AA 1.5V batteries into each microphone, ensuring correct polarity. (Batteries are not included in the package).
  4. Close the battery box cover securely.
Infographic showing the components of the handheld microphone, including the metal grille, power switch, battery holder, and plastic body, along with a diagram for inserting two AA 1.5V batteries.
Figure 3.1: Microphone Battery Installation

3.2 Кабылдагычтын туташуусу

  1. Connect the provided power adapter to the DC 12V 1A Power Supply Port on the back of the receiver and plug it into a suitable AC 100-240V 50/60Hz power outlet.
  2. Turn on the electrical switch on the receiver. The power indicator light should illuminate.
  3. Pull out both antennas (Antenna A & B) on the receiver and position them vertically for optimal signal reception.
  4. Connect the receiver's audio output to your audio mixer, ampкөтөргүч, же динамик системасы.
    • XLR Outputs (Balanced A/B, C/D): Use XLR cables (not included) to connect the receiver to an audio mixer. This allows separate control of microphone pairs (A/B and C/D).
    • Mix Out (6.35mm): Use the included 6.35mm audio cable to connect the receiver to an amplifier or speaker. This output combines all microphone signals, allowing only combined volume control.
Receiver rear panel with power adapter connected to the DC 12V 1A input.
Figure 3.2: Receiver Power Connection
Close-up of the receiver's rear panel, showing the Balanced A and Balanced B XLR sockets, the Mix Out 6.35mm socket, and the DC 12V 1A Power Supply Port.
Figure 3.3: Receiver Audio Output Ports
Wiring diagram showing how to connect the receiver to an audio mixer using XLR cables for individual control, or to an amplifier/speaker using a 6.35mm cable for mixed output.
Figure 3.4: Audio Output Connection Examples

4. Операция

  1. After connecting the receiver and installing batteries in the microphones, turn on the power switch on each microphone.
  2. When a microphone is turned on, the corresponding "RF" signal light on the receiver will illuminate, indicating a successful connection.
  3. Adjust the volume for each channel using the individual volume control knobs on the receiver.
  4. For temporary pauses, switch the microphone to the "STANDBY" position to prevent unwanted noise.
  5. The system has a working range of approximately 25 meters (30 meters if no obstacles). Ensure the microphones are within this range for optimal performance.
Фронт view of the Lomeho LO-U78 receiver and four handheld microphones, showing the RF indicators and volume controls on the receiver.
Figure 4.1: Receiver Front Panel and Microphones
Diagram illustrating the wireless working range of over 30 meters (98 feet) between the receiver and a user holding a microphone.
Figure 4.2: Wireless Working Range

Note on Frequencies: There are two groups of fixed VHF frequencies for this system, and the specific group shipped is random. If purchasing multiple systems for simultaneous use, ensure they have different frequency groups to avoid interference. If using systems with the same frequency group, maintain a distance of at least 100 meters between them to prevent interference.

Table showing two groups of VHF frequencies. Group 1 includes 223.1 MHz, 229.3 MHz, 243.4 MHz, 245.2 MHz. Group 2 includes 226.5 MHz, 231.8 MHz, 247.5 MHz, 249.7 MHz.
Figure 4.3: Available VHF Frequency Groups
Image showing the receiver and microphones with frequency labels (e.g., A: 223.10 MHz, B: 243.40 MHz, C: 229.30 MHz, D: 245.20 MHz) on the receiver's display.
Figure 4.4: Receiver Display with Frequencies

5. Техникалык тейлөө

  • Батареяны алмаштыруу: If the power indicator light on a microphone dims, replace the batteries immediately.
  • Узак мөөнөттүү сактоо: If the microphones will not be used for an extended period, remove the batteries to prevent leakage and damage.
  • Электр энергиясын өчүрүү: Always pull off the power plug from the receiver when not in use for a long time.
  • Айлана-чөйрөнү коргоо: Avoid direct sunlight, drenching, and strong electromagnetic waves. Do not place the receiver in a dead corner to maintain good signal conditions.
  • Физикалык иштетүү: Do not throw the microphones, as this can cause serious damage.
  • Тейлөө: Do not attempt to disassemble the unit yourself due to the presence of high voltage, which can be harmful.

6. Кыйынчылыктарды

Жалпы маселелер жана аларды чечүү үчүн төмөнкү таблицага кайрылыңыз:

БузулууСебепЧечим
Power indication light darkens when receiver power switch is onReceiver circuit is not connectedКубат адаптерин туташтырыңыз
Үн жокWireless microphone not turned to "ON" positionTurn microphone to "ON" position
Үн жокNo connection of receiver's audio frequencyConnect the audio cable circuit
Үн жокThe volume of receiver or ampкөтөргүч өтө төмөнTurn up the volume properly
Receiving distance is too shortDistance of wireless microphone and receiver is too farMove back to the service area
Receiving distance is too shortAntennas of receiver are not pulled outPull out the antennas
Sound worsensMicrophone battery power insufficientReplace the microphone batteries
Sound worsensPronouncing too loud and mouth too close to microphoneMaintain a slight distance from the microphone

If the issue persists after attempting these solutions, please contact your dealer for further assistance.

7. Техникалык шарттар

7.1 Жалпы спецификациялар

  • Жыштык диапазону: VHF 210-270MHz (Specific frequencies: 223.1-245.2MHz or 226.5-249.7MHz, shipped randomly)
  • Жыштыктын туруктуулугу: ±30ppm
  • Жыштык жообу: 75-12KHz
  • Динамикалык диапазон: >80дБ
  • Жалпы гармоникалык бурмалоо (THD): <1%
  • Signal-to-Noise (S/N) Rate: >80дБ
  • Иштөө температурасы: 0°C - 45°C
  • Service Areas (Working Range): 25 meters (30 meters if no block/obstacles)

7.2 Кабылдагычтын спецификациялары

  • Электр камсыздоо: AC 100-240V 50/60Hz
  • Энергияны керектөө: 1W
  • Сезимталдуулук: 30дБ/уВ
  • False Rate: >70дБ
  • Vicinity Rate: >70дБ
  • Аудио чыгаруу: >25мВ
  • Чыгуулары: 2 XLR balanced outputs, 1 x 6.35mm mixed output
  • Материал: Пластик куту

7.3 Transmitter (Microphone) Specifications

  • Өткөргүч кубаттуулугу: 8.5мВт
  • Модуляция режими: FM
  • Largest Modulation: ±75KHz
  • Power Voltage: 2 x 1.5V AA батарейкалары
  • Күч көрсөткүчү: Light darkens when battery is low
  • Стиль: Колдук динамикалык микрофон
  • Полярдык үлгү: кардиоида
  • Материал: Пластик

8. Колдонуучунун кеңештери

  • Жыштыктарды башкаруу: If you plan to use multiple wireless microphone systems simultaneously, it is crucial to select systems with different frequency groups to prevent interference. If systems with the same frequency group must be used, ensure a minimum distance of 100 meters (approximately 328 feet) between them.
  • Батареянын иштөө мөөнөтү: Always have spare AA batteries on hand for the microphones, especially during long events, as battery power can deplete quickly.
  • Оптималдуу жайгаштыруу: Position the receiver in an open area, away from walls or corners, and ensure antennas are fully extended and vertical to maximize signal strength and range.
  • Аудио туташуусу: For professional setups requiring individual microphone control, utilize the XLR outputs to connect to an audio mixer. For simpler setups, the 6.35mm mixed output is suitable for direct connection to an ampкөтөргүч же кубаттуу динамик.

9. Кепилдик жана колдоо

For any malfunctions not covered in the troubleshooting section, or if problems persist, please contact your original dealer or the LOMEHO Official Store for support. Do not attempt to repair the unit yourself, as this may void any warranty and poses a safety risk.