1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of the MIPRO ACT 311B Wireless Radio System, which includes the ACT 311B Diversity Receiver and the ACT-32T Bodypack Transmitter. This system is designed for professional audio applications, offering reliable wireless performance and ease of use.
2. Product Overview
The MIPRO ACT 311B system consists of a single-channel diversity receiver and a compact bodypack transmitter. Key features include Automatic Channel Targeting (ACT) for quick frequency synchronization and robust signal transmission.
Figure 2.1: MIPRO ACT 311B Wireless Radio System. This image displays the complete system, featuring the ACT 311B Diversity Receiver at the bottom and the ACT-32T Bodypack Transmitter positioned above it. Both units are black with green LCD displays. The receiver has two antennas, while the transmitter has one flexible antenna.
Figure 2.2: MIPRO ACT 311B Diversity Receiver. A close-up view of the ACT 311B Diversity Receiver. It is a black, rack-mountable unit with a front panel featuring a green LCD display, control buttons (SET, ACT, MODE, UP, DOWN), and a power knob. Two detachable antennas are visible on the rear of the unit (shown here extending upwards).
Figure 2.3: MIPRO ACT-32T Bodypack Transmitter. This image shows the ACT-32T Bodypack Transmitter. It is a compact, black plastic unit with a green LCD display showing group and channel information. It features an ON/OFF button, MODE button, SET button, a flexible antenna, and a mini XLR input connector at the top.
3. Setup Instructions
3.1. ACT 311B Receiver Setup
- Power Connection: Connect the provided external power supply to the DC input on the rear panel of the ACT 311B receiver. Plug the power supply into an appropriate AC outlet.
- Antenna Installation: Attach the two antennas to the ANTENNA connectors on the rear of the receiver. Ensure they are securely fastened and positioned for optimal signal reception.
- Audio Output Connection: Connect the receiver's audio output to your mixer, audio interface, or PA system using either the symmetrical XLR output or the unbalanced 6.3mm jack output.
- Power On: Turn the POWER knob clockwise to power on the receiver. The LCD display will illuminate.
3.2. ACT-32T Bodypack Transmitter Setup
- Battery Installation: Open the battery compartment on the ACT-32T transmitter. Insert two AA batteries, observing the correct polarity (+/-). Close the compartment securely.
- Microphone/Instrument Connection: Connect your microphone or instrument cable (with a mini XLR connector) to the input jack on the top of the transmitter.
- Power On: Press and hold the ON/OFF button to power on the transmitter. The LCD display will show channel, gain, and battery status.
4. Operating Instructions
4.1. Automatic Channel Targeting (ACT) Synchronization
The ACT function allows for quick and precise frequency synchronization between the receiver and transmitter.
- Receiver Channel Selection: On the ACT 311B receiver, use the UP/DOWN buttons to select the desired group (GRP) and channel (CH).
- Activate ACT: Press the ACT button on the receiver. The display will show "ACT" and an infrared signal will be emitted.
- Align Transmitter: Position the ACT-32T transmitter's infrared sensor (usually located near the display) in front of the receiver's ACT window (infrared port).
- Synchronization: The transmitter will automatically synchronize with the receiver's frequency. The transmitter's display will update to show the new group and channel.
4.2. Adjusting Transmitter Settings (ACT-32T)
The ACT-32T allows adjustment of input sensitivity and RF output power.
- Input Sensitivity: Press the MODE button to cycle through settings. When "GAIN" or "INPUT SENS" is displayed, use the SET button to adjust the input sensitivity for your microphone or instrument. This optimizes the audio level and prevents distortion.
- RF Output Power: Similarly, navigate to the "RF POWER" setting. Use the SET button to select between 10mW and 50mW output power. Higher power (50mW) provides greater range but consumes more battery.
- Mute Function: The ACT-32T features a mute switch. Toggle this switch to temporarily silence the audio transmission without powering off the unit. The LCD will indicate the mute status.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surfaces of the receiver and transmitter. Avoid using liquid cleaners or solvents.
- Battery Replacement: Replace the AA batteries in the ACT-32T transmitter when the low battery indicator appears on the LCD. Always use fresh, high-quality batteries.
- Storage: When not in use for extended periods, remove batteries from the transmitter and store the system in a cool, dry place away from direct sunlight and extreme temperatures.
- Antenna Care: Handle antennas carefully. Ensure they are not bent or damaged, as this can affect signal quality.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No audio output from receiver. |
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| Poor sound quality or dropouts. |
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| Transmitter display is blank. |
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7. Specifications
| Feature | Detail |
|---|---|
| System Type | UHF Wireless Radio System |
| Model | ACT 311B (Receiver), ACT-32T (Bodypack Transmitter) |
| Frequency Range | 823-832 MHz |
| Bandwidth | 24 MHz |
| Frequency Stability | ±0.005% (-10~60°C) |
| Sensitivity | 10dBµV, at signal/noise distance > 80dB |
| Transmission Range | 50 Hz~18 kHz |
| Receiver Output Power | 2 selectable settings (microphone and line signal) |
| Receiver Connectors | Symmetrical XLR and Unbalanced 6.3mm Jack |
| Receiver Power Supply | External power supply |
| Receiver Dimensions (W x H x D) | 210 × 44 × 180 mm |
| Receiver Weight | 0.8 kg |
| Transmitter Synchronization | ACT Sync (Automatic Channel Targeting) |
| Transmitter Housing | Sturdy plastic |
| Transmitter Battery | 2 x AA batteries |
| Transmitter Operating Time | Up to 12 hours (with AA batteries) |
| Transmitter Output Power | 10mW/50mW adjustable |
| Transmitter Input | Mini XLR (for microphone/instrument) |
| Material Type | Plastic |
| Item Weight (Total) | 1.6 kg |
8. Warranty and Support
MIPRO products are designed for reliability and performance. For warranty information, please refer to the warranty card included with your product or visit the official MIPRO website. For technical support, contact your authorized MIPRO dealer or distributor.
Please retain your proof of purchase for warranty claims.
