MiPro ACT-312 Receiver

MiPro ACT-312 — UHF Dual-Channel Diversity Receiver for Wireless Systems

This model is a UHF analog dual-channel diversity receiver designed as the receiving hub of a professional wireless microphone setup. Built around a 24 MHz narrowband circuit and antenna diversity, the receiver delivers stable, long-distance signal acquisition without dropouts, making it well suited for small educational events, conferences, houses of worship, and compact live-sound rigs. The half-rack metal chassis drops into a standard 19\" rack or sits on a tabletop, and the green backlit LCD keeps channel status readable on dark stages and in bright rooms.

Standout Features of the Receiver

What separates this unit from generic entry-level receivers is the patented ACT (Automatic Channel Targeting) sync by MiPro, which pairs the receiver to handheld or bodypack transmitters in seconds via infrared. A dual-squelch design combines a PiloTone pilot-tone lock with a NoiseLock noise floor circuit, and the front-panel RF interference indicator lets the operator tune squelch sensitivity for maximum range or minimum noise. Antenna connectors supply booster bias voltage, so the unit is fully compatible with external AT-series antenna systems for extended coverage.

RF Performance & Channel Capacity — Wireless System Stability

RF stability and channel density are the two parameters that decide whether a wireless rig survives a busy RF environment. The device covers UHF 480–934 MHz (country dependent) inside a 24 MHz bandwidth window, with PLL-synthesized oscillation and frequency stability of ≤ ±0.005% across -10 to +60 °C. Factory presets include 96 channels distributed across 7 groups, and a 7th user group stores up to 16 channels drawn from 961 available frequencies, giving operators room to dodge interference in multi-room deployments.

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• Frequency Range: UHF 480–934 MHz — country-dependent band selection for global touring and installed use
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• Bandwidth: 24 MHz — narrowband window that reduces harmonic interference and increases usable channel count
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• Preset Channels: 96 channels in 7 groups, plus 961 user-defined frequencies provide flexible channel planning for crowded RF environments.
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• Receiving Mode: Antenna diversity — two antennas switch silently to the stronger signal for dropout-free reception

Audio Outputs & Signal Routing — Mixer Integration

How the receiver hands audio off to the rest of the system matters as much as how it picks up RF. Each channel offers an independent balanced XLR output and an independent unbalanced 6.3 mm (1/4\") output, and a separate mixed XLR + 6.3 mm pair sums both channels for direct feed into a powered speaker. A three-level gain switch (+16 / 0 / -6 dB balanced; +10 / 0 / -6 dB unbalanced) lets the operator match the receiver output level to the mic capsule sensitivity of the connected transmitter, preventing distortion while preserving dynamic range.

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• Audio outputs feature independent balanced XLR + unbalanced 6.3 mm per channel, plus mixed XLR + 6.3 mm for flexible routing into mixers, amplifiers, or portable PA.
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• Frequency Response: 50 Hz–18 kHz — full-range vocal reproduction with high-pass filter
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• Dynamic Range: > 106 dB(A) — wide headroom for clean, undistorted vocal capture
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• T.H.D.: < 0.5% @ 1 kHz — low distortion preserves vocal clarity through the wireless chain

Physical Design & Power — Rack & Touring Build

The physical package is sized for permanent installation and portable rigs alike. The rugged half-rack metal chassis measures 210 × 44 × 165 mm and weighs approximately 0.9 kg, so two units can be mounted side-by-side in a single 1U rack space using FB-series rack-mount kits. Detachable rear-panel antennas use 50 Ω TNC female connectors with bias feed for booster antennas. Power comes from an external AC 100–240 V switching supply delivering DC 12–15 V at 3 W.

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• Chassis: Half-rack (9.5\") metal — EIA-standard 19\" rack-mountable, rugged for daily transport
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• Dimensions: 210 × 44 × 165 mm — compact footprint fits a 1U slot when paired with a second unit
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• Weight: approx. 0.9 kg — light enough for mobile rigs, solid enough for installed sound
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• Power Supply: DC 12–15 V via external AC 100–240 V switching PSU — worldwide mains compatibility with stable output under voltage fluctuation