Dual-channel true diversity wireless receiver UR-280
Model UR-280
Overview
The UR-280 is a dual-channel true diversity wireless receiver offering an ultra-wide 64 MHz bandwidth to operate multiple systems with minimal interference.
Its 1.14" color TFT display clearly shows frequency status, RF/AF levels, gain, lock state, and transmitter battery level.
The 1U chassis with balanced XLR outputs per channel and powered BNC antennas makes it ideal for fixed professional installations and mobile racks.
Technical specifications
Device Type
2-channel UHF true diversity wireless microphone receiver
Chassis Specification
Standard EIA 19" 1U rack
Reception Channels
Dual channel
Reception Mode
True diversity per channel
Carrier Frequency Range
521.25 MHz – 936.85 MHz (depending on region)
Frequency Stability
± 0.005%
Modulation Method
FM
Oscillation Mode
PLL frequency synthesis technology
Reception Sensitivity
5 dBv, S/N ≥ 60 dB at 25 kHz deviation
Channel Bandwidth
64 MHz (depending on region)
Maximum Deviation
± 45 kHz
Overall S/N Ratio
> 105 dB
Overall THD
< 0.7% @ 1 kHz
Frequency Response
50/60 Hz – 18 kHz ±3 dB (per product datasheet)
Effective Working Range
≈ 100 m in open field (typical conditions)
Antenna Interface
Dual BNC with +12 V / 150 mA output for active antennas/boosters
Audio Interface
1 × unbalanced mixed 6.3 mm jack output, 2 × independent balanced XLR outputs (one per channel)
Additional Outputs
Headphone/monitor output depending on front panel version
Display
1.14" high-brightness color TFT showing frequency status, group, dB, RF, AF, lock, and TX battery
Gain Control
Volume adjustment in 1 dB steps (‑15 to +5 dB)
RF Power For Transmitters
Fully compatible with transmitters at 3 RF power levels (typically 10 / 30 / 100 mW)
SQ / Squelch
Multi-level adjustable squelch threshold depending on RF environment
Additional Features
Frequency/channel scan with clean channel selection · IR synchronization with compatible transmitters (UH-280, UT-280) · Control lock mode to prevent accidental operation
Power Supply
DC 12 V / 1 A
Dimensions
410 × 206 × 43 mm (L × D × H)
Weight
≈ 2 kg
Applications
High-demand KTV, multipurpose rooms, hotels, conference rooms, houses of worship, and small to medium stages
Key features
- Dual-channel true diversity with 64 MHz bandwidth, suitable for configurations running many systems in parallel.
- Color TFT display with complete system information, including RF, AF, dB, lock status, and transmitter battery.
- Adjustable output gain in 1 dB steps (‑15 to +5 dB) to match the level required by external mixers and processors.
- Adjustable multi-level squelch (SQ) to optimize immunity to RF noise in different environments.
- BNC antenna interface with +12 V / 150 mA power output for use with active antennas or RF distributors.
- Robust 1U rack chassis with mixed jack outputs and balanced XLR outputs per channel for maximum connection flexibility.
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