UB-222 Wireless Boundary Surface Microphone
Model UB-222
Overview
The UB-222 is a wireless boundary surface microphone designed for conference and education applications where discreet, shared pickup of multiple speakers around a table is required.
Its cardioid condenser capsule with a wide pickup angle provides clear voice reproduction and effective rejection of off-axis noise.
UHF transmission with PLL and a wide RF band allows multiple systems to operate in parallel with high stability and low interference risk.
Technical specifications
Type
UHF wireless boundary surface microphone
Element
Fixed-charge back plate permanently polarized electret condenser
Polar Pattern
Cardioid, approximately 120° pickup angle
Carrier Frequency Range
470 MHz – 936.85 MHz (depending on region/version)
Modulation
FM
Oscillation
PLL synthesized
Harmonic Radiation
< 45 dBm
RF Bandwidth
134 MHz (depends on region)
Dynamic Range
> 95 dB (A-weighted)
Frequency Response
50 Hz – 17 kHz
RF Output Power
25 mW / 4 mW selectable
Maximum Deviation
±45 kHz
Volume Control
Audio potentiometer -10 ~ +10 dB
High-pass Filter
Switchable, 200 Hz / -6 dB
Battery
2 × AA
Current Consumption
≈ 130 mA (typical)
Battery Life
Approximately 9 hours
Dimensions
110 × 110 × 40 mm (W × D × H)
Weight
≈ 505 g
Construction
Low-profile metal body for table or surface mounting
Control/Integration
Microphone switch compatible with external central control systems or auto mixers
Applications
Conference rooms, meeting tables, classrooms, courtrooms, and training spaces
Compatible Systems
Relacart UHF receivers such as UR-230, UR-270, WAM-432, and other 222/230 series wireless microphone systems
Key features
- Low-profile boundary design for discreet placement on conference tables and podiums.
- Cardioid condenser capsule optimized for voice, with a 50 Hz to 17 kHz response and a wide pickup angle.
- UHF transmission with wide-band PLL (up to 134 MHz) and selectable RF power of 25 mW / 4 mW to adjust coverage and power consumption.
- Audio level control via a -10 ~ +10 dB potentiometer and a switchable 200 Hz high-pass filter to reduce low-frequency noise.
- Powered by 2 AA batteries with approximately 9 hours of battery life, suitable for full workdays.
- Compatible with Relacart UHF receivers and wireless mixers such as UR‑230/UR‑270 and the WAM‑432 system for professional AV integration.
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