The IR-300M is a hands-free infrared wireless microphone. It eliminates problems with interference or eavesdropping, allowing simultaneous use in adjacent conference rooms or school classrooms. Since infrared wireless microphone system uses a frequency band that does not interfere with that of the TS-800 and TS-900 series infrared conference system, both systems can be simultaneously installed in the same location.
Specification
Battery
IR-200BT-2 rechargeable battery for the infrared wireless microphone (option)
or AA alkaline dry cell battery (2 pieces).
Current Consumption
Typ. 250 mA (2.4 V, Power selector switch: N)
Typ. 340 mA (2.4 V, Power selector switch: H)
Infrared Emitter
Wavelength
870 nm (AM: Brightness modulation)
Modulation Method
Frequency modulation
Carrier Frequency
Channel A: 3.100 MHz
Channel B: 3.350 MHz
Transmission Distance
Approx. 20 m (65 ft) (Power selector switch: H, in an unobstructed space)
Approx. 15 m (50 ft) (Power selector switch: N, in an unobstructed space)
Tone Signal
32.768 kHz
Modulation Sensitivity
±4.8 kHz (1 kHz, when SPL of 84 dB is input)
Maximum Input Sound Pressure
120 dB SPL
Input Sensitivity Adjustment
Adjustment range: -9 dB to 0 dB (factory preset: 0 dB)
Microphone Unit
Unidirectional electret condenser microphone
Frequency Response
100 Hz - 12 kHz
Preemphasis
300 μs
Input
External microphone input (φ3.5 monaural mini jack)
Battery Operation Time
Approx. 8 h (when the IR-200BT rechargeable battery for the infrared wireless
microphone is used, Power selector switch: N)
Approx. 6 h (when the alkaline battery is used, Power selector switch: N)
