TKG 640wireless microphone system.

TKG UR-4000 UHF 640-690MHz 4 mic wireless 4 channel wireless microphone system.

Carrier frequency band: UHF640~690MHz (optional)
Number of channels: dual channel / quad channel / eight channel
Modulation method: FM
Sensitivity: When inputting 6dBv, S/N>60Db
Bandwidth: 30MHz
Maximum offset: ±45KHz
Comprehensive S/N ratio: >105dB
Comprehensive T.H.D: <0.7% @1KHz
Comprehensive frequency response: 45Hz~18KHZ ±3dB
Power supply: DC 12V 10W
Output socket: XLR parallel and 6.3 non-parallel seats
Receiving distance: about 300 meters
Transmission technical parameters:
Carrier frequency band: UHF640~690MHz (optional)
Oscillation mode: PLL phase lock frequency synthesis
Harmonic radiation: <-65dBm
Maximum offset: ±45KHz
Frequency response: 45Hz~18KHZ ±3dB
Band width: 120MHz
Head: Capacitive
RF power output: 15MW
Battery: AA*2
Current consumption: <90mA
Continuous working time: 12 hours

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