System indicators RF range: 640.25 --690.00MHz (A channel: 640.25MHZ---665.25MHZ, B channel: 665.50MHZ---690.00MHZ) Available bandwidth: 25MHz per channel Modulation method: FM frequency modulation Number of channels: Infrared automatic frequency pairing 200 channels Operating temperature: minus 18 degrees Celsius to 50 degrees Celsius Squelch mode: automatic noise detection and digital ID code squelch Offset: 45KHz Dynamic range: >110dB Audio response: 60Hz-18KHz Comprehensive signal-to-noise ratio: >105dB Comprehensive distortion: <0.5% Receiver Specifications: Receiving mode: double frequency conversion super heterodyne, double tuned true diversity reception Oscillation mode: PLL phase locked loop IF Frequency: First IF: 110MHz, Second IF: 10.7MHz Antenna interface: TNC seat Display mode: LCD Sensitivity: -100dBm (40dB S/N) Spurious suppression: >80dB Audio output: Unbalanced: +4dB(1.25V)/5KΩ Balance: +10dB(1.5V)/600Ω Power supply voltage: DC12V Supply current: 450mA Transmitter index: (908 transmissions) Oscillation mode: PLL phase locked loop Output power: 3dBm-10dBm (LO/HI conversion) Battery: 2 "1.5V5" batteries Current: <100mA(HF),<80mA(LF)