Frequency Range 136-174MHz & 400-470MHz 136-174MHz & 245MHz 136-174MHz & 450-520MHz. Memory Channels 128 channels Frequency Stability í+2.5ppm Operating Voltage 7.4V Operating Temperature -30íµí½+60íµ Antenna Impedance 50ª. Dimension 58í-105í-38(mm) Weight 250g Transmitter Frequency Stability í+2.5PPM RF Carrier Power UHF: 4W VHF: 5W Effective Radiation Power (ERP) within pre-determined value í+7.5dB Max. Frequency Deviation Channel Space: 25KHz í+5KHz Channel Space: 12.5KHz í+2.5KHz Audio Modulation +3dB (pre-emphasis by 6dB between 0.3-3KHz) Adjacent Channel Power Channel Space: 25KHz í¦70 dB Channel Space: 12.5KHz í¦60 dB Spurious Radiation í_-30dBm Inter modulation Attenuation í¦40dB Modulation Distortion í_10% Residual FM í_-35dB Residual AM í_3% Receiver Sensitivity (12dB SINADú¬ 0.16µV Squelch Rejection Sensitivity í_0.8µV Squelch Sensitivity í_0.2µV Audio Output power 500mW Audio Distortion í_5% Audio Response ú¿300-3000Hz) +1 to -3dB Co-channel Rejection í¦-8.0dB Performance of Amplitude Limiter í_3 Adjacent Channel Selection Channel Space: 25KHz í¦70 dB Channel Space: 12.5KHz í¦60 dB Inter-modulation í¦65 dB Resistance í¦84 dB Spurious Radiation 9KHz-1GHzí_-57dBm 1GHz-4GHzí_-47dBm.