1. Frequency range: 1920~1980 MHz 2. Frequency election: 2 3. Channel Gain: 0dB±1 dB 4. VSWR: Import:≤1.4 export:≤1.4 5. Fluctuation band: ≤1 dB(3.84MHz Working band) 6. Noise factor: ≤28dB 7. oscillator leakage: Import:≤-20 dBm/30KHz export:≤-50 dBm/30KHz 8. Nondestructive largest Input Level: ≥10 dBm 9. Delay: ≤4uS 10. Step frequency interval: 50 KHz 11. Working voltage: ++9V/1A ±10% 12. Monitor Interface: RS485 (DB9 male) 13. Work temperature: -25oC±2oC 14. Work humidity: ≤95%(Noncondensing)