HCX-3 portable magneto telephone Performance: 1 matching light are multiplexed lines. 800Hz telephone impedance is 800Ω ± 20%. Same model two phones to pass, in not more than 75dB Audio uniform noise conditions, communication distance up to 21 km away. 3 at a temperature of -40 ° C (using the cold battery) 750 ± 30 mmHg and temperature of +40 ° C - +50 ° C Pressure, relative humidity up to 98% of the environmental work reliably under. 4 All parts fixed in the rack into one, along with a phone in the housing, solid structure, to carry and easy to use. 5 phone volume: 222X195X107 (mm) 3 6 Weight: about 2.5Kg 65-1 portable magnet telephones product performance phone impedance nominal value of 800 ohms, the design selection line for light tracks, such as the use of ultra-light is double-track, side sound. 2 phone operating frequency band of 300-3400Hz. 3 Send reference attenuation: 3V battery voltage to +4.0 - +1.2 N. Receiving the reference attenuation -0.8 ± 0.25N. 4 in 75dB noise environment, to communicate with each other the same model phone call from the 24 km of light are multiplexed online. 5 bells Sensitivity: 30 km double-track conditions in the ambient noise level 75db and light, shake each other with the same type of telephone two generators, two meters can hear the sound of the bell. 6 machines Box: Thermoplastics from repression, durable. 7 Operating environment: Ambient temperature: -40 ° C - +50 ° C range. Relative humidity: up to temperature +40 ° C, relative humidity 95 +3% Atmospheric pressure: 760 - 780 mm water yin column height range changes