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HDX-1 Field Telephone
HDX-1 portable field telephone is suitable for wire communication which distance is over 21 km. It has a reliable and clear voice, It has the waterproof, shock and good electromagnetic compatibility performance.
Specifications
Environment temperature: -40 ~ ℃ ﹢55 ℃
Relative humidity: 95% when 40 ℃
Atmospheric pressure: 86 ~ 106 kpa
Power supply: 4.5 V (three R20 type battery)
Frequency: 16 ~ 30 Hz,
Amplitude≥50v (3 k ? load), duration time 1 ~ 2 s
Size: 240 mm x 110 mm × 50 mm
Weight: acuities were 1.7 kg