This article is written about the difference between Xianglong's A25 military and H-250 handset according to some investigation of the internal structure of the H-250 handset from Internet.
1. Required functions that written on specifications of the H-250.
The H-250 has been produced by various manufacturers, and delivered to the US military, so the products must be produced according to required specifications and pass a functional inspection.
Part of a document published online that shows the H-250 handset specifications required by the US Department of Defense (published in 1977)
2. Required performance specifications of the H-250/ A25
|Speaker impedance:||1000Ω (@1kHz)||1000Ω (@1kHz)|
|Microphone impedance:||150Ω (@1kHz)||150Ω (@1kHz)|
|Microphone output level:||More than -56dB(@1kHz)||-59dB(@1kHz)|
|Distortion:||Less than 5%(300Hz~3500Hz)||Less than 5%(200Hz~4000Hz)|
|Operating temperature range||-20℃~65℃||-45℃~55℃|
|Water resistance:||Remains fully function after submerged in 3 feet (91cm) of water for 2 hours||Remains fully function after submerged in 1 meter of water for 2 hours|
|PTT switch durability:||More than 2 million actuations||More than 2 million actuations|
Calculated microphone frequency characteristic
Vibration and drop test to confirm performance quality specifications, including electric characteristics, are mandatory.
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