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据《军事电子》杂志1989年10/11月号报道,Racal公司推出了两种战术话音保密机,MA4470和MA4777。 MA4470是模拟话音保密机,重量为1.75公斤,采用二维加密技术进行话音加密,用于VHF/UHF或者HF电台。
According to military electronics magazine October / November 1989, Racal has introduced two tactical voice security machines, MA4470 and MA4777. The MA4470 is an analog voice privacy machine weighing 1.75 kg and using two-dimensional encryption for voice encryption for VHF / UHF or HF radios.