MIL-DTL-3643 Connectors, Coaxial, Radio Frequency, Series Hn, And Associated Fittings, General Specification ForThis specification covers the general requirements for weatherproof, series HN-radio-frequency, coaxial connectors and associated fittings. These connectors have a nominal impedance of 50 ohms, an operating voltage of 1,500 volts root mean square, and a nominal operating frequency range of 0 to 10,000 MHz \(see 6.1 and 6.3\).