AC-CA-RG213U-B-20M — 50 Ohm RF coaxial cable, RG213U, 20m, black, MIL-C-17F

The AC ANTENNAS AC-CA-RG213U-B-20M coaxial cable is a 50 Ohm RF transmission solution compliant with MIL-C-17F. Designed for radio and high-frequency applications, including HAM HF, CB radio, and antenna power feeds, it features a 20-meter length and a black jacket. Its design targets low signal loss and high-voltage operation.

Design and Technical Specifications

This RG213U-type cable features robust construction. Its inner conductor is bare stranded copper, typically composed of 7 strands of 0.75 mm, with a nominal diameter of 2.25 mm. The dielectric is solid polyethylene (PE), with a nominal diameter of 7.25 mm. The outer shielding consists of a bare copper braid providing 95 % to 97 % coverage. The assembly is protected by a non-contaminating black PVC jacket with a nominal outer diameter of 10.3 mm to 10.4 mm.

Electrical Performance and Attenuation

The cable has an impedance of 50 ± 2 Ohm and a capacitance of approximately 100 pF/m. Its propagation velocity is around 66 % to 67 %. The inner conductor resistance is about 6 Ohm/km and the outer conductor resistance is 4.5 Ohm/km. The AC-CA-RG213U-B-20M maintains low attenuation, critical for signal integrity over long distances. Typical attenuation values are 4.5 dB at 50 MHz, 6.7 dB at 100 MHz, 9.9 dB at 200 MHz, 14.3 dB at 400 MHz, and 24.3 dB at 1 GHz per 100 meters. It supports a maximum operating voltage up to 5,000 V and operates within a temperature range of -30 °C to +70 °C for fixed installations.

Reliability and Applications

Compliance with MIL-C-17F ensures manufacturing quality for demanding environments. Its flexibility makes it suitable for mobile applications and installations requiring bends. Shielding effectiveness is typically greater than 55 dB between 100 and 900 MHz, reducing interference. This cable is suitable for outdoor use under specified environmental conditions.