EIA RF Connectors
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EIA RF Connectors are used to connect two items of high power radio frequency rigid or semi-rigid (flexline) coaxial transmission line. Typically these are only required in very high power transmitting installations (10s of kW to MW) where the feedline diameters may be several inches. One side of the connection is denoted as a male connection, or bullet, while the other side is denoted as the female connection, or cup. The Electronic Industries Alliance (EIA) are responsible for a number of standard imperial connector sizes.
The flange design, inner and outer conductor dimensions are standardized, by EIA, in the RS-225, 50Ω (ohm), and RS-259, 75Ω, standards. They are commonly referred to by the outer diameter of the outer conductor in fractional inches. Sizes covered under these two standards range from 3/8 to 6 1/8 inch outside diameter (OD) for 50 ohm and 3/8 to 3 1/8 inch OD for 75 ohm. Peak pulse power handling, driven by voltage breakdown, is more or less frequency independent for any given size (and can be deduced by assuming ~300V RMS per mm of inner to outer spacing), but the average power, limited by losses heating the centre conductors, increases approximately with the square root of the operating frequency. Commonly the limit is quoted as that dissipation that will raise the inner temperature to 100°C when the outer is maintained constant at +40°C. Field failures can occur at power levels well below this if the central bullet connections are not making uniform positive contact and free of contamination. Conversely the average power ratings can be significantly exceeded if there is forced air flow either through the inner conductor or through the void between the inner and outer conductors. Many years ago, the two RS standards were considered obsolete by EIA. Only recently (until 2007) there has been an effort by manufacturers in the US to update these standards.
- Exir Broadcasting
- Radio Frequency Systems
- Alan Dick
- Shively Labs
- JACAL conectores coaxil
- Myat Industries
- Electronics Research
- SPINNER GmbH
- SIRA srl
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