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The connector reliably carries signals at frequencies up to 100 MHz. [1] The coupling shell has a 5 ⁄ 8 inch 24 tpi UNEF standard thread. [4] The most popular cable plug and corresponding chassis-mount socket carry the old Signal Corps nomenclatures PL-259 (plug) and SO-239 (socket). [12]
NMO mount connector (new Motorola mount), removable mobile antenna connector uses a 3 ⁄ 4 inch (19 mm) mounting hole and has a large base with a 1 1/8" – 18 tpi thread for attaching the antenna. SC connector, screw version of C connector [not to be confused with the fiber optic connector of the same name]
The thread is 8mm*0.75mm pitch, and the centre pin is 1.14-1.22mm diameter, with radiused end. There is an extensive array of FME inter-series adapters available and a male cable connector is also offered for both RG-58 and RG-174 type cables to facilitate extensions, splices or transitions.
The interface dimensions for SMA connectors are listed in MIL-STD-348. [5] The SMA connector employs a 1 ⁄ 4 inch diameter, 36-thread-per-inch threaded barrel. The male is equipped with a hex nut measuring 5 ⁄ 16 inch (0.3125 inch / 7.9 mm) across opposite flats, thus taking the same wrench as a #6 SAE hex nut.
SMC jack connectors have an external thread while SMC plug connectors have the mating hex nut. The contact dimensions are identical to the snap-fit SMB. Available in 50 ohm and 75 ohm characteristic impedance, they provide an interconnect means for small form factor coaxial cables (e.g. 50 ohm RG-174 , 75 ohm RG-179 ) and printed circuit boards ...
A rusty bolt in the structure of an antenna may create radio interference, even if it is not in the direct electrical pathway. Close-up of a pipe flange showing bolts affected by rust in an outdoor environment. Rusty bolts and clamps on an antenna mount experiencing the rusty bolt effect.
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