Incorrect size of the jack or pin of the inner conductor
If the hole diameter of the conductor in the jack is smaller than the specified size, when the pin of the conductor in the jack enters the jack, the jack will over-expand and deformation will exceed its elastic deformation range, resulting in plastic deformation, leading to damage to the conductor in the jack; on the contrary, if the diameter of the pin is too small, when the pin and the socket match, the gap between the pin and the wall of the socket is too large, and the two inner conductors of the rf coaxial connector cannot closely contact. If the contact resistance becomes large, the electrical performance index will also be poor.
Solution: The reasonableness of the fit of the socket and the pin can be measured by the insertion force and holding force of the conductor in the standard gauge pin and socket. For N type connector, the insertion force should be ≤ 9N when the diameter Φ1.6760+ 0.005 standard gauge pin matches with the socket, and the holding force ≥ 0.56 N when the diameter Φ1.6000-0.005 standard gauge pin matches with the conductor in the socket Therefore, we can use the insertion force and holding force as the test standard. By adjusting the size and tolerance of the jack and the pin and the aging process of the conductor in the jack, the insertion force and holding force between the pin and the jack can be adjusted to stay within the appropriate range.
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Analysis of the causes of rf coaxial connector failure and solutions(1)