When that happens, the connector inside the radio is either of inferior quality or the installation method is wrong. A PROPER chassis-mount female UHF connector either has four mounting screws to prevent it from rotating . While there are also connectors without those mounting screws with a square side to their circular body, they must be mounted on a chassis with a hole of the same shape, and the chassis must be "hard" enough that the connector cannot rotate. Any connector that rotates when pliers are used to tighten or remove a mating connector is WRONG!

73, Jim K9YC

On Mon,4/3/2017 8:50 AM, George Thornton wrote:
Exerting too much force with PL259’s can put stress on the radio SO 239 
connectors, I have had some of the internal mounts work loose over time.


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