Tighten the connector to the appropriate value. The proper torque on the connector is required to help minimize PIM. Low torque will allow clearance of the center connector and PIM. High torque will again damage the center connector, resulting in PIM.
However, if it is necessary to connect and disconnect the same connector multiple times, the plugging cycle may be a problem. The manufacturer specifies the number of docking cycles they can guarantee.
Some devices cannot handle more than a few complete torque cycles and must be handled so that the equipment is not technically “wearing” prior to installation. A good example is the connector on the antenna panel. Few designs seem to be able to handle more than a few cycles before the connector base is released from the chassis. This usually causes the antenna to fail and is likely to have a suspicious line scan.
For 7/16 DIN connectors, 20 foot lbs is an acceptable value, and for N type connectors, 12 inch lbs is common. Some manufacturers may specify slightly lower values. If they do, please use the manufacturer's values. The recommended practice is to ensure that everyone who tightens the connector is equipped with a suitable torque wrench.
It is important to check the torque specifications with each manufacturer as they will vary slightly depending on the situation.