In the construction or maintenance of cable TV coaxial cable, when the cable length is not enough and needs to be connected, the two sections of cable are generally connected with a double-pass connector (commonly known as a series connector). Because the operation at the connection is not standard, signal faults are common, and the common ones are as follows:
First, when the cable F head is inserted into the series connector, the spring sheet in the series connector is compressed and dislocated due to excessive force, which makes the cable core and the spring sheet have bad contact, especially the feed cable is easy to cause the leader to fire and cause signal failure.
Second, it is cable joint leave no margin, and the joint position any lien, long caused by cable heat bilges cold shrink or external force F head and the cable is loose, in line appears to be a straight line is easy to ignore, joint often wrongly for the cause of the problem, even when you check the joint also because there is no cable allowance need to do joint, of course more difficult.
Third, the cable margin is not enough or too much margin, binding is not firm. One way is to leave only a small margin to make the coil radius too small. In particular, f-12 cable is often ejected due to its large tension, so that the cable shielding layer is separated from the leader and the low-frequency signal becomes worse. The other is too much margin, a dozen coils of cable tangled together, easy to be shaken by the wind and thrown out.
The fourth is that the joint is not sealed with waterproof tape, and the signal level attenuation increases due to water oxidation.
According to the above situation, when connecting the cable, as long as the following method of operation, can basically eliminate the fault.
First, cable joints should generally be left beside the pole or roof Angle, such as convenient maintenance position, and leave enough margin (depending on different cable specifications not less than the minimum bending radius, can be generally coiled into 3~4 turns is enough), if not to reach the ideal position, then reluctantly cut off the residual cable, prefer to use several meters of cable connecting part.
Second, it is necessary to make the cable F head carefully. When inserting the F head into the series connector, it is necessary to gently push the F head into the spring chip and make sure that it is inserted normally before forcibly tightening the F head.
Third, the joint must first use self-adhesive rubber belt as a semi-lap type wrap as a waterproof seal, in its outer layer around a layer of PVC adhesive tape as a protective layer, in order to prevent water at the joint.
More than four is the cable tray into a circle, the camber is not less than the minimum bending radius of cable, then use iron binding wire into a bundle, at about 5 cm away from series connectors at both ends must all tie together, so can make the radian of joint and the camber pan yu spring to keep one, F head won't pop up for cable tension, finally to insert ring more than good cables in the electrical alignment pole frame or fixed on wall body does not swing.