Cable system performance depends largely on the merits of the quality of the transmission line connecting the various joints , therefore , cable workers should be paid. Waterproof connector is a fairly common problem. Once a cable transmission system inlet connector happen , you can make the entire downstream signaling serious deterioration , or even can not send signals.

There are usually two inlet connector performance , one is lead to cable connector parts water water , causing the dielectric constant of the interlayer insulation layer change cable attenuation increases, especially for high frequency signals reflected at the client signal becomes high poor snow point increases, the performance of the amplifier in the trunk output level low or negative slope ( if it is tilted output, then ) ; another kind of performance is the joint water oxidation causes joints , especially of cable feed line , so that the power supply failure affecting the entire downstream amplifier work , accompanied slope becomes larger , the deterioration of signal quality.

Existing copper conductor cable is generally within the outer conductor wire or aluminum -magnesium alloy . The inner and outer conductors are oxidized in the air , especially in the water environment. Copper oxide can occur at room temperature and high temperature , to produce a black copper oxide and basic copper carbonate , commonly known as Pseudomonas , the basic copper carbonate can be decomposed at a high temperature copper oxide . Both oxidation products are electrical insulators and do not dissolve in water, feed and signal transmission for cable television transmission system has a significant impact .

Pseudomonas generated at room temperature , so that the joint between the inner conductor and the insulating layer is formed of an oxide film , can be considered an equivalent capacitance. High-frequency current through the lower frequency current is easier , the performance of both high and low end signal attenuation , but low-end attenuation is more serious. In the performance of low-end client level is low , there may be a variety of textured interference . While the presence of the conductive oxide layer is greatly reduced performance of the inner conductor of the cable voltage drop becomes large section , after the low level voltage , the lower the amplifier may not work correctly even work .

If the cable connector moisture or water , when the 60 V supply of the transmission cable between the inner and outer conductors readily discharged , a large amount of heat , the inner conductor occurs vigorous oxidation reaction to produce a black copper oxide. Copper oxide patina density larger than the low frequency signal attenuation larger , weaker inner conductor conductivity greater impact on the line , the change due to the presence of the inner conductor and the outer oxide layer, the dielectric constant and the radius of the inner conductor occurs , the cable severe impedance mismatch may be , it is possible to produce the right level in the ghost lines .

Outer conductor used magnesium alloy wire , aluminum and magnesium are relatively chemically active metal , water once the joints , inner and outer conductors discharge occurs , generate a lot of heat , will accelerate the corrosion of the outer conductor . Once the outer conductor causes serious corrosion signal attenuation becomes larger, the outer conductor conductivity dropped significantly , it is possible to grade the supply voltage is low , the amplifier is not working properly , or does not work.

Reduce network failures due to joints caused by water in general practice is to use waterproof connector. Because of the waterproof connector construction process more complicated , each manufacturer of the product varies greatly, uneven level of construction workers , and the use of waterproof connector for future repair and maintenance for the inconvenience, so in some places does not use waterproof connector , instead of using the ordinary F head. Due to poor ordinary F head waterproof performance , even with waterproof tape still inevitably occur joints water, for a total of cable feeder cable systems , it is a potentially significant risk. Some places use a simple method : Covers the installation , though this method is relatively primitive, but effective , to a certain extent, solve the problem of water fittings , but also brought the heat problem , because Covers are not intimate contact with the amplifier , reducing the amplifier heatsink outer layer of air convection , the amplifier operating temperature will be elevated , various performance indicators will inevitably decline. But on balance , the installation of a rain cover still has its merits , it is worth promoting.