Cable TV Retrofit Questions about amplifiers

839MH is the highest frequency of your transmission network (beyond 800MH), in fact, your network bandwidth should be calculated and designed according to 1G to MH. 1 All amplifiers should be replaced with bandwidth above 860MHz.

2 The higher the signal frequency transmitted by the cable television network, the greater the transmission loss, which is called slope loss. Therefore, the feeder should be more than -15 (imperial 250), and an amplifier should be set up at 300m.

3. The slope of the amplifier should be adjusted well, so that the output level of the amplifier output from 75MHz to 869MHz passband is kept straight.

It is necessary to negotiate FM with the manufacturer of the cable TV set-top box, otherwise the set-top box will not be searchable. It is recommended to connect directly to the TV RF input port through the RF output port behind the set-top box, and search for those channels.

If the signal is not well tuned and unstable, re-adjust the amplifier, or change the signal frequency band to test. If it doesn't work, find a professional manufacturer to configure it, Shenzhen Dingshengwei electronic SOUKA digital front-end equipment, modulator and amplifier have detailed use and technical support.

The inner core is too thick, and it will not form a "lot of split signals", but all the joints need to be good, otherwise the effect of installing a TV signal amplifier is not obvious. After overhauling the line, if the signal is still weak, you need to install a TV signal amplifier.

The principle of cable TV amplifier is that the TV signal enters the amplifier module from the input terminal "in" input through the equalizer and gain adjustment attenuation potentiometer, and sends it to the next level or user branch distribution system from the "out" output, the equalizer has a fixed 6db 19db, and the equalizer is balanced.

First of all, if you install an amplifier or if there is a strong signal after installation, it will not affect the TV.

There are several possibilities for the occasional horizontal stripes on the screen: 1. The signal is too strong or the output impedance of the amplifier does not match the input impedance of the TV.

2 is that there is a bad contact phenomenon on your line.

3 There is a source of interference near you, sometimes the car passes by, and the spark of the car generator will also cause interference, you can check it yourself, first eliminate the latter two causes of interference, and then, only connect the center line of the amplifier output cable to the center of your TV antenna input socket, if the interference still exists, it is not caused by the strong signal.

If the interference disappears, it is due to an over-strong or mismatched signal.

The easiest way to weaken the signal and achieve matching is to go to the radio maintenance department to buy a small 75 ohm resistor (a few cents), disassemble the amplifier, and weld the resistor in parallel to the antenna amplifier output cable interface, and the problem will be solved.

Good luck!

If the signal is too strong, just connect a crossover behind the amplifier.

The inner core is too thick, and there are many signals that are separated? --Hehe, layman! There is an amplifier with a crossover, (one interface in, three or four interfaces out, and the internal amplifier). The effect is remarkable, you can give it a try!

Hehe, I'll answer you. First popularize the basic knowledge and use plain language. For example, the cable TV signal strength outside your room is 65dB (55dB can be watched normally under normal circumstances), but because the attenuation of the embedded line during your decoration is too large, it is only 30dB after testing (for example, it is equal to the attenuation of 35dB, and the attenuation is not more than 6dB under normal circumstances).

Then your 30db signal itself has a problem, adding an amplifier, just amplifying the problematic signal, and not substantially solving the problem.

I suggest that you wire it separately, if you are afraid of damaging the decoration, you can consider taking the air conditioning eye, which will not affect the appearance.

Hehehe, tinkering you might as well reinstall an affordable.