What is the reason why the TV line is more expensive after installing a trunk amplifier

This kind of people all have one thing in common: most of the bars they pay attention to are provinces and regions.

1.You set it at channel 61, which is a bit high because the high frequencies are the most attenuated.

2.The distance of installing the amplifier is: -12 cable 400 m (100m loss 9db), -7 cable 350 m (100m loss 12db), -5 cable 250 m (100m loss 15db).

3.The output of 102db cannot be directly used by the TV**. The TV signal should not exceed 80-85db, or there will be a bar cross-modulation.

Do you have an amplifier output? How much?

If your amp input level is stable, then it must be an amplifier fault. It gives me the feeling that your amplifier is virtual soldering, try a new one. If troubleshooting, or the amplifier is not repaired. If you have all the amplifier accessories on hand, the amplifier can be repaired.

Module issues. Let's take a look at the module. I can't do it, I'll sell you a few. Definitely cheap.

Moisture or wear of the adjustment knob can also cause this failure. Try it differently.

Whether there is a problem with the input voltage, look at the voltage.

There is a good chance that this will happen. Lightning strikes vary in condition, current intensity, and damaged components. Most of the trunk (branch) amplifiers are resistor-capacitance circuits, and compared with the integrated circuits inside the TV, of course, the integrated circuits are quite fragile and vulnerable.

Yes, this situation is more common, generally there is a discharge tube inside the amplifier, which can resist a certain lightning strike, but if the lightning is relatively advanced, then it is not possible to avoid difficulties, and the damage to the TV line is generally due to the lightning passing through the shielding layer of the wired cable or the shell of the amplifier to the TV, so the general TV is also easy to cause the circuit board to burn and burn out.

The thicker the inner core, the smaller the loss.

If the signal is too small, it is usually caused by too long wire, poor wire quality, poor connector, too many taps, or poor contact between wires and connectors.

If the signal is already poor, it is useless to add an amplifier at this time.

So to solve the problem, it is still necessary to find out the real problem.

Of course, installing an amplifier is the easiest way, but the cost of this method is a little higher than other methods, and the effect is obvious.

Not necessarily, it depends on the signal strength of your line. The amplifier only acts as an amplification.

The amplifier must have an effect, and having a mosaic is mainly a manifestation of a weak signal.

If the signal attenuation is serious, you should be able to try it according to local conditions.

Installing an amplifier is not considered in the first place.

I am a cable TV customer service manager with many years of experience in troubleshooting, as you said, most of the situation is that there is a connector in the middle of the line, and the connector part is not connected according to the standard, resulting in signal attenuation.

You said that there is no plug, that is 60v, not 220v, and you have to use a power supply. I don't know if the dry discharge you bought is a switching power supply, if you can change it, some switching power supplies can be changed to 220V, and it is no problem to change the ordinary power supply.

The cable TV trunk amplifier is connected to the power supply like this:

There are two types of cable TV trunk amplifiers:

One is a feed-through amplifier, which feeds 60V alternating current from the cable of the cable TV line to the next stage or more. The trunk amplifier is powered by the power supply in the computer room or the power supply in the middle of the line, which is a way for the trunk amplifier to connect the power supply;

One is the self-powered type, that is, the direct input of 220V alternating current, and the cable of the cable TV line is only responsible for transmitting the signal. This is where the discharger takes the power supply, which solves the problem of connecting the mains amplifier to the power supply.

The feed-in amplifier can be supplied forward or backward along the line, and a power inserter is required for the midway power supply.

You're buying a crossover.

The crossover doesn't use a power supply, in is the signal in, out is the signal out, and it's okay not to connect the wrong one, and the cable TV trunk amplifier is turned on to see if there is a transformer.

The transformer was found, and there was a fuse in front of it, which was a 220 power supply.

It is very easy to change, replace the original 0 60V 27V transformer with AC220V 27V transformer, and it can be used normally.

It depends on the module inside your amplifier. If it is a large module such as 8635, use 220V to 16V, and use 220V to 27V for small modules.

I usually add a 220 rpm 60 transformer.

In fact, the amplifier works with 12 or 24V direct current.

It is possible to add isolation transformer and voltage transformer.

Reply to Qingdao Haiqing Green Tea:

Cable TV Signal Amplifier Model: 20dg3 What should I do if I can't get a circuit diagram on the Internet?