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CATV TAP Data Sheet
CATV TAP can efficiently distribute HD signals from one HD signal source to various display terminals compatible with HD signals.
Additionally, it can amplify the HDMI signal to disperse the HDMI signal from high-definition devices such as DVD players, D-VHS players, and various HDTV devices into multiple synchronized and consistent signs that are high definition.
What is CATV TAP?
The CATV TAP device, which is also referred to as high-definition tap CATV, is a device that allows you to distribute a video signal source among various video signals effectively.
Signal Tap is a passive device that divides one signal into several channels. Commonly used are two way CATV TAPs, three way Signal Taps, four way Signal Taps, and six way Signal Taps. The most basic ones are two way Signal Taps and three catv Indoor tap. They can make up various other Cable TV Indoor Tap.
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How does CATV TAP work?
The basic idea behind CATV TAP will be to fairly disperse signals using impedance conversion matching circuits that comprise capacitors, resistors, and inductors to ensure the output signals at each end do not affect each other. They do not alter the movement that is at the input. However, tap CATV does have an attenuation effect.
The distribution portion of the signal power generated by CATV TAP is wired. catv Indoor tap is measured in decibels (decibel), a relative value like the common multiples we encounter daily.
For example, If a signal is evenly divided by 1/2, every sound is 0.5. Converted to decibels, this would be: lg0.5 (take the logarithm of 0.5) 10 x 3db.
In the theory of things, if the signal is split in two, the call will be reduced by 3 decibels.
However, in reality, the devices aren’t optimal.
So the actual attenuation is slightly more significant than the theoretical amount.
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What does CATV TAP do？
1. The tap CATV in cable TV can be utilized to disperse signals. For instance, three tap CATV is used to distribute a call across three channels. However, it can also cause distribution losses when distributing signals.
If we take the three-tap CATV as an example, the Distribution loss for this signal is six decibels, meaning that every channel in its signal is lower by 6dB than the signal strength of the initial one.
2. Its cabled Signal Tap not only has the task of distributing power signals; however, in addition to transmitting signals, it serves as an impedance matcher for the equipment connected to this port.
This is vital when it comes to high-frequency broadband networks.
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What is the difference between CATV TAP and CATV splitter?
The distinction between CATV TAP and CATV splitter:
1. The identification of the port on the tap CATV is IN out, IN, OUT. It is a two-part tap CATV.
2. The identification port of the CATV splitter is IN, OUT. The splitter is a splitter that has one to two CATV channels.
3. The signals of tap CATV are identical. For instance, 306 tap CATV indicates that there is a single inlet (IN) with three outlets (OUT). There are 6 DBs attenuated at each outlet is 6DB.
4.CATV splitter is able to be connected to and cascaded; however, tap CATV is not cascaded because the connection between tap CATV and CATV is severely weakened. The tap Catv connection has connected the cable to the TV following the amplifier. If more than two cables can connect to the TV, you should make use of the CATV splitter in the middle.
5. The primary distinction between the two CATV splitters and the tap CATV model is the output port for the TV is distinct. The output port that connects the CATV splitter to the television is called that of the BR ports for output, and the tap CATV output port is the output port for the TV.
6. Tap CATV spreads the signal evenly and is often found in cable TV. Three 4 six 8-tap CATV, or more.
7.The CATV splitter removes only a tiny portion of the traffic signal and then sends this to the power tap CATV part connected to the branch port, referred to as”the CATV splitter.
8. It is important to note that the CATV splitter is distinct. For instance, the 410 CATV splitter has the input (IN) with five outlets and just one (OUT) port.
The remaining four ports are BR (branch) ports. Attenuation for the BR port is 10DB, and the attenuation for an OUT port of 2DB. OUT port is two DB.
The insertion loss is. During installation, every output port on the tap CATV must be empty, or it could cause ghosting because of impedance mismatch.
In general, an impedance matcher is needed. For the branch ports for the output of the CATV splitter with specific levels, it does not matter.
9. Distribution/branches of distribution CATV splitter input and output aren’t identical. Tap CATV output, and the input level is totally the same.
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What does br in CATV TAP mean?
It is the BR part of Signal Tap is the branch output interface. catv Indoor tap is the branch interface to the wired CATV TAP.
It’s a collection of signals that are lower than the outport. How much lower will depend on the attenuation of branches.
The branch output values within the amp. The typical output is 204 (average work) and 112 (12 branches). ) output, and further.
Cable TV Indoor Tap, also known as high-definition CATV, is a device designed to divide the video signal source into several video signals effectively.
The high-definition signals generated by a single high-definition signal source can be distributed quickly to various display terminals that can handle high-definition signals.
Furthermore, it could amplify the HDMI signal, resulting in the goal of dispersing the HDMI signal from high-definition devices such as DVD players, DVC players, and other HDTV equipment into multiple, consistent HD signals outputs that are synchronized and.
The characteristics of the electrical components of catv Indoor tap generally comprise distribution loss Ls, port isolation (usually higher than 20dB) as well as output and input impedance (75O), and high voltage stand wave (less than), as well as the operating frequency band.
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What are the main features of CATV TAP?
CATV TAP has 1 input port and several output ports, 2 Signal Tap has 2 output ports, 4 way Signal Tap has 4 output ports, etc. During regular operation, each output port of Signal Tap is connected to the nominal impedance Impedance coaxial cable or terminating resistor; at this time, the input port of catv Indoor tap should present an input impedance equal to the nominal impedance, which is the matching characteristic that Signal Tap must-have.
When the multi-channel broadband TV signal is sent to the input end of the Signal Tap, the Signal Tap divides the input signal equally and then outputs the signal from the output port.
This is the distribution characteristic of the Cable TV Indoor Tap to the signal.
The characteristics are based on matching conditions. If the output ports are not checked (such as not connected to a matching coaxial cable), the distribution characteristics of catv Indoor tap are not established.
When a signal is applied to an outlet of the Signal Tap, as long as the input and output ports of the Cable TV Indoor Tap maintain a matching state, the movement added to the output port will only be sent from the input port, and the password will not appear in other output ports.
Similarly, other output ports will not appear alert when any different output port is added to a signal. This feature is called the isolation feature of catv Indoor tap (generally 20 ~ 40dB).
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Main performance parameters of CATV TAP
The main performance parameters of Signal Tap are:
(1) The number of output ports;
(2) Distribution loss;
(3) Output port isolation;
(4) Reflection loss;
(5) Pass frequency bandwidth;
(6)AC power supply capacity.
The number of output ports is intuitive and need not be explained.
Distribution loss refers to the difference between the level of each output port of CATV TAP (the level of each port is equal) and the level of the input port. The size of distribution loss mainly depends on the number of output ports. Suppose the internal components of catv Indoor tap are not considered. For various failures, the signal power Pi sent into the catv Indoor tap will be equally divided into each output port. If the output power of each output port is Po, it should be Pi=n×Po, where n is the number of output ports.
If the distribution loss is Ls, by definition:
The components in the Cable TV Indoor Tap always have a specific loss, which makes the actual loss of the catv Indoor tap larger than the value of the above formula.
The isolation between the output ports refers to the difference between the signal level at other output ports and the level of the added signal when a signal is added to one output port.
The isolation feature of Signal Tap provides an effective means to prevent interference between users. Even if a user’s TV has substantial local oscillation leakage, it will not be connected to another branch.
The physical meaning of the catv Indoor tap reflection loss is the same as that of other components in the cable TV system. Some manufacturers give the standing wave ratio of the Signal Tap or the error of the input impedance, which can also explain the matching state of the Signal Tap when it is connected to the line. From the perspective of the cable TV system, it is hoped that the reflection loss of the catv Indoor tap should be as significant as possible.
The above parameters are related to the operating frequency of the catv Indoor tap. When the frequency is too high or too low, the distribution loss and reflection loss, and isolation between the output ports will deviate from the average values. Therefore, the above parameters of the Signal Tap are required in the system. The requirements should be met within the operating frequency range.
What does CATV TAP do?
In the cable television system,Cable television Indoor Tap is one of the most commonly used passive components, mainly used to distribute user terminal signals in the cable distribution network.
It has two functions: evenly distributing one channel’s signal power to several channels (usually divided into two, three, or four tracks); 3-way or 4-way signals are mixed.
Among the two functions, the most used is the first, which is to distribute the power equally. Each output end of catv Indoor tap cannot be empty or short-circuited during use, and impedance matching should be ensured. Three Signal Taps are commonly used: two CATV TAPs, three Cable TV Indoor Taps, and four Signal Taps.
In practical projects, it is sometimes necessary to provide low-voltage power-frequency AC power to the front amplifier through cables, so a feed-type Signal Tap appears. This type of Cable TV Indoor Tap can pass a lower voltage 50Hz AC power.
From the perspective of appearance and structure, Signal Tap is installed in a metal box, and there are two main ways to connect: one uses F-type connectors, and both the input and output ends use F-type connectors. Domestic Signal Taps mostly use F-type connectors. The advantages of the type connector are that it is easy and reliable to install, and it is also easy to measure the level;
The other is to use line cards, and the cables are clamped by line cards, characterized by firm connection and low cost, but installation and testing are more troublesome. Some imported devices use this method.
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Test method for CATV TAP
To judge the quality of a CATV TAP, it must be tested. The instruments used for the test are the field strength meter and the TV signal generator. If there is no signal generator, the antenna socket can be used as the signal source to test. The leading test performance indicators are as follows.
Test of distribution loss
First, connect the input terminal of catv Indoor tap to the TV signal generator, and adjust the TV signal generator to the frequency to be tested. You can select two points in the VHF frequency band and two points in the UHF frequency band to connect the CATV One input terminal of the TAP is connected to the field strength meter, and the other output terminals are connected to 75 Ω resistors. Record the reading of the field strength meter at this time, which is recorded as UO.
Disconnect the Cable TV Indoor Tap from the TV signal generator, and use a field strength meter to measure the output level of the signal generator, which UI represents. Note that the working state of the signal generator cannot change when measuring the UI, so the loss of CATV TAP is: Ls= UI-UO(dB)
Repeating the above process several times can measure the distribution loss at each output.
The isolation test is similar to the distribution loss test method. First, connect an output end of the catv Indoor tapto the TV signal generator, click the field strength meter to the other output end, and connect the other ports (including the input end) connected to 75 Ω resistance, record the reading of the field strength meter at this time, which is represented by UO. Disconnect the catv Indoor tap from the signal generator, and measure the output level of the signal generator, that is, the input level of the Signal Tap, denoted as UI, so the isolation degree of the above two ports is: S=U’I-U ‘O
Test of the working frequency range
The test of the operating frequency range of Signal Tap is mainly to check its high-frequency characteristics. The specific method is to select several frequency points in the UHF frequency band (such as 470MHz, 600MHz, 860MHz, etc.) and measure the distribution loss of Signal Tap; respectively, you can judge its working frequency range.
For example, when two catv Indoor tap allocates a loss of 3.5dB at 230MHz, 4dB at 470MHz, and more than 6dB at 600MHz, it can be considered a Signal Tap in the VHF band.
The test of the standing wave ratio of catv Indoor tap is the same as the test of the standing wave ratio of other devices. Examining the standing wave ratio can use a frequency sweeper and a standing wave bridge.