With the progress of the times, there are more and more users watching TV programs using cable TV set-top boxes, but there is a place where cable set-top boxes are very unsatisfying - there are few television program channels. How to do it? Very simple, crack, below to share the latest tutorial on how to crack the cable set-top box.
Crack method one:
Place the cable set-top box near the tuner of one of the TV sets so that it can be viewed normally, and then use a branching device (which can be directly purchased online) to branch off the signal from the output to another TV (the two TVs at home are Use this method). There is a disadvantage to this approach: the other TV can only see about 5 channels.
Crack method two:
Using an off-or gate circuit or 555 circuit to create an open multi-vibrator (as shown below), its resonant frequency can cover the entire frequency band of cable TV. Place this vibrator next to the set top box. Let the set-top box receive the signal sent by the oscillator, and then use the splitter to branch out more than one TV from the output of the set-top box. In this way, all televisions can receive the signals of all channels (not recommended, extremely difficult to operate).
555 Tutorial for designing a multivibrator. The following figure is a more practical multi-harmonic oscillator circuit, the core component is 555, the simulation waveform is shown in the lower right corner of the figure below, the waveform of the physical measurement is as follows:
Multivibrator circuit
The main design point is that, using the charge and discharge of the capacitor C1, different levels are obtained, and the two comparisons in the 555 are flipped between different levels to provide an input to the RS flip-flop to output a resonant square wave. The output frequency can be calculated using the following formula: 1.44/(R1 + 2R2)C1.
This is a basic oscillating circuit. If necessary, it can be made into a physical object. It can be used as a square wave generator and the resistance can be adjusted with an adjustable resistor. The square wave generator with adjustable output frequency can be made. The figure below is actual PCB diagram for reference:
Crack method three:
Using a high-frequency transistor such as the 9018 as a high-frequency transmitter circuit, using the RF output to re-emit, as long as the small transmit power, so that the set-top box can receive it. Or use the coaxial video line branch access input or output, remove the outer shield, leaving only the middle of the line length of about 1 meter, this line around the set-top box. Let the leaked signal sense the set-top box to receive.
The above method of cracking several cable set-top boxes, I recommend the use of the first method, because it is more operative than other methods, the cost is low, it is worth a try.
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