Currently, the high-frequency head has been localized in China, with numerous manufacturers involved. However, there is no unified standard, and the quality of these devices varies significantly. Some newly produced C-heads are still installed using traditional methods, which may not ensure proper operation. As a result, digital machines can exhibit various abnormal behaviors. Although these issues may not always be considered true faults, they often stem from design or debugging flaws in the C-head. These problems can sometimes cause inconvenience during use, leading to unnecessary complications in the installation and tuning of the antenna feeder system.
One common issue is "local oscillator drift." This phenomenon occurs when the digital machine fails to receive a standard downlink frequency, even after multiple adjustments. The signal quality displayed is usually very low, and it remains unchanged despite attempts to fine-tune the antenna system. In some cases, the blind scan function might detect the program, but the frequency value shown does not match the expected one. To resolve this, you can adjust the local oscillator screw on the C-head or modify the local oscillator or downlink frequency settings in the digital machine's parameters.
Another issue is the "reverse polarization" phenomenon. Most dual-polarized C-heads have horizontally polarized pins aligned parallel to the isolator pins, while vertically polarized pins are perpendicular. When installing the C-head, it's typically set according to the needle arrangement. However, some C-heads have the opposite configuration. If installed conventionally, this can lead to weak or no signal reception. To fix this, simply change the installation orientation or adjust the polarization mode in the digital machine so that it matches the actual polarization pins in the C-head.
A third common problem is that the C-head can only receive horizontally polarized signals. This issue is often related to the polarization voltage generation and switching circuits in the digital machine. To determine whether the problem lies in the C-head or the digital machine, check if the polarization voltage (13V or 18V) is being properly generated. If the voltage is normal, the fault likely resides in the C-head. Inside the C-head, two separate low-noise amplifiers handle horizontal and vertical polarization signals. The polarization switch determines which signal is received based on the voltage level. If the switching point is set too low, the C-head may only receive horizontal signals, regardless of the digital machine's settings. To correct this, you can add rectifier diodes in series with the power supply line, which lowers the voltage slightly and allows the vertical polarization signal to be received correctly.
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