Digital Devices high pass filter HPF85 / 5-1000 MHz

The high-pass filter HPF85 is designed to block frequencies below 85 MHz and allow only signals in the range of 85 to 1000 MHz to pass through. This is particularly useful in networks used for both data transmission and television signals, as it prevents low-frequency interference from entering the system. Compared to a bandpass filter, which selectively allows a specific frequency range while suppressing both lower and higher frequencies, the high-pass filter offers a simpler solution by merely blocking low frequencies and allowing all higher frequencies to pass unrestricted. This may be sufficient when the goal is only to remove unwanted low-frequency signals without precisely limiting the upper frequency spectrum.

When used with technologies like EOC1000, which operates in the frequency spectrum of 0 to 100 MHz, the HPF85 ensures that these low frequencies are effectively blocked. This prevents unwanted interference from this range, such as DOCSIS uploads, from affecting the network. At the same time, the filter allows frequencies above 85 MHz to pass freely, ensuring that essential signals used for downstream data transmissions and television broadcasting remain unaffected.

However, it is important to note that the HPF85 does not provide specific suppression of high-frequency interference above its passband. In environments where both low- and high-frequency disturbances are present, a bandpass filter could offer more precise filtering by allowing only the desired frequency range to pass while suppressing both lower and higher unwanted frequencies.

Please check the frequencies used by your cable provider to ensure that the HPF85 is suitable for your network environment.