Digital Devices high pass filter HPF258 / 5-1215 MHz

The high-pass filter HPF258 is designed to block frequencies below 258 MHz and allow only signals in the range of 258 to 1218 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 such as the BPF266-682, which selectively allows a specific frequency range and suppresses both lower and higher frequencies, the high-pass filter offers a simpler solution by merely blocking low frequencies while allowing all higher frequencies to pass unrestricted. This may be sufficient if the goal is only to remove unwanted low-frequency signals without precisely limiting the upper frequency spectrum.

When used with technologies like EOC2000, which operates in the frequency spectrum of 0 to 200 MHz, the HPF258 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 258 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 HPF258 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 like the BPF266-682 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 HPF258 is suitable for your network environment.