The 4002IFD diplexer is used for separating or combining satellite signals at 950 to 2150 MHz with VHF/UHF signals at 54 to 806 MHz. It includes high pass filter passing of 950 to 2150 MHz and low pass filter passing of 54 to 806 MHz. Additionally, a DC power pass is provided from the satellite port to the common in order to pass satellite receiver LNB voltage. The power pass feature passes DC through 22 KHz for polarization and satellite selection commands using 13/18 V, 22 KHz, Diseqc.
The 4002IFD diplexer offers high performance (much greater stopband rejection) which is necessary when COMBINING satellite and VHF/UHF signals on to one cable because LNB noise extends down into the UHF spectrum and can degrade (add noise to) UHF TV reception if not adequately filtered out before connection to the distribution cable.