DCI bandpass filters will reduce the strength of interfering signals while allowing the signals you want to hear to pass through at virtually full strength. Benefits of a DCI Bandpass Filter Eliminate the random squeals, squawks, beeps, and strange voices from your VHF or UHF radio. Improve receiver sensitivity. Allow you to hear the signals you want to hear, even in crowded urban centers with strong police and paging systems. Features of a DCI Bandpass Filter Filters are totally passive and do not require DC power.
Filters accept full transmitter power and reduce spurious emissions.
Filters are made of extruded aluminum, copper and brass. There are no components inside to burn out or fail. Teflon is a registered trademark of DuPont. A handheld radio usually operates properly with a rubber duck antenna, but when it is connected to a mobile or base antenna, the HT becomes susceptible to intermod. This happens because some of the signals become strong enough to drive the RF amplifier non-linear.