Amateur Extra › E7 Practical Circuits › E7C08
E7C08
Which of the following is most frequently used as a band-pass or notch filter in VHF and UHF transceivers?
Pick an answer to check it.
Answer: B. A helical filter
Helical filters are compact, high-Q resonators made from a coil inside a shielded can. They are widely used as band-pass or notch filters at VHF and UHF.
Tip: Helical filter: VHF/UHF coil in a can.