UHF ACTIVE CANCELLATION FILTER
Abstract
A UHF cancellation filter is described for use over the frequency range 200-400 Mc. The filter can reject CW interference by phase locking an oscillator to the interfering signal and adding the phase-locked signal in such a manner as to produce cancellation of the interference. A superheterodyne system is employed so that interfering signals as low as -80 dbm may be cancelled throughout the 200-400 Mc frequency range. By careful adjustment of the phase and amplitude of the cancellation signal, the interfering signal can be reduced as much as 60 db. The cancellation filter is designed for use in a 50 ohms system and is inserted between the antenna and receiver. When the cancellation filter is inoperative, the receiving system may be used in a normal manner with the filter remaining in the receiving system.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0486927
Entities
People
- J. A. Hart Jr.
Organizations
- Georgia Tech