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RC high-pass filter for active antennas

RC high-pass filter for active antennas
Powerful transmitters operating on medium and long waves may cause considerable interference in the reception of short-wave signals. A high-pass filter to suppress the interfering signals is, of course, the solution. Since, however, the active antennas to which such a filter must be added are normally out in the open, it is desirable to be able to control the filter remotely.
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