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AMATEUR_TRANSMITTER_ABSORPTIVE_FILTER

2016-04-06 17:37  
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AMATEUR_TRANSMITTER_ABSORPTIVE_FILTER
This filter diverts harmonic energy above 30 MHz to a dummy load and dissipates it as heat instead of reflecting it back to the transmitter. The absorptive filter is based on the classic design by Weinreich and Carroll from 1968. The high-pass and low-pass sections are shielded from each other (even though they are in the same shielded box) to prevent interaction. If you want to try building this filter, wind the coils on high-powered toroids. Alternatively, you could wind an air-core coil using the nomograms in The ARRL Handbook for Radio Amateurs.