The AMRAD Active LF Antenna

September 2001 31 TBy By By By By Frank Gentges, KFrank Gentges, KFrank Gentges, KFrank Gentges, KFrank Gentges, K BRABRABRABRABRAhe Amateur Radio Researchand Development Corporation( AMRAD ) is a nonprofit radio clubthat specializes in cutting-edge yetfun Amateur Radio technology. In ajump back to the future, several of usdecided to look into low-frequency radio(LF). Many European countries now havean Amateur Radio allocation at 136 kHz,and AMRAD , hoping for a future FCCamateur allocation there obtained anFCC Part 5 license to operate experimen-tally on those challenging low frequen-cies. Many hams wanted to listen to ourtransmissions, but lacked a suitable re-ceiving Antenna . The Antenna describedhere should do BackgroundThe evolution of our present antennahas a proud lineage. AMRAD memberDick (WA3 USG) Goodman s MonsterLoop is an excellent Antenna and met ourinitial Another member, Bill Farmer,W3 CSW, built a loop Antenna in his atticthat also performs Low-frequencyveteran Ken Cornell, W2 IMB, describedseveral Active antennas, including hisvaractor-tuned Active And engi-neering whiz Andre Kesteloot, N4 ICK,presented an even better design.

32 September 2001 the desired frequency connected to an active impedance-conversion circuit. An electrically short whip has a high output impedance.

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