Quote:
Originally Posted by shahrayar
Very low frequency circuit very good
Very sensitive to static electricity and electromagnetic fields
Lightning strikes may harm him
It has an insulation feature, but I don't know how
Possible help from engineers, such as developing the antenna
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it's active antenna for sound card VLF reception , it's not an LRL
https://www.qsl.net/dl4yhf/speclab/vlf_rcvr.htm