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1. LF: 8.76kHz earth mode and a mystery signal to ID (score: 1): Author: Roger Lapthorn <[email protected]>; Date: Sun, 14 Aug 2011 16:11:28 +0100; This morning I slightly changed my VLF low input impedance tuned preamp - tuned circuit Q and gain of the first stage increased by around 6dB. After lunch I did a test at 6km from home to see what ef; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-08/msg00393.html (10,762 bytes)

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