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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Sub\-9kHz\s+walkabout\s+tests\s*$/: 2 ]

Total 2 documents matching your query.

1. LF: Sub-9kHz walkabout tests (score: 1)
Author: Roger Lapthorn <[email protected]>
Date: Tue, 11 May 2010 11:06:30 +0100
This week I've restarted tests using 3-4W into my 10m spaced grounded electrodes at 1-9kHz. On receive I'm using an 80cm loop into a Sallen-Key active HPF followed by 3 stages of audio gain into a cr
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00084.html (12,691 bytes)

2. Re: LF: Sub-9kHz walkabout tests (score: 1)
Author: Horst Stöcker <[email protected]>
Date: Tue, 11 May 2010 12:29:41 +0200 (CEST)
Hello Roger, this may work in the flat field. Here in the city a 30m earth base worked worse than my unmatched 10h/20t T-Antenna. With this the signal was audible in 100 to 200 m (about 300W at 8,9kH
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-05/msg00576.html (14,382 bytes)


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