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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*AW\:\s+LF\:\s+RE\:\s+Re\:\s+VLF_8\.79\s+kHz\s*$/: 4 ]

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1. Re: AW: LF: RE: Re: VLF_8.79 kHz (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Thu, 25 Feb 2010 14:58:52 +0100; Hello Andy, The equivelent length is 30 cm, representing about 2-3 pF. The buffer amp is using a J310 with a 1.5 M gate resistor. Using bootstrap techniques, one can achieve a very low input capacita; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-02/msg00091.html (10,229 bytes)
2. AW: LF: RE: Re: VLF_8.79 kHz (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Thu, 25 Feb 2010 12:29:28 +0100; This is one way to start but maybe the 50Hz and it's harmonics could cause problems to the soundcard? Maybe it is useful to apply a simple LC-bandpass and/or a resonated antenna (wire, L and parallel; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-02/msg00246.html (15,303 bytes)
3. Re: AW: LF: RE: Re: VLF_8.79 kHz (score: 1): Author: Andy Talbot <[email protected]>; Date: Thu, 25 Feb 2010 12:34:17 +0000; Yes, but what is the gain / antenna factor of your Miniwhip? Measuing -115dBm means little in itself, you need to convert this to a calibrated V/m form. IF the miniwhip were exactly 1m long and po; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-02/msg00306.html (12,653 bytes)
4. Re: AW: LF: RE: Re: VLF_8.79 kHz (score: 1): Author: "Roelof Bakker" <[email protected]>; Date: Thu, 25 Feb 2010 13:03:29 +0100; Hello Andy, I measured the noise on 8800 Hz received on my mini-whip. Receiver: SPM-30, BW = 24 Hz, noise level = -115 dBm The same measurement with a PERSEUS SDR and a bandwidth of 20 Hz revealed a; /rsgb_lf_group-archives/html/rsgb_lf_group/2010-02/msg00407.html (10,364 bytes)

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