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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+RE\:\s+8270\.0025\s+Tuesday\s+Apr\s+19\s*$/: 5 ]

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1. LF: RE: 8270.0025 Tuesday Apr 19 (score: 1): Author: <[email protected]>; Date: Tue, 19 Apr 2016 16:55:08 -0400; Markus, Nice signal! A question perhaps for Paul or yourself follows: At ~0.22 fT (estimated from Paul’s spectrogram) I expected to see >> 10dB SNR in 278uHz. 10dB SNR is off scale so I looked; /rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00256.html (14,867 bytes)
2. Re: LF: RE: 8270.0025 Tuesday Apr 19 (score: 1): Author: Paul Nicholson <[email protected]>; Date: Wed, 20 Apr 2016 06:25:38 +0000; Another plot from the same pipeline, all same settings but with the sferic blanker removed http://abelian.org/vlf/tmp/160419b.gif DF6NM is lost in the noise without sferic blanking. Average noise per; /rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00257.html (10,529 bytes)
3. Re: LF: RE: 8270.0025 Tuesday Apr 19 (score: 1): Author: Markus Vester <[email protected]>; Date: Wed, 20 Apr 2016 04:07:11 -0400; Hi Jim, the transmit antenna is physically larger: The apex of the topload is at 21 m above ground or 12 m above our rooftop. But the wires are sloping downward at steep angles, and the antenna is pa; /rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00259.html (16,765 bytes)
4. Re: LF: RE: 8270.0025 Tuesday Apr 19 (score: 1): Author: Paul Nicholson <[email protected]>; Date: Wed, 20 Apr 2016 17:36:52 +0000; I should mention that for sferic blanking to be this effective it is essential to band limit the VLF before the blanker. A broadly optimum bandwidth is 3kHz centered on the signal frequency. Too wide; /rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00262.html (10,697 bytes)
5. RE: LF: RE: 8270.0025 Tuesday Apr 19 (score: 1): Author: <[email protected]>; Date: Wed, 20 Apr 2016 14:58:36 -0400; Paul, Thanks for the excellent and definitive insights. I will enjoy running the trials that you suggested (30-minute Speclab trial running now with 3kHz bandpass, hum filter, blanker, and test signa; /rsgb_lf_group-archives/html/rsgb_lf_group/2016-04/msg00263.html (12,040 bytes)

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