To: | [email protected] |
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Subject: | Re: VLF: Transatlantic success East to West |
From: | Paul Nicholson <[email protected]> |
Date: | Mon, 18 Dec 2017 17:56:53 +0000 |
Cc: | Michael Smith <[email protected]> |
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Results from eight overnight transmissions of the 3 character message: 2017-12-10/11 Eb/N0 = -13.1 dB 2017-12-11/12 Eb/N0 = -6.3 dB, phase 125.3 2017-12-12/13 Eb/N0 = -6.8 dB, phase 143.2 2017-12-13/14 Eb/N0 = -19.6 dB (stopped 03:40 by safety limit) 2017-12-14/15 Eb/N0 = -6.0 dB, phase 68.8 2017-12-15/16 Eb/N0 = -11.0 dB 2017-12-16/17 Eb/N0 = -14.6 dB 2017-12-17/18 Eb/N0 = -9.9 dB, phase 37.0 (stopped 04:19 by snow) Stacking 11/12 + 12/13 gives Eb/N0 = -3.6 dB. 11/12 + 12/13 + 14/15 gives Eb/N0 = -3.0 dB. 11/12 + 12/13 + 14/15 + 15/16 gives Eb/N0 = -2.5 dB. 11/12 + 12/13 + 14/15 + 17/18 gives Eb/N0 = -3.4 dB. There's some phase changing going on here which is making stacking not so effective. -- Paul Nicholson -- |
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