To: | [email protected] |
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Subject: | Re: LF: EbNaut test at 8270.00332 from JN64bw |
From: | Markus Vester <[email protected]> |
Date: | Sun, 17 Dec 2017 17:01:43 -0500 |
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Ric mentioned that he uses a DDS with /4 divider. That setup would only maintain absolute phase as long as it is running continuously without interruption. Best 73, Markus Von: Riccardo Zoli <[email protected]> An: LF Group <[email protected]> Verschickt: Mo, 11. Dez 2017 23:11 Betreff: Re: LF: Little TX test at 8270.00046 from JN64 ... I'm running with a GPSDO at 16384.0000kHz clocking a DDS AD9850. The output is divided by 4 (SDR quadrature generator). Tuning dword is 8671724. ... -----Ursprüngliche Mitteilung----- Von: Paul Nicholson <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: So, 17. Dez 2017 21:49 Betreff: Re: LF: EbNaut test at 8270.00332 from JN64bw > f = 8270.00332 Hz > Start time: 21:30:00 UTC > Symbol period: 30 s > Characters: 3 (repeated) > CRC bits: 24 > Coding 16K21A Decoded with Eb/N0 = +2.6 dB, rank 1, BER 41.6% Reference phase -120,-120,-150,-150. S/N -29.86 dB in 1Hz. Phase was -50.9 deg, previous nights were +19.1 and +35.7 degrees, has something changed the phase of the transmission? At Bielefeld, -9.0 dB; At Cumiana, -8.4 dB; (3 nights stacked = -4.2 dB, less than 2 nights stacked, phase did not repeat) At Warsaw, -13.8 dB; Good luck with the 2 char message, maybe that will decode at Cumiana. -- Paul Nicholson -- |
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