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| Subject: | Re: LF: Re: EbNaut tests 137.490 kHz |
| From: | Markus Vester <[email protected]> |
| Date: | Sat, 10 Dec 2016 07:28:30 -0500 |
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Thank you very much Domenico! Your feedback is especially valuable as I've been playing with a modified version of the SpecLab 1pps-PLL for audio generation which can switch the phase even faster.
BTW the transmit timing here is a rather inhomogeneus mixture: - the LO of the homemade LF-Grabber TRX is derived from a permanently running FE5680A Rubidium at ~ 21.39475 MHz, which has indirectly been calibrated against Russian Loran, - the 1490.0175 Hz audio frequency is controlled by GPS 1pps, - the symbol timing comes from the PC-clock controlled by ntp1.fau.de, which is based on a DCF77 receiver at the Erlangen University. ... I have to simplify that setup sometime in the future ;-) Yes Gizmo and I are hoping to make it across to Joe (VO1NA) one of these nights. I think he is currently in the process of setting up frequency and samplerate calibrations. Here in Europe those steps may be easier, because we have a "critical density" of Ebnauteers who can play reasonably strong test signals between each other. On the other hand, I think that e.g. John (W1TAG), Jay (W1VD) and others have also been able to receive and transmit signals with absolute time and frequency calibration. All the best, Markus (DF6NM) -----Ursprüngliche Mitteilung----- Von: Domenico IZ7SLZ <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Sa, 10 Dez 2016 11:27 am Betreff: Re: LF: Re: EbNaut tests 137.490 kHz Hello Markus and group, here the results of your EbNaut transmissions obtained in JN80nu (qrb 1000 km)20.00 71.6 0% 1s/sym 21.00 71.6 0% 1s/sym 22.00 71.6 0% 2s/sym 23.00 71.6 0% 2s/sym 00.00 71.6 0% 2s/sym 01.00 71.6 0% 2s/sym 02.00 71.6 0% 2s/sym 03.00 71.6 0% 2s/sym 04.00 15.7 1.2% 2s/sym 05.00 71.6 0% 2s/sym 06.00 2.8 30% 2s/sym foff=-0.0002 Hz 07.00 6.7 21.2% 2s/sym foff=+0.0001 Hz wav files recordered have been uploaded in the folder http://qsl.net/iz7slz/DF6NM. They can be used from anyone with the program EbNaut-rx.exe using nominal offsets (-10 Hz; 242.05 s). Maybe your message has reached VO1NA. 73, Domenico iz7slz On 10 December 2016 at 01:09, Domenico IZ7SLZ <[email protected]> wrote:
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