Phase was looking good, until between 21:00 and 21:10 it did something, 2016-01-18_18:00:00 143.8 deg 2016-01-18_18:10:00 151.5 deg 2016-01-18_18:20:00 149.5 deg 2016-01-18_18:30:00 163.4 deg 2016-0
Depends on the available S/N. Give me half a cycle and you can have 20 digits... if the S/N is high enough. From 02:00 to 05:00 the average frequency was 8269.9999992 Hz +/- 0.1uHz. No decode. The si
In Todmorden, 22:00 to 01:00 averages 0.05 fT. S/N 16.3 dB in 1/10800 Hz using E and H, 11.0 dB using H only. Amazing how well a few uW does at a range of 1028 km. -- Paul Nicholson --
Both messages decode easily here with uniform phase and a couple of dB or so to spare, 13:35:01 rank 302 Eb/N0 +2.0 S/N 12.0dB in 1/3680 Hz 15:00:01 rank 13 Eb/N0 +3.3 S/N 13.9dB in 1/3680 Hz -- Paul
Your ebnaut messages always seem to decode reliably. Good timing, good oscillator, wise choice of symbol length, and that widget you use to maintain the phase of the antenna current probably helps a
What a rigmarole, having to edit the symbols text file. Well, easily fixed - sender version 0.3c http://abelian.org/ebnaut/win32/ebnaut-tx.exe -- Paul Nicholson --
I wasn't able to decode this one here. Signal calculator says it's probably a few dB too weak. You would have to use at least 40 second symbols with that code and message length. Better to use 20 se
Here's a DDS program for Linux PC and Raspberry Pi, http://abelian.org/ebnaut/ebsynth.shtml Intended for sending EbNaut but can be used as a standalone signal generator. I've been testing it in the n
I squared up the soundcard output with a Schmitt trigger and the 3rd harmonic of 45.9 kHz comes out very nicely at 137.7 kHz. Also the 7th harmonic of 68142.857143 Hz gives a nice pure note at 477 k
Decoded 'DF6NM' at Eb/N0 = +0.3 dB, BER 36.5% which is 67% of capacity. Carrier 10:25 to 11:25 UT had flux density 0.05 fT and S/N 11.4 dB using H-field alone. I combined with E-field to get a coupl
I must admit defeat on this one Markus. The signal is there but just a dB too weak to decode. The following carrier was 0.07 fT which is a decent signal but the noise was higher than the other day.
Unfortunately ebsynth struggles to work properly on the RPi, it just about functions on the quad core model 2. Seems the USB bandwidth just isn't up to doing full duplex stereo. I've never managed to
I got that one. Eb/N0 = -0.8 dB with a phase pattern 0 0 0 0 -0.7 dB with 30 30 30 30 +0.5 dB with 30 0 30 0 So I re-ran with a 15 degree search and got Eb/N0 = +0.8 dB with 15 15 15 15 which is a bi
Domenico, You may be able to copy a weak EbNaut transmission: Frequency: 477.695 kHz coding: 8K19A message: 12 chars symbol period: 1 second start time: 18:00 repeat: XX:30 and XX:00 until 20:45 mess
Thanks very much Markus. I'm surprised the signal is so strong and I would guess that Domenico has a good chance to decode. Eb/N0 from symbol errors is consistently about 3dB below the carrier S/N fo
No problem, that would only make a small difference to the error rate. Plenty of spare dBs on the decodes so not really much of a test of EbNaut but I'm happy to see EbSynth holding steady with the 9
Thanks Markus. That's a lot of work trying all those decodes, or maybe you have a script to automate the job? There's a lot of QSB on this band! Carrier off at 16:00:00 and QRTT for this band. That w
I can reproduce this using EbSynth and a weak near-field 9th harmonic signal. 2 to 3dB loss every time on a similar strength signal to last night's test. There is also an error floor showing up, abou
