VLF, It feels good to be back on the well audible frequencies. Finally i'm running a carrier on 5170.005 Hz again, since 21:30 UTC. The target antenna current is 300 mA, the actual level is arround 2
Results from the sites I have signal data for: Todmorden (881.2 km) -- 23/24 Eb/N0 +10.6 dB phase 43.4, *Decoded* 24/25 Eb/N0 +11.8 dB phase 45.7, *Decoded* 25/26 Eb/N0 +3.4 dB phase 32.8, *Decoded*
Thanks for that summary Paul. Especially the good SNR at IK1QFK is impressing! He will have no problem to receive the following 12 character message i guess, when stacking 2 or 3 days. So far i trans
Now with the 4th night. Good phase and amplitude repeatability, except at Todmorden. The repeats should stack very well. Todmorden (881.2 km) -- 23/24 Eb/N0 +10.6 dB phase 43.4, *Decoded* 24/25 Eb/N0
Am 27.12.2017 15:20, schrieb Paul Nicholson: As you can see, the problem with H S/N at this frequency is still there. I can say with confidence it is not the rx and probably not the antenna. So what
5 transmissions are completed now. I expect this is enough to leave a clear decode at RN3AUS. Alex' txt files will be invaluable this time :-) They may contain the messages of VO1NA, W4DEX as well as
Hello Alex, Thanks for the reception and the files. Unfortunately the message is not correct. I analysed your files and found the message at: 23rd: -8.0 dB 24th: -5.0 dB 25th: -6.2 dB 26th: -10.0 dB
Transmission stopped. Alex will do a restart of the PC tomorrow. A longer FFT input size will be choosen so i can run a longer transmission. For this night, i run a short test message, just to check
Hi Stefan as a "local" crosscheck, I had a look at your 3-character transmissions from DL0AO. Here are carrier Eb/N0 and "initial reference phase" from the EbNaut decoder's log files: Files 5k17W_12d
Hello Markus, thanks for the useful local cross-check. Yes, the phase of the 27th differs a bit from the others from your side. But this is still in the normal range i think. Maybe it is the rain th
Great results from Stefan, Paul, Jacek, Renato and Wolf; especially interesting because in general groundwave/skywave interference phase noise should be comparatively high at 5170 Hz / 303.8 km, and
Todmorden (881 km) -- Eb/N0 +12.1 dB phase 50.3 *Decoded* Bielefeld (303.8 km) -- Eb/N0 +19.0 dB phase -51.9 *Decoded* Cumiana (504.6 km) -- Eb/N0 +3.0 dB phase 171.0 *Decoded* Warsaw (919.3 km) -- E
Thanks Paul for that overview. Very nice! A few times i thought about providing a VLF stream from Heidelberg. This is a project for the next year. Not even a very big project. A simple Raspi could be
I would welcome additional GPS timed streams, especially if they are not close to existing receivers. Would particularly like to see some high latitude sites. All you need (apart from a fairly good r
Thanks Paul for the summary! Well, you may have noticed that the tree has some problems. The WLAN link is not working correctly. In the Raspi (AP) log files i can see that it connects and disconnects
Yes the advance of the phase was statistically significant at both sites. Was wondering what had changed! Well done for accounting for that. Not enough change to affect the stacking of repeats. But,
Stefan and Paul, Nice work! A technical question: I notice ~ 9dB lower Eb/N0 than the 1-character December 28th result (in Todmorden and Bielefeld); is this essentially from an approximately 12x incr
N0 is the noise density, completely independent of the transmission. It boils down to Eb, the signal energy per info bit. Eb is proportional to the overall message duration, and inversely proportiona
