20:30 best result at T offset +0.6 found rank 20883: VO1NA ps [ 28 -30 -30 0 0] re-encode 175/512 ber 3.42e-01 Es/N0=-10.8 Eb/N0=1.5 Looks like the clock is no longer drifting. I'm having to use long
Ah... Now you've said that 2030 transmission was 800ms late, I went back and re-decoded it. Even better result - appeared almost immediately Andy On 26 November 2015 at 21:39, <[email protected]> wrote:
Too late for 20:00, nil of 21:30, but then a good one at 21:00, +1.3 dB, 1.2s offset. ... Prx > Ptx ? ;-) Andy your spectrogram nicely shows the 0.5 Hz wide "noise hump" from the modulated transmissi
21:30 peaks at offset T=+1.6 found rank 0: VO1NA ps [ 28 -30 -30 0 0] re-encode 124/512 ber 2.42e-01 Es/N0=-6.1 Eb/N0=6.2 We'll have to get that clock under control. Joe if you have a Raspberry Pi co
Too late for 20:00, nil of 21:30, but then a good one at 21:00, +1.3 dB, 1.2s offset. ... Prx > Ptx ? ;-) Andy your spectrogram nicely shows the 0.5 Hz wide "noise hump" from the modulated transmis
So far I got 2015 Nov 26 start Eb/N0 time offset UT dB seconds 2030 nil 2100 1.3 1.2 2130 3.9 1.5 2200 5.4 1.9 2230 7.4 2.3 Not the faintest trace in any spectrogram here. Paul I was just wondering w
Hi Markus, Good to see that the low power bits are arriving. The clock seems to be slow by 400ms which will be simple to fix, unless something else goes wrong. An output 12.21304 dB lower in frequenc
1579 ohms * (10 m / 36145 m) = 121 microohms Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel. Assuming your ante
A few more weaker decodes occurred here around midnight, ending before 1 UT. The spectrogram caught a short carrier around 0:20 UT (spectrum showing on https://dl.dropboxusercontent.com/u/26404526/Eb
Greetings all, Do we have a relatively stable, but not too strong 'carrier like' signal in the vincinity of 137 kHz, to get a rough estimate of the local QRM level (by comparing that signal's SNR wit
Hi Wolf, at our distance, DCF39 is on the order of 3 mV/m. Assuming a best-case daytime band noise of ~0.05 uV/m/sqrtHz, a sensitive antenna could thus produce around 95 dB SNR in 1 Hz bandwidth. But
Todmorden reception of VO1NA 2015-11-26/27, 5 chars 8K19A 2 second symbols. 22:00 7.4 dB +1.9 22:30 1.8 dB +2.3 rank 18999 23:00 6.3 dB +2.5 23:30 10.0 dB +2.8 00:00 3.2 dB +3.0 00:30 11.1 dB +3.2 01
Hi Markus, My aerial current is 170mA so 3.5 uW on 8.3 kHz! Nice Eb/No values, Markus. Getting ready to start EbNaut again, hopefully with the timing offset reduced. Intended start time 2000 UTC. CHU
Thank-you Paul, It seems the uno shut down after 0130. I was wondering why until realising it was only doing what it was told. It is now starting the 2nd sequence and should run all night. A RasPi is
First three decodes tonight: 2015 Nov 27/28 start Eb/N0 time offset UT dB seconds 2030 2.2 1.2 2100 -0.9 1.2 (after notching QRM) 2130 5.7 1.0 The delay seems to be constant now. The 21:00 sequence w
Impressive. That's within a decibel of the limit. The TX power is 30 watts. Less than 10 should give valid decodes.  First three decodes tonight:    2015 Nov 27/28 start Eb/N0 time offset
Here is the result list for VO1NA last night: 2015 Nov 27/28 start Eb/N0 time offset UT dB seconds 2030 2.2 1.2 2100 -0.9 1.2 (after notching QRM on 137776.98) 2130 5.7 1.0 2200 3.1 1.1 2230 4.5 1.2
1579 ohms * (10 m / 36145 m) = 121 microohms Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel. Assuming your ant
I did, but was too lazy to write a comment. After all the answer 121uOhm was correct :-) SO..... How come no one else spotted the equation worked out incorrectly :-)
Ok Andy, you're right, I forgot the squares. But then, citing your email from Nov 19: ...should 've been 2^2 / SQRT("), or not? Hee hee, one for you, one for me;-) 73's, Markus --Ursprüngliche Mittei
