20:30 message found rank 35302: VO1NA ps [ 28 -30 -30 0 0] re-encode 188/512 ber 3.67e-01 Es/N0=-12.3 Eb/N0=0.0 at offset again T=+0.8, so far no better decode so could be the clock is no longer drif
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
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
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
This morning I threw together a keyer program for Linux PCs and Raspberry Pi http://abelian.org/ebnaut/ebkey.c On the RPi, install ntpd with (you might need to prefix these commands with sudo) apt-ge
That's a lucky result at -0.9 dB for this, the weakest coding on the menu. VO1NA at Todmorden, 2015-11-27/28, 8K19A 2 seconds 5 chars start Eb/N0 T offset 20:30 3.8 dB +1.0 21:00 5.9 dB +0.8 21:30 4.
The command looks fine, except the start time should be like -T '20151128 200000' Needs a space between date and time and a quoted string so the shell doesn't split it on the space. There's bug in v0
21:30 from Joe decoded, Eb/N0 = 2.1 dB through a half dead receiver. Swept a range of time offsets, found best decode at T = 0.0 It's working! -- Paul Nicholson --
Needs the extra apt-get mentioned earlier, apt-get install libncurses5-dev to install the missing header. A nuisance that Ubuntu doesn't include that one with all the other C headers. Battery on cha
VO1NA 2015-11-28/29 EbNaut 8K19A 2S 8C. No T sweep, assuming good clock. 21:30 2.1 dB 22:00 no decode 22:30 no decode 23:00 no decode 23:30 no decode 00:00 8.6 dB 00:30 2.1 dB 01:00 3.2 dB 01:30 -0.2
Sure, or maybe that ebkey program should have an option to control the key through another gpio pin? I've not tried that but I don't see why ebnaut-rx wont take a large T offset. You'd have to manual
I use http://abelian.org/vlfrx-tools for everything. The program vtcmp has an option for cross-correlation, you just give it a 2-channel input. For anyone interested, details follow... I have the LF
VO1NA 2015-11-29 8K19A 2S 5C 20:00 6.2 dB 20:30 7.0 dB 21:00 3.2 dB 21:30 1.4 dB 22:00 5.4 dB 22:30 no decode 23:00 8.7 dB vtmatch monitors a stream and does a continuous cross correlation against th
VO1NA 2015-11-29/30 8K19A 2S 5C 20:00 6.2 dB 20:30 7.0 dB 21:00 3.2 dB 21:30 1.4 dB 22:00 5.4 dB 22:30 no decode 23:00 8.7 dB 23:30 6.8 dB 00:00 no decode 00:30 5.4 dB 01:00 4.9 dB 01:30 no decode 02
I fixed vtmatch. I passed last night's signal through vtmatch and got a fairly decent set of spikes. I noticed a spike at 19:30 which turned out to be an un-announced VO1NA transmission which I decod
So far, nothing decoded since 09:30 but it's worth a try. Probably for daytime we'll need longer symbols, which will be a good test for your VK capability. -- Paul Nicholson --
