Hi Jay, VLF,
An excellent achievement below 9 kHz! And even from a single night,
without stacking!!! I expected we will need about a week, or even more.
To leave a carrier trace or even a message decode over that path, from
east to west, was one of the goals during the kite experiments in
2010/2011, where my ERP was 20 dB higher. We mever managed that. Until
now!
So maybe the E>W path is less than 20 dB harder. That opens the door
for more imaginations about VLF DX, not only for me.
We need to proove that this is reproducable :-) So let me try a 2
character message starting this night:
f = 8270.1000 Hz
Start time: 19.FEB.2018 22:3:00 UTC (daily)
Symbol period: 30 s
Characters: 2
CRC bits: 22
Coding 16K21A
Duration: 07:12 [hh:mm]
Antenna current: 700 mA
In the attachment one can see the results put out by the Linux decoder
running on the file you sent me this morning. Only right decodes and
improving rank.
Can we really expect 2 characters in 2 days? We will see! Let's go!
73, Stefan
Am 19.02.2018 15:41, schrieb [email protected]:
Stefan's transmission:
f = 8270.1000 Hz
Start time: 12.FEB.2018 22:32:00 UTC (daily)
Symbol period: 32 s
Characters: 1
CRC bits: 24
Coding 16K21A
Duration: 07:06:40 [hh:mm:ss]
Antenna current: 700 mA
After a week of trying ... including two nights with TX
problems, one night with RX problems and one night with high noise
levels ... a successful decode of Stefan's message was made on last
night's transmission. s/n in 39 uHz 10.5 dB and Eb/N0 2.54 dB. It was
pretty convincing as the decode popped up in the 0,0,0,0 phase trial
and only improved thereafter.
Congrats Stefan on what appears to be the first E>W T/A on
Dreamers Band!
Jay W1VD
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W1VD_1st_sub9kHz_TA_1chEbNaut.jpg
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