Congratulations Jay and Stefan, and thanks Markus for the perspectives and reference points. I have a rough recollection of Stefan’s estimated ERP, which would seem to slightly more than offset a nominal E-W/W-E attenuation ratio, making Markus’ two propagation observations particularly interesting, as is the Forest question.

 

Fine work Stefan and Jay.

 

73,

 

Jim AA5BW   

 

From: [email protected] [mailto:[email protected]] On Behalf Of Markus Vester
Sent: Sunday, February 25, 2018 2:25 PM
To: [email protected]
Subject: Re: LF: VLF DK7FC > W1VD 8.27 kHz EbNaut more success!

 

Hi Jay, Stefan,

really good work, truly amazing!

Noticing that Stefan hadn't sent another repeat last night 24/25th, I wondered whether the experiment might have already been concluded successfully - yes it had ;-)

Considering that Joe has been making the TA W-E path with only 10 uW, in retrospective it seems not so surprising that Stefan's much stronger signal managed to overcome the E-W nonreciprocity. On the other hand, when Uwe had sent a very long carrier in March 2014, no conclusive trace was ever detected in Virginia. Now I wonder whether Stefan's recent transmission has also been picked up in Forest?

All the best,
Markus (DF6NM)  


-----Ursprüngliche Mitteilung-----
Von: jrusgrove <[email protected]>
An: ([email protected]) <[email protected]>
Verschickt: So, 25. Feb 2018 19:26
Betreff: LF: VLF DK7FC > W1VD 8.27 kHz EbNaut more success!

Stefans transmission:

 

f = 8270.1000 Hz
Start time: 19.FEB.2018  22:30:00 UTC (daily)
Symbol period: 30 s
Characters: 2
CRC bits: 22
Coding 16K21A
Duration: 07:12 [hh:mm]
Antenna current: 700 mA

 

After a successful one character reception earlier in the week, we can now report the successful reception of a 2 character message. Stacking of 3  transmissions was required (0221, 0222 and 0223). There is also a 0224 file but it has timing issues and may or may not be usable.

 

ebnaut-rx V0.8
input file C:\EbNaut\DK7FC\sum212223.wav
sample rate 0.457240 per second
rx frequency 8270
file start time 2018-02-22 22:21:17.790
polynomial 16K21A
crc size 22
number of chars 2
block size 34
symbol period 30.000
number of symbols 864
start offset 537.000
freq offset 0.100000
cores 2
list length 500000
skipped 538.011261 seconds to start
initial reference phase 30.6
---------------------------------------------
found DX
list rank 48426
reference phase 150,150,150,150
carrier S/N 11.04 dB in 38.6 uHz, -33.10 dB in 1Hz, -67.08 dB in 2.5kHz
carrier Es/N0 -18.33 dB
carrier Eb/N0 0.47 dB
info bit period 2273.68 seconds
symbol error rate 373/864 = 43.171 %
Es/N0 from symbol errors -18.2 dB
Eb/N0 from symbol errors 0.6 dB
Shannon capacity 2.5 bits/hour
Shannon efficiency 62.7 %
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv
elapsed 52 seconds
---------------------------------------------
found DX
list rank 17074
reference phase 120,150,120,150
carrier S/N 11.19 dB in 38.6 uHz, -32.94 dB in 1Hz, -66.92 dB in 2.5kHz
carrier Es/N0 -18.17 dB
carrier Eb/N0 0.62 dB
info bit period 2273.68 seconds
symbol error rate 374/864 = 43.287 %
Es/N0 from symbol errors -18.4 dB
Eb/N0 from symbol errors 0.4 dB
Shannon capacity 2.6 bits/hour
Shannon efficiency 60.5 %
symbols file C:\EbNaut\DK7FC\sum212223-symbols.csv
elapsed 383 seconds

Jay W1VD  WD2XNS  WE2XGR/2