Paul Believe Dex W4DEX may have been transmitting at the time. Might check with him for verification. Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2 Dabbling with a spectrogram at 29501 Hz and back-dating it a co
Markus; Yes, 9 kHz is next or better yet "ELF"! I have to come up with more antenna height. 200' minimum so could run more than 200 watts without burning down the house! Uwe in Deutchland has develop
Congrats Dex, Bob, Paul and Warren for individual and team efforts and a great accomplishment! 73, Jim AA5BW An exchange of PMs confirms that Dex was transmitting at that time on 29501 Hz. Comparison
And folks whose work in recent years provided tools, methods, and inspiration. The transmission from Dex coincided with the second night of reception of Bob's signal. I put the two bands together in
Markus; It is even worse using the same short ant, say that I am using on 29 at 800 w. I would say a power reduction of several db would be required and added to your calculated signal reduction when
Paul, These are priceless, and informative; thanks. Jim AA5BW Determined listeners might try this one. This is last night's transmission, 9 hours starting 2014-03-04 23:00 and the time compression ra
An exchange of PMs confirms that Dex was transmitting at that time on 29501 Hz. Comparison of average signal level in 55uHz bandwidth from 02:00 to 07:00 UT http://abelian.org/vlf/tmp/140305a.png Bob
Paul, Dex, Bob, wow, I am very much impressed by this work! So it seems there's three to share the honour of the first amateur VLF atlantic crossing. Funny that history seems to repeat itself - remem
Hello Paul and all, Many thanks for the compilation and to anyone else involved - almost as impressive as the VLF natural radio signals ! As Johan 'LKM said, playing the file in a loop gives good rec
The transmission from Dex coincided with the second night of reception of Bob's signal. I put the two bands together in this image http://abelian.org/vlf/tmp/140305b.png Dex informs me he was transmi
Yes, an impressive achievement indeed, congratulations to all involved! Wow is the word! The 24dB S/N ratio on Dex' signal exceeded all my expectations! 24 dB S/N is "armchair copy". It would be inte
Also from me! :-) Go on with the interesting work. There will be more stations receiving you. 73, Stefan/DK7FC Am 05.03.2014 20:39, schrieb hvanesce: Congrats Dex, Bob, Paul and Warren for individual
Johan, unfortunately the difference between "upper and lower" VLF will be much larger than that. Operating a small electric antenna at the same voltage limit, radiated power scales with the fourth po
Well that 24dB is a 5 hour integration in 55uHz. It makes a big sharp line on the spectrum though. At VLF that counts as 'armchair'. No problem. 5 hours compressed into 22.5 seconds and frequency shi
Determined listeners might try this one. This is last night's transmission, 9 hours starting 2014-03-04 23:00 and the time compression ratio is the same (x800) http://67.207.143.181/wh2xba1_140303b.w
Hi Bob, Markus, Another thing is the coil losses. You will need about 10x more L to resonate the antenna when going down from 29.5 kHz to 8.27 kHz. Oh, that would be 300 kV if Bob wants to run the sa
May thanks for the files Paul! Yes. It will never become a popular "realtime chat mode" of course... Not exactly armchair copy but by looping the file a couple of times for "mental integration" I got
