To: | rsgb_lf_group@blacksheep.org |
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Subject: | Re: LF: Re: VLF 29501, signal? |
From: | Johan Bodin <jhbodin@tele2.se> |
Date: | Thu, 06 Mar 2014 13:15:50 +0100 |
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May thanks for the files Paul! Paul Nicholson wrote: > 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'. Yes. It will never become a popular "realtime chat mode" of course... > No problem. 5 hours compressed into 22.5 seconds > and frequency shifted so that 29499 Hz is moved > to 400 Hz. wav format 32k samples/sec mono 1.4 Mbyte > > http://67.207.143.181/wh2xba1_140303a.wav > > How good is your 'CW ear' I wonder? Not exactly armchair copy but by looping the file a couple of times for "mental integration" I got XBA XBA XBA without any doubt. Yes, the second file wh2xba1_140303b.wav was slightly easier to read due to the higher CW speed. Thank you for the music Bob! An MFSK system with integrate-and-dump detectors synchronized to the TX should be capable of conveying quite a number of bits per hour. The low speed would allow many tones in a small BW. Some tones could even be reserved for commonly used words or sentences like "It is not raining in Tokyo also" :-) 73 Johan |
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