W4DEX achieved another 'first' recently by sending a series of messages across the Atlantic at 8822 Hz which were successfully copied at Todmorden UK, range 6194km. Transmissions used coherent BPSK s
Big congratulations again to Paul and Dex! What Paul described in unpretentious and matter-of-fact words should really be regarded as a major achievement. It has been a well-deserved fruit of several
Phantastic, many thanks for the summary Markus. "Brute force" in a very elegant context ! Cheers, Wolf . Am 04.01.2015 16:11, schrieb Markus Vester: Big congratulations again to Paul and Dex! What Pa
Big congratulations again to Paul and Dex! What Paul described in unpretentious and matter-of-fact words should really be regarded as a major achievement. It has been a well-deserved fruit of seve
Big congratulations again to Paul and Dex! What Paul described in unpretentious and matter-of-fact words should really be regarded as a major achievement. It has been a well-deserved fruit of seve
Warren, A good general book on coding theory, that also covers convolutional codes, is Error Control Coding by Lin and Costello or Principles of Digital Communications and Coding by Viterbi and Omura
Warren, A good general book on coding theory, that also covers convolutional codes, is Error Control Coding by Lin and Costello or Principles of Digital Communications and Coding by Viterbi and Om
W4DEX achieved another 'first' recently by sending a series of messages across the Atlantic at 8822 Hz which were successfully copied at Todmorden UK, range 6194km I achieved another first? You can't
By reversing the modulation of Dex's Jan 1st transmission, the carrier is reconstructed. S/N and phase in in 1 hour (278uHz) steps: 00:00 to 01:00 11.6 dB -122.1 01:00 to 02:00 13.1 dB -119.4 02:00 t
Paul, Congratulations to you, Dex and the rest of the team on this work, including 73% channel capacity in the midst of many constraints! I had planned to ask if you thought that any atmospheric phas
Yes. To demonstrate... I mixed a locally (software) generated carrier into the audio recording of 1st Jan 00:00 to 07:00, placing it at 8823 Hz and setting the level to match approximately the averag
I made a spectrogram from the reconstructed carrier (the BPSK modulation removed by undoing the phase reversals). http://abelian.org/vlf/tmp/150106a.png The bin bandwidth is set to the bandwidth of t
Paul, Thank you! I'm always looking forward to higher SNRs that could enable applications of the types that you mentioned below. The rarity (that you so aptly described) of useable (calibrated or val
Another spectrogram from 1st Jan. The BPSK signal from W4DEX was just strong enough to be visible at Forest VA (254 km) as a noisy band about 0.1Hz wide, http://abelian.org/vlf/tmp/150106b.png Bin wi
