Many thanks Markus and Domenico. I'm really pleased with that. I make that about 2022 km. A distance record for me! Maybe that is the farthest EbNaut on MF so far? My callsign decodes with Eb/N0 = -0
Good luck Joe. I've held the MF record for 24 hours, that's long enough - over to you now. Thanks I downloaded all the .wav and have been playing with the decoder and looking at the in-between carri
I wrote the other day about seeing a transient that I thought was bouncing off the primary center. Now after dismantling and measuring a few things I find that transient was reflecting from the LPF w
I just discovered something as I turned off the 12V supply to the CD4040 I've been using to divide 477.69kHz by 16. With the supply off - it still works - with a nice square 29855.625 Hz output! It s
Congratulations Joe and Markus! A new record, I make that 4555 km and with a dB or two to spare. That's really is a milestone for coherent at MF. I wonder if the propagation would stand longer symbol
No worries, I have a lot of satisfaction from seeing the software doing its job and being used to push the limits. It will be interesting to see if 2 second symbols decode near 3dB better than 1 sec
Well done, I reckon that to be 5418 km. I expect that record will stand for some time. The signal was -45dB in a 2.5kHz audio bandwidth and had a dB or two to spare. I don't think it would have decod
Today saw another 200m of wire added to the long wire antenna. Its impedance dips to a minimum of 70 ohms at about 170kHz corresponding to a free-space quarter wavelength of 440m which is somewhat le
I received one of these from China, http://www.ebay.co.uk/itm/GPS-DISCiPLINED-CLOCK-GPSDO-10MHz-10M-OUTPUT-SQUARE-WAVE-RS232-OUTPUT-GPS-NMEA-s-/252011014153 and it works nicely. The GPS is a U-Blox N
An easy decode Eb/N0 = 1.7 dB, BER 34.2% and the phase pattern was -30 -30 0 0. Carrier -55.8dB in 2.5kHz after sferic blanking. Decoded with Eb/N0 = 0.0 dB, BER 36.9%, phase -30 -30 0 0, carrier -56
I rebuilt the PA with bifilar wound choke feeding DC to the push-pull drains and the primary winding on the toroid has no center tap. With no load and with 50 ohms directly on the secondary the drain
Thanks Tobias and Stefan! I ordered a few T130-2 and a couple of T200-2, should arrive in time for next weekend. Meanwhile, I rebuilt the filter using air cored coils and it works great. A lovely 200
Could be? Carrier on air 136.175 kHz intermittent since 16:40, continuous since 16:54 and later will move to a frequency in the OPDS band for some EbNaut. 236W DC input. Instant LF coupling transfor
That reminds me, I need to stock up a bit with FKP caps! I haven't measured the antenna current, I'll have to rig something up to measure that. It's probably 2 or 3 amps. The wire is about 500m but
Looking at Gary's page http://myweb.tiscali.co.uk/wgtaylor/grabber2.html My signal shows up well on grab 2 but grab 3 there are some glitches which I can't account for. And scrolling down to grab 5 t
The transmitter is running happily so I will leave it on for a few more hours. Frequency: 137455.00000 Hz Coding: 8K19A Chars: 12 Symbols: 848 at 2 seconds Duration: 1696 seconds, 00:28:16.00 Repeat:
There was a small wobble of the DHO phase at about that time - about 3 degrees peak at 10:24 - and it didn't last long. Except for that there were no other disturbances. A pity really, that might hav
Repeats 20:00 to 08:00 completed and closed down at 08:30 Frequency: 137455.00000 Hz Coding: 8K19A Chars: 12 Symbols: 848 at 2 seconds Duration: 1696 seconds, 00:28:16.00 -- Paul Nicholson --
Thanks all very much indeed for the reports and decodes. I've downloaded Domenico's wav files for a closer look. It was a good result for EbNaut. The best decode by Domenico corresponds to about -46d
