Paul, In small VLF horizontal TX antenna simulations (NEC and FEKO) I have noticed that comparatively small inclinations (10 to 15 degrees) from horizontal can in some cases make a substantial differ
Hi Paul, VLF, Thanks! That's our todays and best result so far on 58 km :-) Do you think the phase on 5.17 kHz is more stable between day and night relative to 6.47 kHz? I would try a 24 hour transmi
VLF, Today i spent several hours just for moving the resonance frequency from 5.10 to 5.17 kHz. It shounds like an easy job but although i put more iron powder cores into the coil, which rises the sp
...unfortunately i made a mistake during a modification of the ALC regulator. Somehow the psk has stopped so the transmission failed :-( I will repeat the transmission starting tomorrow 8 UTC... 73,
Easy decode, +3.3dB with constant reference phase. Decoder continues to run, I expect a better decode with some phase pattern that compensates for the day/night shift. -- Paul Nicholson --
Hello Markus, In my announcement for the 8 character message i forgot to update the "duration" line. Of course it should be 23h 28min 0 sec. The transmission of the 4th was unintentionally interrupte
Hi Paul, That sounds very well. What was the message? :-) The error map of this decode would be interesting (maybe with and without the diurnal phase correction). 73, Stefan Am 06.01.2017 10:03, schr
Best decode with reference phase pattern: 30 30 0 0 Eb/N0 = +3.6 dB, BER 35.0%, list rank 0. S/N 20.24 dB in 11.8 uHz, -63.0dB in 2.5kHz The phase pattern is appropriate for an advance of the signal
Hi Paul, The errors in the 0 0 0 0 error map look quite equally spread. How much weaker is the average night signal relative to the day signal? If the difference is not much, it would be worth to use
PS: Was the message decodable in Italy as well? Would be interesting to see if Renato got it too. I don't want to cause to much work to you, so only check it if you like. I don't even know how much e
Decoded '73 DK7FC' from Cumiana (Renato Romero, vlf15, 504.6km) with constant ref phase, Eb/N0 = 0.6, S/N 16.16 dB in 11.8 uHz, -67dB in 2.5kHz. Very strong at Bielefeld (Wolf Buescher, vlf6, 303.8km
Thanks Paul (and Renato and Wolf!), very well! The carrier on 5170.001250 Hz is still on the air and will run until 18 UTC. Since it appears that you and Jacek are the only ones trying to receive my
20 chars uses 42Gbyte RAM. 25 chars is about the limit on my workstation unless I turn off a few things. But more is no problem, I simply spot request a suitable machine on AWS. The largest availabl
Stefan, thanks for sending that long carrier! Unfortunately no trace appeared in any of my spectrograms, just plain nothing. So I guess my RX is out of the game below 8 kHz. 73, Markus (DF6NM) --Ursp
Hi Markus, Sorry to hear. And probably you are not the only one! Wouldn't it be a nice project to spend the fridays in a garden in a silent location where you can relax together with Gizmo and build
Hello Jim, Thanks for your informative and inspiring contributions and the link to the paper. We will get more data in the future, also from lower bands. So far 2.97 kHz works very well out to 65 km
Unfortunately the transmission has stopped at 11:26 UTC, which is 6h 4min 40s to early. I don't know why :-(. No reason can be found in SpecLab (no scheduled actions active). The parameter a=0.5 whic
