Hello Stefan, Concurring with Alan and rambling from there: Of the many (at best rough) methods of predicting or correcting VLF phase (and/or estimating path parameters) at any given time of day, one
Stefan, Congratulations on your ~20dB SNR at 65 km, 2970 Hz, that is quite a landmark supported by hard work. You mentioned that the phase changes at 65 km do not seem to be from the transmitter, and
Hello Stefan, Your data becomes more fascinating with each update. From the .jpg image that you attached, it seems like the phase changes at the 3.5 km site are not from SNR and probably not from sim
I have a neodymium magnet ELF-ULF transmitter in storage. I built it out of curiosity. Even the container is a curious thing, made to withstand the inevitable; pre-construction analysis showed that t
Warren, Thanks for those comments. I have often wondered about the mechanical limits. I had to carefully enclose the neodymium in a high-shear-strength case to overcome the shear-strength limit of th
Wow! Fine work, quite an accomplishment in many respects. I cheered in private. Thank you Stefan and Paul. Jim AA5BW --Original Message-- From: [email protected] [mailto:owner-rsgb_l
Paul, Highly instructive, clear, reader-friendly, makes essential principles understandable. Also a pleasure to read. Best by far in capturing the essence, I learned a lot. Thank you. Jim AA5BW --Ori
That's a keeper Bill. - Jim AA5BW There should be a "Nicholson limit" for how well something of a certain complexity can be explained using a given number of words with a high probability of being un
Stefan, If you ever become interested in encapsulating an HV coil, I can send details for a straightforward process for low-cost/lightweight encapsulation that gives 10-year life in harsh outdoor env
Hello Stefan, The process is public information but in a niche area so there is probably no online link. Friends and I spent a year or so developing it, so we remember all of the fine details; I will
Paul and Stefan, Nice work, including parameters and modeling. Was the LWPC TX antenna angle parameter fairly close to actual angle? 73, Jim AA5BW Looks good. Last night the carrier 2017-01-01_17:00,
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
Very cool. Mine safety folks might like that. Jim AA5BW A decode from a near field test at VLF: Rank 6938 Eb/N0 -0.4 dB 8K19A 60 chars The interesting thing is, the symbol period is 6.25 milliseconds
Hello Stefan, Congratulations on your first capture of signals from the new 970 Hz setup. Some observations regarding operation at 970Hz, 2.97kHz, 5.17kHz and 6.47kHz are attached. Summary: the resul
Hello Paul and Stefan, If 0.7fT at Paul's location means roughly 50uW (conservatively?), does it seem reasonable that if I could confirm (for example) a 39.6N, 77.5W location that enables 1fT/rt-Hz n
