I am out of range (Arizona this weekend) for your experiment, but interested. I have carefully measured infrastructure effects (including buried utilities and other utilities), and have coincidentall
Stefan, I will be listening in Arizona. I have a location that is free of cultural noise. Arizona is roughly 21dB from London at 9kHz. A bandwidth/FFT-window equal to the length of your test is ~ 30u
It might be informative to consider exploitation and mitigation of dispersion in approaches to compression for VLF links. Jim AA5BW I have received the following request from G4AEE of the Cave Radio
And DST has been quiet for a week, and it’s officially winter. I must agree with an expert in these matters: “…this uncertainty is what makes LF interesting and challenging.”
Most interesting Bob, Considering Dst indices and your reports for the last six weeks, is it safe to say that -50 or greater Dst means some bad days in this band, but benign Dsts are only a fair indi
Stefan, Nice clean layout. Are those polypropylene film capacitors on the printed circuit board? If so, great choice; best ESR at high voltage at 10kHz. 73, Jim AA5BW Hi VLF, Here i spent some time t
While working on VLF receiver noise this morning (~1100 UT) in Arizona a 35dB S/N signal ~ 50Hz wide (somewhat rectangular) appeared on the RJH6x marker for a few minutes, then disappeared. It didn&#
I have the same (or similar) question: I have SpecLab running VLF RX almost continuously in some low-noise locations, and would like to put the output online for open access; but I don’t know h
I anyone planning 8.9kHz tests in the near future? I'll have SpecLab running in the VLF from now on except for upgrades. What is the best frequency range to monitor? I have been planning to use 47uHz
Peter, Thank you, I had no idea how to run multiple instances of SpecLab, and had assumed that it could take some time to learn, and that there could be driver conflicts or memory conflicts. As soon
Peter, Is the Flux Density scale on your grabber calibrated? In femtotesla? Stefan's signal strength seems to be in the 0.1 to 0.4 range on your flux density scale. If Stefan's signal strength is nea
Stefan, I did not capture raw A/D data during your 8970.005 transmission yesterday, but I have figured out how to do so and will be ready next time. Based on SNR yesterday at Todmorden and virtually
Chris, Symbolic that the causality to which you allude manifests in the context of this particular band? 73, Jim AA5BW --Original Message-- From: [email protected] [mailto:owner-rsgb
Stefan, Thank you for the help, I’ve made your suggested adjustments to the FFT setting settings. Today I plan to add a second axis to the VLF RX antenna; hoping that steering the antenna (RDF
Wolf, Thank you for the information. I opened the link that you provided and read most of the document; this is a big help. I am in the early stages of familiarizing with the Spectrum Lab manual, and
Markus and Laurence, Thank you, your comments and screenshots are very helpful. Yes, the signal was at 20.5kHz. I talked myself out of taking a screenshot until I realized the signal was long gone, t
