Uwe and Markus, Was he out from about 02:15 to 03:15? I’m trying to interpret using Markus’ grabber. Hope springs eternal here that with management of natural noise, continuous monitoring
Thank you Markus, They are a stealthy lot so the extra eyes on are much appreciated (hope only Uwe reads this at his end). I don’t see any signs of perambulation 17 – 21 UT so I will add
Stefan; Even if you have your coils in weather proof housing rain is no good to transmit on 9 kHz? Bob Date: Thu, 26 Dec 2013 13:55:11 +0100 From: [email protected] To: rsgb_lf_gr
Stefan; If I go to VLF I am going to add to my existing inductance outside. I plan to make a box using "plexiglass" quarter inch thick with glued seams so is weather proof. It will be clear [no color
Stefan; I understand your setup. It is not that hard to move. I am not going to use such low VLF freq but as I mentioned am going for license to try get 28-30 kHz. Then I can run power up with less t
Bob and Stefan, Any thought of using Fluorinert to prevent coil breakdown? In indoor applications, if we didn’t want a high-voltage (including 100kV and higher) coil (or transformer or connecto
Jim; I see it's a liquid that is really a coolant. I use clear lacquer and corona dope in a spray can and spray coils with it. I use Stefan's round brass balls that I have soldered to any point that
Bob, Thanks for the feedback, sounds like you have corona well-managed on the coil. For future reference, in case someone in the group has an outdoor HV application in a particularly humid environmen
Stefan, If arc-induced breakdown paths between turns is an issue, have you considered adding a homebrew corona inception detector with feedback to the modulator or switch driver? I haven’t made
Stefan, Thank you for the information. I was hoping for input from you and Uwe on ERP and antenna angle, and your information is very helpful. Regarding antenna angle: I am hoping to detect T/A VLF s
Yes, Markus, but he is back agn. GL, Uwe Von: [email protected] Gesendet: 23.12.2013 20:52 An: [email protected] Betreff: VLF: 8969.99 Hey Uwe, your cat's on walkabout again! 73
Hi Jim, didn't see the cat myself, he was betrayed to me by others Lubos http://www.ok2bvg.cz/vlfgrabber/ Paul http://abelian.org/vlf/fbins.shtml#p=1387832400&b=080&s=sp Peter http://www.qsl.net/pa1s
Jim, More informations for you: http://abelian.org/vlf/ss111126/ ... if you haven't found the link yet. Paul Nicholson is certainly the man who can answer these VLF phase variation questions better t
Cat alarm! Today noise and QRM is very low here, and now there's a clear trace on my grabber http://df6nm.darc.de/vlf/vlfgrabber.htm ... about 13 dB SNR in 0.47 mHz, and even faintly visible in "600"
Hi Marcus Yes just visible. The storms have left us here, temporarily they say. 73 Eddie On 25/12/2013 13:57, Markus Vester wrote: Cat alarm! Today noise and QRM is very low here, and now there's a c
Hi All Yes, yesterday was quieter on 8.9KHz with less catastrophic noise pulses. This meant that although Uwe's signal was less strong than during other tests I was in the catchment area. The low sig
Hi Uwe, Tom, VLF, Best signal ever from Tom, capture attached. Is it due to the propagation or did it improve your signal? What about some tests in OPDS32 or maybe JT9-30? Unfortunately there is perm
Hi Bob, Of course, if the coil is protected against rain, then it is no problem. But the coil is quite large and due to the high voltage, the housing should ideally have a distance of 30cm or more to
Hi Bob, Oh, you're planning to become QRV on VLF, great! What inductance will you need for your system? What coil diameter and wire diameter will you use? It is important to calculate the dimension o
Hello Jim, Am 27.12.2013 00:10, schrieb hvanesce: Would 500W into a 300m antenna imply approximately 10mW < ERP < 50mW after coil losses, at 9kHz? I assume that question is directed to me? In these e
