Mal, No, it is OFF again. It was on just about 15 minutes. Later i checked this trace and ALPHA F1 @ 11904.762 Hz was 40dB above noise in 424 µHz. 73, Stefan Am 31.05.2010 19:48, schrieb mal ha
Dear LF, For the discussion: This is a picture of the TV transformer antenna arrangement i used: I just started another try but there was a strong thunderstorm going over Heidelberg with many lightni
Hello Daniele, This done by a special TX LED (SFH750V)that is switched into the line (Drain to +) of the second FET of the active antenna. 73, Stefan Am 13.05.2010 22:42, schrieb Daniele Tincani: Hel
VLF, Just for the small group of VLF grabber interested OMs: To check the new location for my grabber i have set up a second grabber page that displays the signals of the test setup antenna with fibe
Dear group, Now i have updated my website. There are some pictures and a description of the last experiment. The new > 500W PA is displayed and a screenshot of my grabber in DFCW-600 mode. For those
Hello Victor, LF, It took a little bit to reply to your answer. You have been absolutely right! DLF(153kHz) is here just some 10km away and the strong french LF broadcast station on 162kHz has caused
Dear VLF/LF, Am 19.05.2010 21:11, schrieb Jacek Lipkowski: a much better test of antennas would be if people can receive SAQ with the key up (when it is not transmitting) - i don't know what the outp
Hi Andrey, Nice to cuagn! Interesting! On which frequency is the transmitter now? 73, Stefan Am 30.06.2010 12:37, schrieb rn3agc: Hi (V)LF, Today periodically the signal has been modulated, including
LF, VLF, Once i have created an Excel sheet for calculating my vertical kite antenna on 137 kHz. Today i want to share it with you. It is in german language but usable for everyone anyway i think. It
Yes, i can imagine that. Especially such attachments are most often classified as "unsafe". But in this case, you know, they aren't ;-) 73, Stefan Am 01.06.2010 12:19, schrieb mal hamilton: Stefan So
Dear VLF, As mentioned in the subject i have done a test on 8,97 kHz today in the morning, where the natural QRN has it's lowest level during the day. I used a 120m long wire antenna that was placed
Mal, Are you sure? Send us a screenshot of that signal. I do not see anything here! (12:40 UTC) Stefan Am 02.06.2010 14:45, schrieb mal hamilton: VLF Just ckd and Alpha is back so now I know my RX sy
Rik, Roger, VLF, What i want to try is to "couple" two rivulets that are running down on different sides of a mountain. Each one could act as a conductor regarding the different conductances of water
Wolf, You are running 2,9 kVA or really 2,9 kW? Impressing! Which PA are you using? This is the advantage of having a mains connection! ;-) For a loop this is no problem but if i apply that power on
Wow, nice, congrats! What was the mode in which you have transmitted? QRSS120? You could try such a TV transformer. That may give you easily 30dB more power (depending on your losses), so you could r
Dear LF/VLF, Today i spent more than 8 hours in the forest on a hill 520m ASL, improving and experimenting with my VLF earth antenna. It was a fantastic and very successful day that gave a lot of fun
Markus, Are you sure it is a sample rate alias? May be possible but where do you know that they don't come back to real 18 kHz? The 8,97 kHz band filter becomes more and more efficient on higher fre
Hello Roger, Am 04.06.2010 21:48, schrieb Roger Lapthorn: Stefan, A few observations on your tests using the earth electrode "antenna" today: In my experience, most of the signal transmission is by i
Wolf, And what are you using as the VFO? Is it GPS-locked? What is the TX power? What type of PA are you using? What about the antenna current and the wire diameter and will you run this system reall
Hello Wolf, Today is not the best day for transmission tests on VLF, hi. See the picture on the 600 grabber. There were > 8000 lightnings within the last 2 hours in our region. I was driven on the hi
