Dear VLF, Today i spent some hours to do the next experiment with my earth electrode antenna that i have installed in a forest near Heidelberg. The 2 earth electrodes are about 600 m spaced, with 20
Dear group, Attached you see some pictures of the QRN Situation and my signal, received on my grabber in Heidelberg. To that time my grabber run in DFCW-240 mode,11,4 mHz FFT, so the S/N could have b
Mal, Are you talking about a earth electrode antenna or your vertical antenna? I assume you mean the vertical ;-) You will get several kV, most probably above 10 kV rms on your antenna. That's why a
Alex, Thank you for this chance you give us to see our signals in south America! Maybe QRSS30 is a little fast for EU but i will try it on the 4th of September :-) Best 73, Stefan/DK7FC Am 27.08.2010
Mal, I am using a galvanic decoupled primary winding at the bottom of the water barrel where the coil is wound on. Adjust the primary number of turns so that enough power is fed into the system. Watc
Hi Brian, I think you mean for RX? ;-) This is what i am currently using: http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.pdf The arrangement is visi
Hey Ossi/OE5ODL, Mni tnx for the test signal! You are the first station that appeared there, within the first active second on the web! :-) I stared at the screen as if this would be signals from Ven
Dear LF, Yesterday you gave me some ideas about which filter can be used befor the final stage of my active antenna for 137 kHz. Maybe there has much to be optimised but today i got a first result th
Hello Alex, All very interesting! LU1DOW confirm my error in ARGO last night : +0.2 Hz, I confirm this value receiving weak signal 153.000 Europe Broadcast 1 hour ago. 153 kHz is Donebach, DLF. You c
Alex, If you use SpecLab, you can display at least 10 Hz in 120 sec dot mode on a normal monitor (if choosen "1 pixel per FFT bin")! 73, Stefan Am 31.08.2010 03:30, schrieb Scott Tilley: Hi Alex I re
BTW, no one at all is transmitting on ELF (300 Hz... 3 kHz). This makes it a litter harder to evaluate the RX performance... Am 02.09.2010 11:02, schrieb Roger Lapthorn: Good luck Stefan. It will be
Wow, can i take a part of this interest? ;-) Stefan/DK7FC Am 29.09.2010 07:50, schrieb Mike McAlevey: Congratulations to Scott and Kuni. We look forward to seeing your signals in ZL. Mike ZL4OL
Hi Alberto, Indeed. Most (USB) soundcards for < 5 EUR can easily handle 48ks/s. Additionally it would be fine to receive even above 11050 Hz since e.g. the ALPHA transmitters starts to TX at 11904 Hz
Tnx Roger, Yes, my earth antenna is near field. Thus i am optimistic to see my signal there which might give first impressions about the performance of the antenna and so. Since i am > 30 dB above no
Dear LF/VLF, Am 01.09.2010 19:43, schrieb mal hamilton: Miracles are possible but impossibilities take a little longer. Yes. Thus is just want to announce some tests on ELF, probably arround 2 kHz. F
Hello Jay, Thanks for the info. I am glad too! :-) My antenna was the 100m kite vertical that was just in an angle of 45 deg, due to the poor wind. Thus, the radiation resistance was just about 410 m
Hello Scott, In which FFT resoltution / or QRSS mode do you record DCF39? Is it rather 1 second or 1 minute per pixel? 73, Stefan Am 09.09.2010 10:31, schrieb Scott Tilley: Thanks for the link Stefan
Hi Chris, Yes, right. But my _expression_ is the same. 0,707 = 1/sqrt(2), so U^2/R = P =(û/sqrt(2))^2/R =û^2/2/R =û^2/2*R. Measuring 100 Vp at 50 Ohm is 100 W :-) 73, Stefan Am 09.0
Hello Jay/W1VD, Sorry, i cannot send my answer to you. I get this message when the mail is returned: __________________________ -- The following addresses had permanent fatal errors -- <jrusgrove@co
