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
Wow, DHO38 is on air now and seems to transmit a CW carrier. This carrier is 60 dB (!) above noise in 1,46 Hz (without NB) on my grabber. The strongest far field signal i ever saw on VLF :-) Have the
Hi Tony, That sounds good. What will be the hight above ground of that wire? And are there many trees and buildings in the near of that or just shore? :-) 73, Stefan Am 23.06.2010 11:21, schrieb Tony
Hey Wolf, Very nice!!! Congrats to your practical experiment!! Are you still transmitting? Sorry, i did some adjustments on grabber2 (yesterday i changed something that increased the signal but decre
Hello Roelof, Am 13.07.2010 19:54, schrieb Roelof Bakker: I have an external soundcard which has a 192 kHz sample rate. This makes it possible to receive 0-96 kHz on your soundcard with excellent res
Sri for the amount of mails but i have forgotten to attach the screenshot of DHO38 by reception with the 1m^2 single turn loop... Now finished for today ;-) 73, Stefan Attachment: DHO38 in 1m^2 loop,
Excellent work Markus, mni TNX! Am 12.07.2010 18:04, schrieb Markus Vester: Regarding noise, the QRN pattern might be delayed or differently shaped on the east coast of a continent, because lightning
Hi Uwe, This is very fine that you will be QRV there as well! I am hopefully that you will generate a nice signal that will be detectable here in Heidelberg (maybe not in the moment, due to heavy thu
Hello Jim and the group, Today i did the test with the 1m*1m loop again. It was necessary to go down to abt 750 mHz and indeed, the DHO38 signal appeared at about -100 dB when turning the loop for op
Hello Rik, Assume, i will increase the wire length or electrode spacing to 1200m this will not only be a full size dipole for 137 kHz but on 9 kHz the area might become 480000 m^2. Then, 1,75 A is ne
Wow! Congrats to all RXers! This is a fine ducumentation by Alberto and Marcin! Sadly my grabber PC shut down due to overheating before 2 days, as it seems :-( Yesterday we had 36 °C and the sun is s
Roger, LF, Just forgotten to mention: Today i tried just for fun if it is possible to make the Deutschlandfunk DLF / 153 kHz audible in a car speaker (4 Ohm) without any additional energy sources and
Yes indeed. And here i found a very interesting and fascinating video in german language about SAQ. This makes fascinating for the nostalgic flair on the whole VLF, not just on 17,2 kHz. Amazing stuf
That's it, Rik! What about the model if we replace the switch by the loss resistance (today measured as 800 Ohm) plus a capacitance that is equivalent to the C between the electrodes? This could be d
Dear VLF interested OMs, This mail is written with dirty hands out of my car, now in 520m ASL. Raindrops are falling on the car roof and i am listening the CW-beacon "HDL" at 426 kHz (AM mode) in my
