Hello John, LF, I wish you good luck! In 3 weeks i will be QRV on 137 kHz in CW and DFCW from near Verdun, in JN29PD using QRO and a proper antenna ;-) Maybe you are interested in a QSO? 73, Stefan/D
Dear Jim, Alan, Gerhard, LF, Agn tnx for your suggestions! OK, so my way to realise the filter was not too worse. Tomorrow i will play with a double LC filter, just as applied before the BF981, just
Mal, I have a 2 uF C in series to the primary coil. I am using a homemade H bridge switching mode PA. The circuit is currently just in my mind but maybe i can draw and publish it soon. The impedance
Mal, Tnx for the report. Yes, there are still some dB missing. I have thought that you had even less power tonite but if it was the same like before some days... Tnx for the test signal that was T co
Dear LF group, This weekend i will be active with my kite vertical antenna on 137 kHz out of France, near Verdun, JN29PD. Background: The local ham radio club (http://www.f42.info/) where i am member
Markus, LF, Nice reception of your transmission! It was several 10 dB above noise ;-) Thanks for the test! The grabber has some working point temperature drifting problems but with the AGC it reasona
BTW, i have added a peak holding graph (green line) that shows the peak of the last 120 seconds (in QRSS-3), makes it easier to check the maximum S/N during transmitting... Am 25.08.2010 19:51, schri
LF, The 137 activity starts. DK1IS is 25 dB above noise in DFCW-3 on my grabber (which runs again since yesterday, still not optimised yet). 73, Stefan Attachment: DK1IS_QRSS3.jpg Description: JPEG i
Hi Rick, Am 17.08.2010 11:10, schrieb Rick Wakatori: This is an example of sending by the two earth electrodes antenna. I hope more experimeters will got a same trend. 7L1RLL Rick This weekend, i pla
Hello Dave, Thank you. Yes, lightnings or just charges clouds are really an issue, especially when beeing on a hill there! One can see those charged droplets when they fall on the antenna of my VLF g
Hi Scott, Congrats to that excellent reception and your new antenna! Very impressing! Will you try to use it on VLF as well? :-) I am interested what you have to tell about it on your web page, so ps
VLF, Capture "N" by DF6NM in DFCW-3000 Am 29.08.2010 16:26, schrieb Stefan Schäfer: VLF, He seems to send "N" in DFCW-3000. The dash is clearly visible in my 6000' window, the dot comes in now, altho
It is OE5ODL, transmitting for test purposes @ 2W TX power in QRSS-10. QRB to me is 376 km. So, not he has a vy gd ant! Since today i am offering a QRSS-10 window on the LF grabber. Further windows w
Hello Warren, Not tonight, sorry. But surely in the next few days. Promised! ;-) 73, Stefan Am 06.08.2010 19:24, schrieb Warren Ziegler: Stefan, Can you monitor my signal 137.7798 QRSS 60 tonight 01:
VLF, On http://abelian.org/vlf/ss100801/ you can find Paul Nicholsons most interesting final report on his reception and filter processing of this 6470 Hz experiment. 73, Stefan/DK7FC
ecty=acty ;-) Am 07.08.2010 13:42, schrieb Stefan Schäfer: Mal, My next ecty will bemost probably in september. It will be on 8,97 and 6,47... But the grabbers are running all the time! 73, Stef
VLF, Today, the QRN is extremely low again. I can see several traces of VLF transmitters such as VTX India @ 17 kHz and a trace @ 21,3 kHz in 1,4 Hz. What transmitter is at 21,3 kHz? I haven't found
Hi Roger, How stable is your frequency? How is it generated? For QRSS-3 it can be generated by a home made LC oscillator. If you have a stable TX (frequency and drift), we could do some tests in some
