Hi Stefan Conditions are not as good during daylight as when you decided to give DFCW a try in 424 uHz. It will be interesting to see what happens during today. There was a glitch also at the start f
Hi Eddie, Paul, Jacek, VLF, Thanks for watching. I already saw the poor propagation during the first element and later the spectrogram slip. So it looks like Paul and Jacek could be the only watching
Eddie, What i wanted to suggest: What about a loop as an alternative antenna? With 2 soundcards you could run 2 spectrograms comparing both antennas. You know the loop in my tree is a single turn loo
Hi Stefan Loops at this QTH are not very successful, yes lots of mains borne QRM. I do have a 1.2m diameter octagonal 10mm copper loop, I have never tried that on Sub 9kHz, I may try it one day down
In the time it took to send 'DK7' you could have sent 330 characters using a more efficient mode. Or sent DK7 with a signal 20dB weaker. From a nearby thread: That's in the next revision, and some o
Hi Paul, VLF, The transmission is complete now. 5 characters in not even 2 days!! I like DFCW anyway. :-) In attachment there is the spectrogram from the signal as received on the tree. I would be in
Hi Markus, The spectrograms are nice, thanks. Good to train the local human analog decoder a bit, by interpreting elements buried in the noise :-) 73, Stefan Am 11.04.2017 14:07, schrieb Markus Veste
Blue sky idea: Might it be possible to subtract (rather than filter) the hum from the signal, being as it is such a constant source ? Either with analogue electronics, or via digital signal processin
Hi John Good thinking. I think the hum filters used in SpectrumLab specificity the Paul Nicholson ones work in that manner. A lot of the mains borne interference is from consumer gadgets with switch
...you may ask the neighbours to place a wire antenna close to their house, picking up strong E fields :-) These signals fed to a JFET source follower, then use a transformer somewhere in your RX cha
Hi Paul, Thanks for the spectrogram you produced. Am 10.04.2017 22:49, schrieb Paul Nicholson: From a nearby thread: That's in the next revision, and some other alterations which I hope I can finish
On 13/04/2017 14:59, DK7FC wrote: ...you may ask the neighbours to place a wire antenna close to their house, picking up strong E fields :-) These signals fed to a JFET source follower, then use a tr
