This is one way to start but maybe the 50Hz and it's harmonics could cause problems to the soundcard? Maybe it is useful to apply a simple LC-bandpass and/or a resonated antenna (wire, L and parallel
Dear LF group, I have a question to an audio reference signal generator and, as always, you will have some good suggestions... Since today i have also installed Spectrum Lab by DL4YHF. There, i found
Dear group, It seems that there are interesting theoretical questions to answer. And we, the practical interested's, could do this by trying that. Anyway if it is over 10km or 200km... Maybe we'll ge
Hey Wolf, Come back to LF! You can run the antenna on MF later, if you want ;-) Let's do it like 2004, 2mCW: 589, 2200mCW: 589 ;-) 73! Stefan/DK7FC (nw QTH Heidelberg) _______________________________
Congrats, Andy!! What is your next goal? DCF77 radiates 30kW EIRP if i am informed correctly... 73, Stefan/DK7FC ________________________________ Von: [email protected] im Auftrag vo
Interesting: 3MW TX power give 8W ERP, so 0,0003% efficiency at a commercial station on 76 Hz. But with that 8W ERP the whole world was covered. And we talk about 120* the frequency and for us, 300km
Yes, Rik. That's the problem. There will ever be very high voltages, even with a 300m vertical. So, one can start the calculation by defining the maximum allowed voltage at the antenna wire (to avoid
Jim, pse do not stop, i try to increase the wire length... Just 20 min... ________________________________ Von: [email protected] im Auftrag von Stefan Schäfer Gesendet: Mi 03.02.201
Hey Ken, Tnx for your statement. Well, i am not an expert in optic links and the parts i choose are probably not the best, that are available for this application. Theese parts were available for me
Jacek and group, That are really interesting responses here. That's what i like in this group! Well, perhaps it is not necessary to reach a "DX", DX becomes very relative in that frequency range. 50k
Hi Victor, Where can i get the design of your preamp? Is it a broad band design or also with some band pass filters? Is it with FETs and/or with OP amps? 28V? I assume +-14V, right? ;-) Is in this sh
Hi Roelof, My hint is http://www.elpro.org/shop.php?p=SFH+757+V for the SFH757V (6,58EUR), which has the same wavelength (660nm) and less maximum forward current. But the forward voltage is higher an
Oh, it's Jim/M0BMU! Tnx Jim. But still difficult here. My Loop is still not here so i cannot compare it with the E-field ant... ________________________________ Von: [email protected]
Pete, Yesterday in the night or today in the morning i had another idea. The mail wasn't reflected, perhaps too much data volume (sri, have forgotten to delete the old mails hanging on) 73, Stefan/DK
Dear group, In the picture in this mail i show the circuit of the simpelst way to transform the optic signal back to an alternating voltage that can be connected to the RX imput. It is the version wi
Andrey, tnx very much! Your signal is visible at the DF6NM grabber. Here it is also visible, but just "T". Hight above gnd seems not to be optimal and there is a wet tree near the ant. DCF39 is just
Tnx Gary and the group for that excellent discussion! Maybe, if you are involved in that VLF group, you can give them a hint what is happening here in the last days ;-)) I rather will spend my time f
Hello Alexander, Let us see what will happen if you cancel out that 100nF Cp: The overall C in the circuit is the C of the antenna, 1nF, so you need about 100* the L before. If we assume now, the res
Hi Wolf and tnx for informing others, After a talk with Markus/DF6NM and further thoughts abt the actual configuration it may be difficult to get a success tomorrow: The coil has a Q of just 38 (that
Rik, Interesting! And if we think about the field pattern of such a ferrite rod antenna it is even more interesting. Are you sure that there was no cross-talk? So, one could record a CW beacon messag
