Hi Roger, Am 23.11.2010 12:51, schrieb Roger Lapthorn: They also require copies of a log showing the actual activity so they can check if they were being interfered with (I book for a day but may onl
Chris, Alan, LF, Am 24.11.2010 11:26, schrieb Alan Melia: Chris I dont think slowing the drive edges will be the answer. This is a switching PA and needs to switch quickly otherwise the dissipation w
Mike, LF, I just updated my grabber too. A EU window for QRSS60 and QRSS120 is now available. 73, Stefan/DK7FC Am 16.11.2010 11:55, schrieb Mike Dennison: Thanks for that service, Laurence. I shall b
Hi John, It looks professional! What is the maximum spark length you can achieve? You are using a motor and a rotating contact to switch the primary to a capacitor bank? Would be interesting if i wou
Hi Daniele, OK now. So you have done it right. The generated noise is well above the noise of the soundcard+the noise of the antenna. And the noise of the soundcard+the noise of the antenna is well a
Nice signal, Mike, 73, Stefan Am 03.11.2010 17:57, schrieb Mike Dennison: I will be active tonight from 1700 to 0900 UTC, transmitting 'X' on QRSS120, once each hour starting on the hour. ID will be
Hi Gary, Am 18.11.2010 12:13, schrieb Gary - G4WGT: Got to agree that the uk limit is not good news for 9kHz but I won't be trying to fly a kite anyway But my signal was detected in UK by Paul Nichol
Hi Daniele, Hmm, consider Alans ideas too. Maybe he is right about the generator. I am wondering too, why the maximum gain is at 2 kHz. Ehm, how does the Spectrum look if you connect the generator to
Hi Lubos, Interesting! And very nice that you are monitoring now! Maybe it was Gerhard/OE3GHB? He is in about 40km to you if i remember correctly. It wasn't me ;-) Exciting! :-) 73, Stefan Am 29.11.2
...should mean thank you very much. The others too, of course :-) I have a positive feedback of Paul Nicholson, DD7PC, DK7FC, DF9PW, EI8JK, DL3ZID, G4GWT, OE5ODL so far. This is definitely worth the
Hi Chris, You are using a class D PA? Maybe you don't even need a output transformer if you apply a coupling winding on the coil. Why are the FETs blew up? Overvoltage or overtemperature? And what ty
Hi Roger, Wish you good luck and fun with the experiments! Who is the next possibe RX station and what is the distance? What is his RX situation? Maybe you can monitor your own generated TX signal on
Dear VLF, It seems these batteries are not in best condition. The carrier got weaker and weaker in the morning and disappeared arround 5 UTC. The SMPS that drives the PA is designed to generate its o
Tony, Excellent, that you very much!! 73, Stefan Am 09.11.2010 10:22, schrieb Tony: Hi Stefan. I will leave my system running for the 24 hours tomorrow. Even if there is next to no chance of receivin
Hi Laurence, Thank you for the grabber. It is interesting to have the possibility to check the diurnal changes of the lower Alpha trace which gives some hints about the best transmission times to you
VLF, Now i have completed the overall reception list of all the experiments. See: http://www.iup.uni-heidelberg.de/schaefer_vlf/pic/VLF%20DX%209th.png Furthermore i have created 2 google earth earth
Hi Mike, Am 01.12.2010 15:13, schrieb Mike Dennison: JA7NI, Kuni, is looking for someone that can provide him with a modified ARGO capable of displaying a wider freq coverage at QRSS120. The solution
Hi Chris, Well, in the last experiments my ERP was increased each time. But now i am reaching some limits. 300m is one limit. Now i can just reduce the losses and/or increase the TX power. Thus i hav
Hi Chris, But how do you explain that i have crossed 49.6 km with a 600m spaced earth electrode antenna on 8970 Hz? It was rather summer time than winther (regarding QRN)! With the same antenna, my 1
Johan, Am 16.12.2010 13:26, schrieb Johan H. Bodin: I measured the input impedance of the mic input on a Dell laptop: AC input impedance: 4.3 kOhms (-6dB with 4k3 resistor in series) Mic bias voltage
