Congradulations, Markus! 12km is well out of near reactive zone. Thus further dictance increasing is not too dificult:-) This corresponds well with previous mesurements. Regards, Alexander/RA9MB
By the way it is very close to estimation: E(800km) ~ E(100km)*sqrt(100km/800km) where E(100km) calculated without ionospere, as you, Markus, calculated. Certanly it is very rought formala. Up to the
Paul, parameter 'a' may be essentually larger if signal propagated over salt water. It depends on deposit of ionosphere and ground to attenuation. Thus nice theoretical problem arises. We can rather
Dear Jim, to get constant Q one should scale coil dimension as sqare root of wavelength (if neglect dielectric losses). May be it sounds strange but it is so, sure. Conventional scaling wellknown in
Hi Stefan, Wolf BTW using FpGA from Xilinx or Altera anybody can easy build CPU with any instruction set you like. Whith all perepheral devices (and RAM) in the same crystall. It's my favorit 'toy' n
Hi John. Did anyone see anything of the Russian expedition? I have seen nothing despite continuous monitoring and seeing all the stations reported by others.<br /> See oh2aq dx summit. There is some
Hellow Group. Has anybody any info on UA6 activity? Or may be sombody has hear them? I have increase my RX sensativity and build loop antenna but nothin hear yet (13-00Z). I hope to hear them in norm
Hello Rik and Group. 1. Does someone has a formula that has proven to be usable for big loops. About 7 years ago I have derived formula for circular loop. It is very simple L=D*N^2. Where D is diamet
Hi Fabian and Group. I can't imagine how computer or TV set can generate such a regular continuos (many hours) signal. Hi Alex, I hear similar QRM with a certain 'beat' on LF sometimes which most lik
Hellow, Group. All this evening (now 15-55 Z, 21-55 local) I hear someone "beep-beep-beep.." near 137.6 kHz. I can't define frequensy exectly yet. There is about 90 "beeps" per minute. What can it be
Hi, Larry and Group. Yes, it's. Alex, I will be hopefully returning to 136 with as much as a Decca amp can make from 70V DC at 25 Amps starting after August this coming year. It seems to be more then
Hellow LF Group. If you prefer not to use a PC to transmit QRSS you can indeed program a PIC, it will be OK for beacon transmissions but might be a bit complicated for a 2-way QSO to change the text.
Hello, Rik ang LF Group. You are in the range of 4000 to 4700 km of most European LF stations. That might be a bit too much for normal CW. But trans-atlantic tests in the past years have shown that w
Hi, Jim and Group. Will be interested to hear about any of your investigations on this subject. OK. If I'll get any sucsess in such an investigation I'll send info. Just yesterday I have understand t
Hi, Stewart ang Group. A very brief look at Balanis "Antenna Theory" has the passing comment that proximity effect can lead to greater loss than skin effect (on a discussion on small loops). He refer
Hi John and group! Thanks a lot for your coments. It is a very interesting subject for me because I am not a HAM only but a physicist also. I have do some theoretical investigation of power absorptio
