Hm yes, maybe. But if you are outside in the nature (thinking about a total /p station consisting out of that antenna and a sensitive RX, a netbook running SL and a 70cm handheld TRX, and sitting on
Hi Stefan, The rods were found in Friedrichshafen for a bargain price. I later discovered (most likely after the topic had been discussed here, or in the VLF group) that these rods are used for induc
Hi Wolf, I thought about a resonated design which has a separate output winding at 50 Ohm, fed to some meters of RG174 (to be far enough from the netbook) and then to a preamp which i already have av
Dear Stefan, Alan, LF Group, I am afraid the tone of the article makes me a skeptic :-)) I have to agree with Alan - it has all the ingredients... The astonishing new discovery that so completely ove
Hm yes, maybe. But if you are outside in the nature (thinking about a total /p station consisting out of that antenna and a sensitive RX, a netbook running SL and a 70cm handheld TRX, and sitting on
Thank you Gerhard. Yes, i know about Ossis signal. I have forgotten to look for it during my tests but i have done a recording and could re-process it. But Ossi hasn't been QRV during that time, i ju
Interesting! Can anyone of the experts comment on this concept? After scrolling down through pages of text i just found a few photos. The mechanical concept is clear. But the author appears almost es
Dear Stefan, LF Group, I spent some time reading various texts and data books, and doing some calculations. The complete argument is too long and boring to type into an e-mail, but very approximately
Dear Stefan, LF Group, What do you think about the 50 Ohm output winding and a separate resonated winding? In this case, no... the 50R input preamp would have a higher noise figure, considerably lowe
Hi Marcelino The easiest small good antenna to build is a air cored loop aim for about 1m diameter or more if you can. In my opinion there will always work better than ferrites at LF. If you have pro
Hi Jim, Am 16.08.2011 17:54, schrieb James Moritz: I took an analog homemade VFO to generate a sine wave at 137 kHz, 20 mVp at 50 Ohm, measured with an oscilloscope. Then i added a 43 dB attenuator b
Jim, LF, I'll try to go on as fast as the distributor and ebay did ;-) So this is the current situation: Decided to use the 2x7 bundle. The cross section area of 7 pcs. just lokks better :-) Also the
Hello Wolf, Thanks to the link to your nice to read article. I just found it a hour before your mail and already read it ;-) Well, i also prefer the usual configuration instead of that sleeve antenn
Dear Stefan, LF Group, Today i did some new sensitivity measurements on my homemade RX (137 kHz -125 kHz => SpecLab). I took an analog homemade VFO to generate a sine wave at 137 kHz, 20 mVp at 50 Oh
Stefan Just about visible on ur grabber at present. A little tweak should do the trick de mal/g3kev -- Original Message -- From: [email protected] Stefan Schäfer To: rsgb_lf_group@blacks
Hello Markus, Jim, LF, Tnx for suggestions. Have to think about that later. I want to go on in small steps now. I added a 100 pF vari-cap which allows to resonate in the desired range (up to 137.8 kH
Hi again Marcelino, these can be succesful I got hold of a few in the UK a few years back they has longitudinal slots in them. maybe to reduce eddy currents in that application......the ferrite seems
Hello Wolf, Thanks to the link to your nice to read article. I just found it a hour before your mail and already read it ;-) Well, i also prefer the usual configuration instead of that sleeve antenna
