Длинноволновики всех стран объединяйтесь!LW-mans of all countries unite!
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Hi Alex, > yes indeed, this is the first reception of a VLF signal from > Russia in the UK so far!Thanks, I updated the listhttp://abelian.org/vlf/amateur-radio/ > could you give us a short description of your receiving system, > it would be especially interesting to see the circuits of > low-noise amplifiers for electric and magnetic antennas.Sure. Below, some links to the hardware for you to use.E-field antenna: 2m x 4cm tube (water pipe) stuffed with wireand acoustic ballast/damping. Base is about 2m above ground,effective height 1.6m. http://abelian.org/vlf/tmp/170813a.jpgE-field pre-amp AD823, http://abelian.org/vlf/prx-e1-1.pdfwhich is located inside the base of the antenna tube. http://abelian.org/vlf/tmp/171129a.jpg http://abelian.org/vlf/tmp/171129b.jpgA few metres away from the antenna is a box with a line driverand power supply for the pre-amp.Цитироватьhttp://abelian.org/vlf/tmp/171130a.jpg http://abelian.org/vlf/tmp/171130a.jpgPre-amp on the left, PSU/driver box on the right. http://abelian.org/vlf/tmp/171127a.jpgA cat5 cable delivers 48V DC to power everything and a balancedtwisted pair downlinks the VLF signal. DC supply pair and VLFpair are isolated at both ends of the cable so there is noground loop.H-field antenna: Orthogonal rectangular loops 20m by 2m by 3 turns(heavy duty mains cable), about 1 ohm and 370uH. http://abelian.org/vlf/p1010111r.jpg http://abelian.org/vlf/p1010102r.jpg2-channel pre-amp, power conversion, and line driver all in onebig box. http://abelian.org/vlf/tmp/171216a.jpg(The little box on the left is for amplitude calibration.)Each channel has pre-amp circuit http://abelian.org/vlf/prx-h1-sim1.pdfand the two line drivers are the same LT1010 circuit as used onthe E-field.Again, cat5 with 48V DC on one pair and VLF signal on two other pairs.All pairs isolated at both ends.--Paul Nicholson--
http://abelian.org/vlf/tmp/171130a.jpg