Hi Stefan, the radiation resistance of a small loop: Ra = (320*Pi^4*A^2)/lambda^4 where A is the loop area in m^2 So for lambda = 630 m and A = 4 m^2 the radiation restistance Ra = 3.17 ľOhm (micro O
Hi Stefan, so far I seem to be the only spotter. 73 Clemens DL4RAJ 2019-01-25 16:58 DK7FC 0.475683 -23 0 JN49ik 0.01 DL4RAJ JN68kj 326 109 2019-01-25 16:52 DK7FC 0.475683 -21 0 JN49ik 0.01 DL4RAJ JN6
Hello Rik, Thanks for your calculations. Looks like the 1000 km distance is already done. Of course i also matched the loop. It uses a small blue ferrite core with just 20mm diameter. The big RF litz
Hello Stefan, my calculations assume that you are using a single turn loop. 73, Rik ON7YD Hello Rik, Thanks for your calculations. Looks like the 1000 km distance is already done. Of course i also ma
Hi Rik, I am using a single turn loop. Just the primary winding of the matching transformer has 9 turns. So the impedance is 81 times higher than the loss resistance of the loop. 73, Stefan Am 25.01.
Hi Stefan, it would be interesting if you could measure the upper and lower frequency where the antenna current drops by 3dB, Then the efficiency of the loop including the influence of its environmen
Hi Markus, I've done some simulations with EZNEC 6+ which can simulate also small loops with reasonable accuracy due to its built in double precision engine which can optionally been engaged. For fre
