Here be finally the drawings for magnetic loop antenna suitable for triangulation and general reception of UVB-76!
It uses somewhat unorthodox approach for matching the feeder, using coaxial cable shield as a tuned antenna element and internal connector as matching transformer secondary winding, so all the comments and improvements about the design are very welcome!
[edit] Playing around with the antenna (works nice!) tonight, I realized that using the long cable to connect to radio inevitably needs the antenna cable shield teminated with ferrite cores. It means, that you either have to go for a short 1-2m wire to your radio, or you have to find ferrite cores and wrap your antenna cable 5-6 turns around it at the antenna side. Longer cable starts to act as an antenna if no ferrites are added and antenna itself goes nuts as a result.
[edit] Playing around with the antenna (works nice!) tonight, I realized that using the long cable to connect to radio inevitably needs the antenna cable shield teminated with ferrite cores. It means, that you either have to go for a short 1-2m wire to your radio, or you have to find ferrite cores and wrap your antenna cable 5-6 turns around it at the antenna side. Longer cable starts to act as an antenna if no ferrites are added and antenna itself goes nuts as a result.
The PDF with building instructions can be found here.
Could you tell us how to calculate the capacitor value for different pipe lenght/loop inductance?
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