Aerials and preselectors for AM and DRM
For initial experimenting and radio listening with a DIY short-wave or DRM receiver, a simple rod aerial or piece of wire is sufficient. But it’s only natural to want something better. This article gives you the right tips for better reception.In the UHF band, radio waves propagate essentially in a line-of-sight manner, similar to light, and this limits their reception to a range of around 100 km, depending on aerial height. However, radio waves at frequencies below 30 MHz show completely different behaviour, which makes a significantly larger reception range possible. Of course, the complex propagation mechanisms in this frequency range also lead to special problems, such as dependence on the time of day,
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.