Active Ferrite Rod Antenna for HF, 08.10.2005 OH7SV

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Ferrite rod antenna prototype in action

Ferrite rod antenna, close view

Ferrite rod antenna, preamplifier schematics

Enclosed Active Ferrite Antenna for 3 MHz...12 MHz, 07.11.2005 OH7SV
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The red connector is for an optional external antenna wire and the black connector is for a ground wire. The red is wired to secondary winding and the black is connected to the circuit ground plane. Additionally two by-pass capacitors (100n) are soldered from different +9V locations to the GND plane for stability in high gain setting. The ferrite is Amidon R61-050-300. Click the pictures.