Active
Ferrite Rod Antenna for HF, 08.10.2005 OH7SV
Click the pictures to
enlarge
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
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.