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80m Projects - Various Antennas

Click to enlargeActive Ferrite Rod Antenna for HF by 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.
http://www.saunalahti.fi/hohtola/ham/active-ferrite-rod-antenna/active-ferrite-rod-antenna.html

Click to enlargeActive Ferrite Rod Antenna by OH2NLT
Matti OH7SV did some tests to find out if Active Ferrite Rod antenna can be build for 80 / 40 Meter ham band reception.
I did boxed version of this antenna for practical tests. Antenna construction presented with few pictures.
http://www.kolumbus.fi/juha.niinikoski/Ferrite_antenna/Ferrite_antenna.htm

Click to enlargeThis ferrite rod antenna is a quick and dirty project. Although it looks very attractive it is not very sensitive. I recommend you to add a peamplifier with a gain of e.g. 20 dB, otherwise you can listen only strong stations.
http://www.saunalahti.fi/~hohtola/ham/ferrite-rod-antenna/P8220048.JPG


Creation date : 07/03/2019 @ 18:14
Last update : 09/03/2019 @ 09:28
Category : 80m Projects
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