Monday, May 1, 2017

Ferrite Rod TX Antennas-G3XBM QRP WEBSITE. Post #1118.

Ferrite Rod TX Antennas-G3XBM QRP WEBSITE
(https://sites.google.com/site/g3xbmqrp3/antennas/ferrite_tx).
Author:  Roger (G3XBM).
Accessed on 01 May 2017, 20:30 hrs, UTC.
Please click link to read the full article.

Comment:

I found this intriguing article from Roger (G3XBM) while I was searching for some experimental antenna ideas.  I must admit that using a ferrite rod as a transmitting antenna never really crossed my mind.  I've used ferrite rods as antennas in small transistor radio projects, but never in a transmitting capacity.

Roger's ferrite rod antenna consists of 80 turns of 0.5 mm diameter wire with a 365 pF air-spaced variable capacitor in parallel with about 60 turns of the wire and in the 50 ohm range of one of the lower taps.  Roger says he was able to get a 1:1 SWR on 40 meters using a Yaesu-817 running 5 watts of power.

Roger adds that the antenna was tried in a vertical position, and received many reports of his WSPR signal throughout Europe.

Roger has provided several helpful photographs and recorded data to help you build your own ferrite rod transmitting antenna.  This should be an easy weekend project for those of us into antenna experiments.

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Aloha es 73 de Russ (KH6JRM)