[TenTec] [Ten Tec] OCF Antennas - Which commercial antenna is gest?
steve at karinya.net
Wed Sep 23 07:37:01 EDT 2015
A possible explanation - and from my experience the most likely one - is
that your "antenna" was actually the braid of your coax, top-loaded by
the OCF wire. The differential-mode impedance of a 130ft wire fed at the
25% point is so high on 160m it's almost impossible for any choke/balun
to prevent CM current on the braid. You'd only need about 30ft of coax
for that system to appear as a top-loaded 160m quarter-wave.
On 23/09/2015 11:21, Joe Papworth via TenTec wrote:
> Maybe you can explain why an ocf antenna I once had worked on 160. I called it "My accidental 160 meter antenna."
> It was a full wave on 40, (i.e. 130 ft) and fed with coax, 1/4 wave in from one end. I intended to use it only on 40 but I discovered it was resonant on 160 also.
> Any idea why it worked? Or was it just pure luck?
More information about the TenTec