Joe,
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.
Steve G3TXQ
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?
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|