Isn't this why AM broadcast stations, particularly 50KW clear-channel
stations, employ base-fed half-wave verticals? They still use radial
fields too I think. I recall [from years ago] that KFI's TX [650KHz]
was in Buena Park CA and the tower was around 700ft tall. BW of a stick
like that is pretty narrow, uncompensated, less than the BW of the signal.
When I saw the original post, I knew it would stimulate a reply-storm. :-)
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org
On 10/1/2013 2:43 PM, Ron D'Eau Claire wrote:
I disagree. Barry has it right. The radiation resistance of the radiator is
independent up the ground resistance. That's why a 1/2 end fed wire with
it's very high resistance is highly efficient against a given ground system
compared to a 1/4 wave long or less wire.
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