That implies a 49:1 Balun being used. However in instances of say 2800, the 49:1 leaves a 7:1 needing yet to be tuned.
Much of what was in the prior thread still applies here, and I like the clarification that the higher ratio baluns on EFHWs work well.
So yes measuring the true "as installed" feed point impedance accounts for all of those "X" factors and balun selection.
The larger problem is often measuring it there.
So many good comments here.
Andy
toggle quoted message
Show quoted text
On Mon, Feb 26, 2024 at 05:22 PM, Ray W8LYJ wrote:
If an antenna is fed at the end it¡¯s an end fed regardless of length. There
are 1/4 wave end fed AM broadcast and 1/2 wave end fed AM broadcast antennas.
The BALUN is not part of the antenna it¡¯s just a fixed antenna tuner with
maybe a common mode choke
If the wire is a half wave then the feed point impedance will be high, 2000
ohms or more. The BALUN turns ratio depends on the antenna feed point
impedance.
Ideally the feed point impedance would be measured and the appropriate BALUN
constructed.
