Bob, after i posted my model that I started with above...I got to thinking that the gain seemed inflated, even though it agreed with what Avanti reported years earlier.
I didn't remember the source of the model I started with, and I didn't recall ever talking with DB about my results. However, I dated the model to 07/25/17, and added DB's handle to the title. I'm dangerous when I get to thinking. Now I vaguely remember, at the time, I likely used a model of an A/P I had on file, and modified it using the feed point location that DB had been talking about.
I just looked back at some of my models with the feed point location where I thought it should be...and those models, showed gains closer to 2.25 - 2.50 dbi, instead of 4.58 dbi like I reported in my post #14 above. Next, I will use another old A/P model showing a match with values closer to R=74.85, X= -0.6668 ohms, SWR = 1.497. I would think this is much closer to what a vertical CFHW antenna should indicate.
(Edit): I will tune the model here and get a better match if I can. It may also effect the gain and/or the TOA...just not sure yet.
Sorry, IMO this results from bias, and shows what bias can do to one's thinking...if they get locked-into some dubious ideas.
Do you think Avanti was probably puffing their antenna performance back then?
So, discount the models I posted earlier. I will wait and see if Tagra answers my email.
Sorry I jumped the gun!
I didn't remember the source of the model I started with, and I didn't recall ever talking with DB about my results. However, I dated the model to 07/25/17, and added DB's handle to the title. I'm dangerous when I get to thinking. Now I vaguely remember, at the time, I likely used a model of an A/P I had on file, and modified it using the feed point location that DB had been talking about.
I just looked back at some of my models with the feed point location where I thought it should be...and those models, showed gains closer to 2.25 - 2.50 dbi, instead of 4.58 dbi like I reported in my post #14 above. Next, I will use another old A/P model showing a match with values closer to R=74.85, X= -0.6668 ohms, SWR = 1.497. I would think this is much closer to what a vertical CFHW antenna should indicate.
(Edit): I will tune the model here and get a better match if I can. It may also effect the gain and/or the TOA...just not sure yet.
Sorry, IMO this results from bias, and shows what bias can do to one's thinking...if they get locked-into some dubious ideas.
Do you think Avanti was probably puffing their antenna performance back then?
So, discount the models I posted earlier. I will wait and see if Tagra answers my email.
Sorry I jumped the gun!
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