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Homer, I rechecked the match and resonance for my A/P model and found the following a few mistakes in dimensions, which I fixed. I end up with resonance at 26.800 mhz. Here are my dimensions below. If you get a chance, check your antenna for dimensions and resonance and let me know how it compares.

I used the physical dimensions from my Top One to make my model, and the measurements are a little bit different from that metric takeoff of dimensions I posted some time back. I think maybe you used that metric sheet to build your model, right? They are close, but not exact.

[ATTACH]7148[/ATTACH]

I was a little surprised that my model was so low at center frequency. I checked my real world bandwidth curves, and I note they show resonance about the same, in the area of 26.900. I was using a 50' foot feed line to test also, and that could have made a little difference.

How does your A/P resonance and match look with your analyzer? I included the Source Report that shows the match at the feed point for the model. When I set the model to resonance at 26.800 the SWR shows 1.18:1.

Booty Monster, the mast for the model is attached to the ground.

<blockquote data-quote="Marconi" data-source="post: 364497" data-attributes="member: 903">Homer, I rechecked the match and resonance for my A/P model and found the following a few mistakes in dimensions, which I fixed. I end up with resonance at 26.800 mhz. Here are my dimensions below. If you get a chance, check your antenna for dimensions and resonance and let me know how it compares. &nbsp;I used the physical dimensions from my Top One to make my model, and the measurements are a little bit different from that metric takeoff of dimensions I posted some time back. I think maybe you used that metric sheet to build your model, right? They are close, but not exact.&nbsp;[ATTACH]7148[/ATTACH]&nbsp;I was a little surprised that my model was so low at center frequency. I checked my real world bandwidth curves, and I note they show resonance about the same, in the area of 26.900. I was using a 50&#039; foot feed line to test also, and that could have made a little difference.&nbsp;How does your A/P resonance and match look with your analyzer? I included the Source Report that shows the match at the feed point for the model. When I set the model to resonance at 26.800 the SWR shows 1.18:1.&nbsp;&nbsp;Booty Monster, the mast for the model is attached to the ground.</blockquote>

[QUOTE="Marconi, post: 364497, member: 903"] Homer, I rechecked the match and resonance for my A/P model and found the following a few mistakes in dimensions, which I fixed. I end up with resonance at 26.800 mhz. Here are my dimensions below. If you get a chance, check your antenna for dimensions and resonance and let me know how it compares. I used the physical dimensions from my Top One to make my model, and the measurements are a little bit different from that metric takeoff of dimensions I posted some time back. I think maybe you used that metric sheet to build your model, right? They are close, but not exact. [ATTACH]7148.vB[/ATTACH] I was a little surprised that my model was so low at center frequency. I checked my real world bandwidth curves, and I note they show resonance about the same, in the area of 26.900. I was using a 50' foot feed line to test also, and that could have made a little difference. How does your A/P resonance and match look with your analyzer? I included the Source Report that shows the match at the feed point for the model. When I set the model to resonance at 26.800 the SWR shows 1.18:1. Booty Monster, the mast for the model is attached to the ground. [/QUOTE]

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