You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

You did see it correctly Homer. Additionally the NTO's increase in gain may be attributed to its increased height, and the fact that its model shows more current flowing on the mast below which can unpredictably add to gain, but usually at higher angles.

Model #4 below is the same as the previous A/P model. I took this model and fixed it to improve the excessive currents on the mast that the hoop did not decouple, and then made it my model #5.

By improving these currents termination at the hoop, for the bottom 1/4 wave portion of the mast inside the two down radials, we can see improvement in the model. The antenna now produces a pattern that is more like the traditional EF 1/2 wave. Its current pattern also shows a better balance of currents across the 12' foot length for the radiator. This model also produces a wider pattern wave front near the horizon with higher gain in the secondary lobe and with very little low angle null area.

[ATTACH]7128[/ATTACH]

<blockquote data-quote="Marconi" data-source="post: 364355" data-attributes="member: 903">You did see it correctly Homer. Additionally the NTO&#039;s increase in gain may be attributed to its increased height, and the fact that its model shows more current flowing on the mast below which can unpredictably add to gain, but usually at higher angles.&nbsp;Model #4 below is the same as the previous A/P model. I took this model and fixed it to improve the excessive currents on the mast that the hoop did not decouple, and then made it my model #5. &nbsp;By improving these currents termination at the hoop, for the bottom 1/4 wave portion of the mast inside the two down radials, we can see improvement in the model. The antenna now produces a pattern that is more like the traditional EF 1/2 wave. Its current pattern also shows a better balance of currents across the 12&#039; foot length for the radiator. This model also produces a wider pattern wave front near the horizon with higher gain in the secondary lobe and with very little low angle null area.&nbsp;[ATTACH]7128[/ATTACH]</blockquote>

[QUOTE="Marconi, post: 364355, member: 903"] You did see it correctly Homer. Additionally the NTO's increase in gain may be attributed to its increased height, and the fact that its model shows more current flowing on the mast below which can unpredictably add to gain, but usually at higher angles. Model #4 below is the same as the previous A/P model. I took this model and fixed it to improve the excessive currents on the mast that the hoop did not decouple, and then made it my model #5. By improving these currents termination at the hoop, for the bottom 1/4 wave portion of the mast inside the two down radials, we can see improvement in the model. The antenna now produces a pattern that is more like the traditional EF 1/2 wave. Its current pattern also shows a better balance of currents across the 12' foot length for the radiator. This model also produces a wider pattern wave front near the horizon with higher gain in the secondary lobe and with very little low angle null area. [ATTACH]7128.vB[/ATTACH] [/QUOTE]

Top Bottom