This is a Merlin project that shows very little difference due to changes in configuration that Homer expects to consider in modifying his real antenna. This suggest to me that the location of the coil being close to the antenna does not present a worsening affect on the pattern, gain, or angle.
The advantage that Merlin describes comes when the top of the antennas are all at the same height.
Their manual states:
This is the same type of claim that Avanti made for their AstroPlane.
I have checked the dimensions as close as I can to make sure all dimensions and settings are equal from model to model.
I decided to present this Merlin idea in three files.
[ATTACH]8721[/ATTACH]
This model is the Merlin with a full 1/4 wave radiator at 36' feet to the hub.
The tip of the antenna is noted at 535" when tuned for best match at 27.205. This tip height will be used later to compare all antennas like the antenna maker suggest in his claim. See manual previously posted by Booty Monster.
Note the SWR bandwidth = 3.0 mhz <2.0:1 SWR.
[ATTACH]8722[/ATTACH]
1st model is the stock Merlin with top hat and coil at 36' feet to the hub.
2nd model is the stock Merlin raised up 24" to reach the same tip height as the full 1/4 wave model at 535" to the tip.
Note the SWR bandwidths for both are the same at 2.8 mhz <2.1:1 SWR and is reduced a little from the full 1/4 wave model.
[ATTACH]8723[/ATTACH]
1st model is the Merlin with a top hat and without a coil at 36' feet to the hub.
2nd model is the 1st model raised up 17" to reach the same tip height as the full 1/4 wave model at 535" to the tip.
Note the SWR bandwidths are the same for both at 3.0 mhz at <2.0:1 SWR and are back to equal with the full 1/4 wave model.
IMO, this is some evidence that the manufacture is right to make the claim he makes, and the link with the theory described is also correct...except for the very small difference that is noted, which I consider a meaningless difference.
Based on my modeling I consider CBBS is live and well.
