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PDL2

I attach the US patent for the PDL2. Loop size and element spacing for the driven and director elements can be found in the patent.

The driven element of the PDL2 has a full wave of wire. The four 'spreaders' of the driven element plus the 'basket' on which the separate gamma matches connect, form two (sort of) electrically isolated folded dipoles. Each dipole is orientated in the vertical or horizontal plane. Each dipole end connects directly to the loop of wire at current maximas. The half wave dipole length is made possible by ensuring that the overall length of the two 'spreader' elements for each polarisation are approximately 70.7% with the remaining 29.3 % found in the 'basket'.

W8JI says that if you attempt to get vertical and horizontal polarisation by feeding at wire corners you will come unstuck because one of the polarisations will present a very high impedance.
Thats all I know about the PDL2 because its operation is way above my understanding.

I tried to model the PDL2 within EZNEC but came unstuck because I do not know how to model vertical and horizontal feeds and their connection into a loop of wire. Has anyone tried to model this or even better, is the EZNEC file available?

<blockquote data-quote="warrior369" data-source="post: 364831" data-attributes="member: 19698">PDL2I attach the US patent for the PDL2. Loop size and element spacing for the driven and director elements can be found in the patent.The driven element of the PDL2 has a full wave of wire. The four &#039;spreaders&#039; of the driven element plus the &#039;basket&#039; on which the separate gamma matches connect, form two (sort of) electrically isolated folded dipoles. Each dipole is orientated in the vertical or horizontal plane. Each dipole&nbsp; end connects directly to the loop of wire at current maximas. The half wave dipole length is made possible by ensuring that the overall length of the two &#039;spreader&#039; elements for each polarisation are approximately 70.7% with the remaining 29.3 % found in the &#039;basket&#039;. W8JI says that if you attempt to get vertical and horizontal polarisation by feeding at wire corners you will come unstuck because one of the polarisations will present a very high impedance. Thats all I know about the PDL2 because its operation is way above my understanding.I tried to model the PDL2 within EZNEC but came unstuck because I do not know how to model vertical and horizontal feeds and their connection into a loop of wire. Has anyone tried to model this or even better, is the EZNEC file available?</blockquote>

[QUOTE="warrior369, post: 364831, member: 19698"] [b]PDL2[/b] I attach the US patent for the PDL2. Loop size and element spacing for the driven and director elements can be found in the patent. The driven element of the PDL2 has a full wave of wire. The four 'spreaders' of the driven element plus the 'basket' on which the separate gamma matches connect, form two (sort of) electrically isolated folded dipoles. Each dipole is orientated in the vertical or horizontal plane. Each dipole end connects directly to the loop of wire at current maximas. The half wave dipole length is made possible by ensuring that the overall length of the two 'spreader' elements for each polarisation are approximately 70.7% with the remaining 29.3 % found in the 'basket'. W8JI says that if you attempt to get vertical and horizontal polarisation by feeding at wire corners you will come unstuck because one of the polarisations will present a very high impedance. Thats all I know about the PDL2 because its operation is way above my understanding. I tried to model the PDL2 within EZNEC but came unstuck because I do not know how to model vertical and horizontal feeds and their connection into a loop of wire. Has anyone tried to model this or even better, is the EZNEC file available? [/QUOTE]

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