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FWIW circular polarity is NOT as simple as feeding a vertical element and a horizontal element at the same time. There MUST be a phase delay to one element or the other. Leading the vertical element will give you right hand circular but leading the horizontal element will give you left hand circular. I think I got that right. If not it is the opposite. Simply feeding both elements in phase will NOT give you circular polarity but rather a combined vertical and horizontal which is NOT circular polarity. For terrestrial comms one station needs to be RHC bit the other needs to be LHC. IMHO completely forget the idea of circular on 11m. It is useless and more to it than you think. Circular pays off in VHF and UHF satellite comms where the signal may be subject to rotation due to spacecraft spin. Not saying it is not possible but rather impractical on 11m. FWIW my next experiment might be a circular polarized helix antenna for 70cm. MUCH easier and MUCH more practical on 70cm than 11m.

<blockquote data-quote="Captain Kilowatt" data-source="post: 725688" data-attributes="member: 39"><p>FWIW circular polarity is NOT as simple as feeding a vertical element and a horizontal element at the same time. There MUST be a phase delay to one element or the other. Leading the vertical element will give you right hand circular but leading the horizontal element will give you left hand circular. I think I got that right. If not it is the opposite. Simply feeding both elements in phase will NOT give you circular polarity but rather a combined vertical and horizontal which is NOT circular polarity. For terrestrial&nbsp; comms one station needs to be RHC bit the other needs to be LHC. IMHO completely forget the idea of circular on 11m. It is useless and more to it than you think. Circular pays off in VHF and UHF satellite comms where the signal may be subject to rotation due to spacecraft spin.&nbsp; Not saying it is not possible but rather impractical on 11m. FWIW my next experiment might be a circular polarized helix antenna for 70cm. MUCH easier and MUCH more practical on 70cm than 11m.</p></blockquote><p></p>

[QUOTE="Captain Kilowatt, post: 725688, member: 39"] FWIW circular polarity is NOT as simple as feeding a vertical element and a horizontal element at the same time. There MUST be a phase delay to one element or the other. Leading the vertical element will give you right hand circular but leading the horizontal element will give you left hand circular. I think I got that right. If not it is the opposite. Simply feeding both elements in phase will NOT give you circular polarity but rather a combined vertical and horizontal which is NOT circular polarity. For terrestrial comms one station needs to be RHC bit the other needs to be LHC. IMHO completely forget the idea of circular on 11m. It is useless and more to it than you think. Circular pays off in VHF and UHF satellite comms where the signal may be subject to rotation due to spacecraft spin. Not saying it is not possible but rather impractical on 11m. FWIW my next experiment might be a circular polarized helix antenna for 70cm. MUCH easier and MUCH more practical on 70cm than 11m. [/QUOTE]

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