## Orthogonal polarization???

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• I read this on the M2 website about their 2MXP20 antenna: This antenna is remarkable in that the stacking gain for four antennas can exceed 6 dB. Even using a
Message 1 of 3 , Jan 7, 2008
antenna:

"This antenna is remarkable in that the stacking gain
for four antennas can exceed 6 dB. Even using a single
Horizontal/Vertical relay, You have a moonbounce
package that can outperform larger, linear arrays.
Additional relay switching providing 4 different types
of discrete receiving polarizations: Horizontal,
Vertical, Right Orthogonal, and left Orthogonal bring
you near peak on all signals. Losses from spatial
polarity and Faraday rotation virtually disappear. EME
reliability approaches 100%."

I understand the part about the single relay to switch
from horizontal to vertical. But I don't understand
how additional relays can produce orthogonal
polarization, as the antenna only has horizontal and
vertical elements. Is it some sort of phasing? Could
someone explain how to do this or cite me to a web
article? How complicated is it and is it worth doing?

Thanks and 73, Bill NZ5N
• Hi Bill, You can get right or left orthogonal polarization by introducing a 90 deg phase shift to either the vertical or horizontal antennas. Just add another
Message 2 of 3 , Jan 7, 2008
Hi Bill,

You can get right or left orthogonal polarization by introducing a 90 deg phase shift to either the vertical or horizontal antennas.
Just add another relay to switch in a 1/4 wave (90 deg) piece of transmission line.

Hope this helps.

73,

Barry VE3CDX/W7

From: wsjtgroup@yahoogroups.com [mailto:wsjtgroup@yahoogroups.com] On Behalf Of billdz.geo
Sent: Monday, January 07, 2008 1:48 PM
To: wsjtgroup@yahoogroups.com
Subject: [wsjtgroup] Orthogonal polarization???

antenna:

"This antenna is remarkable in that the stacking gain
for four antennas can exceed 6 dB. Even using a single
Horizontal/Vertical relay, You have a moonbounce
package that can outperform larger, linear arrays.
Additional relay switching providing 4 different types
of discrete receiving polarizations: Horizontal,
Vertical, Right Orthogonal, and left Orthogonal bring
you near peak on all signals. Losses from spatial
polarity and Faraday rotation virtually disappear. EME
reliability approaches 100%."

I understand the part about the single relay to switch
from horizontal to vertical. But I don't understand
how additional relays can produce orthogonal
polarization, as the antenna only has horizontal and
vertical elements. Is it some sort of phasing? Could
someone explain how to do this or cite me to a web
article? How complicated is it and is it worth doing?

Thanks and 73, Bill NZ5N

• http://www.sportscliche.com/wb2fko/w07/winter_2007.html Thank you to those who submitted logs. We ll do it again next December. Mike WB2FKO
Message 3 of 3 , Jan 18, 2008
http://www.sportscliche.com/wb2fko/w07/winter_2007.html

Thank you to those who submitted logs. We'll do it again next December.

Mike WB2FKO
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