I believe that Britain has used both vertical and horizontal polarity for their television broadcasts for decades. It is an easy way to reuse frequencies in adjacent markets with minimum interference. Market A receive antennas will be vertically polarized and aimed at their local transmission cluster, while market B antennas will be horizontally polarized and aimed at their local transmission cluster.
There was a proposal once to use circular polarity for UHF television. Using Right Hand Circular, for example, could be received by a RH Circular antenna. A reflection off of a tall building or other hard surface would create a mirror image reflection, or a Left Hand Circular signal, that would be rejected by the Right Hand Circular receive antenna.
However, a horizontally polarized signal remains horizontally polarized when reflected off of a building, and ditto for a vertically polarized signal.
John----- Original Message ----- From: "Bob Miller" <robmxa@xxxxxxxxx>
It seems that the BBC is working on an addition to Freeview where they would broacast a vertical signal as well as the horizontal one. Anyone have any thoughts on this? I believe that a bounced signal changes polarity, would that be an insurmountable problem? Seems a receiver could still pick apart the signals to me. Bob Miller ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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