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600 posts

Ultimate Geek
+1 received by user: 25


Topic # 85594 21-Jun-2011 23:36
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Its surprising the number of UHF antennas I see on peoples rooves in Auckland which are pointed at the Sky Tower and using Horizontal polarisation, or even worse pointed else where not at Waiatarua or the Sky Tower at all, eg out towards sea.  Im assuming there must be a few installers out there lacking vital knowledge.

A friend of mine has Freeview HD on his Mac, uses a small 10cm omni directional whip antenna, he has line of sight to Waiatarua but not to the Sky Tower.  As it turned out his antenna was mounted Verticaly on the window using suction cup and he was only getting around 55% snr.  I told him to change it so its pointing away from window Horizontally and parallel to Waiatarua.  His snr then jumped up to around 85% and the picture no longer pixilated.

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727 posts

Ultimate Geek
+1 received by user: 7


  Reply # 484095 22-Jun-2011 01:40
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OK!
Just one question: I've never seen the word "parallel" used like this; how can something be parallel to a point?



600 posts

Ultimate Geek
+1 received by user: 25


  Reply # 484421 22-Jun-2011 15:05
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I mean like side on, so the whip antenna is not pointing at Waiatarua but is side on.  What ever the "terminology" is for that, im not a great fan of maths.  I just know how to install antennas.

 
 
 
 


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727 posts

Ultimate Geek
+1 received by user: 7


  Reply # 484428 22-Jun-2011 15:16
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Ah! Something like at right angles, or perpendicular, or even orthogonal to the line to the transmitter would be do the trick I think.

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