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74 posts

Master Geek
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Topic # 87427 28-Jul-2011 18:16
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Hi all

Just finished a trip around the North Island and was wondering whether someone can explain in what case Vfone (or T/Com) use Omni Antennas as opposed to the standard panel antennas? What benefit do the omni's provide over panels? 

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185 posts

Master Geek
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  Reply # 504739 10-Aug-2011 23:43
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The Omni sites used to be Telecoms old analogue network i think - and obviously are still used in many areas for Telecoms newer technology. I think Vodafones sites are all panel and cylinder (from what ive seen) I also notice most Telecom sites constructed since the launch of CDMA in 2001 roughly are panel sites. I could be wrong and would welcome to be corrcted but i think Telecom are the only network that have operated Omni sites in recent times :)

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Ultimate Geek
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  Reply # 504752 11-Aug-2011 01:00
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Main advantage would be 360 degree coverage from a single carrier, resulting in lower cost for radio equipment, antennas and feeders. This would be suitable for a low capacity rural site, some in-building applications or some other small cell filling a gap in coverage.





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Uber Geek
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  Reply # 504758 11-Aug-2011 01:50
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Omni's can also pick up interference from all directions, where as a panel will limit the ability to pick up interference to about 120 degrees.

Omnis dont cover as much of an area as panels, so when you are looking at 1ghz+ frequencies, it makes sense to use a much stronger sector (panel) antenna. At higher frequencies, the loss of signal as it travels through the air is much greater.

So if you transmit at 5 watts at 900mhz it might go 5km, but at 1800mhz it will peobably only go half that. So they need a stronger antenna to compensate and a sector is better at doing that.




Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




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