cisco dish v grid antenna
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Posted by tg on June 6, 2008, 6:29 am
Please log in for more thread options fixed position, not mobile) and I was thinking about a Cisco AIR-ANT3338 solid dish - they're pricey but I expect excellence from Cisco. I've also seen these grid antennas about which are a fraction of the price and yet advertise the same gain levels and narrow beamwidth. Is there an advantage to getting the Cisco or am I just paying for the name? Thanks for any advice. | |||||||||||||||||||
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Posted by ps56k on June 6, 2008, 9:58 am
Please log in for more thread options why ? what will it be locally connected to, and how far is the cable run ? what will it be pointed at ? | |||||||||||||||||||
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Posted by tg on June 6, 2008, 12:04 pm
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> tg wrote:
>> I want to get a high gain directional wlan antenna (it will be
>> mounted in a fixed position, not mobile) and I was thinking about a >> Cisco AIR-ANT3338 solid dish - they're pricey but I expect excellence >> from Cisco. I've also seen these grid antennas about which are a >> fraction of the price and yet advertise the same gain levels and >> narrow beamwidth. Is there an advantage to getting the Cisco or am I >> just paying for the name? Thanks for any advice. >
> why ? > what will it be locally connected to, and how far is the cable run ? > what will it be pointed at ? the dish will be connected to a PCI wireless card in a pc cable run will be about 10 meters or less it will be pointed at another location that has an access point - I want a direct connection to the other building, independent of the internet. | |||||||||||||||||||
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Posted by LR on June 6, 2008, 12:23 pm
Please log in for more thread options tg wrote:
>> tg wrote:
>>> I want to get a high gain directional wlan antenna (it will be
>>> mounted in a fixed position, not mobile) and I was thinking about a >>> Cisco AIR-ANT3338 solid dish - they're pricey but I expect excellence >>> from Cisco. I've also seen these grid antennas about which are a >>> fraction of the price and yet advertise the same gain levels and >>> narrow beamwidth. Is there an advantage to getting the Cisco or am I >>> just paying for the name? Thanks for any advice. >> why ?
>> what will it be locally connected to, and how far is the cable run ? >> what will it be pointed at ? >
direct
> the dish will be connected to a PCI wireless card in a pc > cable run will be about 10 meters or less > it will be pointed at another location that has an access point - I want a > connection to the other building, independent of the internet.
If your PCI card has a power output of approx 13 dBm.
> > The Cisco Antenna is 21dBi. If you use 10 metres of LMR400 to connect them, say 2.5dB loss. That would give you 13+21-2.5 = 31.5dBm which is 11.5 dBm more than you are allowed in the UK. You will need to consider changing antennas on both ends of the link to stay within the limits, and for the link to be viable. | |||||||||||||||||||
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Posted by tg on June 6, 2008, 12:54 pm
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> tg wrote:
ps: I also have a fairly strong access point so I might at some point swap the ends around and connect the dish/grid to my access point. It's just a case of spending my money wisely that's all - I don't want to spend hundreds of pounds on a dish antenna if a grid antenna will do exactly the same thing. | |||||||||||||||||||
> mounted in a fixed position, not mobile) and I was thinking about a
> Cisco AIR-ANT3338 solid dish - they're pricey but I expect excellence
> from Cisco. I've also seen these grid antennas about which are a
> fraction of the price and yet advertise the same gain levels and
> narrow beamwidth. Is there an advantage to getting the Cisco or am I
> just paying for the name? Thanks for any advice.