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Old 06-03-2004   #1 (permalink)
mish
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Join Date: May 2004
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Antenna Gain
trying to get an estimate of my homemade 18 element omni aerial
not sure how to calculate this info
i tested both my aerial and a aerial with known dbi value all with cisco gear at UNI these are the results

connected to Cisco Aironet 1200 AP in roof via Cisco Aironet 350 PCI card
not sure of its alignment
when testing both aerials had them horizonaly placed on top of the computer screen

Testing on cisco client software using site survey tool these are the results

tested on 5.14dbi CUSHCROFT OMNI
Signal Strenth (DBm) ranging between -49 and -55
Noise Level (DBm) : -97
Signal to Noise Ratio: 41

tested on my homemade 18 element Omni
Signal Strenth (DBm) : -47
Noise Level (DBm) : -97
Signal to Noise Ratio: 34

Testing on Netstumbler 4

tested on 5.14dbi CUSHCROFT OMNI
SNR: 47
Signal+ : -46
Noise: -100
SNR+ : 54

tested on my homemade 18 element Omni
SNR: 44
Signal+ : -46
Noise: -100
SNR+: 54

any thought on what dbi rateing my omni is giving ? cheers
Last edited by mish : 06-03-2004 at 06:44 PM.
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Old 06-03-2004   #2 (permalink)
Thorn
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Quote:
Originally Posted by mish
trying to get an estimate of my homemade 18 element omni aerial
not sure how to calculate this info
i tested both my aerial and a aerial with known dbi value all with cisco gear at UNI these are the results

connected to Cisco Aironet 1200 AP in roof via Cisco Aironet 350 PCI card
not sure of its alignment
when testing both aerials had them horizonaly placed on top of the computer screen

Testing on cisco client software using site survey tool these are the results

tested on 5.14dbi CUSHCROFT OMNI
Signal Strenth (DBm) ranging between -49 and -55
Noise Level (DBm) : -97
Signal to Noise Ratio: 41

tested on my homemade 18 element Omni
Signal Strenth (DBm) : -47
Noise Level (DBm) : -97
Signal to Noise Ratio: 34

Testing on Netstumbler 4

tested on 5.14dbi CUSHCROFT OMNI
SNR: 47
Signal+ : -46
Noise: -100
SNR+ : 54

tested on my homemade 18 element Omni
SNR: 44
Signal+ : -46
Noise: -100
SNR+: 54

any thought on what dbi rateing my omni is giving ? cheers
Essentially, it looks like your getting the same results. Therefore it would seem to be about 5dBi.
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