Dan Koerner
join:2000-08-05
Clinton, TN
| reply to gmichels
Re: [Help Me] Antennas suggestion
Any omni-directional antenna with a gain greater than 2 dBi is a collinear array, i.e., it's 1/2 wavelength elements are aligned end-to-end with a 1/2 wavelength phasing device between each element.
A 5 dBi vertical antenna has 2x the ERP (Effective Radiated Power) of a 2 dBi vertical antenna along any radial in their respective ground planes. This works both directions, sending and receiving. I have no idea as to the signal strength indicator calibration of the wireless cards... each manufacturer probably has a different system of measurement.
BTW, I really hate dBi (isotropic gain) references. The 0 dBi reference antenna is a hypothetical antenna that radiates or receives equally in all directions, i.e., it's radiation pattern is equal at all points on a surrounding sphere. dBi numbers are not real... just computer generated number by some unknown algorithm and a theoretical design. See »www.its.bldrdoc.gov/fs-1037/dir-···0317.htm. It is just to easy to hype a number that cannot be measured/proofed.
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Dan |
