Re: [WISPA] 2dbi vs 3dbi vs 5 dbi vs 100mw vs 400mw

[Jack Unger]

Going from 20 dB to 26 dB will allow the AP to be heard (with the same reliability) at double the distance away. Yes. If the client power (actually the client EIRP which includes the antenna gain) stays the same then the "uplink" distance from client to AP will still be the same. Yes, increasing the number of APs is one possible solution. Another is to use a higher-gain (more directional) antenna on the AP recognizing that when you increase the AP antenna gain in one direction, you are reducing the gain (and the coverage) in all other directions. jack On 11/13/2014 11:10 AM, Colton Conor wrote: So going from a regular powered 100mw (20db) to a high powered 400mw (26db) is a 6db increase in output power. So you are saying going from regular to high powered is a double in coverage size? Doesn't increasing the power output at the AP only increase how loud the AP can "shout" which in term dictates how far the receiver can hear from? If the client can't shout back does this do any good?  Most client devices today like iPads, Smartphones, and some laptops can't be modified to increase their antenna gain or power output. So the only option is to increase the numbers of APs, or the transmit power/antennas at the AP right?  On Thu, Nov 13, 2014 at 12:25 PM, Jack Unger <jun...@ask-wi.com> wrote: To double the communications distance (everything else holding steady) requires an additional 6 dB. Knowing this, you can do the math with the various antenna gains and power levels to determine performance. Regards, Jack Unger WISPA FCC Technical Consultant On 11/13/2014 10:15 AM, Colton Conor wrote: We are comparing multiple SOHO routers and modems that have the same Broadcom chipsets. All of them have 802.11N 2x2 configuration. The only differences between them are if they have internal or external antennas and the gain of the antennas (either 2, 3, or 5dbi ratings). In addition, some sell a high powered wifi radio (400mw) while others have the basic (100mw). How much a difference does each of these hardware features make in overall wifi performance? _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless -- Support Honest Gil Fulbright for Senate <http://honestgil.com/#up> Jack Unger - President, Ask-Wi.Com, Inc. Author (2003) - "Deploying License-Free Wireless Wide-Area Networks" Serving the WISP Community since 1993 760-678-5033 jun...@ask-wi.com _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless -- Support Honest Gil Fulbright for Senate <http://honestgil.com/#up> Jack Unger - President, Ask-Wi.Com, Inc. Author (2003) - "Deploying License-Free Wireless Wide-Area Networks" Serving the WISP Community since 1993 760-678-5033 jun...@ask-wi.com

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