Author Topic: wifi/antenna coverage area (Read 740 times)

PowerAces · « **on:** June 03, 2011, 09:44:40 PM »

mga bro/sis.., pano po ba e.compute or calculation para malaman ang actual/estimated coverage area or distance ng isang wifi/antenna? example yun wifi/antenna w/ Vertical/horizontal beamwidth mo 30/360 degree, transmitting power 5 watts, how far po ang kaya niya e.reach..

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Philippine Electronics Forum · « **on:** June 03, 2011, 09:44:40 PM »

rdpzycho · « **Reply #1 on:** June 03, 2011, 10:46:45 PM »

with that antenna, ang assumption ko around 6 to 9 dBi ang antenna gain mo.

5W is 37dBm, AFAIK, acceptable receiver level is around -70dBm. EIRP is around 37dBm + 9dB or 46dBm. Free Space Loss at 2.4GHz is at 100dB per 1km, around 115dB at 6km. 46dBm - 115dB = -69dBm, so ideally, dapat sakop niya within 6km. kung may mga pader bababa pa 'yan, tapos meron ding range na malaki na ang lag ng WiFi.

Philippine Electronics Forum · « **Reply #1 on:** June 03, 2011, 10:46:45 PM »

rdpzycho · « **Reply #2 on:** June 03, 2011, 11:00:51 PM »

BTW, kung 'yung receivers nga pala ay ordinary laptops, computers lang din, 'di rin masasagad 'yung 6km kahit open space dahil 'di naman nila kakayaning mag-transmit pabalik doon sa router.

Philippine Electronics Forum · « **Reply #2 on:** June 03, 2011, 11:00:51 PM »

PowerAces · « **Reply #3 on:** June 04, 2011, 09:27:37 AM »

opo ordinary laptop lang po ang receiver, bali test lang namin yung how far yun maabot yun signal nya..so dun sa binigay ko na details masasabi natin na max range niya nasa 6km lang po bah?
ang antenna po nka install 9 metes above the ground if nasa baba ka ng tower possible po ba magka receive kapa ng signal?

Philippine Electronics Forum · « **Reply #3 on:** June 04, 2011, 09:27:37 AM »

RiDdLeR??? · « **Reply #4 on:** June 04, 2011, 09:41:41 AM »

Like what RD said, bale wala kung malakas ang transmitter ng base kung mahina ang transmitter ng clients, you are still limited by the range of your clients.

As your vertical beamwidth is 30 degrees, theoretically wala ka dapat marereceive na signal if the antenna is placed 9 meters high and the laptop is directly below it. But the signal can find otherways to leak in/out under the antenna.

Philippine Electronics Forum · « **Reply #4 on:** June 04, 2011, 09:41:41 AM »

rdpzycho · « **Reply #5 on:** June 04, 2011, 12:54:37 PM »

Tama si sir alyas. Broadcast antennas have electrical downtilt, cellular ones both have electrical and mechanical downtilt. Based on trigonometry lang yung angles.

Theoretically mapapaabot mo nga yan ng 6km, pero yung clients mo can only transmit within 100m or even less. Minsan kasi negative gain ang antenna ng laptop.

PowerAces · « **Reply #6 on:** June 06, 2011, 05:11:14 PM »

tama po..malayo talaga area of coverage niya, and even below the antenna still im able to get the signal and still malakas parin..., nag field test kami kanina at yun nakita ko nga na kaya niya abutin ang ganun ka layo...salamat po sa inyo bro..:-) :-)

Philippine Electronics Forum · « **Reply #6 on:** June 06, 2011, 05:11:14 PM »

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