wlan_fanatic4
join:2006-12-19
Gallipolis, OH
| Wireless AP Settings (?)
For a 2.4GHz connectorized access point hooked up to a 12dBi omnidirectional antenna, what wireless settings should I be using?
802.11b? 802.11b+g?
As far as the channel, I should be on the one that I see the best signal strength on, right?
Power settings?
I'm using a DLB2500 and one of their 12dBi omnis (with no downtilt). Any pointers?
Also, should I be able to pick up a signal everywhere the CPE would with just a wireless USB adapter? Since the antenna should be "shouting" everywhere it can, shouldn't the wireless USB adapter pick it up?
Thanks in advance! |
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA | What distance are you trying to cover. |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| reply to wlan_fanatic4
said by wlan_fanatic4  :Also, should I be able to pick up a signal everywhere the CPE would with just a wireless USB adapter? Since the antenna should be "shouting" everywhere it can, shouldn't the wireless USB adapter pick it up? Not at all. A USB adapter has a tiny 1/4 inch sized antenna that can barely reach an adjoining room. The CPE would have a much higher gain antenna and probably more power from the radio as well. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
 ·TekSavvy Solutions..
| reply to wlan_fanatic4
said by wlan_fanatic4 :802.11b? 802.11b+g? Use 802.11b only for longest range outdoor operation.
Use 802.11g only for high throughput at shorter range or for indoor operation.
said by wlan_fanatic4 :I should be on the one that I see the best signal strength on, right? No, you should select a channel in which you see the lowest noise during a site survey. Do this often and change AP channel - most CPEs will follow automatically.
said by wlan_fanatic4 :Power settings? Enough EIRP ( transmit power + antenna gain ) so that the you typically see about 20dB higher signal than noise during site survey.
said by wlan_fanatic4 :I'm using a DLB2500 and one of their 12dBi omnis (with no downtilt). Any pointers? At full power, it will violate FCC rules. Turn down to 200mW for very clean operation.
said by wlan_fanatic4 :should I be able to pick up a signal everywhere the CPE would with just a wireless USB adapter? The answer depends on the RF specifications of the Ethernet or USB device and the antenna gain. Some USB devices are high power with external antenna connectors, but they cost almost same as Ethernet CPEs and you have extra hassle of PC software.
said by wlan_fanatic4 :Since the antenna should be "shouting" everywhere it can, shouldn't the wireless USB adapter pick it up? Depends on your system design. There is a limited range with 95% of available USB adapters since they have poorer RF specs. |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| said by lutful :said by wlan_fanatic4 :I'm using a DLB2500 and one of their 12dBi omnis (with no downtilt). Any pointers? At full power, it will violate FCC rules. Turn down to 200mW for very clean operation. At 200mW you would be below maximum EIRP and your range could suffer. 250mW at the base of the antenna would give you the max EIRP. Don't forget to factor pigtail, connector, and coax losses, so actual radio power could be higher yet. |
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bito
Premium
join:2001-10-08
Atlanta, GA
| reply to lutful
The DLB2500 has an output of 250mw, so a 12dbi omni is at the power limits. The overall output is below the limit if you include connector and cable loss.
I think everything else has been covered 
Caleb |
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Check Again
@rr.com
| 30 Db would be the legal max for PtMpt. Using a 12 Db omni and a USB dongle for a client device would strongly imply the intent of having multiple clients. Even Lutful's 200Mw is a bit over the legal max. (But who really gives a shit about legal ?)  |
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dongato17
VIP
join:2000-07-28
Atlanta, GA
| The PtMP rules for FCC are 30dBm max output power at the antenna port and 6dBi antenna gain (or 36dBm max EIRP). For ever dB you decrease output power, you can increase antenna gain by 1dB. So if the output power is 24dBm... 30-24=6 + 6 = 12dBi is the max antenna gain you can use.
For PtP (CPE end), the rule is that for every dB you decrease output power from 30dBm at the antenna port, you can increase antenna gain by 3dB.
And lots of people care about legal.
-Hal
--
Harold Bledsoe
Deliberant Wireless
»www.deliberant.com |
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jdmarti1
Jack
join:2004-06-15
Oilton, OK
| quote:
Even Lutful's 200Mw is a bit over the legal max.
You need to learn some basic math. 200mW =23.01dBm. 30-23=7, 6+7=13. So with 200mW and a 12dbi antenna, you are 1 dB under legal limits without including cable loss and connectors.
quote:
(But who really gives a shit about legal ?)
Now you are just showing your ignorance. I would imagine that nearly everybody on this forum gives a flip about being legal.
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»magicwisp.com |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to dongato17
said by dongato17 :The PtMP rules for FCC are 30dBm max output power at the antenna port and 6dBi antenna gain (or 36dBm max EIRP). Thanks Caleb, Hal and jdmarti1 for posting correct EIRP info.
BTW I had mistakenly assumed DLB2500 was the 500mW model but that is of course the DLB2700.  |
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LLigetfa
join:2006-05-15
Fort Frances, ON
| said by lutful :Thanks Caleb, Hal and jdmarti1 for posting correct EIRP info. So, was what I posted not correct? |
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dongato17
VIP
join:2000-07-28
Atlanta, GA
| Lutful assumes that you already know that Canadians are always right, hence there is no need to verify your response.
--
Harold Bledsoe
Deliberant Wireless
»www.deliberant.com |
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