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Dangerous antenna?
Posted: Thu Nov 11, 2004 10:41 am
by Coussa
Can the 2G/AO8 2.4GHz 7dBi omnidirectional antenna prove to be dangerous if human beings are around it? If it is used in as a hotspot antenna in a cafe or restaurant, would it be a viable solution? Or would it be better to pruchase a cheaper SMA-connector antenna?
Posted: Thu Nov 11, 2004 5:07 pm
by trystan
Apart from poking you in the eye, no.
Posted: Thu Nov 11, 2004 10:52 pm
by lastguru
AKAIC your mobile phone hurts more than any [consumer] omni antenna.
Posted: Fri Nov 12, 2004 9:18 am
by normis
Posted: Sun Nov 14, 2004 5:18 am
by airwave
Go to
http://n5xu.ae.utexas.edu/rfsafety/
You can calculate safe RF exposure limits that apply for amateur radio use.
A good guideline to go by.
I wouldn't worry about the flea power coming from the devices. Like the other guy said, your cell phone is putting out 200mw right at your head.
Posted: Wed Nov 17, 2004 4:39 am
by Borage
Like the other guy said, your cell phone is putting out 200mw right at your head.
Depending on the cell phone and distance to the base station, RF output can be as high as 2 Watt, but the Specific Absorption Rates (SAR) value from Coussas hotspot antenna is nothing compared to talking in a cell phone without use of hands-free devices.
Coussa, if you are concerned about RF, there are a simple steps you can take to minimize your RF exposure. You can place more distance between peoples body and the source of the RF, as the exposure level drops off dramatically with distance.
Posted: Sun Nov 21, 2004 4:42 am
by airwave
No portable cell phone here in the US puts out 2watts. If it did, your battery would be dead in no time.
Max output is usually 300mw, look at the manuals for various phones.
Only the old analog "bag" phones had a PEP output of 3watts.
Posted: Mon Nov 22, 2004 4:52 pm
by Borage
I read that a typical cell phone generates an average RF power level of 0.6 W for an analog unit and less for a digital unit. The newer code division multiple access (CDMA) models have adaptive level control, so they send the minimum signal necessary to satisfy the base station.
For example, Nokia 3650 is rated for 1 watt of RF power and some other phones use Philips BGY122A and BGY122B 1.2-Watt UHF Amplifier. Both modules provide a minimum power gain of 27.8 dB, which means that only 2 mW of RF drive is required to deliver an output power of 1.2 W into a 50 ohm antenna load.
Here is a triband cell phone with 2 watt transmitter power.
http://www.hazardousareadirect.com/Prod ... ANDY04.htm