Wi-Fi Is It Damaging Childrens Health - Page 2

Feek · 22-05-2007, 11:25

Quote:

Originally Posted by Le Hoff

It's just another source of RF... which in turn is another source of interference, which in turn is just more radiation permeating through our bodies... However GSM vs WiFi even with a high gain antenna omni directional antenna, will not be at the same level of a several dBW GSM mast - the mast next to my office is transmitting at 28dBW = just over 600W (630W)... Not really comparable

Oh, I have to chuckle at that - Not any of the comments but the dBW. I hate dBW with a passion and it annoyed me when all the official quoted figures changed from Watts to dBW a few years ago. I'm allowed to run 400 Watts from home (26dBW).

People still think in Watts, not dee bee doubleya!

/edit - The thing is that aerial gain is also incredibly important, it's not the transmitter output that's so relevant, but the ERP.

Will · 22-05-2007, 11:34

Sorry Feeky poos

I was taught it at uni and at school and it's kinda stuck

I agree, I tend to use Watts, but tend to fall into dBW without really thinking... feel free to castigate me suitably! (I enjoy it when you do it anyway).

Agreed about antenna gain and effective radiated power, it's a function of the gain and the tx power isn't it? So it ends up being a BIIIG number. High gain antennas used in wifi are usually more likely directional no?

Mark · 22-05-2007, 11:42

Not necessarily. I have a 9dB omni which I was using when trying to get wi-fi working across the house. Since I gave up that I've dropped back to a 5dB omni. In both cases the antenna was two feet from my head.

Will · 22-05-2007, 12:03

I was talking about BIIIIIIG gains, like 30dB +

Feek · 22-05-2007, 12:17

And the figures you quote, Mark will be theoretical, another pet hate of mine, the dBi/dBd farce.

Will · 22-05-2007, 12:21

You loooove the old school don't you Feek?

semi-pro waster · 22-05-2007, 12:21

I'm not totally sure of the purpose of wireless for most schools since every one I know already has wired LANs installed which makes it a bit redundant since most kids don't need a laptop (well I didn't when I was at school anyway). Plus wireless seems to hate me, I almost never get a decent stable signal.

As for the wireless being more dangerous than cellular - I'm far from an expert but I didn't think wireless used as much power or was capable of providing as much power as cellular anyway which seems to have been confirmed in the posts above anyway. If one is unsafe then surely both are?

Feek · 22-05-2007, 12:40

Quote:

Originally Posted by Le Hoff

You loooove the old school don't you Feek?

Not as such, but what I hate is the deliberate quoting of dBi instead of dBd to make a product look better when dBi is the gain over an isotropic in open space and is an impossible to reach figure.

Anyway, I'm off to warm up the vacuum tubes to get the light programme on the wireless. If that doesn't work then I'll listen to the gramophone instead

Will · 22-05-2007, 12:45

I love theoretical values - they make everything look so much better! You're obviously setting up your wireless wrong if you don't get isotropic propagation

Feek · 22-05-2007, 13:21

Very interesting article by Guy Kewney about this on El Reg. I like Kewney, he's been around for a long time and I've found he knows his stuff. Plus I was faster around the Silverstone stage of the RAC Rally circuit a few years ago than he was on a Packard Bell press day!

22-05-2007, 11:34	#12
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	Sorry Feeky poos I was taught it at uni and at school and it's kinda stuck I agree, I tend to use Watts, but tend to fall into dBW without really thinking... feel free to castigate me suitably! (I enjoy it when you do it anyway). Agreed about antenna gain and effective radiated power, it's a function of the gain and the tx power isn't it? So it ends up being a BIIIG number. High gain antennas used in wifi are usually more likely directional no? __________________ *No No!*

22-05-2007, 12:03	#14
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	I was talking about BIIIIIIG gains, like 30dB + __________________ *No No!*

22-05-2007, 12:17	#15
Feek ex SAS Join Date: Jun 2006 Location: JO01ou Posts: 10,062	And the figures you quote, Mark will be theoretical, another pet hate of mine, the dBi/dBd farce. __________________

22-05-2007, 12:21	#16
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	You loooove the old school don't you Feek? __________________ *No No!*

22-05-2007, 12:21	#17
semi-pro waster Provider of sensible advice about homosexuals Join Date: Oct 2006 Location: London Posts: 2,615	I'm not totally sure of the purpose of wireless for most schools since every one I know already has wired LANs installed which makes it a bit redundant since most kids don't need a laptop (well I didn't when I was at school anyway). Plus wireless seems to hate me, I almost never get a decent stable signal. As for the wireless being more dangerous than cellular - I'm far from an expert but I didn't think wireless used as much power or was capable of providing as much power as cellular anyway which seems to have been confirmed in the posts above anyway. If one is unsafe then surely both are? __________________ "Your friend is the man that knows all about you, and still likes you." - Elbert Hubbard

22-05-2007, 11:42	#13
Mark Screaming Orgasm Join Date: Jul 2006 Location: Newbury Posts: 15,194	Not necessarily. I have a 9dB omni which I was using when trying to get wi-fi working across the house. Since I gave up that I've dropped back to a 5dB omni. In both cases the antenna was two feet from my head.

22-05-2007, 12:45	#19
Will BBx woz 'ere :P Join Date: Jan 1970 Posts: 2,147,487,208	I love theoretical values - they make everything look so much better! You're obviously setting up your wireless wrong if you don't get isotropic propagation __________________ *No No!*

22-05-2007, 13:21	#20
Feek ex SAS Join Date: Jun 2006 Location: JO01ou Posts: 10,062	Very interesting article by Guy Kewney about this on El Reg. I like Kewney, he's been around for a long time and I've found he knows his stuff. Plus I was faster around the Silverstone stage of the RAC Rally circuit a few years ago than he was on a Packard Bell press day! __________________