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802.11b/g Tx Power - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

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 Post subject: 802.11b/g Tx Power
Posted: Thu Aug 23, 2007 4:56 pm 

Joined: Thu Aug 23, 2007 4:27 pm
Posts: 2
Location: Wichita KS
I was of the understanding that a wireless b/g card will initially transmit at full power (100mW) when initiating a link with an access point and then back off stepwise to the minimum power required for the link. I.e., if the signal was good and clean between AP and card, both parties would sense this and step down their Tx power to something quite a bit lower than 100mW.

I've done some searching, but I can't find anything explaining such a physical layer mechanism for b/g.

Am I mistaken?

Thanks in advance.

 Post subject:
Posted: Mon Sep 10, 2007 8:52 am 
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 304
Location: London UK
The lowest level I have seen reference to is 1 mW
However, I know not what the other steps might be.
A wild guess: 10dB

 Post subject:
Posted: Mon Sep 10, 2007 9:07 am 

Joined: Thu Aug 23, 2007 4:27 pm
Posts: 2
Location: Wichita KS
Thanks for your help. It seems that there is no tx power control in b/g other than what is set by the user through the device driver.

 Post subject:
Posted: Sat Sep 27, 2008 2:30 pm 

Joined: Sat Sep 27, 2008 2:07 pm
Posts: 1
The 802.11 spec has many chapters. Some deal with TX power control mechanisms. If I recall correctly the 11k or 11h have what you look for.

Posted  11/12/2012