Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeView the YouTube RF Cafe Intro VideoKirt Blattenberger ... single-handedly redefining what an engineering website should be.

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio
RF Cafe header

802.11b/g Tx Power - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Please visit the new and improved RF Cafe Forums that were created in September of 2015. Unlike with the old forums where users registered individually, the new forums use a common User Name and Password so anyone can post without needing to create an account. Please find the current User Name and Password on the RF Cafe homepage. Thanks for your participation.

Below are all of the old forum threads, including all the responses to the original posts.

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

 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

Newest Posts on RF Cafe Forums

as GUEST:  User=guest1 | Pwd=micro1

Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.