NetStumbler.org Forums

Go Back   NetStumbler.org Forums > Newbie Lounge
Reload this Page SNR, Signal & Noise
Register Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old 06-18-2004   #1 (permalink)
Przemek_d
Registered Member
 
Join Date: Jun 2004
Posts: 1
SNR, Signal & Noise
Hallo,
My first Question:
What is the difference between the export text and wi-scan. The exported files seems to be very similar.

Second(more important):
What kind of values are SNR, Sig and Noise? The exported text files shows e.g.:
[ SNR Sig Noise ]
[ 43 96 53 ]

I thought Sig and Noise are dBm values. But then they should be nagative.
if I add an - and interpret the values abouve as [ 43 -96 -53 ]
Why is the Sig value smaller than Noise?

thx
Przemek_d is offline   Reply With Quote
Old 06-18-2004   #2 (permalink)
Chris
Bad as Can
 
Chris's Avatar
 
Join Date: Jul 2002
Posts: 1,141
I can't flame in here...

http://forums.netstumbler.com/showthread.php?t=11301
__________________
perl -e 'print pack(c5, (41*2), sqrt(7056), (unpack(c,H)-2), oct(115), 10)'
Chris is offline   Reply With Quote
Old 11-29-2004   #3 (permalink)
mk175
Registered Member
 
Join Date: Nov 2004
Posts: 1
Quote:
Originally Posted by Chris
can't access this page ... a fault or forbidden?

martin
mk175 is offline   Reply With Quote
Old 11-29-2004   #4 (permalink)
Thorn
Did you do the math?
 
Thorn's Avatar
 
Join Date: Apr 2002
Location: Villa Straylight
Posts: 10,000
Quote:
Originally Posted by Przemek_d
Hallo,
My first Question:
What is the difference between the export text and wi-scan. The exported files seems to be very similar.

Second(more important):
What kind of values are SNR, Sig and Noise? The exported text files shows e.g.:
[ SNR Sig Noise ]
[ 43 96 53 ]

I thought Sig and Noise are dBm values. But then they should be nagative.
if I add an - and interpret the values abouve as [ 43 -96 -53 ]
Why is the Sig value smaller than Noise?

thx
1) They are similar, but are slightly different. The differences are retained for legacy purposes with other programs.

2) The values are dBm... sort of. Due to the way that the original ORiNOCO drivers worked, you need to subtract 149.

Thus [ 43 96 53 ] becomes [ -106 -53 -96 ].

For further information, please read the FAQs and search on "149".


Quote:
Originally Posted by mk175
can't access this page ... a fault or forbidden?

martin
Forbidden. Przemek_d made a crosspost. Crossposts are against the Rules, and it has been removed.
__________________
Thorn
Sex and Violence. You can't enjoy one, if you don't survive the other. (And that works both ways...)
Thorn is offline   Reply With Quote
Old 04-21-2005   #5 (permalink)
adonis
 
Posts: n/a
I searched for 149 in the FAQ and did not find any result at all.
  Reply With Quote
Old 04-21-2005   #6 (permalink)
wrzwaldo
I amuse you?
 
Join Date: Dec 2003
Posts: 9,124
Quote:
Originally Posted by adonis
I searched for 149 in the FAQ and did not find any result at all.
Search ALL...

"149"

Showing results 1 to 18 of 18
Search took 0.03 seconds.
wrzwaldo is offline   Reply With Quote
Old 04-21-2005   #7 (permalink)
Thorn
Did you do the math?
 
Thorn's Avatar
 
Join Date: Apr 2002
Location: Villa Straylight
Posts: 10,000
As pointed out by adonis in this thread: Magic Number? there is a mistake in what I'd orginall posted above. Subtract 149 from the only Signal and the Noise, not the SNR. The SNR figure will be accurate whether or not the Signal and Noise figures are converted to dB.

So the above example should be:

[ 43 96 53 ] becomes [ -106 -53 53 ].
__________________
Thorn
Sex and Violence. You can't enjoy one, if you don't survive the other. (And that works both ways...)
Thorn is offline   Reply With Quote
Old 04-22-2005   #8 (permalink)
adonis
 
Posts: n/a
[43 -53 -96] you mean. Thank you.
  Reply With Quote
Reply

« Magic Number? | Book Sugestions »

Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Google
 
Web NetStumbler.org

All times are GMT -7. The time now is 08:43 PM.

Contact Us - NetStumbler.org - NetStumbler.com - Online Backup - Archive - Top

Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.0.0 ©2007, Crawlability, Inc.


All messages express the views of the author and are for entertainment purposes only. Netstumbler.org cannot be held responsible for the authenticity of the content or the actions of its members. By using this site and its services, you warrant that you will not post any messages that are discriminating, obscene, hateful, threatening, or otherwise violates any laws and you release Netstumbler.org from any future claims of any kind whatsoever including, but not limited to, addiction and loss of productivity. All forum messages, private messages and any other content are properties of Netstumbler.org. Even if publicly available, personal or copyrighted information are not to be posted without the consent of the owner. Distribution of licensed and copyrighted materials in any way not endorsed by the copyright owner is strictly prohibited. You may not use this site and its resources to spam other sites or individuals or perform any action that violates any law. Items sold or bought in the For Sale forum are sold as is and no warranty or insurance of any kind is provided. Netstumbler.org cannot be held responsible for the outcome of any transactions and no warranty of any kind is provided, either express or implied. Vulgar words are not allowed in the subject lines ; they may be used in the message body in any forum. The Administrator, Super Moderators and Moderators of Netstumbler.org have the right to remove, edit, move or close any thread for any reason and to reveal your identity and other known information in the event of a complaint or legal action arising from any message posted by you.