Re: [WISPA] great FAQ on the difference between dB and dBi/dBm

[Rogelio]

Chuck McCown - 3 wrote:
> The article was good for our industry.   There are tons of absolute dB 
> readings like dBuV, dBrnc0 and dBspl.  I always explain it as simply a 
> logarithmic way of stating a measuring unit like power or force.  You 
> could have dBmpg (miles per gallon) if you wanted.  A naked dB by itself 
> is nothing more than a logarithmic multiplying factor.

What made this "difficult" for me a month or so ago when I got into RF, 
was not knowing the math behind the calculations.

e.g.

10 * log10(x milliwatts) = y dBm

When I show others how to do this, I note that just because dBm's are 
added to dB's, they are NOT the same. The log craziness is what we do so 
that we can later add together similar numbers.

e.g.

x dBm + y dB = z dBm



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Re: [WISPA] great FAQ on the difference between dB and dBi/dBm

[Jack Unger]

Yes. The page is VERY well written. It sounded almost word-for-word like 
the way I've been teaching this concept (along with many others) to the 
WISP industry since 2001.

Rogelio wrote:
> http://www.broadbandreports.com/faq/14091
>
> I hate to admit this, but I often get these mixed up (sort of like 
> centripetal and centrifugal force!)
>
>
> 
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-- 
Jack Unger - President, Ask-Wi.Com, Inc.
Serving the Broadband Wireless Industry Since 1993
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Re: [WISPA] great FAQ on the difference between dB and dBi/dBm

[Rogelio]

Chuck McCown - 3 wrote:
> The article was good for our industry.   There are tons of absolute dB 
> readings like dBuV, dBrnc0 and dBspl.  I always explain it as simply a 
> logarithmic way of stating a measuring unit like power or force.  You 
> could have dBmpg (miles per gallon) if you wanted.  A naked dB by itself 
> is nothing more than a logarithmic multiplying factor.

Yup, and if you understand that basic principle, then the law of 10's 
and 3's makes sense (10dB = 10x power; 3dB = 2x power).



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Re: [WISPA] great FAQ on the difference between dB and dBi/dBm

[Chuck McCown - 3]

The article was good for our industry.   There are tons of absolute dB 
readings like dBuV, dBrnc0 and dBspl.  I always explain it as simply a 
logarithmic way of stating a measuring unit like power or force.  You could 
have dBmpg (miles per gallon) if you wanted.  A naked dB by itself is 
nothing more than a logarithmic multiplying factor.

- Original Message - 
From: "Rogelio" <[EMAIL PROTECTED]>
To: "WISPA General List" 
Sent: Wednesday, July 16, 2008 8:45 AM
Subject: [WISPA] great FAQ on the difference between dB and dBi/dBm


> http://www.broadbandreports.com/faq/14091
>
> I hate to admit this, but I often get these mixed up (sort of like
> centripetal and centrifugal force!)
>
>
> 
> WISPA Wants You! Join today!
> http://signup.wispa.org/
> 
>
> WISPA Wireless List: wireless@wispa.org
>
> Subscribe/Unsubscribe:
> http://lists.wispa.org/mailman/listinfo/wireless
>
> Archives: http://lists.wispa.org/pipermail/wireless/
> 




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[WISPA] great FAQ on the difference between dB and dBi/dBm

[Rogelio]

http://www.broadbandreports.com/faq/14091

I hate to admit this, but I often get these mixed up (sort of like 
centripetal and centrifugal force!)



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