[TowerTalk] Fwd: Dbi vs DBd

[Bill Aycock]

Bob-- In the design process, it does not matter, so long as the designer 
understands and uses a consistent set of methods and units. Only the 
designer must be satisfied.
However, when you leave the design process and try to tell another about the 
results, the rules become different. Communication of the results must be 
such that the meanings are the same for the "teller" and the "Hearer".
I clipped the post that was in yours to the most meaningful paragraphs.
Good luck--Bill--W4BSG

----- Original Message ----- 
From: "AD5VJ Bob" <rtnmi at sbcglobal.net>
To: "'Roger (K8RI)'" <K8RI-on-TowerTalk at tm.net>; "'Tower Talk'" 
<towertalk at contesting.com>
Sent: Tuesday, November 03, 2009 8:44 PM
Subject: Re: [TowerTalk] Fwd: Dbi vs DBd


> What about antenna design applications, do they give you a choice or one 
> or the other as a standard?
>
> Bob AD5VJ
>
>> -----Original Message-----
>> From: towertalk-bounces at contesting.com
>> [mailto:towertalk-bounces at contesting.com] On Behalf Of Roger (K8RI)
>> Sent: Tuesday, November 03, 2009 7:36 PM
>> To: Tower Talk
>> Subject: Re: [TowerTalk] Fwd: Dbi vs DBd
>>
>> Nearly all of my engineering textbooks used dbi, but in the
>> end, it makes not a bit of difference whether you use dbi or
>> dbd in the practical world *IF* you know which is bing used
>> AND you stick with the same units.
>>
>> db is a *ratio* whether it's db, dbi, or dbd.  Some have a
>> problem when the reference is different, but as long as the
>> person reading or doing knows the difference it doesn't
>> matter which reference is used.
>>