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[Amps] AL-80B questions

To: <amps@contesting.com>
Subject: [Amps] AL-80B questions
From: 2 at vc.net (rlm)
Date: Tue Mar 11 13:03:02 2003

>Rich:
>       My statements about the RF resistance are results of simple 
>application of the "theory" of RF resistance as stated in Terman. I accept 
>it 
>as the authority, despite its age. If you want to dispute that, then let's go 
at it.

**  whatever gave you that idea, Eric ?  I own a copy of Terman, and I 
consider it the gospel of electronics.
>
>       According to that theory, which attempts to account for all of the 
>skin-effects, the RF resistance, where skin-effect dominated (i.e. large 
>enough conductors) is proportional to (sqrt)p at any frequency. In other 
>words, two different conductors, at a given F, will differ by (sqrt)p . I am 
>using 'p' for the normal symbol for resistivity, rho.
>
>Based upon a DC resistance ratio, which is directly proportional to rho, of 
>64 for Nichrome, this equates to a ratio of 8 for R(VHF). I am claiming no 
>more or less than this.
>
>       The value you sight, 

**  I did not see the measurement.

>5.5, is not actually that far off, so I don't 
>see any need to argue that. 

**  I will not.

>I am curious, however, where you got the number from.
>
**  Joe Funderburg's (W6IHA) Boonton Q meter.

>       On a second point, it is NOT true that all of the RF current passes 
>thru the suppressor. There is clearly a direct path through C(p-k) to 
>ground.  However, the relavence of this depends upon your assumed circuit 
model, 
>which is not at all clear to me. That is why I raised the question about it 
in the first place.
>
>       Those of you who have been so engrossed in this issue for so long, it 
>is probably clear what you intend. But for those of us who are just trying 
>to understand the comments and remarks that get posted, we could use, if it 
>exists, the generic model which you (and any others who contribute to the 
>overall signal level) assume 
>
>If  it is a relatively simple resonant circuit (less than 5 or 6 poles) then 
>there is really no argument. We can analyze it quite accurately by several 
>different methods, and that analysis will clearly show the effect of any 
>component contained in it. This includes any resistors which introduced as 
>lump sub-elements of other components.
>
>73
>Eric von Valtier K8LV

-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
end

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