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Re: [TowerTalk] Johnson Matchbox

To: Bill N1eY <>, Jim Brown <>
Subject: Re: [TowerTalk] Johnson Matchbox
From: Bill MacLane <>
Date: Mon, 24 Mar 2008 17:27:57 -0700 (PDT)
List-post: <">>
One was 275W and on 1000W. Both rated for AM. 

Bill N1eY <> wrote: Well,  aren't there two versions of the 
Johnson Matchbox?  One was lower 
power and the other was QRO.

Jim Brown wrote:
> On Sun, 23 Mar 2008 21:32:43 -0700, Tom Osborne wrote:
>> Ran 500 watts with the SB-200 and it didn't even get warm.  
> Dissipation depends on the voltage and current in individual 
> components, which in turn depends on the exact values of complex 
> impedances being transformed, the frequency, and, of course, the 
> power level. A capacitor that runs cool under one set of conditions 
> may go up in smoke under a different set. 
> Not to worry -- excessive dissipation is usually signalled by a 
> special alarm that seasoned hams know well -- you begin to smell 
> them getting warm! 
> 73,


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