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[TowerTalk] COAX connector heating

To: <>
Subject: [TowerTalk] COAX connector heating
From: (Tom Rauch)
Date: Sat, 31 Mar 2001 05:11:55 -0500
Hi Stan,

> Tom Rauch wrote:
> >
> > As long as the switch doesn't fail from the heat, why worry?
> Isn't a lot of heat just wasted energy?  I can't see trying to
> squeeze every last db out of an antenna then lose a bunch of
> energy in a coax connector.  

We need to keep things in perspective. Even an insignificant 
amount of loss can cause a connector or switch to get so hot it 

"Getting warm" does not mean loss is high. We get a real feel for 
loss only by considering how warm the thing gets, the power and 
duty cycle, how big the object is, and how well it gets rid of heat.

I like to visualize how hot a light bulb would get if all that heat was 
in the same size box.

If we lost 20 watts of power in a switch or connector, it probably 
wouldn't last a few minutes on RTTY before failing. That would be 
0.1dB loss at 900 watts.
73, Tom W8JI 

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