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[TowerTalk] COAX connector heating

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Subject: [TowerTalk] COAX connector heating
From: (Barry Kutner)
Date: Fri, 30 Mar 2001 10:40:39 -0500
I agree with Bill, W7TI.
When I am contesting on RTTY, full power, on 10m, my coax 
(RG213) gets a bit warm to the touch. We're not talking hot, or hot 
enough to melt the dielectric or jacket. Using larger coax is overkill, 
as it is within the coax's specs. It's like saying if your amplifier gets 
warm, you need a bigger amplifier!
Barry W2UP

On 30 Mar 01, at 15:31, Bill Hider wrote:

> If the coax is routinely getting warm due to the transmitted energy
> being applied to the coax, and the load (antenna) is properly matched,
> then it's the wrong size coax for the application.
> If your coax is getting warm under the conditions described below, you
> are losing power in the coax which could result in a fire safety
> hazard (not to mention lost QSOs).  I'd check the VSWR to be sure it's
> as *flat* (as close to 1:1) as possible. That will ensure any heat
> problem with the coax can be isolated to a component in the line
> (connector/switch/adapter/lightning arrestor, etc). If you still wish
> to operate this way, move up to higher power-handling coax, such as
> LDF-4, etc.
> Bill, N3RR
> ----- Original Message -----
> From: Bill Turner <>
> To: Bill Hider <>
> Cc: <>
> Sent: Friday, March 30, 2001 3:50 PM
> Subject: Re: [TowerTalk] COAX connector heating
> >
> > This statement is too broad.  At 1500 watts of RTTY on 10 meters,
> > any coax
> will
> > be slightly warm to the touch.
> >
> > 73, Bill W7TI
> >
> >

Barry Kutner, W2UP              Internet:
Newtown, PA         FRC         alternate:

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