RG8X jumpers warm slightly at 1500W on 10 meters due to the
small but finite loss. The heating is distributed roughly uniformly
(depending on VSWR) along the length of the coax, so it should
not be a fire hazard (else you better disconnect you amplifier, exciter,
power supply, etc).
Mike, W4EF..........
----- Original Message -----
From: "Bill Hider" <n3rr@erols.com>
To: <w7ti@jps.net>
Cc: <towertalk@contesting.com>
Sent: Friday, March 30, 2001 6:31 AM
Subject: Re: [TowerTalk] COAX connector heating
> 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 <w7ti@jps.net>
> To: Bill Hider <n3rr@erols.com>
> Cc: <towertalk@contesting.com>
> 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
> >
> >
>
>
|