I've seen the same thing with 3 5/8" or whatever that size is. I figure it was high SWR combined with something else, but it actually burned it about 40' up the tower as the 'technician' was tuning the transmitter. We later climbed up, cut it off above the bad spot, installed a coupling (monster piece of hardware) and replaced the feedline from there down into the building. It was pressured with dry air.
It was an interesting site to watch...I was beginning to ponder how we were going to put the damn fire out when the plastic jacket melted enough to drip off the heliax and things calmed down (when the RF was taken away). 73 N7HQR > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Joe > Sent: Saturday, December 31, 2005 11:39 AM > To: [email protected] > Subject: Re: [Repeater-Builder] Bad 4" Heliax (Was Polyphaser Help) > > Yes > > At 09:30 AM 12/31/2005 -0800, you wrote: > >Joe, was it pressurized? > > > >Dick > > > >----- Original Message ----- > >From: <[EMAIL PROTECTED]> > >To: <[email protected]> > >Cc: "Eric Lemmon" <[EMAIL PROTECTED]> > >Sent: 31 December, 2005 09:26 > >Subject: RE: [Repeater-Builder] Bad 4" Heliax (Was Polyphaser Help) > > > > > >I've seen 6" hardline go bad at an FM broadcast site. Brand new > feedline, > >defective or contaminated insulators between the center conductor and the > >outer conductor. Total meltdown occured inside the feedline. > > > >Joe > > > > > > > > > Yahoo! Groups Links > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
