An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage loops and high current flows at the current loops requiring a very heavy-duty transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the very least, a very heavy Teflon insulated line. In practice, it is usually the voltage breakdown that kills coax.
Of course high SWR also means high losses between the amp and the antenna. The power ratings published by coax cable suppliers are based on a low SWR -- typically less than 1.5:1. The bottom line is that going QRO means a more careful design and installation of the entire antenna system. 73, Ron AC7AC -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian Sent: Tuesday, March 28, 2017 4:31 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Amplifier thoughts KAT500 handles a much wider SWR range (like to about 10:1). Why do you assume people are lucky enough to have antennas with no more than a 3:1 SWR across the ham bands? Yes, higher SWR's require beefed up components but welcome to the real world. 73 de Brian/K3KO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
