Point taken Ian, grey cells in reverse gear here :-) 73, Geoff GM4ESD
On July 09, 2011 at 19:17Z, Ian White GM3SEK wrote: > No - HF fields cannot propagate inside an open tube because it behaves > as like a 'waveguide beyond cutoff'. Any HF EM field injected into the > open end will only penetrate a very short distance inside before it > decays away. > > Coax is different because it contains *two* conductors: the inner skin > of the tube and the outer skin of the centre conductor. The internal > field is created between these two conductors and is thus able to > propagate down the line. > > So the answer to the OP's question is that tubing will only give him the > benefit of the larger outside skin. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
