> Nice stuff... but I don't like to use flexible feed lines that > depend a lot on air-conductor spacing/placement. Once you've had a > center conductor migration problem... you never trust that type of > wire again.
...which is why I haven't bought Cablewave air dielectric cable after experiencing burn-outs of 3 1/8" and 4 1/8" line used for FM broadcast due to center conductor migration at bends with radii several times greater than the minimum spec. Although this is probably "old news" to many, some reading on foil+braid cables, PIM, and other related matters can be found below. http://www.andrew.com/search/BN_SP30-27.aspx (The basics) http://www.timesmicrowave.com/content/pdf/lmr/171-181.pdf (Which talks about self-generated cable noise among many other things, but the mention of PIM is suspiciously absent) http://lib.tkk.fi/Diss/2005/isbn951227485X/isbn951227485X.pdf (Heavy-duty bathroom reading material) --- Jeff
