Ed, Double-shielded coax would most likely not make much if any difference to the level of birdies if the coax cables pass over or are close to an unshielded pcb, or some other unshielded source involved in generating a birdie. If moving the coax cables affects the level of birdies, then the outers of one or more cables would appear to be one path involved in the generation of birdies, and using double-shielded coax would only move this path to the outside of the second (added) braid of the coax.
Not an "exact science" but there are some fundamental rules. 73, Geoff GM4ESD ----- Original Message ----- From: "Edward R. Cole" <[email protected]> To: <[email protected]> Sent: Wednesday, September 08, 2010 7:35 PM Subject: [Elecraft] [K3] birdies and cable routing? > John, > > As Wayne has stated, routing varies with individual radios, so what > works for one may not be optimum for others (definitely a trial and > error process). A though occured to me, though. Since cable layout > seems to make a difference for some, I wonder if double-shielded > cables would make any difference? That would only if leakage is > occuring. If birdies are being conducted over the coax shields > (common-mode) then perhaps a few ferrite beads would help? > > This stuff is in the area of "magic touch" and hard to reproduce as > "exact science". > > 73, Ed - KL7UW ______________________________________________________________ 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
