Well, I'm not BUYING any Canare cable... just re-purposing 1/3 of a component cable I made a long time ago (and haven't needed in a decade), OR using some leftover Star Quad (if I can find it). I happen to have 50 NEW, unused Canare RCA connectors in the size required for L5-CFB cable (think slightly bigger than 1/4", but 75 Ohm). I realize broadcast quality cable is overkill... simply trying to not buy new stuff right now if I don't need to... but don't want to "get by for now" and let a potential RFI candidate into the system.
The REAL question is should I worry about an isolated chassis to chassis shield, or simply use a flexible coax, or a nice and flexible twisted-pair mic cable without a separate shield? ______________________ Clay Autery, KG5LKV MONTAC Enterprises (318) 518-1389 On 3/12/2016 3:58 PM, GRANT YOUNGMAN wrote: > I’ve never had any problem with RFI on my footswitch, running legal > limit from not all that far away. Any old shielded cable ought to do > just fine — think Radio Shack quality junk. > > Certainly no need for Canare in this application. > > > Grant NQ5T > K3 #2091, KX3 #8342 > > > > >> On Mar 12, 2016, at 3:46 PM, Clay Autery <caut...@montac.com >> <mailto:caut...@montac.com>> wrote: >> >> Hooking up a Linemaster Clipper Model No. 632-S to my K3s rear PTT >> RCA jack. >> >> Obviously, the RCA is 2-conductor unbalanced and there is no issue about >> which terminals to use on the foot switch for normally open switching. >> >> BUT, I want to make sure the foot switch cable is never an issue for RFI >> in or out. >> >> Options: >> >> 1) Use one-third of the Component cable assembly I built a long time ago >> with nice Canare RCA connectors and L5-CFB coax. (simply cut of one >> connector and connect the center conductor to the NO terminal and the >> braid to the C terminal) for a quick and free solution. Kind of stiff >> with solid center conductor. >> >> 2) Use unshielded twisted-pair 2-conductor (or shielded leaving shield >> disconnected) cable. (Have to buy a an RCA connector.) >> >> 3) Use shielded 2-4 conductor mic cable (nice and flexible). I think I >> have some Canare Star Quad around somewhere (Still have to buy the RCA >> connector). >> >> My question is: >> >> *Do I need to worry about shielding this cable?* I've got a ground to >> pick up the shield in the foot switch, but no place to pick up a chassis >> ground cleanly in the back of the K3s... I could terminate the shield >> to the RCA housing at the radio end, but that's going to the connector >> board... >> >> Alternatively, I could pull the shield out of the cable near the RCA >> cable plug at sufficient length to pick up the chassis ground screw on >> the back of the chassis with a ring terminal (not clean, have to buy RCA >> connector and MAYBE the cable if I can't find my spare Canare Star Quad >> mic cable). >> >> I'm going to use the re-purposed component cable described above for >> now, but I don't really want to EVER have to worry about this control >> cable giving me issues. I know it's a small thing, but if I cover all >> the small things as I go along, it'll be less work to isolate problems >> if/when they crop up down the line. >> >> Jim? >> >> Thanks a bunch! >> >> -- >> ______________________ >> Clay Autery, KG5LKV >> (318) 518-1389 >> >> ______________________________________________________________ >> 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 n...@tx.rr.com <mailto:n...@tx.rr.com> > ______________________________________________________________ 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
