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 <[email protected]> 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:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
