Brian, Tie the signal returns (ground) for for the K2 to other Elecraft gear to pin 1. Note that pin 5 is only the signal return (ground) in the RS-232 (PC) portion of the cable (K2 and PC ends)
For the W1 to PC cable, the signal return is pin 5, just as in the K2 to PC case. I have not looked at the SignaLink schematics (they are not convenient and on-line), so you are on your own there. I thought the SignaLink to PC connection was USB in any case. Certainly the audio cables can be made from twisted pair - it does not have to be shielded in most cases, the twist does most of the extraneous signal rejection. 73, Don W3FPR On 9/19/2011 5:12 PM, Brian - N5BCN wrote: > Hi All, > > I've taken Jim Brown and Don's advise and constructed a K2 to PC control > cable using Shielded Cat 6 ethernet cable. The shield is tied to the DB9 > shell on both ends of the cable, signal returns using the "striped wire" of > each pair tied to pin 5. > > The cable appears to be a success: RFI problems are much improved! > > Now I'd like to construct similar control cables for other gear in the > shack: > 1) The cable from the K2 to a remoted KPA100 > 2) The cable from the W1 to the PC > 3) Cable from a SignaLink to the PC and K2 > 4) etc > > Many of the above cables do not seem to have a "return" line and/or do not > use Pin 5. Assuming I'm still tying the shield to the DB9 shell, where > should I tie the "striped wires" of each pair to? > > ______________________________________________________________ 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
