Steve, A 1:1 balun is really a choke/isolator or some other names. If you are not going to use outdoors in wet weather. I wouldn't worry about doing anything elaborate. I would just wind as many turns of the LMR-100 as you can on the torroid. Put a female connector on one side and prepare the other side for ladder line.
If you hadn't already purchased the core, I would have recommended just winding about 10-12 turns of your coax on a piece of PVC pipe, at least 10X the diameter of the coax and long enough to conveniently hold the turns. I use this regularly as it is cheap and it works. If you need an impedance transformation, you will need to be a little more serious. 73, Barry K3NDM ----- Original Message ----- From: "Steve KC8QVO" <kc8...@yahoo.com> To: elecraft@mailman.qth.net Sent: Wednesday, July 18, 2012 7:13:54 PM Subject: [Elecraft] KX3 - 1:1 balun I have a few Amidon T80-2 toroids and plan on making a 1:1 balun. I guess I really have 2 questions. 1. Would insulated wire work OK to wind it with or is it really necessary to use enamel coated magnet wire? I have some #28 or so (cuttings from computer ribbon wire) that may work out well (already bonded through the length of it, dual conductor parallel runs). If not I have some 18 gauge gold color magnet wire. 2. I am going to use a BNC connector for the rig side. I am thinking of putting a pigtail of LMR-100 (maybe 4-6") to the connector, but if it is going to be too lossy or cause the impedances to be too far out of whack I won't worry about it and make the balun a direct box off the side of the rig. My last question is if there are any good triple ratio balun designs. I want the 1:1 to match doublets, but a 2:1 and 4:1 ratio would allow a bit more flexibility in impedances. Steve, KC8QVO -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-1-1-balun-tp7559405.html Sent from the Elecraft mailing list archive at Nabble.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 ______________________________________________________________ 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
