Hi David: You asked about how to get the three turns on the BL-1 core. Three turns means that you see TWO loops of cable going down the outside to of the core on each side. (Remember, turns are *always* counted by the number of passes through the center of the core). For each hole, the wire starts at one end of the core, goes through the hole (that's turn 1), loops around the outside, back through the same hole (turn 2), around the outside the second (and last time) then goes back through the same hole (turn 3) one last time. Where it starts at one end you'll strip and solder to the terminals on the board near the coaxial input connector and where it ends at the opposite end you'll strip and solder the wires to the terminals at the output end of the BL1 board.
I have a hunch you're trying to see three loops of wire around the core on the outside: that's why it won't fit and there isn't enough wire. That would make four turns! You wanted to know if you were building the 1:1 or 4:1 version. The ONLY difference between them is how the windings are connected at the output end of the board. If you hook the red and white leads to the circuit board pads as shown on the board - white leads to white pads and red leads to red pads, you'll have a 4:1 balun. If you want a 1:1 balun, connect the two white leads together and connect them to the pad marked WHITE nearest the edge with a number 2 on the board, then connect the two red leads together and connect them to the pad marked RED at the edge with the number 1 on the board. The inner "white" and "red" pads are not used. That's the only difference between the 1:1 and 4:1 versions. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
