March 2000 QST

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THE HELP DESKSchematic Symbols52 March 2000
By Wayne McFee, NB6MThe NB6M QRPPaddlesWhen you’re operating QRP in the field, the last thing you need is acumbersome key. These Lilliputian paddles will go anywhere!he best part about these tiny CW paddles is that you canTmake them yourself in just a couple of hours, start tofinish. They are made from readily available materials,and cost almost nothing to build.All you need are some scraps of double-sided PC board material,a piece of single-sided PC board material for the base (measuring1 7 /16 × 2 inches), two optional phono jacks, two short piecesof hookup wire, four 4-40 brass nuts, and two 4-40 × 1 /2-inch longsteel screws. One more 4-40 steel screw, one inch long, is used toposition the adjustment screw supports for soldering, and is thenput back in the junk box.The base could be made out of double-sided PC board, if youwant. The phono jacks are optional, because you could very welljust solder the wires of the connecting three wire cable directly tothe paddle set, which is what I did when I made my first one.Let’s Get StartedThe tools you will need for this project are: a hack saw (just theblade will do), a file for rounding and smoothing edges, a smallhand (or electric) drill and appropriate bits, and a low-wattagesoldering iron and solder. For enlarging the tension adjustmenthole in the paddle, you can use a tapered reamer (available fromRadioShack) or a small rat-tail file.Using the Figure 1 and the accompanying photographs as guides,first cut out and shape the five parts made from PC board material.It will be far easier to drill the holes for phono jacks in the rear frame,the initial hole for tension adjustment in the paddle, and the holes foradjustment screws before cutting the relatively small pieces fromthe board. First, outline their shapes in the material, drill the appropriateholes, and then cut the pieces from the board. Now use the fileto round corners and smooth the edges of the pieces.I soldered one 4-40 brass nut to one side of each of the adjustmentscrew supports, in order to provide the threads for the screwsto fit into. You could simply drill and tap (with a 4-40 tap availableat any hardware store) the PC board material and use just the locknuts. However, in the interest of strength and durability, I recommendsoldering a nut to each support.Note that the copper foil is cut in two places on each side of theFigure 1—Cuttingtemplates for the PCboard components ofthe paddles. You canphotocopy this page,cut out the patternsand tape them to thePC boards prior tocutting and shaping.March 2000 53
Page 6 and 7: March 2000 Volume 84 Number 3David
Page 11 and 12: THE AMERICAN RADIORELAY LEAGUE INC
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