Doublet Feedline Spacers
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Snap-on spacers for lightweight open-wire feedline: 12.7 mm spacing, sized for thin insulated antenna wire.
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- Printables
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- Electronics
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
Small snap-on spacers for homemade open-wire feedline, also called ladder line. Fit them along two parallel antenna wires to maintain their separation. Use them with Doublet Center or another lightweight antenna.
Fit
Defaults target 1.02 mm insulated wire diameter with 12.7 mm (½ inch) conductor center spacing. Each spacer is approximately 17.5 × 3.8 × 2.4 mm, with 1.20 mm channels and 0.72 mm snap throats.
Measure the jacket diameter of your wire; AWG alone does not determine fit. Spacing is a mechanical dimension, not an exact impedance rating.
Printing
Print balanced_feedline_spacer.stl flat at 100% scale without supports. Suggested: PETG, 0.20 mm layers, 0.4 mm nozzle, 4 walls, 100% infill.
Try two or three spacers on your actual wire before printing a batch. Check that the jaws snap closed without shaving the insulation, then coil and uncoil the sample feedline to check retention.
Use
Snap each wire sideways through the opening at its end of the spacer. In use, the wires run perpendicular to the spacer's broad face. No screws, ties, or glue are needed.
Start about 50–75 mm below the center, then roughly every 200 mm (8 inches). Add spacers wherever the wires twist together.
Open balanced_feedline_spacer.scad in OpenSCAD to adjust wire diameter, channel clearance, snap throat, and spacing.
CAD renders shown; printed fit and wire retention need checking.
License: CC BY-NC-SA 4.0.
Source and documentation: scad-lab on GitHub.