Doublet Center
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Two lightweight doublet centers: continuous-wire or removable terminals, with matching open-wire feedline spacers.
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Updated at source:
Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Center supports for portable doublets with open-wire feedline. Defaults target 1.02 mm insulated wire diameter and 12.7 mm (½ inch) feedline spacing.
Choose a version
Continuous wire: doublet_center_continuous_wire.stl, 60 × 38 × 4 mm. Each antenna leg continues into the feedline without a joint; only wire and suspension cord are needed.
Terminals: doublet_center_terminal.stl, 64 × 42 × 5 mm. Separate antenna and feedline wires meet on two studs; snap-open channels allow radiator changes.
Printing
Print flat at 100% scale without supports. Suggested: PETG, 0.20 mm layers, 0.4 mm nozzle, 4 walls, and at least 5 top/bottom layers.
Terminal hardware
Use stainless fasteners:
2 × #6-32 × 7/8 inch pan-head screws
4 × #6 flat washers, 3/8 inch OD
2 × #6-32 hex nuts and 2 × #6 internal-tooth lock washers
2 × #6-32 flanged thumb nuts, 3/8 inch head OD
4 × TE 31430 ring terminals, 26–22 AWG, #6 stud
4 × 3.2 mm, 3:1 adhesive-lined heat-shrink pieces
Wiring
See wiring_guide.svg for the routes.
Continuous: choose either face as front. Route each conductor outer-hole front-to-back, middle-hole back-to-front, lower-hole front-to-back, then downward into the feedline. Mirror the other side.
Terminals: nuts face front. Snap each radiator through the outer channel front-to-back, then inner channel back-to-front. Thread each feedline upward through its lower hole front-to-back, then upper hole back-to-front. Leave slack, crimp with suitable tooling, pull-test, and heat-shrink the barrels.
Stack each screw back-to-front: head, washer, plate, washer, hex nut, radiator ring, feedline ring, tooth washer, thumb nut. Both rings touch directly. Tighten the hex nuts; hand-tighten the thumb nuts.
Tug the wires to check the weaves take tension. Check continuity along each side and isolation between sides.
CAD renders shown; printed fit and wire retention need checking. Editable OpenSCAD sources included.
Companion: Doublet Feedline Spacers.
License: CC BY-NC-SA 4.0.
Source and documentation: scad-lab on GitHub.