BNC Dipole Center
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BNC dipole center in four versions: optional packing strap slots and an open toroid balun mount. 9.5 mm BNC fit.
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A BNC feedpoint for linked or ordinary dipoles, with four configurations from one OpenSCAD source.
Choose your center
All four STLs use the current 9.5 mm D-shaped BNC opening.
STL file | Toroid mount | Packing strap slots | Size (W × H × D) |
|---|---|---|---|
| No | No | 90 × 39 × 23 mm |
| No | Yes | 90 × 39 × 23 mm |
| Yes | No | 90 × 100 × 23 mm |
| Yes | Yes | 90 × 100 × 23 mm |
The compact version with straps is the same center supplied with the Nesting BNC Dipole Center and Winders. The taller balun versions have not been checked for packing with loaded nesting winders.
What the options do
Packing strap slots: two 14 × 3 mm openings accept roughly half-inch hook-and-loop strap up to 2 mm thick. For nesting winders, run a short strap around the back and fasten its ends at the slots. The front stays clear. Slots retain the 90 mm width and terminal-to-wire-hole spacing. The automatic hanging eye is 8 mm with slots, 6 mm without.
Balun mount: a taller spine supports a separately wound toroid. Ferrite, winding wire, pads and ties are separate parts. Four small 3.4 × 2.4 mm toroid tie slots come with this option, independently of the packing slots.
The mount reserves a Ø34 × 18 mm wound package. The prototype uses one Fair-Rite 2631801202 mix 31 core and 12 bifilar turns of 22 AWG enamelled copper. Follow the included winding and mounting guides. Physical and electrical qualification remains in progress; no RF power rating is established. Compact centers use a separate feedpoint choke; the original setup uses ABR Industries RG-316 and seven mix 31 beads.
Check the BNC fit first
The Amphenol RF 31-221-RFX drawing specifies a 9.70 mm cutout. 9.50 mm is the selected printed fit, after larger openings had play. Check your own connector and printer.
Print bnc_fit_coupon_tight.stl: 9.50, 9.55, 9.60, 9.65 and 9.70 mm. Keep its foot down and hole panels upright, matching the center’s 3 mm shelf. Use the same material and slicer settings at 100% scale. Choose the smallest opening that accepts the connector without force and seats the D-flat.
In dipole_center.scad, use bnc_clearance=(D-9.70)/2 for coupon diameter D. The default -0.10 gives 9.50 mm; circle and flat adjust together. Render (F6) and export a new STL after changing parameters. Do not scale the whole model to fit the connector.
Useful OpenSCAD controls
The source ZIP includes self-contained dipole_center.scad and build guides. Dimensions are millimeters.
Parameter | Default | Use |
|---|---|---|
|
| Add the taller spine and toroid tie slots |
|
| Add packing strap slots |
| -0.10 | BNC fit; gives a 9.50 mm opening |
| 14, 3 | Strap width and thickness clearance |
| 0 | Automatic 6/8 mm eye, or explicit 4–8 mm |
| 3.4, 3.2 | M3 and insulated-wire clearance |
| 34 | Wound toroid diameter; adjusts mount height |
The README documents balun lead-space controls and preview allowances. Keep strap-slot thickness at 3 mm with default wire holes; thicker slots need compatible smaller holes or chamfers.
Print and assemble
Print at 100% scale, backplate flat and BNC shelf upright. Starting settings: PETG, 0.20 mm layers, five walls, 100% infill. Supports are not intended; inspect the BNC flat’s short bridge.
Hardware: BNC jack and mounting hardware, two M3 × 16 mm screws as a starting length, four nuts, eight approximately 7 mm OD washers, and suitable ring terminals such as Panduit P22-6R-M. Check the screw stack and sample crimps. Balun builds also need the core, winding, pads and ties in the guide.
Dry-fit the connector, shell tag, fasteners and coax plug.
Weave each antenna wire before crimping its ring. From outermost hole inward: back-to-front, front-to-back, back-to-front. Leave slack to the terminal and pull-check the weave.
Connect BNC center to one terminal and shell to the other, through the documented winding circuit when fitted. Check continuity/isolation before connecting a radio. Support heavy coax separately.
CAD checks pass; printed strength and balun hardware fit remain unqualified.
Design by Robert Jackson, N1RWJ. Shared under CC BY-NC-SA 4.0.