40 m Vertical Antenna Loading Coil for 5 m (17 ft) Whip
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Run your 5 m telescopic whip on 40 m with this base-loading coil.
- Ocena
- 4,75 / 5
- Polubienia
- 75
- Pobrania
- 424
- Wydruki
- 5
- Wyświetlenia
- 3547
- Oceny
- 4
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Other Gadgets
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
Note: these build instructions are preliminary - I'll try to update them with more detail when I have time, but I wanted to get these out there.
BACKGROUND:
5 m telescopic whip antennas have become readily available and very popular lately. I wanted a loading coil for mine to operate 40 m with it as well. So, I designed one.
BILL OF MATERIALS:
Some links are Amazon affiliate links which gives me a small kick-back when you order through them, but costs you nothing more.
| Mandatory Items | Qty | Source |
| 3d Printed 17T Coil | 1 | Print it using the attached STL. |
| 3d Printed Load Top | 1 | Print it using the attached STL. |
| 3d Printed Load Base | 1 | Choose the M10 bolt version if you plan to use the stock base and coax connector, or print up the BNC version. |
| Telescopic Whip | 1 | https://amzn.to/47F9WbQ |
| M3 Countersunk Screws | 8 | https://amzn.to/3RSrGak |
| M10 Flange Nut | 1 | https://amzn.to/4innQB4 |
| 18 ga wire | 25 ft | Just about any wire will do in 24 - 16 ga. Use what you've got. Or use this: https://amzn.to/3RjSqQT |
| BNC Chassis Mount Connector | 1 | If you're using the BNC base. https://amzn.to/3RjSqQT |
| M10 x 25 mm bolt | ~70 g | If you're using the M10 base. https://amzn.to/4j6tOaw |
| 3.5mm Banana Plug | 4 | Optional - 3 for BNC base, and 1 if building with jumper. https://amzn.to/4jxNx2L |
| Insulated flexible wire | 4 in | Optional - for bypass jumper. |
| Velcro Strap | 2 | Optional - for BNC base to strap to a ground spike. https://amzn.to/4lyVkz1 |
| Other Stuff | ||
| Solder | 6" | https://amzn.to/3PQr5Fa Kester is the good stuff. I like the 63/37 mix the best. Yeah, it costs more, but it's worth it. |
| Soldering Iron | 1 | https://www.digikey.com/en/products/detail/american-hakko-products-inc/FX888DX-010BY/24390014 Hakko is my preferred option. High quality, simple, and reliable. |
TOOLS:
- 3d Printer capable of printing PETG
- Soldering iron https://www.digikey.com/en/products/detail/american-hakko-products-inc/FX888DX-010BY/24390014 Hakko is my preferred option. High quality, simple, and reliable.
- Wire cutters.
ASSEMBLY:
1.) Print all the things.
2.) Assemble and secure the Top.
Solder a short ~1 inch piece of flexible wire to a 3.5mm female banana plug. Insert the wire into the jumper hole from the outside in, and heat set the banana plug into place. Ensure the wire will make contact with the flange nut when the top is screwed to the coil form by clamping the wire between the nut and the coil for good electrical contact.
Place the M10 flange nut in the top print. Secure the top onto the loading coil with the M3 screws clamping the end of the solid wire that will be used to wind the coil to make a solid electrical and mechanical joint.
2.) Assemble the base.
If you're using the BNC base, heat-set the female banana plugs into the ground lug holes and install the BNC connector. Solder jumper wires from the BNC ground lug to the 3.5 mm banana plugs you previously heat-set into place.
If you are using the M10 base, screw the M10 screw into the base so the threaded end extends out the side of the base with the countersunk M3 holes.
3.) Wind the loading coil.
Wind the wire around the loading coil. 16 turns seems to be around right for most builds. You can always remove turns if you have too many, but if you cut the wire too short, you will have to re-wind it. Bend the wire so it stays in place on the coil, but note that you may need to hold it in place until fully secured.
4.) Secure the base.
If you are using the BNC base, solder the end of the coil wire and the end of a 6" piece of insulated flexible jumper wire to the BNC center pin.
If you are using the M10 base, clamp the end of the coil wire and the jumper wire under the M10 bolt head to make strong mechanical and electrical contact.
Secure the base to the coil with the M3 screws.
5.) Prep the jumper.
Solder a male 3.5 mm banana plug onto the end of the jumper wire. To bypass the loading coil, simply plug in the jumper to the female 3.5 mm female banana plug
Set the system up and operate!
Have fun, and please post your best contacts with this antenna in some build comments.
Thanks, and 73.