GrabCAD 模型信息
Super-Duper J-Pole Vertical Omni-Directional Antenna for 2m Amateur Radio · 模型 266929
This is a model of a 'Super-Duper' J-Pole Vertical Omni-Directional Antenna for 2m Amateur Radio that i modeled after one that i saw here : http://vk6ysf.com/superjpole.htm The diagram shows a design for 435 MHz, however i have designed for a common 446 MHz common to the USA for 2 meter repeater communications. There are a lot of j-pole designs and this website tries to catalog many of them : https://www.dxzone.com/catalog/Antennas/J-Pole/ I decided to use #6 AWG copper wire, but the model is showing silver plated #6 AWG copper wire if you can find it. This is what is commonly available : https://www.lowes.com/pd/6-Gauge-Solid-Soft-Drawn-Copper-Bare-Wire-By-the-Foot/3136865 Instead of wrapping in tape and putting it in PVC tubing, i elected to put it in clear acrylic plastic with acrylic spacers. This provides a rain shield over the antenna and the matching network as well as the feed-point of the this antenna to keep it from being de-tuned by snow and ice during the winter months. The matching section is using a 300 ohm twin-lead balanced line into a custom BalUn out to a 50 ohm sealed N-type coaxial connector that i recommend using LMR-400 coaxial cable. For better signal recovery a 75 ohm low-loss coax (RG-11/U) can be used instead, however the BalUn output would need to be at 75 ohms impedance at the N-type connector (the N-type connector will also will need to be 75 ohms). This antenna is called super-duper since a super J-pole antenna typically has only one phasing stub at the top to narrow the outward beamwidth, wherein this one has two phasing stubs to narrow the outward beamwidth even more. https://en.wikipedia.org/wiki/J-pole_antenna#Variations Note that i have tried NOT to use magnetic (iron / steel) components where possible to avoid de-tuning the antenna and shifting the radiation pattern. As such i have used 9mm wide tie wraps that can support 175 lbs each : https://www.cabletiesplus.com/Products/18-Extra-Heavy-Duty-Cable-Ties-(175-lb)-Black-100Pkg__CP-18-175-B.aspx and I used some 3M VHB tape LSE-110WF : https://www.3m.com/3M/en_US/p/d/b5005036160/ to make sure that the tube doesn't slip down. The 2" mast to 4" tube support was designed to be 3D printed to get a full custom design to fit perfectly. There are (3) u-bolts which are preferred to be aluminum (non-magnetic) if possible. https://www.mcmaster.com/u-bolts/u-bolts-6/material~aluminum/center-to-center~2/
- 格式
- Rendering、STEP / IGES
- 分类
- Aerospace、Electrical、Military
- 标签
- lmrs、uhf、vhf、balun、pole、j-pole、radio、frequency、rf、antenna、wireless、khz、mhz、ghz、coax、coaxial、vertical、amateur、ham、scanner、short、wave、3d、printed、gmrs、frs、murs
- 数据更新
- 2026-10-31T16:06:15Z