describes how the principles of the DBJ-1 can be extended to a portable roll-up antenna. Since it is the second version of this antenna, it will be referred to as the DBJ-2. Principles of the DBJ-1
DBJ-2 Dual Band Roll-Up Antenna - Miklor
The DBJ-2 package includes the pre tuned antenna, ready to unroll and install. The package includes: - Roll-Up J-Pole, terminated with a BNC-M connector. - 6 foot RG58 jumper, with …
The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for ARES Edison Fong, WB6IQN WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes …
The DBJ-2 : A Portable VHF-UHF Roll-Up J-pole Antenna for ARES
The most common request from users is for a portable “roll-up” version of this antenna for backpacking or emergency use. To address this request, I will describe how the principles of …
The DBJ-2: A Portable VHF-UHF Roll-Up J-Pole Antenna For ARES
This document describes the design and operation of a portable dual-band J-pole antenna called the DBJ-2. It summarizes: 1) The DBJ-2 builds upon an earlier dual-band J-pole design (DBJ …
Reviews For: DBJ-2 Roll-up J-Pole - eHam.net
The DBJ-2 roll-up dual band J-pole antenna is just what I was looking for to use in my “go bag”. Dr. Fong and his students individually build, tune and test each antenna before shipment.
哈罗CQ火腿社区 - 天线和铁塔 - DBJ-2 U/V 双段便携 J型天线
2025年3月25日 · 设计思想是一段1/4波长的同轴，作为U段开路阻隔， 但对V段导通。 具体资料看下面。 调整注意顺序，首先调整U段，两个地方，一个是U段振子，调整到频点，另外一个 …
DBJ-2 - CasperARC
Bands: 2 m and 70 cm; Maximum input power: 50 W; Impedance: 50 Ohm; Gain: 2.1 dBi; SWR: less than 1.7:1 for VHF and less than 1.5:1 for UHF; Primary source: …
可卷曲便携式UV双段J型天线:DBJ-2 - 百度学术
百度学术集成海量学术资源，融合人工智能、深度学习、大数据分析等技术，为科研工作者提供全面快捷的学术服务。 在这里我们保持学习的态度，不忘初心，砥砺前行。
Ed Fong DBJ-2 Review - K0TFU
2024年7月6日 · Ed’s DBJ-2 is a portable VHF-UHF roll-up J-pole antenna constructed out of 300 Ω twin lead. It’s very flexible and can easily roll up into a 6 inch coil. When extended, it’s 92 …