DBJ-2: Difference between revisions

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(Provides resources for DBJ-2 antennas, which will be discussed and built during an activity meeting)
 
(Remove links to purchases and add notes from meeting)
 
(One intermediate revision by the same user not shown)
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Specs (from [https://edsantennas.weebly.com https://edsantennas.weebly.com] and [https://kbcubed.com https://kbcubed.com] :
Specs (from [https://edsantennas.weebly.com https://edsantennas.weebly.com] and [https://kbcubed.com https://kbcubed.com]:
* Bands: 2 m and 70 cm
* Bands: 2 m and 70 cm
* Maximum input power: 50 W
* Maximum input power: 50 W
Line 5: Line 5:
* Gain: 2.1 dBi
* Gain: 2.1 dBi
* SWR: less than 1.7:1 for VHF and less than 1.5:1 for UHF
* SWR: less than 1.7:1 for VHF and less than 1.5:1 for UHF


Primary source:
Primary source:
* [https://edsantennas.weebly.com/ https://edsantennas.weebly.com]
* [https://edsantennas.weebly.com/ https://edsantennas.weebly.com]


Links to buy antennas:
* [https://grapevineamateurradio.com/collections/radio-gear/products/ed-fong-j-pole-antennas-dual-band-220-and-roll-up Ham Radio 2.0]
* [https://www.kbcubed.com/DBJ-2H-2m-70cm-Dual-Band-Antenna-by-Ed-Fong-p406009746 KB Cubed, LLC]


Videos:
Videos:
* [https://www.youtube.com/watch?v=GRJw3SCBGfA How does a J-pole antenna work? AD#36]
* [https://www.youtube.com/watch?v=oZD55UvC7mY&t=169s How to build a J-pole with twinlead: Ask Dave #42]
* [https://www.youtube.com/watch?v=dDNGrL4gBEc Ham Radio Antenna - DBJ-2 Dual Band J-Pole Antenna (HT Antenna)]
* [https://www.youtube.com/watch?v=dDNGrL4gBEc Ham Radio Antenna - DBJ-2 Dual Band J-Pole Antenna (HT Antenna)]
* [https://www.youtube.com/watch?v=sFleoCVESdA DBJ-2, Ed Fong, Dual Band Portable HAM Roll Up Antenna - QUICK LOOK : Eye-On-Stuff]
* [https://www.youtube.com/watch?v=sFleoCVESdA DBJ-2, Ed Fong, Dual Band Portable HAM Roll Up Antenna - QUICK LOOK : Eye-On-Stuff]
* [https://www.youtube.com/watch?v=eIRFOWai9V4 Ed Fong DBJ-2 Portable Dual Band UHF/VHF Antenna - AF5DN]
* [https://www.youtube.com/watch?v=eIRFOWai9V4 Ed Fong DBJ-2 Portable Dual Band UHF/VHF Antenna - AF5DN]


Resources for creating a DBJ-2 antenna:
Resources for creating a DBJ-2 antenna:
* [https://edsantennas.weebly.com/uploads/2/9/3/5/29358461/dbj-2_qst.pdf https://edsantennas.weebly.com, PDF]
* [https://edsantennas.weebly.com/uploads/2/9/3/5/29358461/dbj-2_qst.pdf https://edsantennas.weebly.com, PDF]
* [https://www.qsl.net/sterling/Activities/20170301_J-Pole_Build/Emergency_antennas.pdf https://www.qsl.net, PDF]
* [https://www.qsl.net/sterling/Activities/20170301_J-Pole_Build/Emergency_antennas.pdf https://www.qsl.net, PDF]
Notes from the activity meeting:
* SWRs will change when the antenna is vertical or horizontal; only use them when they're vertical
* Soldering the BNC tips to the conductor can be tricky; if the insulator is getting too much heat, try using a small piece of wet tissue paper on the exposed conductor between the tip and the insulator
* When crimping the BNC to the feed line, the tight end of the crimp should be on the end of the feed line

Latest revision as of 04:33, 19 January 2023

Specs (from https://edsantennas.weebly.com and https://kbcubed.com:

  • 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:


Videos:


Resources for creating a DBJ-2 antenna:


Notes from the activity meeting:

  • SWRs will change when the antenna is vertical or horizontal; only use them when they're vertical
  • Soldering the BNC tips to the conductor can be tricky; if the insulator is getting too much heat, try using a small piece of wet tissue paper on the exposed conductor between the tip and the insulator
  • When crimping the BNC to the feed line, the tight end of the crimp should be on the end of the feed line