I just got some surplus 300 Ohm twinlead (for free!) at a ham swap, and I already have a lot of RG-174. So now I can make several of the Ed Fong DBJ-2's to hand out as gifts to other hams. I'll make some roll-up versions and some 'stick in a plastic tube' type. It's nice to finally be retired. :)
I have and use a commercially made roll-up J-pole antenna for 2 meters. It works well, and I keep it in my pack for portable use. You have inspired me to make your design mounted in a pipe for use with my van when parked. There is always more satisfaction with something you build yourself. DE WA1KLI
@@99Victor Hello, thanks for watching! The IC-705 provides for a plot-SWR measurement, i.e. you can analyse the antenna SWR response over the entire range of set frequencies, so I used this great feature. All the detailed steps on how to use this feature are very well desribed in the Advanced User Manual, chapter 9.4 , I wouldn't do it better :) This antenna is a FM VHF /UHF workhorse, working equally nice as portable and as a fixed antenna. It performs better, in my opinion, than a 1/4 wl ground plane vertical, but surely not better than, for instance, a colinear array of multiple vertical dipoles :). As it comes to the contacts, I easily take part in local 2m/70cm nets, open local digital repeaters , all the daily routine on the FM mode may demand. In case I take part in some dx activities in CW or SSB modes, like contests or activity days, I mostly use my horizontal polarization stacked 2x9EL Yagies. But I also always have my J-pole with me for local FM communications. HTH, 73! Linas LY2H
I really like the performance of DeFong antennas. I use mine for several operations including bike events for APRS and coms.
Excellent explanation ! It looks quite complicated but I am sure then end results are good.
Nice Video! Just an Idea, for another video: Show your Ham Radio Van. I'm very interested to see the interior.
Thanks! My Radio Van is covered with snow at the moment :) But I will make a tour-de-table video when the weather permits… 73! Merry Xmas! Linas LY2H
I just got some surplus 300 Ohm twinlead (for free!) at a ham swap, and I already have a lot of RG-174. So now I can make several of the Ed Fong DBJ-2's to hand out as gifts to other hams. I'll make some roll-up versions and some 'stick in a plastic tube' type. It's nice to finally be retired. :)
Excellent Xmas idea! HNY and 73! Linas LY2H
Very detailed, thanks for sharing! Davey --KU9L
Profesionaliai.
I have and use a commercially made roll-up J-pole antenna for 2 meters. It works well, and I keep it in my pack for portable use. You have inspired me to make your design mounted in a pipe for use with my van when parked. There is always more satisfaction with something you build yourself. DE WA1KLI
How did you check (step x step) the swr on the 705? Where are you contacts at; how far away where they? I'm inpressed!
@@99Victor Hello, thanks for watching! The IC-705 provides for a plot-SWR measurement, i.e. you can analyse the antenna SWR response over the entire range of set frequencies, so I used this great feature. All the detailed steps on how to use this feature are very well desribed in the Advanced User Manual, chapter 9.4 , I wouldn't do it better :) This antenna is a FM VHF /UHF workhorse, working equally nice as portable and as a fixed antenna. It performs better, in my opinion, than a 1/4 wl ground plane vertical, but surely not better than, for instance, a colinear array of multiple vertical dipoles :). As it comes to the contacts, I easily take part in local 2m/70cm nets, open local digital repeaters , all the daily routine on the FM mode may demand. In case I take part in some dx activities in CW or SSB modes, like contests or activity days, I mostly use my horizontal polarization stacked 2x9EL Yagies. But I also always have my J-pole with me for local FM communications. HTH, 73! Linas LY2H