How to make a 2 meter roll up j-pole antenna using 300 ohm twin lead cable.
Пікірлер: 38
@RESlusher9 жыл бұрын
It's good to see ya back in front of the camera, Dave! I've got two questions. (1) Are those measurements you gave the same if I was using 450 ohm ladder-line? (2) How high could I run something like this up? Say I had 5 army surplus camo poles. Should I make the top one a fiberglass one? OK, so that's three questions! :)
@victornelson55689 жыл бұрын
Best videos on KZbin!
@RVArchery9 жыл бұрын
Nice antenna Dave. That's a lot like mine but instead of 300 ohm, I used 450 ohm window (ladder) line and it too, was my first home brew antenna. I also put an "air choke" on mine as well just for GP. Those antennas work really well and are great for portable use. Great video & 73 - KF7TOV
@izzzzzz64 жыл бұрын
Does it not effect the impedance with it that close to the wall? I would have thought you would need to have it hanging or supported in free air to get an accurate reading.
@SpectreOZ9 жыл бұрын
Cheers thanks for the alternative 300 Ohm twinlead design Dave...
@DoctorDon9 жыл бұрын
I've often found that taping the coax too close to the shorted end causes me to have trouble tuning it. But if I tape a couple of popsicle stick pieces between them that I have much better luck. I just offer that in case anyone has trouble with that themselves.
@jayhalfmoonfarm80949 жыл бұрын
I built one of these with some ladder line my uncle gave me and put a 70cm trap on it to make it duel band. it is a nice design I got off of CQ online.
@bigphil69808 жыл бұрын
hi could you use heat shrink instead of electrical tape to weather proof it more.keep up the great videos as I am learning a lot as a beginner in the hobby working for my foundation certification I cannot wait to try out some of your antennas, keep up the good work thanks from the UK
@justinavery40477 жыл бұрын
I would use heat shrink over the electric tape.
@BikerBytes4 жыл бұрын
I might give this antenna a go, I like its portability. I’m a noob so could do you explain what the purpose of the top part of the antenna does that you put a break in since it’s not now actually connected to anything. Thanks. Jason.
@ottowachter42559 жыл бұрын
Dave, thanks for the new interesting design.I'm looking for a 300ohm cable and shall make it.))73 from Ukraine !
@TheJimiking9 жыл бұрын
Thanks for another good video Dave. Have a question? Does the deferent length of feeder affect the SWR? 73, Jakub
@luizfranco36739 жыл бұрын
DAVE, Thanks for your antenna videos. 73, Franco - PY1EPU
@shifty2129 жыл бұрын
Hi Dave. Can I tune it by taking little by little off the top?
@grantfullen95599 жыл бұрын
Thanks for your antenna videos KM4BOB
@gregorybirchfield49526 жыл бұрын
Does your readings on swr change once you put it in the pipe ?
@andreVE4BK2 жыл бұрын
Aren't the measurements different if you put your J-Pole inside a PVC pipe? Thanks
@christopherdcorran3 жыл бұрын
Is that version of J-Pole OK at 70 cm? Often a resonant antenna at 2 m has a broad harmonic around 70 cm and serves as a Dual Band. I'm looking at making a copper pipe J-Pole but one of these inside a PVC tube looks like a great option!
@usarmyfl19 жыл бұрын
Wow thanks for sharing this video. Until now, all I have found as far as a roll up sim jim was the one made by N9TAX, and Nelson Antennas, which I am sure are great and not a bad price, but I had no idea it was this easy to make. Does anyone know how this one compares to the N9TAX or the Nelson antennas version? Thanks!
@larryjackson60645 жыл бұрын
Thank's Dave ! 73 KK4SPW Larry
@1fanger9 жыл бұрын
Hi, what are your thoughts on using heavy gauge speaker wire in the same configuration? Thanks of your videos, 73, Joe KC3BXZ
@piukeyen5 жыл бұрын
Hi! Did you try making one with speaker wire? I've been wondering the same. Wire speaker is more maleable, but it can also twist on itself, would that deform the radiation pattern? 73 de LU4HAM
@stephenwilliams52014 жыл бұрын
Ha ha. Have to begg to get recognition. Here. Then somebody cuts the repeater off. Simplex near by works fine, and found that as little 2.2 watts covers over 30 miles. All the way up at 5. It's Scarry. Tks for good show.
@vrb19606 жыл бұрын
I’m from Raytown, really enjoy your videos, thanks. Which repeater do monitor regularly, N0DPR\ Brad.
@lenmcclellan69679 жыл бұрын
Thanks Dave you have some great videos. Len KE0DQS
@vo1um19 жыл бұрын
Dave .. have you ever made a beam antenna for 1090 mhz .. i am vo1um and as part of my Amateur Radio hobby i also like to track Air Planes.... if u have made a beam for this band could u post the link if not would u consider do a video of one.. and sharing it...
@jeffcauhape68802 жыл бұрын
Could you post the dimensions in terms of target frequency?
@ralph99872 жыл бұрын
i would live to make this antenna for marine vhf on 156.8Mhz. where can i get then dimensions for the marine band
@TiredOldMann7 жыл бұрын
What would be the range talking to someone on another hand held radio?
@chriswalport35999 жыл бұрын
Could you use a j-pole For a scanner? If so how Would it be made or modify? Pm me please about this Have lot more questions.
@N2LRB9 жыл бұрын
Dave, I have seen other videos where putting a twin lead J-Pole (N9TAX) inside a pvc pipe de-tunes the antenna. In your video you did not show yourself using the J-Pole in a pvc pipe. I wonder why yours does not de-tune?
@DaveTadlock9 жыл бұрын
No reason not to use the antenna in the pipe other than just installing it somewhere. I've not had any problem with it inside PVC pipe.
@cougarhunter339 жыл бұрын
It would seem to me that PVC pipe would electrically be the same as air.
@robertabuonanno71537 жыл бұрын
N2LRB è
@najlepiejsmakuje40638 жыл бұрын
hi how to make 2 meter twin lead j pole antenna for 173.000 Mhz ?
@eduardomarcal60909 жыл бұрын
Can we put 50W on it? Thanks for videos Dave. Eduardo - PU2UW
@justinavery40477 жыл бұрын
Yes, I use mine for 25W all the time. and 65W sometimes. I read somewhere that people have tested them up to 100W.