How to make a Dual Band Rollup J pole Antenna for 2 meters and 70 centimeters!!
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- Опубліковано 7 лип 2024
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#MNHR
Ed recommends tuning it as you go. First you tune the UHF section. Then when you add the stub to the bottom *nothing should change*. If it does, your stub needs tuned because it’s not 1/4λ UHF. Once you have that, then solder the shorted (top) end of the stub to the VHF portion and tune it again.
Around 9:37 ... when you attached the RG174 stub, leaving the remnants of the 300 ohm cable in place (presumably for rigidity) may affect the performance of the antenna. In the Fong original, only the stub itself is across that gap -- no original wire is adjacent to it.
I love your video Sir! Thank you for all the information!!!
I ordered my from Ed Fong! And it works great. It didn't cost that much and it supports his things. At this time I think they can use it because they were closed down for almost a year. 73. W4DES
👍Great simple antenna for portable or base station use. These rollup window line J-poles are hard to beat in terms of size, weight and ease of use.
They are hard to beat like you said, they work great! Thanks for the comment and for watching!
Good video and these are excellent antennas, i have mounted in the PVC and mounted on my desktop inside as my emergency antennas. 73. KV5P
3:20 for any jpole you want the ground (shield) connected to the 1/4λ section. It does matter.
I saw the SOTA flag and 4runner in your intro and knew instantly you'd be trustworthy. I've been wanting to build one of these and my buddy who just did sent me your vid. Good stuff, thanks for putting it up. This'll be my next antenna project. K0ATV
Great video! I have one of these antennas and they are great! I think I am going to have to try and make one for one of the kids to use!
Thanks Craig , yea pretty easy build!
Thanks for this video Chuck. I've seen several versions of this antenna and seen videos of Dr Ed Fong talking about it. Your video was very easy to follow and I think I might have a go at building one. Best 73 G6XIB
One small suggestion - Basing one measurement off of the previously measured mark can lead to stacking inaccuracies. Fat marking pens add to this problem. My recommendation is to do the math and then measure everything from a common baseline.
@@Sagart999 Thanks for the reminder, that's a good practice I did know but had forgotten! 👍
Great video
Nytewolf where have you been?
@@KK6USYHamRadioAdventures been super busy with work. I have been a strong member of the Replay squad lol. I will be in the Coffee and Ham live stream Saturday. Finally have sometime to breathe
Neat take a piece of courage and on the air.
73 KQ4CD Paul
#MNHR
Team replay for the win!
Great video man. Thanks.
Hello great video thanks I will make one of these when I manage to buy a NanoVNA. I have the ladder line just need the nanovna some coax and some connectors of and clip in ferrites.
Motters
M7TRS 🇬🇧 73
Great you will like it. Thanks for watching and commenting!
Great video, thanks! Could this work with RG8 coax just as well?
Yea It should be just fine for a feed line just heavier . If it's for home that would be great, thanks for the comment and watching!
Another fine video Chuck, what it the brand/model of helping hands you’re using? I really like that large design.
You’ve also inspired me to do my own videos, I finally made my first one showing the MARS mod of an IC-735, I can’t believe none existed on the subject.
Gary, I put a amazon link in the video description for the helping hands and my soldering station. That's awesome on doing video welcome YT, I will check it out!
Can you use the thinner clear type ribbon wire if it's 300ohm?
Dude, soo metal. chuga chuga. LOL
i have some 450ohm ladder line/twinlead would following these measements be compatable?
Thank you for making this video
Yes it should work just fine, you might have to adjust a little for the velocity factor of your wire but it should be close!
@@KK6USYHamRadioAdventures Great. Many thanks for the reply and for yout time making this detailed video
What app do you use to log on your phone
Can you do a video on how to build an Ed Fong GMRS antenna?
Yea I can try that. I will need to check out the epecs.
What kind of distance do you think a slim jim could get in a semi mountainous area on a ht? I'm studying to get my Tech, just looking into what gear to get now. Thanks.
I have a uv5r v3 and vx6r. It’s relatively easily hit mt diablo and mt vaca repeaters from west Sacramento depending where I stand outside on my balcony 🤷🏼♂️ figure they’re ~40-50 miles from me. They hear me through some snow but an antenna upgrade like this I should do a lot better.
If you get up on a peak and put it up say 10' it will do really well, like KazzArie said easy 50 miles maybe more. Check out this video, I was camping and setting at the base of a hill in a valley and my contact were 50+ miles. The contacts are near the end of the video. ua-cam.com/video/H0u1jBiGIp4/v-deo.html
Hey was that a Primus reference snuck in there?!
Hahah I don't remember but I do know Les
@@KK6USYHamRadioAdventures as in, personally know him?
@@whomhead01 Well it's been a while but he worked for me prior to primus when he was in Blind Illusion
@@KK6USYHamRadioAdventures that's amazing!
@@whomhead01 You got me interested and yes it was a Primus reference!
where did you find the window line?
I think I purchased at DX Engineering.
Great video. I think I would like to make a roll up jpole for portable ops. I have one that I bought off of ebay and it works great. It is my main antenna at my QTH for VHF and it is a good performer. I can hit a repeater 50 miles away with my yaseau 857 at 50 watts .
73 George KB3WAQ
George Go for it on making one . and yes they do perform very good I was impressed!
Great video. How about a PDF with all the Specs?
Rick I think I put a link to the site with all the specs in the description, but I will check and add it if not.
Well I forgot it thanks , I added it.
The 70cm repeater here is at 434mhz - how do I tune it for 434 and not 440? Trim the last part only?
What most people fail to tell you, is that you can adjusting the tuning by moving the coax soldering point, up / down, at the base of the antenna!
I have cut, and trimmed an antenna before, and it Never got the damned thing tuned right! The key is the base connection has to be in a Sweet Spot.
Thanks for the video 2m is all I would need 70cm inactive around here. Looking forward to start my SOTA 2021 once wx cools off from summer. That style of ribbon is hard to find in vk land. vk5cz ..
Willian. Direction , One of the Hayden from Ham Radio DX gave me a site he has used in vk land .www.strictlyham.com.au/browse-by-type/coaxial-cable/open-wire-line . I hope this helps , thanks for watching!
a trick: you can watch movies at Flixzone. Me and my gf have been using them for watching lots of of movies recently.
@Zain Nicholas yup, I've been watching on Flixzone} for since november myself :D
@Zain Nicholas yup, I've been using flixzone} for since december myself :)
@Zain Nicholas yup, I have been watching on flixzone} for months myself =)
What kind of cable is this? I would like to buy something similar to this, but since I am new I have no idea how to search for this cable
300 ohm ladder line , try DX Engineering
do you remember what freq you were using for SOTA contacts
For 2m depends 146.520 or 146.580. I might start on 520 if not busy and usually switch to 580
@@KK6USYHamRadioAdventures thanks! Are you beaming SSB w horizontal prop, or FM w vertical
@@PatAutrey I think I only did vertical FM, I have better antennas for SSB
Where in the world do you find 300ohm antenna these days?
Tis where I purchased mine ,
www.amateurradiosupplies.com/product-p/20116.htm
Make sure you know what the 300 ohm line is constructed with. Some have foam filled dielectric and will throw off all the measurements.
Abbree 42.5" antenna is superior to slim Jim design for a fraction of the cost. I hang my abbree 65' in tree side by side with the slim Jim.
I just made one, did not resonate on 2 meter lol. 70cm works though
Good video, background music not so much.
I'm glad you liked the video!
This state has really gone to crap lately......
FBK antenna is better and easy to make, swr on uhf is 1:1 (430k to 440k) and 1:1 on vhf , Try it -73's - LW4DFA.