Testing SWR on Homebrew 1/4 Wave Antenna
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- #HamRadio #Antenna #SWR #RigExpert
In this video Kevin / N6VLF goes over 1/4 wave vertical antenna construction. He brings in a homebrew 70cm quarter wave vertical to demonstrate the importance of tuning it. Tuning this antenna is done by trimming the vertical piece as well as the ground planes. It is also important to bend the ground planes to the correct angle to achieve the best SWR. He is able to demonstrate these items very well as he has brought in a RigExpert and displays all the readings as he goes through his experiment.
Link to Coax Loss Video: • How to Measure Coax Lo...
Love your videos. So informative and helpful. Makes me think and puts me in the experimental mode to see how I can improve my antenna system.👍
That is awesome to hear! Kevin, does a great job dreaming these presentations up for our monthly meetings. Thank you for being apart of this channel.
This is really great stuff, thanks guys
Glad you enjoyed it! Thanks!
Wow! Interesting presentation.
Thank you!
Thanks Kevin and Jason, another excellent presentation
Thank You!!
My backup for my backup is a VHF UHF mag mount antana on my grandmother's cast iron 18inches skillet upsides down. If a Hurricane takes my tower down I can still talk using my VHF UHF radio.
Alright, good thinking!
Great videos, well worth looking at. Thanks!
Thanks You!
Seeing brings believing. Wow.
Thank You!
Made one of these 10 years ago with 3 ground elements at 16cm's length.works better that my friends far more expensive msg mount on his boat
1/4 antennas are nothing more than a complex capacitor. 2 conductors isolated by a dilecetric. By adjusting the angle (or increasing the space) of the ground plane, you are changing the capacitance. It will be most noticable using a Smith chart to tune the antenna. None the less great video. Keep them coming! Side note, not using 1/2 wave length increment of coax will change the angle of the ground plane and resonate length of the driven element. As far as DB loss of coax, the only thing that anyone can do is buy a better quality of coax. If a coax company doesn't offer a datasheet for the coax they manufacture don't buy it!
@Alter Kater a bit like a Gimmick 2 pieces of wire or conductors separated by a dielectric made of an insulator including air. Forms a Capacitor.
Thanks for stopping by and sharing the info, Seven O'Seven.
You should make a video of that 1/4 antenna bro.
Hi Kevin, can I use old TV telescopic antenna to build 1/4 wave ground plane antenna for VHF/UHF? Thanks.
You certainly can but a solid piece of wire or Steel Rod would have less loss due to not having joints between the telescoping sections. Aluminium or Copper or Brass Rod would be best..Just be careful you don't cut it too short tho...At least with the Telescoping Antennas it's realy easy to add the lenght back..
Good Luck with your experimenting...Home brew is the best way to learn.
73de Steve M0BFM Liverpool UK
If it conducts, it can be used as an antenna/ground plane. Type of metals and how they are constructed will vary your results, just as Steve mentioned.
Love this channel. Hello Jason if you’re around
Thanks Man! I'm always around, Kevin is just the talent. lol
More downward angle may help 60 degs?
Great Tip, Thanks!
2E0NMK -Simon very interesting video just wondering which Rig expert it was and what is the software is it free /paid for .Would love to see a lot more of these videos is the file depository so I can watch over these again.
Thank You! It’s the AA-600 plugged into the laptop. The software is on the analyzer, the computer then allows you to interface with it via USB cable.
The application is called AntScope and is a free download from the RigExpert website.
Btw would love to see him demo a video on gain. Dbd vs dbi on Yagi antennas
Great idea. I forwarded this to Kevin.
Ham Radio TV or yagis vs log periodic vs quads. Field strength. Return loss etc.
This guy sounds remarkably like Donald Trump at times XD
lol