How to build a simple dipole antenna for CB / 11 meter band radio in Costa Rica
HTML-код
- Опубликовано: 18 янв 2025
- I put a stick where the coax joins with the antenna to make it more level. Although you don't need a balun, you can get/make one if you want. You can also make an "ugly balun" or use clip-on ferrites. It is important to note that an "ugly balun" is actually just a common mode RF choke, it doesn't affect impedence or match different systems together. However it will keep RF where its supposed to be (in the antenna). See: www.worldwided... . Just coil some coax around a cylinder 5-6 times, basically.
In the future I will try to put up a new video with a Nano VNA (to measure SWR).
In this video we are making a quick improvised dipole antenna for citizens band radio. It really should have a center support where the coaxial meets the actual dipoles - this will also help prevent water from going into the coaxial cable if and when it rains. This does NOT have (or need) a balun, although you can make a balun yourself.
In the future I will be making more videos on my radio exploits using limited resources, improvisation, and the good old ionosphere.
so brilliantly , simply brilliant
love from Canterbury uk❤
You can gain about 1/2 db in power by making a full wave antenna. 18 feet on each side. You could use wire nuts to connect the wires. Fill them with rubber cement or vaseline for water proofing.
Did you cut the length on both of the top 2 wires to bring swr down..Cut until it comes down on both sides.
Very useful giveaway. Good video too.
Feeding a balanced antenna with coax absolutely requires at least an ugly balun to prevent feedline becoming part of the antenna system.
Thank you!
thanks Patricio nice job 10/4
you on the right channel channel 26 you might be hearing smokey mtn skip chasers group in tn for skip.
I just put mine up two or three days ago and I have the same issue I can hear people having conversations but apparently they can't hear me but mine is only stapled to the front of my porch garage enclosure so maybe 10 to 12 ft. I plan to get some rope and some longer coax and get it straightened up at least 30 or 40 ft above the roof lines.
Hey, thanks for your reply. One reason is that the polarization of this antenna is horizontal, and most others are using vertically polarized antennas. You need to put hundreds of times more transmit power into a horizontally polarized antenna like this in order to achieve the equivalent output power of a vertical antenna transmitting at a fraction of the power. I will try and make another video about this someday, but in the meantime changing to a vertical antenna you may get better local results.
@@FoxyLobo I appreciate your response brother. That makes sense why I was able to hear but nobody could hear me so I would have to get an amplifier in line? How is yours working now? I'm getting ready to change my dipole and put it vertical I just got to get some time and get some ropes and wait for my longer coax cable to come in is that what you ended up doing with yours?
@@brandonlaragirl It's always nice to talk radio with other people :). I wouldn't go the amp route unless you plan to do that anyway. I would just make another antenna out of a piece of vertical wire cut to a resonant wavelength that won't have a high standing wave ratio. Run the central portion of the coax through a balun (it's good practice as people are saying here - you can buy one or make one) to the vertical antenna and the outer braid of the coax to a radial system (ground), just a bunch of wires radiating outward in a circle slightly below the ground where you put the antenna. I would keep it away from structures to allow the radiation to travel freely into space so you can get the most contacts in the most directions.
@@FoxyLobo agreed it really is an awesome hobby I wish I would have gotten into it many years ago. So just to clarify the inner cable that's insulated in the coax is the only part that really does all the work? I keep asking people but I'm not really getting a straight answer the way I have mine set up I'm using the outer shield and cop proportion connected to one piece of 102 inch wire and the intercourse section connected to another piece of 102 inch wire. Opposing each other at 180° and then my coax just running straight down to the radio on the ground.
@@brandonlaragirl In regards to what part of the antenna is doing the work, it's 50%-50%, the ground/radials make the impedance the same as the radio - that's what I was told. However in terms of radiating the signal the radiating element is critical. Can you clarify what "cop proportion" and "intercourse section" mean? Yes, the two legs of the dipole should not be any less than 90*. It is ok if they are less than 180*, you should still get the same general radiation pattern from the dipole.
Your connections arent very good, the wire is a bit corroded. Clean up the wires and join with solder if you can.
Did you measure the SWR, it seems your radio can do that.
If possible, try half wave length of wire, or even full wave (11meters or so) for better radiation...
you should stick with 27.385mhz LSB or ch 38,37,40.
your best best bet if wanna talk skip make portable antenna setup just go up that mountain there get on mobile and setup your antenna in a tree or make it into pvc setup if have local parks in your area, my best you need 102 inches make on those antennas out speaker wire or bare copper wire you need 12 gauge or 18 gauge.
Thank you!
look at channel 28 on am it one big skip in south east United States.
Should be soldering them connections.
He should have foned his friends first and tell them what time he will be on the air:) lol:)
You rigged it 😂😂😂😂😂😅😅😮😮