FM Radio Station Antenna DIPOLE For FM Transmitter DIY Design For Radio Station Broadcast homemade
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- čas přidán 3. 09. 2023
- FM dipole antenna. This is great for a home build and fm dipole antenna diy is fun. FM Dipole Radio Station Antenna Homemade For FM Transmitter . This antenna is an FM dipole which is a half wave antenna. How to build FM transmitter antenna from scratch. You can make it yourself from basic parts that you can find at a hardware store. DIY antenna build with instructions on how to put it together. Easy FM antenna construction and a great antenna for radio broadcasting. This antenna can handle a lot of power but it has not been professionally rated so don't use more than 30 watts with this antenna. Even though this antenna is designed for FM broadcast if you want to know how to make a dipole antenna for amateur radio then by simply adjusting the measurements to match the amateur band frequencies this dipole can work for that too.Its really just the fm dipole antenna length that matters to change it. This is an outdoor fm dipole antenna and really for indoor use. If you would like to build fm dipole antenna then this video will show you every step. Making an fm dipole antenna is actually not as hard as it might seem. At first glance it might seem daunting but this is a simple fm dipole that is basic but solid and puts out a great signal.
#fmantenna #fmtransmitter #piratebroadcast #radiostation #transmitter #fmbroadcast #fmradio #radiostations #antennahack #fmdipole #pirateradio #broadcasting #broadcast #howto #howtobuild
Downloadable instruction document:
As soon as it is ready a link will be here to purchase the complete build instruction doc.
To build a radio station you will need a good antenna. Some antennas work as stand-alone antennas while others work in an antenna array. The FM half wave dipole can work as a stand-alone antenna as well as be built into a multi-antenna array. The FM dipole is the industry standard for radio station antenna array set ups for FM transmitters. Antenna stacks can be as small as two matched pair antennas and as big as the structure you have to hold the antennas. The FM dipole antennas need to be the same design and be tuned before they can be added to am antenna array. Even though FM dipole antennas are theoretically the same the smallest differences can affect the radio signal radiation pattern. That is why having the FM dipoles being the same reduces the chances of multipath interference. diy fm dipole antenna for a fun hobby. - Věda a technologie
30 year plus veteran broadcast engineer here, let me see your breakdown of these antennas is quite good. This video actually serves two purposes one to explain in layman's terms what's going to happen. And also the technicians that get too deep into the engineering., I have seen some antenna Rays with as many as 16 circular polarized dipoles stock at one wavelength apart, taking up most of a 400 ft tower. All being fed using Ridgid cable. I've also made them with rg59 coat hangers and PVC pipe. The only limiting factor is rg59 can only withstand about 100 watts. In that case we would use rg11, which can handle approximately 500 to 1000 watts. Usually we design each dipole to handle 50% of the total power will be feeding into the system even if it's a four-way system, will still design them to take usually around 400 watts each. I've also seen systems, where you have four dipoles on the tower. The cables on them are all long enough to reach the ground. And then all of the same length. Each dipole is connected to the output of a separate power amplifier, the inputs to the power amplifier are generated by a divider Network after the exciter. Essentially the phase splitting and alignment, is done at the input of the amplifiers has the amplifiers do not add significant phase shift. This can't be said for all amplifiers. But in most cases the modern solid state ones can do this. It's actually possible to obtain 100,000 watts effective radiator power using only 10kw of amplifier. Each dipole, is built into 50 ohm antenna. All the cables are exactly the same length of 50 ohm coax. And yes this uses hundreds of feet of coax to do this. You must have the same length at the Top Antenna as at the bottom antenna then all the cables are ran back to the transmitter. Where you would have the output of 10 seperate power amplifiers. Each power amplifier feeds one antenna.. the input of each amplifier, comes from a power divider network. Essentially the same thing you're building for the antennas with coax, you build a smaller version that stays down with the amplifier. The beauty of the system is that it's easy to install you just roll up the excess coax and cable tie it to the tower. Once you have all the antennas spaced on the tower and everything is ready to go. With the multiplied gain of 10 dipole antennas, we're being effective radiated power of 100,000 watts. The true beauty in the system. Is that should you decide you want a small amount of beam tilt, either up or down it's going to be accomplished by just changing the length of the coax feeding the power amplifier to that antenna. And up or down beam till is easily added
Wow it's always great to hear about the big installations and to hear from broadcast industry professionals. So thanks for your input. I unfortunately never got work on such big set ups. It's even difficult to comprehend that kind of power and all the issues that go with it. In most of my set ups if it went wrong the transmitter would go into safe mode until you fix the problem with no real consequences but at your power levels it's a whole different ball game. The cost as well in a completely different league. I think the majority of my viewers will never encounter set ups like you have worked on so always interesting to get some input about it. Thanks for you nice compliment. I do try my best to make my videos as accurate as possible while making them as understandable for everyone as possible. The majority of my viewers are first timers so I try to make the information as accessible as possible. Thanks again for your input. Always appreciate getting feedback from professionals. Cheers :)
This is an excellent and very detailed video. I appreciate the time and effort you put into it.
A few years ago I made a dipole by enclosing copper wire inside 1/2" PVC pipe. However, it was cut to one frequency so changing frequencies is not possible.
I used a washer on each end of the pipe, inserted a zip tie through the washer and secured it to the end of the copper wire so it would not collapse inside the PVC pipe. Next, I capped each end and sealed all holes and mating surfaces. I did not consider the VOP through PVC pipe because it was not necessary for my needs. I only wanted it to reach my garage, but during my first test, I found that it would reach 1.5 miles with a half a watt.
I really enjoy building my own antennas. I found that it is fairly easy to have a great antenna without spending a lot of money.
Funny that you should mention your homemade antenna with PVC pipes. I have been considering making a video about making the cheapest antenna ever using PVC etc. The tuning part is where I got stuck. I have tried many variations on it to make it tunable but not too much success yet. I have almost solved it but it's still in the making lol. I will post it as soon as I am happy with the design. The problem is that the kind of PVC that is useful can be almost as expensive as thin aluminum. If you do it right aluminum and spring steel like flexible antenna rods are cheaper and make the antenna tunable. Oh by the way, yes 0.5 of a watt is actually a huge amount of power. If high enough it can reach up to 7 miles. You need as little as 0.05 watts to reach your garage. Thanks for your comment. Always fun to chat about these things.
@@inspiresoundpro I prefer aluminum but PVC is very cheap and very easy to get where I live. The downside is not being able to tune for another frequency, the upside is I get to build another antenna! I have built several. Some are just for receiving and they work great. Unfortunately, many FM stations here are owned by just a few major corporations using very similar formats. Originality is nonexistent.
When I tested the range, it was with the antenna standing in a corner inside my house. I never mounted it. Actually, since it was far more capable than needed, I only used it one day out of the week while I was working outside.
I subscribed to your channel. I like the content and look forward to your next build.
Hey, thanks for the sub. I'm glad you like the videos. I am busy working on a quarter-wave design. It's a bit more difficult to build than the half-wave dipole but it's great for an omnidirectional signal. Dipoles are a bit directional. I will post it when it's ready. Cheers
It is amazing how much work went into making this video. Amazing :D
Thanks so much. Yeah it was the most time I have put into a video so far so thanks for noticing and mentioning it. Really appreciate it :)
I appreciate the graphical detail and wish other could use it along with real pics of what is going on. This is what information sharing is all about. Making it understandable.
Thank you. Yeah I try my best. It is difficult though to create these kinds of graphics so are not as common. The only other way is to use things like CAD graphics which is very unlikely. But I hope its clear enough. Thanks. Cheers :)
and not to forget: the video is super!
Thank you I'm glad you enjoyed the video :)
Thank you! I will be using this antenna to simply receive FM signals. How would I adjust the aluminum rods to tune it to a specific frequency? The video you recommend at the end titled, ‘FM Transmitter How To Build Circuit DIY Homemade’ does not explain how to tune (adjust the aluminum rods) on this adjustable Dipole antenna for maximum receiving of FM signals. Maybe I missed something. Thank you again. I like the way you explain the build process. Very clear and thorough!
You are very welcome :) Yes I have a video on how to tune antennas. My channel is mostly focused on transmitting but the same principles apply for receiving. Only problem is that to tune the antenna perfectly you actually need to run a transmitter into in to measure the return signal or you have to buy a fairly expensive antenna analyzer. The best option for receiver antenna is to simply adjust the antenna by physical length to as close to the signal wavelength as possible. The video to watch is this one : czcams.com/video/WOGX70-kIYA/video.html
It is intended for transmitters so most of the tuning wont apply but it does explain how to calculate the antenna length using an online calculator.
Un grand Mercie .
Je vous en prie. Je suis heureux que vous ayez apprécié la vidéo. Merci beaucoup :)
You are welcome. I'm glad you enjoyed the video. Thanks so much :)
Excellent video, but! You forget ballun. It is very important to have ballun between cable and dipole!
Hi. Thanks for your comment. Yes its true that it is commonly believed that a ballun is needed but in fact there are many engineers who believe that a balun is most likely to be done incorrectly and therefore would do more harm than good which is most likely when first time builders use one. The ballun can reduce some interference and match impedance but if the antenna is built correctly, tuned close to resonance, and installed correctly the ballan will most likely make no measurable difference to the transmitted signal. In two radio where the antenna is being used for transmitting and receiving then a ballun can be more noticeable but for a purely transmitting antenna which is what this design was intended for, a ballun is not really needed. I do appreciate your input though. Its always great to chat with people about this because it gives newcomers more insight into things they might not have heard of. And to add to this I ran a low power commercial radio station with a 1 Watt Fm transmitter and we did not use a ballun and the signal was fantastic. The reason is that the antenna was high up on a hill and tuned and installed very well. These things matter way more than a ballun. This is something I try to get my viewers to pay attention to more as it will dramatically affect their range. Thanks so much. Cheers.,
What is common to use a balance on HF frequencies, and VHF frequencies is not necessary, the dipole itself when Tim correctly should be almost a 50mm resistive load. So feeding it with a length of 50 ohm is perfectly acceptable. The phasing coax or power divider coax, it's usually made from 75 ohm, either rg11, or RG6 with Copper sheld, the point where the two interconnect, can be as simple as a basic coaxial t connector. Important part is to make sure that all of the coaxes are the same length. If one cable is even a few inches longer. It will cause the signals to not be in Phase when they leave the tower. You also have a high reflected power on your meter.
Thank you .Always great hear from people in the field. Yes as you said the idea of a ballun for all uses is not correct. In many cases the use of the ballun distracts people from paying attention to what you mentioned which can make a much bigger difference. Also I think some people think that the ballun fixes all problems which is not a good way to think. Thanks so much for your input. My viewers do seem to learn as much from the comments as the videos. Cheers :)
@allen_steel1236 ballun using not only to transform resistance. It is used as a bridge from an unbalanced coaxial cable and balanced dipole. If you connect them directly, there will be some standing waves on the body of the transmitter, and depending on how much power it can cause damage or errors on devices, connected to transmitter.
@@katushechnik Thank you. It's always great to add this kind of insight. It's the kind of thing new viewers enjoy seeing. Cheers.
Make a bulan coils using the coaxial cable, just roll a few turns Wil be ok, it's to unbalance to balance the coaxial and the dipole 👽👍📡 📻
There are two opposing opinions about baluns for dipoles. For receiving antennas it can make a difference with reducing interference so if you use the dipole to receive or as a two way communication antenna then yes it can be useful but if it is purely for transmitting like this dipole was designed for then you don't really need one. I have run very low power and a few hundred watts with no balun and had great signals. The antenna tuning was more important. In many cases a balun, especially the wrong type of balun can hurt the signal more than help it. So there are differing opinions but for transmitters I have found it best not to use one.
4...6..tur balun😊
Can I use this adjustable dipole antenna for simply receiving FM signals? All I want to do is receive a strong and clear FM signal on my FM receiver. In other words, is this adjustable Dipole antenna project ‘overkill’ for simply receiving FM signals or would I be better off simply building a fixed length basic dipole antenna? Thank you kindly for this DIY adjustable Dipole antenna project. Looks fantastic!
Thank you. I always enjoy it when people get some value form my videos :) Yes this antenna can work very well for receiving. It may be an overkill if you only want a slight improvement but if you are far from a transmitter like in rural areas then this antenna is great for that. You can also build a directional version but that would be way bigger and difficult to install. For transmitting and receiving this antenna, especially if you tune it to the frequency you want, will give a very strong signal.
@@inspiresoundpro Thank you. I am going to ask a different question and didn’t want to bury it here. This way others can see it more easily and learn from your answer. Thank you!
plz make on circular/cross polarized antenna also
I will work on it. Circular is much more complicated so it won't be soon but I will add it to my list to work on. Thanks so much :)
I am really enjoying your videos.
I dont know if its your wording or specifically how you explain things but your videos are very intuitive.
Thanks for the content.
Thank you so much. It's really awesome to get your feedback. It can sometimes takes weeks to make videos and when I release them I don't know if I did it right LOL. Some succeed some don't. I guess I'm always learning. Even though I have experience in broadcasting and video I am quite new to CZcams so there is always something new to learn. I try to make videos the way I would want to watch them so I try to solve problems the way I would need them solved for me so I think that's what makes it seem intuitive. Thanks so much for your feedback. It helps to keep going. Cheers :)
@@inspiresoundpro im sure your experience is a major player then. Knowing what is useful and relevant.
I feel like no matter the field, even with professionals they often fall back to cookie cutter recipes and give no thought to the reason or know little about the nuances of what makes it work. Thats great of we bake the same cake in the same kitchen. But for the rest of us in our own kitchen, it is amazing to have teachers to teach us why the oven temperature is set the way it is.
Agreed. That's why I don't even try to do things other channels are doing. I think of what I would like to see and then I try figure out how it should be best explained. I find that if I am doing it correctly that I end up learning new things too as I go along because I need to be able to re-create the solution myself. If I just do generic solutions it's often not really of any help to anyone.
i might have another question: why is the wood dowl only 5 cm long. For strenght it might be better of with 10 cm?
You can make the wooden dowl stick longer but it will not change the strength because the strength comes from the bolts holding the aluminum rods to the box.
hello, have the instructions already been out? is there a need the bolts are 10mm x 50 mm and 6mm in diameter? which material are they made of?
The idea behind the design is that it can be adapted to the parts available to you. A range of box, bolt and aluminum tubes can be used. The dimensions given are the ones that work well together but the dimensions can be adapted to your size box and aluminum rods. Some people have even adapted the design to other frequency bands like Vhf and uhf. The idea is not for it to be a one size only design but rather a template to adapt to what you have available. The wavelength for FM band though means keeping the lengths of the rods the same but most other things can change.
Seen mixed opinions regarding the spacing between poles and performance, anywhere from 5mm to 30mm. 3:15
Yeah according to more scientific studies it actually makes no difference but I find it easier to measure the antenna to tune it when it's 5mm .A bigger gap is confusing when tuning. Cheers.
Cheers. One day I might test it, that's part of the fun of antennas, experimenting. And using a half decent SDR/SDR software, even a .1 dBm change in reception can be observed.
Yeah lol I know what you mean. It's great fun. I'm a bit of a fanatic when it comes to fine tuning. Every tiny bit of improvement is exciting.
The antenna will perform the same, only the total length will be 25mm more. It's not that critical.
I did some testing and that appears to be the case. And from what I've read, the only reason you might consider increasing the spacing is to prevent sparking (for transmitting) @@hugoromeyn4582
0:20 "dimensions" is misspelled. red flag! oy, here we go...
Lol red flag!!! Lock him up he spelled a word wrong. Yeah this whole video must be a fake. There is no such thing as a dipole antenna if there is an incorrect spelling.
dear sir
i need 2 type of aluminium 1st is aluminum pipe and 2nd name is ?
and waht is aluminum pipe diameter ?
i have 300watt am amplifier
ple reply
Hi. The pipes are all aluminium. Aluminum is just the way Americans say aluminium. It's the same thing. The measurements for the pipes are all in the video. Check out the beginning where all the measurements are listed. 300 Watts might be too much power for this antenna. It has not been tested to handle that much power.
@@inspiresoundpro thanks a lot sir
Km Range?
The range of your signal depends on many factors. The height of the antenna has the most impact on range. The terrain and the power (Watts) of your transmitter also affects the range. Signal penetration is just as important as range and the power (Watts) of your transmitter affects penetration strength too. Basically the higher the antenna and stronger the transmitter the further you can go up to a point. Once you reach about 50 to 100 KM the signal cant go much further because of the curvature of the earth. In most cases though signals from about 10 Watts to a few hundred watts can make it about 30 to 50 KM. Very powerful signals of a few thousand watts and up can make it to about 100 KM.
@@inspiresoundpro Okay, thanks Bro ❤️