How To Make Coax Antennas (FM receiving) Folded Dipole
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- Опубліковано 15 жов 2024
- How to make a simple, good performing, and well matched VHF coax folded dipole antenna for receiving FM radio and TV signals. I use this one with my Video/Audio transmitter I made. I connect this to my TV.
Design Info Link:
www.nsw.wicen.o...
Link To Design Program:
www.dxzone.com...
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As an electrician that is pressed for time and needed a quick solution to a simple problem, I'd like to thank you for posting a simple vid explaining the importance of the math along with a link. Me and my customer thank you👏
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I tried one antenna for 98 MHz and it is working fine for the FM band. Thank you very much.
Thanks for this, it worked like a charm!
Just made an antenna to work in the FM radio, tunned to the 98Mhz (middle of the fm radio scope +/-) and with this i can listen to my radios crystal clear, thanks once again.
Glad it also worked well for you. Be sure to check out my other videos, share, and rate a Thumbs Up.
Thanks!
It works. FM receiption is very good. I think it will work fine as TV antenna for analog tv.
Thanks for that. I made mine for mid bandwidth, using maths from somewhere else.
This gave me a 95.66cm length for 98mhz bandwidth.
Works a treat right through the range wherever it's put.
this calc gives about 153cm for 98mhz.
Thanks for video, very interesting. I have made loads of these and am still amazed at how they work and they do work well.
Glad you like them! They do work well when properly made. Thanks for watching! Be sure to rate thumbs up.
What an amazing resource (the links). Learning more about antennas than I thought possible. Great work. Thanks
You're welcome! Be sure to check out my wide range of videos, and share. Thank you
@@electronicsNmore Can you use the coax design and connect it to one of those boxes that receive t.v. signal over the air? And would it improve the reception and bring in even more channels than waht the box brings in?
Thank you
FM receptions is great. Ohm reading at 83mhz = 50, at 95 = 200, at 107 = 50. Using RG6, would like avg closer to 75. I did not stip the ends completely. Stirpped back just enough to short the shield to the center.
ok, take 2. Trimmed each end and now get low of 60ohm and high of 107 at 99mhz. Problably as good as it gets
made a few of these now, as the 1/2 wave length model seems that the length are not that critical. It does work well. I have also calculated and made this into a 1/4 wave length and it worked well also. This is much better than the rubber duck antennae.
Yup this works awesome! I live in a rural area and before I could only tune a couple channels. Now I get something on almost every channel (95.7, 95.9, 101.1 etc) Not all are perfect but dozens and dozens are. It is great. Thank you
BTW I used the software recommended and put in 98.0 MHZ half way between 88 and 108
+jmanatee Glad my video was able to help you. Please share my videos with others and rate Thumbs Up.
Thanks!
Thanks. made one of these today to slap on a radio i bought from the good will for 15$
First off, this is a CUSTOM antenna. It is made for a specific frequency. Secondly, I had all the supplies I needed laying around the house, thirdly....DON'T be lazy!
Excellent plan, I was just wondering if I could use 2 conductor rca cable for the feed line, as the connector matches my radio or does it have to be coax? ( just makes for one less splice)
Well i just had the nerdiest Saturday night ever. My house is in a depression so i don't get very good radio reception, my favorite station is 94.7 and its weak anyway so i used the calculator, cut some RG-6, taped it to a dowel to stay straight, and wow does it work great. even if i get the coax feed near the antenna hookup everththing comes in great. I can pick up most stations up to .3 mhz side band. before i could only get like 1 or 2, now i have tons. Great project!
where is the link to the calculator? Thanks for posting this. Do you have any other links for understanding the math that makes antennas work? Thanks!!
I just get thin speaker wire and wrap it around my window frame inside in my brick building for my vintage Marantz 2215b and it works great no need to get fancy
Whatever works! :-) Thanks for watching
I DON'T KNOW ANYTHING ABOUT ANTENNAS. BUT I ONCE USED A COATED WIRE FASTENER FROM ANY OF YOUR KIDS TOYS PACKAGES. LIKE A TWIST TIE.
I substituted 3 conductor phone wire for RG6... key I think was to be picky about the measurements... I decided on a middle frequency of 99mhz and ended up point to point at both 3" 8.7" and 4'11" at the loop joint...
I ran the solid copper through the center uninterrupted and pulled the pairs to opposite sides of the feed wire....
pulled one side to ground and one to 75ohm input on receiver
unbelievable!! it works perfectly!!!!!! I received maybe 5 stations before doing this and now get well over 30 with perfect clarity... took me 20 min.... cost me nothing... Thanks for sharing!
could you post image of that antenna you made?
not much to see - up high in my garage so the pic isn't great - sorry.... the plastic 'thing' you see is a mounting channel for laminate flooring and I zip tied the wire to it (you could use anything but it was the first thing I had my hands on in the shop).
i64.tinypic.com/2dm61za.jpg
tinypic.com/r/2k1yzc/9
ah, i see, you used coax as feedline and 3 conductor phone wire as antenna.
i used thin wooden slat to support it, didn't make loops on the end, because i think they're there only to hang it somewhere or stretch it between 2 points.
i get better reception if it stays vertically...dunno if transmitter is polarized that way, or something is blocking horizontal path to me....
I thought the loops might have had something to do with capturing the rf but hanging it makes sense also. I think about the old UHF antenna having loops and figured there might be something to it... I should have mentioned that I used coax on the feedline as it comes out of a 75ohm adapter also (just what I had laying about... not entirely scientific).
Built mine and it works great.
Great to hear!
Thanks, this works great. My favorite station is at 101.5, so I used the formula L = 93.75/f. to determine that I need the length to be 92.5 cm and copied your setup. it's much, much better than the antenna that came with the radio.
I have a dipole style antenna for Tv and it's killer. I picked up 54 channels very very clear in SAN Diego, CA.
Yes, when properly made, they work very well. Thanks for watching! Be sure to rate thumbs up, check out my other videos, and share.
Being totally ignorant about antennas and radio waves, I found some of the information confusing leaving me with questions.
1) From the calculator app, using 98.2 MHz, the center point of US FM broadcast frequencies, I should make an antenna with overall length of 60.1222". Given that length, should the length be measured from the tip of the exposed inner cable wire at each end?
2) The calculator didn't indicate the length of the bare inner cable wire at each end. Because you said that the length is critical, what should it be given my FM antenna frequencies?
3) In pointing out soldering the copper shielding braid to the inner cable wire, you mentioned that 'it' should be a specific length carefully measured. What length were you referring to? The length of the braid? Also, you didn't mention what I take to be shrink tubing that covers the braid to where it is soldered. ??
Try orienting your T antenna 90 degrees to make it a side fed, vertically polarized omnidirectional antenna! Maybe do that in a follow up video. 🙂
I think others have tried that and determined that horizontal is best. Thanks for watching!
I'm not an expert on antennas, but I would make sure it is horizontal and one end pointing toward the transmitter.
Just made this. So if you solder both wires at ends of the top wire, the receiving end is shorted, correct? It makes no difference with the short wire from the Yamaha amp I tried...
Glad it worked well for you!
What would be your measurements of the antenna? good video
Hi, great posting and thank you. However I have one question. If the FM band has bandwidth from 88 MHz to 108 MHz, using Coaxial Dipoles by VE3SQB require to have a specific input. That means the antenna will perfectly work with specific frequency. Difference on cable length for 88 MHz OD: 1.7m / ID: 1.27m, and for 108 MHz OD: 1.38m / ID: 1.4m. What is the best length or frequency to use to have most of FM band reception ok. Thanks
Choose the middle of the band.
Thanks for the video. The calculator program linked gives the over-all length calculation, but it does not seem to give me calculations for the solder points that you mention are also critical. Am I missing something?
The program gives the total length and length from soldered point to soldered point. Thanks for watching!
@@electronicsNmore Thanks for answering my dumb guy question. I missed the program's "SELECT COAX FOR
VELOCITY LENGTH FORMULA" Box. Kinda important.
Trying to understand this...
My FM is going from 87,5 to 108 and I want to make an antenna for my Receiver.
From what I have understood and using COAXIAL DIPOLES by VS3SQB
Input FM 108 (middle of the FM band) - I get that I need a coaxial at 1.39 cm
Am I close?
And Do I need to expose some of the ends depending on the coaxial type?
This all looks like a fairly simple and great way to make an antenna. One thing about the video I think I do not understand. You said at the T junction you take the center conductor of the feed and attach to the shield on one side and the shield from the feed and attach to the shield on the other. You said the cross piece center conductor stays in tact. That all sounds good but then you solder the shield to the center conductor at both ends which would "short" the center and shield of the feed. That is the part I think I am misunderstanding.
Refer to the link in the video description area. You will see images.
Thanks.
The shield is cut in the middle. Therefore an open, so not a short.
You seem your happy with the performance, however i disagree on a few key points... Yes you need shield on your feeder of it will act like part of the antenna, your ANODE and ELECTRODE as they are called, in a simple dipole, do NOT need shield and can just be the copper center rod. both sides. the center is an isolator and can just be a non-conductive any old thing... pvc plastic, rubber hose, Plexiglas square. I would also avoid the connected loops at the ends, i know you want a place to hold it or tie it up however is gets sloppy on your length calculations and the actually physical characteristics in calculating how they truly behave with lines of flux could fill volumes. In basic science you always want to give a relative comparison. it received FM signals well as compared to what? NO antenna/ Reynolds wrap? twisted uncut coat hanger? You get the idea. Based on your video you really could use the $1.99 Wal-Mart special(or $1 at a dollar store and probably do better. Focus on what makes a good transmitter antenna and apply the same rules, because the rules are the same... Thanks for reading...
Nothing to disagree with. The design wasn't mine, and it works very well. If you think a Walmart or dollar store $1 - $2 antenna will work better, then you need to find another channel to watch. Thanks
Are you from Boston or New York?
Very nice antenna, although correct me if I'm wrong, but that's not folded dipole antenna. It's an ordinary dipole with matching circuit made with two pieces of coax. At 2:30 it's said it also matches balanced to non-balanced line. Has someone tried how it works with respect to that? You can have impedances matched but when symmetry is not converted you end up with your feeder shielding acting as a radiating element and the efficacy of the antenna depends on the feeder length.
I didn't design the antenna, but I can say it works very well. Thanks for watching! Be sure to rate thumbs up, check out my extensive video playlists, and share.
Good to hear! Check out my other videos as well.
Please can you help, I have a radio I have lost the antenna for, it has a male coax connection on the radio for the antenna and I need to make one to receive FM radio signal in England.
I tried wiring some coax to it with female connector and it only works if i strip the copper back and hold onto it!!?
It works, and VERY good.
This is a great video. You make a reference to a calculator but I don't see the link to it. Can you please post the list again. Thanks.
Look under the video in the "About" section. Don't forget to share, and rate a thumbs up.
Thanks For Watching!
A ha now I see nice job are you sure of your measents What freq is it cut for
Somehow I missed the link to the calculator??
What is the formula for the length? Where do I find the link, please. Thank you.
3,000,000/mHz frequency=meters something like that
@@furonwarrior The first number is supposed to be the speed of light in km/s and the second number is supposed to be your desired resonant frequency. I think you may have left out two zeros and also added a m to your Hz. Alternatively you may have added 4 zeroes, depending on wether you want to calculate using Hz or MHz.
L = 300 000 000 / frequency in Hz. Alternatively L = 300 / frequency in MHz.
I am not good at electronics. I kinda fumble through it until I get it right. But I don't see how this will work. I am probably wrong, but you soldered both ends to the center conductor. To me, that greats a dead short?
+Derek H there's really no circuit to short, it's just catching FM energy from air to hit the metal on each side and get amplified in the receiver. All lengths of metal in this grab it.
+Derek H It's a loop! So in that sense, yes, it's a short circuit. If you think of it as a DC circuit with electricity flowing into the antenna through the shielding on the cable that runs from the radio to the antenna, that electricity then feeds into the shield on one of the two branches of the "T", then back through the center conductor and out to the end of the other other branch of the "T", then in to the center of the "T" through the shielding of that branch, and finally to the center conductor in the cable that runs back to the radio.
Of course, this is not a DC circuit, it's an AC circuit. And the point of the circuit is to get as much electricity to flow through the loop as possible at a given frequency. It's called resonance, and the circuit is tuned to the resonant frequency by adjusting the length of the antenna.
Hi,
I just converted my shed into a workshop and fitted my old car stereo under the bench which sounds rather good :0) Except I can't use the radio yet.
Would this type of antenna work well with a car stereo please?
Cheers
Gary
Hey Gary. The antenna works just fine if proper;y made. Make sure you buy the proper coax connector for your radio. I would design one in the middle of the FM broadcast band(88-108mhz) around 100mhz.
Thanks For Watching!
electronicsNmore Excellent..Thanks
I love youtube, you can just about type anything in and somebody has made a video for it !
electronicsNmore Hi again, Am I right in saying for the range you suggest I need to type in 98 in the coax dipole calculator?
Cheers
Gary
Yes. Right in the middle should give very good performance.
electronicsNmore Pucker..Thanks :0)
I think I'll do what you did too and mount it inside some pvc tubing, which I can then clamp to the back wall of the shed on the outside, which is out of sight.
Hi, This about the video "Coax Antenna (FM receiving) Folded Dipole". I hv no clue about electronics but still wanted to build one for 98MHz (commercial FM band). I tried the software by VE3SQB for lengths but got all confused by Feet/Inches & Meters/CM. Can you please give me the figures in cms for the over-all length of the antenna (between the loops at each end). And also the length between the two solder joints (I guess it is velocity length). Looking forward to hear from you.
+SN N
Very simple, enter the frequency, then click the button for the measurement you want. IN, CM, etc. I have too many viewers and questions to be offering special assistance.
Thanks
Too short ........... . According to the calculations I did following my manual it comes out that 1\4 λ corresponds to 66.66 cm.
Watched multiple times and did some investigating to try to learn which "RG" Number relates to the ohm value.
It seems 50 ohm is optimum for FM listening. Can I build a coax dipole with 50 ohm horizontal and a center tap at 75 ohm
(f connector) to the FM tuner. or should horizontal and vertical wires be the same resistance value?
1) What "RG" Value is 50 ohms?
2) what "RG" value corresponds to 75 ohms?
3) should both wires be the same resistance?
Thanks
+David Barth
As a receiving antenna, you do not have to be too concerned about 50 or 75 ohm coax. Readily available 75 ohm coax will work just fine. Make it as shown in this video, and refer to the links posted in the video description area. Thanks.
+electronicsNmore Thank you. Which "RG" is 75 ohm?
+David Barth RG6 is a 75 ohm cable
~30 Ohms is best for power transmission, ~75 Ohms is best for noise suppression, and ~50 Ohms combines both to optimize for a little of both. ~ means numbers are rounded as the exact figures fall a couple Ohms below or above these figures.
So, wait a second, there's one appropriate length for a desired frequency, correct? I would assume that's the overall length of the antenna, so what is the relationship between the length from solder point to solder point and attenuated frequency?
Hi Ryan. The antenna works fine for the entire FM radio band if you make it for the middle of the band(98.5mhz), but the best result is when you make it for the EXACT frequency. Please refer to the link in the video description area for more info. Thanks for watching!
Great project. Which direction should it point in relation to a transmitter for best results? Should the axis of the aerial be at a right angle to the direction from which the signal is coming or in line with it?
Dipoles have null points inline with the axis. You want the perpendicular to the length of the dipole pointed at your target, meaning the dipole can be mounted either vertically or horizontally.
@@demef758 wow - he had to wait 8 years for that info lol..
What if you want to boost the signal of the FM radio (I mean the regular
entertainment radio)? You have to calculate the length for each channel
and make multiple antenas for every channel? Thank you.
+Kketansa Art
No. Just make (1) antenna for the center of the band you're using.(98mhz) should be fine
electronicsNmore
Thank you :))
a bit confused, is the baided shielding soldered to the solid core lead at each end?
and which measurement is which? what is the top width measurement?
Yes. The braided shielding is soldered at each end to the solid wire core. Use the provided links to get measurements for your antenna. Thanks
@@electronicsNmore Got `er done, This does work great.
what are the chances of this increasing signal level to where it's sufficient for decent stereo reception (in a place were even stick antenna is not that bad)?
Experiment. I striped seven inches of 75 Ohm coax sheathing and then separated aluminum braid off center conductor, then strips foil and insulator off center conductor. Wrap the braid around itself into a coil of braided wire and angle so both the braid and center conductor form a "T" with the remainder of coax being the vertical axis of "T". Once this is done take and bend approximately half the center conductor upwards and half the braid wrap downward. You should get reception (Mine got 71 percent reception and most channels but this was merely an experiment).
hallo.i have a 3c-2v coax cable but the antenna calculator does not have this option,what should i pick?and diference bettwen foam or not?how could i tell?(scuze my englisch)
besides impedance, does the feed line length matter? thanks for the video.
+Richard Stubing
Hello Richard. I'm not an "Antenna" expert, but the length is not too much of an issue. Ideally you should keep the feed line as short as possible, and do not coil up the wire.
Good day, Sir. We're actually having a project on antennas and we're assigned to do the folded dipole. I just wanna clarify something about this antenna that you've made. You've mentioned here, as the video title itself, that it's actually a folded dipole antenna. I just wanna ask if this is different from the traditional 300 ohm impedance folded dipole antenna that uses folded tubes. Also, I also wanna ask about the theory behind this version of the folded dipole. We badly need an explanation on how you came up with this antenna design so that we can also explain our project during our presentation. Thank you, Sir. Hoping for your response asap. :)
Hi Shaira,
Everything you need to know is at this link:
www.nsw.wicen.org.au/technical/projects/coaxial-folded-dipole-antenna
Thanks For Watching! Be sure to share and rate Thumbs Up.
electronicsNmore Thank you for the link.
You're welcome.
This is probably going to sound stupid and impractical, but I've always been curious about this, so I'll ask anyway. If I were to make this antenna or even a simple dipole antenna made from old-fashioned twinlead (made a few of those in the past), and found a way to waterproof and stabilize it for outside mounting, would I get decent reception by putting it at a height of, say, 20 feet?
Higher is better. Just make sure the antenna is properly made for the frequency you desire, or in the middle of a range that you desire.
Thanks For Watching! Be sure to rate thumbs up, and share.
electronicsNmore
Thanks. A thumbs up for that answer!
What's the full length from tip to tip if you want to cover the FM radio band 88 - 108mhz?
Design it for 98 mhz.
Give me a break, I have been using a split coax dipole for years. No need for his design, Just split the sheath from the outer casing peel it away, discard, Then with a small screwdriver open the braided wire and seperate the shield and pull the center conductor through the braid. tack to a wall on both ends. no need to measure anything,Mine is 4 ft long on each end with enough left to attach to the TV.
Jason K If you don't like the design, or are too lazy to make something the right way, then don't use it. :-)
Read any article from anyone who makes fm antennas.😂😂 The length is very critical. It's extremely important to maximize the signal. Only an amateur with very little knowledge would say otherwise. The guy in this video is correct, and your insult is insulting yourself.
Finally got that .exe running in a Win 7 virtual machine. Hoping to build this today or tomorrow to get better reception from a local radio station that doesn't transmit with very much power.
Two things I'm still confused about:
1) The program features a list of very specific types of cable (e.g. RG-8 vs RG-8x vs RG-8 FOAM), and also shows the feedline as 50Ω. What effect can I expect from using a 75Ω coax? (Impedance still confuses the heck out of me).
2) Given that the shielding of the feedline is tied directly into the antenna, doesn't that mean the feedline is no longer shielded, and therefore its length should also be calculated?
Thanks to anyone who can help.
Please help me, I don't understand how to use the feet to Inch or Meter to Cm button in the application. Should i understood it by your help, I will be starting to cut the edges of the coax for a specific frequency. Thanks
If you use metric where you live, then just cinput the desired frequency, choose the correct coax wire, then click the Meter/cm button to give you all the dimensions in metric. Very easy.
Thanks For Watching!
Why do you say to make sure that the coaxial cable for the antenna has copper braiding, that is, a copper shield? If the braiding is steel wire, then that won't work?
You can only solder copper shielding.
@@electronicsNmore Not so, there is no problem soldering steel wire. Really I prefer copper, but by mistake I got some steel stranded hook-up wire which I solder all the time to copper foil or to a steel terminal. The solder that I'm using in doing that is 60/40 tin/ lead.
Some coaxial cable that I have on hand has a braided steel shield and I would think that steel is more common than copper. I could be wrong about that as I work very little with coaxial cable.
@@petel2869 I was talking about aluminum.
it worked
I tried and tried and could not find where I could buy copper braid coaxial cable.
I had no luck with Amazon, Ebay, the Radio Shack that was open, Target, Best Buy.
Any ideas?
---- Will the coax with steel braiding suffice as a dipole antenna?
I learned that RG58 and RG8 correspond to 50 ohm and...
-----------------------RG59 and RG6 are 75 ohm.
Thanks
+David Barth
If you cannot find copper shielded coax, then use the readily available aluminum braided type. Since you will not be able to solder the aluminum braiding, just use "uninsulated butt crimp splices". You can buy them on Ebay fairly cheap. Just make sure the I.D. of the butt splice is large enough for the braid and center conductor. Slide it over, then crimp.
rg58 and 8 have copper braid
I didnt understood about the length. Which it should be for each part? How could I calculate it?
Link in the video description area.
The math is fairly simple. Wavelengths (in feet): Quarter- 234, Half - 468, Full- 936. You can do one-eighth and so forth but start with Quarter, Half, and Full until you get use to making them and understand when to use which for particular application. Typically Half is ideal for reception and size. Here is formula..... Wavelength (in feet) = 234 / frequency. Now multiply result by twelve (12 inches) to know how many inches it is. The formula is example of quarter wavelength so substitute that number for however long you what antenna or maximum size that can be used based on available area where antenna will be installed. The antenna is video is shaped like a dipole antenna but functions like a loop antenna. The shape of antenna will have an effect on bandwidth and interference (long story short). Google "Radio Operators Handbook" (MCRP 3-40.3B / FMFM 3-36) it should be first result. This will get you going on understanding antennas and radio waves. These "tight circles" are sometimes referred to as "loading coils" and can be used at the base of an antenna to reduce the overall length above the coil if there is very limited space or discretion is desired.
it is a folded dipole.... cut for the band ...
probably the impedance may be over 200 ohms but for receiving its ok. as a compromise 5 minute quick set up antenna
+Teletenna Tech
Whatever it is, it certainly works well. Thanks For Watching
thank you !
i just used an audio cable and plugged it in :]
I want to make this but the calculator site is not working
+1
@@satamototo Yea Im looking for the math too Can anyone help ?
looking to make a transmitting antenna - any thoughts?
this will work for basic transmitting . Most require 50 ohm coax and many are listed on the program. Al ve3sqb
Super
I'm just drunk and want the radio too work !!!
I'm still drunk, and made mine work with copper and coax..... whiskey down. bitches
Mark Eldridge Best Comment Ever
Same here
Didn't understand a word. How are we supposed to know what's behind all that plastic & insulation?
What are you talking about? I just watched the video again. It was very clear what I said. You must not be familiar with coax. I also included a link in the video description area which shows IN DETAIL the connections. I suspect you did not go to that link. No one else complained.
:)
How is this a folded dipole? Looks like regular dipole.
Thanks, man!
Glad you enjoyed the video! Be sure to check out my extensive video playlists for other great videos of interest to you, rate thumbs up, and share my channel with others.
I'd say my attempt at this slightly increased clarity on local FM Radio Stations but I still can't gain clarity from distant radio stations.
Should be able to. Make sure it was designed for the MIDDLE of the FM band, and placed high up on your wall behind furniture. Keep the top element horizontal. Thanks for watching!
@@electronicsNmore Hey, thanks for posting a comment to mine. I am actually shooting for FM Radio frequencies between 100MHZ to 106MHZ that are just under 75 Miles / 120km away, with a large lake and no mountains in between. Distant stations sound better with Antenna horizontally BUT IT SEEMS SENSITIVE TO DIRECTION on the horizontal plain. It's on my roof 26 feet off the ground so Maybe it's Likely that my lengths are not right.
The link to your calculator doesn't get me to that software; I had to find something else and I'm not sure lengths are right; can you give me exact lengths I need?
Does the coax shielding have to be copper? Why?
Easy to solder.
Work? For what Easier just to buy one
will this work on an am-fm car stereo
It should, or you can always make a FM stereo dipole antenna using 18-20ga speaker wire
Where is the link for the demensions?
Video description area should be a link.
@@electronicsNmore Site link is gone !!!
i am from Bangladesh. I need a fm radio receiving antenna (dipole antena)
will be sent
@@bijankumardas4153 can you sent me?
my radio anteena has only one wire so i can connect only one wear but the Coax Antenna has two wires
please help me
The center wire is the antenna. The braided wire is ground
The braid does not need to be part of antenna. The purpose of this on televisions is to receive the same RF that the center conductor receives so stray RF waves do not induce noise on signal line. The braid would induce the same RF and thus reduce interference as the signal traveling down line is the same (long story short [but different phase]).
were can you buy one of theses ?
You have to make one. This type of antenna is not common, but it certainly does work well.
Thanks For Watching!
To pass symétric to asymetric you need anything other as a simple solded cable. Sorry for my english!
Sodder? What is sodder? I know about solder
Ah, another instigating Brit.
And Australians too.
Count the number of syllables in a word, then count them as you say them, are they still the same?
It's best if you can read and write to do that test though.
English is English, American is American English
More fun:
i as in ink? or i as in eye?
Ni[nk]kon and Ne[ye]kon
Great fun, and very, very powerful is the 'word' so powerful it used to be called spelling, casting spells is writing.... and a spell book is a dictionary. Glad they changed the 'spelling' lessons to 'English' lessons in the early 70's here in the UK :D
Though we better be careful, a wizard may cast a spell on us.
I believe it is US American for solder. They don't always get the letters or pronunciation right.
sol·derDictionary result for solder
/ˈsädər/
noun
1.
a low-melting alloy, especially one based on lead and tin or (for higher temperatures) on brass or silver, used for joining less fusible metals.
"remove the fitting using a blowtorch to melt the solder"
verb
1.
join with solder.
"the wires to this clip are soldered to the circuit board"
This is not a 'folded' aerial, just a straight single dipole which would give an impedance of around 75 ohms, a folded one would give you an impedance of 300 ohms.
The famous Bazooka antenna
Yes, and it works very well when made properly. Thanks for watching!
Antennas won't receive anything without a tuning circuit, look up resonant frequencies.
What are you talking about? LOL
Thanks for your sharing. However, Best would be show exact step-by-step of construction for one example say 99 MHz. Also, The website calculator page is confusing. Says add 2 ft. To calculation but the talks about extra 6” on each side. Which is only 1 ft. Total. I think this is why you got so many thumbs down. You could really do a lot more w this.
The thumbs down were from people that either didn't like the design of the antenna, couldn't use the Windows OS antenna calculator program link I provided, or Trolls. The antenna works well, and I thought the instructions were fairly easy to understand. If a person had trouble making the antenna, then all they had to do was ask a simple question in the comment area, if they clicked "Thumbs Down", that was a confirmation of their stupidity. I'll take a closer look at the link. Thanks for watching!
electronicsNmore I have no doubt the antennae works well - which is why I was hoping you could provide better instructions on how to build. Even if you don’t want to take the time to do a video, photographs every step of the way would be helpful. Steps: doing the calculation for typical coax such as rg -59, rg-6; adding additional length; cutting and stripping the wire, creating the plastic centerpiece, connecting the center feed to the two legs, doing the soldering, etc.
It's fairly straight forward. Download the program, enter the frequency desired, then use the images as a guide. For best results use braided copper as the shielding.
Bazooka is another name. Correct.
You are 100% incorrect. This IS a folded dipole. Look up what a folded dipole looks like. LOL. This version does not have a wide space between the radiating loop.
For fm radio?
Yes
Why is it that you electronics people cannot communicate any Info to anybody who has no fair knowledge on the subject ALREADY
Because the part of the brain required for successful communication among humans is sacrificed to understand this shit.
What were you having issues with? Also the answer is probably because you should have some kind of base level that you’ve gone and research or looked at before getting to this point.
Yep...electronics people .. they from a different world... really... they think everyone understands what are they saying...
But apply that to literally any vocation 🤷♂️
I think antenna support ends not ...
this is just far out , thank you :) QC
we call that a double bazooka antenna in amateur radio operators lingo
anthony christian Jaen di un suo riscontro nella mia mente che non è una cosa che mi sono dimenticato di chiederti una cortesia di una persona che non è una cosa che mi sono accorto solo per la prima volta in cui si trova a pochi passi da Piazza San Marco di un mio amico ha fatto piacere di averti conosciuto come il tuo numero di telefono e telefonino cellulare che si chiama così come è andata bene il
o
All i can see in this video is 3 wires
as arms 2 wires. 1 radiating element, and a feed line. What were you expecting to see? Did you click the link in the video description area?
And how am I making dis?
Sodder?
Yes, that's what Americans call it.
Ok, I see, hehe. I implemented your solution, and it's working ok till now. The coax travels about 4,5meters from the fm tuner, goes through the wall and the "T" hangs about 2meteres high on the outside wall, attached to it. The signal improved significantly, but still isn't perfect. Any ideas? I calculated the distance between solder points. Thanks in advance.
1K Like! I am going to build!!
Great to hear Justin! It works well when properly made. Be sure to check out my extensive video playlists below, rate thumbs up, and share the video link on social networking websites. Thanks
ua-cam.com/users/electronicsnmoreplaylists
I finished it. It works great and I have it mounted vertically behind my TV. It was a little tricky to do because the coax that I found had foil shielded thin delicate copper wire. I built it for 98MHz and now I can pick up stations that I could not before.
haha, i'm a moron, i just had to click on "more" to get the link.
All good except I was left wondering what a sodder point was. Ok, it is an accent thing and he was trying to pronounce solder, but really sodder!
Stop telling Americans how to pronounce words. It's very rude, and shows how ungrateful you are. If it wasn't for American lives and firepower, the UK would be part of Nazi Germany today, that's a fact.
Nice info but not much good if you don't put the measurements in. I just need a simple FM antenna and I am not a radio head.
You need to use the calculator provided. Enter the frequency desired, and presto!
is it possible to amplify home made antennas anyone respond
Yes. you can connect a signal amplifier between the antenna and radio.
bit.ly/2cTgtFj
It depends on antenna. Most will be good with electric amplifier attached inline between tv and antenna. However, you can improve reception and reliability of signal by coiling the coax in tight circles at the end near the antenna. For example, close to where coax meets antenna, coil the coax in three inch circles with a total of four full turns, and then secure those coils with electrical tape so they do not unravel. Experiment with coils to identify which works best for your area and antenna. This is the easy answer as I am not going to get into mathematical formulas. Essentially what the coils do is act as a filter by creating a field that consumes interference but also increases line impedance (which can be bad but can also improve signal reliability). This is why you experiment with different ratios of windings and size of winding circles. At the end of the day there is a reason why it is called radio theory and not fact.