Glad it also worked well for you. Be sure to check out my other videos, share, and rate a Thumbs Up. Thanks!

Glad it helped! Be sure to rate thumbs up, consider subscribing if you like a wide range of helpful and informative videos, and look over my extensive video playlists below for many other videos of interest to you. Taking one minute to share a link to my channel with others on social networking sites would be greatly appreciated. Thank you kzfaq.infoplaylists

this calc gives about 153cm for 98mhz.

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

+jmanatee Glad my video was able to help you. Please share my videos with others and rate Thumbs Up. Thanks!

Glad you like them! They do work well when properly made. Thanks for watching! Be sure to rate thumbs up.

Yes, when properly made, they work very well. Thanks for watching! Be sure to rate thumbs up, check out my other videos, and share.

ok, take 2. Trimmed each end and now get low of 60ohm and high of 107 at 99mhz. Problably as good as it gets

Great to hear!

Thanks Al. I always make sure to send viewers to the source. Sometimes the links vanish, and I have to look for other links.

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.

Choose the middle of the band.

+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.

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.

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!

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).

Whatever works! :-) Thanks for watching

Design it for 98 mhz.

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).

+Kketansa Art No. Just make (1) antenna for the center of the band you're using.(98mhz) should be fine

electronicsNmore Thank 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

I think others have tried that and determined that horizontal is best. Thanks for watching!

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!

+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

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.

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.

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.

Look under the video in the "About" section. Don't forget to share, and rate a thumbs up. Thanks For Watching!

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.

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.

+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.

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..

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.

It should, or you can always make a FM stereo dipole antenna using 18-20ga speaker wire

+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.

this will work for basic transmitting . Most require 50 ohm coax and many are listed on the program. Al ve3sqb

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]).

You have to make one. This type of antenna is not common, but it certainly does work well. Thanks For Watching!

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 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.

:)

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.

will be sent

@@bijankumardas4153 can you sent me?

I'm still drunk, and made mine work with copper and coax..... whiskey down. bitches

Mark Eldridge Best Comment Ever

Same here

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?

Easy to solder.

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.

+Teletenna Tech Whatever it is, it certainly works well. Thanks For Watching

thank you !

+1

@@satamototo Yea Im looking for the math too Can anyone help ?

Video description area should be a link.

@@electronicsNmore Site link is gone !!!

Yes

What are you talking about? LOL

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.

Yes, and it works very well when made properly. Thanks for watching!

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.

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

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"

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?

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.

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

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 kzfaq.infoplaylists

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.

You need to use the calculator provided. Enter the frequency desired, and presto!

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 🤷‍♂️

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.

Yes, I think it's also known by that name. Thanks for watching!