I love how you demonstrate this with no words. Very clear. I'm regularly confused by many construction videos where the presenter says: "now we're going to {unfamiliar expression here}…" before cutting the video to show the thing AFTER they did the unfamiliar procedure, but didn't show me how. BUT I DON'T KNOW HOW YOU DO THE THING YOU JUST DID!! 😭 I understood you perfectly 😁👍🏻
I prefer to not use soldered connection for wires that might move around due to wind. They tend to break after a while. To prevent this a clamped connection is better. But I hope you won't have this problem. That coil looks great. Professional work! 👍
Paul, neat build for your coil and then figuring out your 80m wire length. I learned that it is much better to fold back to tweak an antenna to reach the residence that I want vs. cutting too much. You can always cut the wire once you reach the right length.
Hi Paul… Nice to see someone out there taking the time to experiment and show others what can be done - we learn by doing! Thank you for taking the time making the effort and showing what can be done with a little imagination! WELL DONE SIR!! 👏🏻 🙏 👍 Hope to hear you on 40/80 sometime soon… 73
Paul you could add self amalgamating tape to the coil without adding to much weight if you think environmental conditions need it. Good video plenty of technical content. Worth a try. Regards
Hello Paul, you really showed how it works. I did it the same way. My coil looks a little different, but in principle there is no difference. But I don't cut the wire around the resonance anymore, I just fold it. It's less of a thrill, but it works great :-)
Very solid build. I would have run the wire to within about 2m of the pole (the longer the better) and then reduced windings on the loading coil. You can do that by shorting windings. Scrape the enamel off one winding at a time and form short bridge with a dab of solder. Repeat until you get very close. Then perhaps fold the wire to bring the dip to where you want it. Less inductance (less windings) will widen the bandwidth and thus improve your SWR at the band limits. I don’t have the space at my fixed QTH to put up an 80m EFHW but the above method is how I got my 40m tuned for maximum SWR width in band.
Just a though, when you got closer to your desired frequency, folding the wire back rather than cutting may be a better option in hindsight. Great video. Thanks
Good video. I do lenght adjustment so that fold extra lenght backwards and hold it in place to antenna wire with straps. That allows you go back and forth with wire lenght. When final lenght achieved I cut that extra tail off and secure folding point permanent. That way you dont make your wire too short and need new wire. 😊
Thanks for the excellent build video. A TIP for you: As you found out the hard way you can cut too much. there is no need to cut. If you fold the extra wire *tightly* on itself, it is like a virtual cut. Try it. I am always astonished at the common ham advise to cut the wire to resonance, and people don't advise wrapping the extra length to achieve the virtual cut. 73
A tip... I would use a pulley at the poll end and a spring at the end of the rope. this will make adjusting the antenna SWR and give the wire adjustable..
Hi, thanks for the video. It's better to use an isolator between the antenna wire and the rope. When the rope gets wet, it will extend the antenne wire! You could fixated the coil with 4 wire straps so that the coil does not loosely hangs around the wire.
@@OM0ET Hi, I did some more thinking about your coil. I see an issue. The used isolator inside the coil, but in particular the metal snap hooks will have a major impact on the coil characteristics. I'm pretty sure you will measure totally different values in this configuration then on the bare coil. Coils are extremely sensitive.
one suggestion I would make is to not cut the wire when you are close to resonance, but leave it a foot or so longer and twist it around the antenna wire. It will not affect the swr and you then have the option of lengthening it if necessary to fine tune. Once you have confirmed the length then you can cut if you desire, I tend to leave a bit for future adjustments if necessary. As you discovered, once the wire is cut there is no going back.
Enjoyed watching what all us hams do! Messing around in the backyard with antenna's, but some of us getting to old to do it Paul. The trap looks really good and a great job! I thought you should have a insulator on the end where you have the rope connected too? Hope to get out in the backyard again when the weather gets better to play antennas, just as you have. Great to work you on 20mtrs the other day, shame about the qsb that spoilt the chat, hope to catch you again soon . keep up with the video's there great! cheers colin.
Nice work - good looking. Idea: Do not cut off wire when fine tuning, but just bend wire like a small U and fold back antenna end - and tighten somehow. Then you can adjust back again. Also handy if you e.g. change location or antenna hight, then you can fine tune again - and again ...... 🙂73 de OZ8MS
Very nice bit of work Paul, store bought wouldn't come any nicer. A few thoughts...there seems to be a narrow range of 'European' frequencies that are of interest to you, and so the loading coil being large and of relatively high Q reduces you're useful bandwidth considerably. Considering the length of the antenna, I'm suprised it's so tight. You might also try to wind a new matching xfrmer on a Fair Rite core 2643251002, auto transformer style, and with no crossover... 56:1, just an extra turn (15) and you might just find the match to be much better, perhaps pulling the VSWR down to near 1:1... Doing this I went from 1:162 down to 1:104 on the NanoVna...as always YMMV... Richard VA7AA
This antenna was made mainly for 40m band and after this mod I found the same SWR values as before this mod. 1:1 in the PHONE section between 7.100-7.200 MHz which is great! ;)
I see a lot of people asking about the coil. I see that you have the 40 meter antenna but making an 80 meter antenna would require double the garden size. Presuming you don't have enough room you decided to make a loading coil. The chinese loading coils that they put in the JPC-12 antennas can be had cheaply and they have a slider that ahorts them at different inductance values. I wonder if one of those would have the amount of inductance loading you need, and i wonder if it might have worked in your application. It allows the JPC-12 whip to run at 20 and 40 meters. Supposedly with a second one you can run 80. In any case, good video. I was unsure what you were going to be doing....i thought you might add a capacator to make a trap so that you could make a trap antenna. One or two slides in the beginning would have spared my weak brain much confusion.
Nice… I made one as well. I used a smaller diameter form. I kind of regret it since it ended up being almost 12” long to get the required inductance haha.
If you are testing lengths, you can just adjust the wire in the clamp, instead of cutting it. That way, if it get too short(for some reason :-) ), you can just let some more out of the clamp. Good job.
Building a field portable use 80-10 EFHW right now. Mt current EFHW at my QTH does not utilize your version of strain relief. The loading coil that is used to widen the higher bands ( 10mtrs ) puts the strain on the PVC tube. I like your version much more. For the cost of a bit more hardware and time... This seems to be well worth it. Thank you... 😊 73 de KF4LBG Larry
Paul, this is Markus - db9pz - talking to you. We met a few month ago, when you testet you 'QRP'-rig, I was the first station, also QRP, speaking to you, ... ! I enjoyed that QSO very much, ... ! Thanks again, dear Paul. Please take more care of the 'size' of wire and cord! The 'clamps' and the 'closing-keys', will not fit for the wire you need. Too much 'room' in between! And 'solder' alone, can have a 'solid flow', so that it will not fix the wire permanently. It will work and 'flow', milimeter for milimeter, out of the soldered ring... ! A problem that every electrician in the world will know, ... ! Also, why don 't you crimp the fitings for the wire not first, and then solder it for safety reasons? Also , you can make some shrinking-tube, (best with heat-clue inside) over all connetions to 'weather-proof' them. You later told about it in your video. Sorry, ... ! 73/72 de Markus - db9pz (JN39fq - 5km/3miles east of LX))
Hello Markus! Thank you very much for your comment and advice! Yes, next time would be maybe better also crimp them before soldering. ;) Thanks for watching this video and for QSO we had! 73
I trim my overall wire length using two iPhones using the Video Chat method. #1 iPhone is in the shack pointed at my VNA, which is connected to the RF cable that is normally connected to the back of my radio. I then take #2 iPhone to the end of the wire and trim as needed. It something you can do by yourself.
The built in ATU will tune the 3:1 down to perfect but THEN you can use that tuning and turn the VFO further to beyond the perfect match. For example, dial to the furthest point your radio will tune, get the perfect ATU match, then since it is now 1:1 you can turn the VFO further to say 2:1 and TX just fine. It is the equivalent to the 5:1 point but tuned down to 2:1. You don't have to stick to the sub 3:1 bandwidth.
Leave the metal caribiners out and use a larger plastic insolator in sted, this leaves out the metal that may change the coils inductance and affect the coils Q. ?
Self amalgamation tape will deteriorate eventually. I have started using Denso tape. It will last better and is totally protective. Best of all it’s cheaper. 73’s John GM0MST
I quite like the look of this antenna as it appears to be not too difficult to build. How did you arrive at the turns of winding over the diameter of form? Is this one of the online calculators and if so which one? I have tried a few and it always appears that there is a capacitor of some sort involved in parallel with the coil. I (Canadian) have never seen the type of fitting you used and would probably be winding a coil over a regular 2" (50mm) PVC tube, I would expect that would change the turns of the coil. A couple of things. It's been my experience that the self amalgamating tape (splicing tape) is not UV stable and requires a layer of electrical tape over it. I have used it over PL259s and it deteriorated in the sun if not covered. I am not sure but I don't know how UV stable the enamel coating on the wire is either, but I have seen a few traps built out of it so it might be fine. It looks like another trap and you would be able to build a 160m extension. I have been looking for an antenna to build so I can get on the air again. A tree ate my 4 band TET beam and tower a few years ago and I'm working to get that up and running again (TH7 this time and the tower is a piece of crap). Anyway great build and 73 de Gil ve7bul
I never cut the wire when close to the wanted frequency. I bend and fold the wire back, take a look at the chart. If to short I make it longer with the bend over piece. When OK I then will cut the wire. I like your videos. 73 Phil ON4VP
Here's a tip. NEVER leave only an inch folded back when you make your cut. Fold 6 inches back every cut until you get on frequency, then snip the remainder an inch at a time, ...if you really want to. And actually, the folded back section is a cancelling section, so the effective length is to the fold. You can usually snip away at the fold back section to make it short and neat without affecting SWR too much. That 'Hail Mary' approach to length snipping is just asking for trouble, :D ..but entertaining to watch someone else doing it.
Would it be beneficial to cover the windings of your coil with house paint? That would protect the insulating coating from the sun, so it doesn't short out.
Nice build. I was just wondering whether the steel brackets inside the coil will have an effect on your inductance. And another one is.... will a lower value inductance coil with a bit longer extension wire give a wider bandwidth on 80m.?
Hi, and what about the tuning on other upper bands? Sometimes the use of a serial capacitor on the lower band wire part can reduce the missmatch on upper bands.
@@sergiocavazos8963 , a good Value is 100...120µH.The more inductance you use, the shorter the wire must be after the coil. So it's better to keep the inductance as small as possible if you have enough space for a longer wire after the coil. If the inductance is small, e.g. B. 80µH then the antenna is also a bit broader band. 73 de df8ru
Regarding the calculator it should be around 160-170uH. This is the reason why is the wire so short only 1.43m long and antenna so narrowband. 67turns of 1mm enameled wire winded on 55mm former.
Hi Paul, I posted above how you can short out turns on the coil to reduce inductance and therefore gain bandwidth. You want to lengthen the loaded 80m part of your antenna as much as is practical. Good luck!
Hi Paul. Did you measure your coil when you finished the winding? I made mine on a 25mm plastic pipe, and when finished, I read 108.5 micro Henries. It is longer than your coil, but the inductance is probably close to the same. Nice project!
Hi paul i am trying to copy your design the pipe you used for the body was that a 50 mm straight coupler and what length of the coupler did you use plz 73s buddy
Are you sure?? :D www.google.sk/search?q=1430mm+to+m&newwindow=1&sca_esv=600263652&sxsrf=ACQVn08UwEfpKEHs4QDMx4cz6NgZI4gmgw%3A1705863143693&source=hp&ei=52etZd3xJvaLxc8PyJCt-A4&iflsig=ANes7DEAAAAAZa11913Yn1lAqyUifOz4V2kB9v2zV1wY&udm=&ved=0ahUKEwidgdm1k--DAxX2RfEDHUhIC-8Q4dUDCA0&uact=5&oq=1430mm+to+m&gs_lp=Egdnd3Mtd2l6IgsxNDMwbW0gdG8gbTIGEAAYFhgeMggQABgWGB4YD0jDKVDaBFj8JHABeACQAQCYAbsBoAHzCKoBAzguM7gBA8gBAPgBAagCCsICBxAjGOoCGCfCAg0QLhjHARivARjqAhgnwgIEECMYJ8ICERAuGIMBGNQCGLEDGIAEGIoFwgIIEAAYgAQYsQPCAg4QLhiDARixAxiABBiKBcICCBAuGIAEGLEDwgIOEAAYgAQYigUYsQMYgwHCAgUQABiABMICCxAAGIAEGLEDGIMBwgIIEAAYgAQYywHCAgoQABiABBjLARgKwgIGEAAYHhgNwgIEEAAYHsICBhAAGB4YDw&sclient=gws-wiz
You could put a piece of a "pool noodle" inside the coil so that the insulator does not dangle inside and always stays at the same distance from the coil.
Hi dear Gil! I think that the outher diameter was 55mm. Thank you for visiting my channel, I am very honored by your visit! You are doing very good job! Best 73 Paul :)
You do not need another wire if you cut too much, just solder thin wire, end of antenna have extreme low current and maximum voltage. When I trim antenna wire I never cut end of wire just wrap around , no need to cut. So if you need lower frequency just release wire. You already have bunch of wire. But not everybody.
I believe he wanted to replace that end because it wasn't as pretty as the new "shiny" wire after all that work! 😂 I mean he took all that time to point out how he "hoped" he didn't cut it too short lol. 👍
Everyone would criticism him too for the "imperfect" job. I thought this too, but why not cut another piece of wire 4cm longer then you had before, simple. 😊
I always try to make simple and cheap trimming. Last 10 inch of wire antenna not need to be straight horizontaly like rest wire even not need to be same thick wire. Short section "sacrifice" tin wire pointed down woud not make any difference and easy to trimm. If you cut too much replace with new tin wire and continue. End of wire antenna do not be straihgt at all. Concept is already many time proven and work.
Paul. I am going to put this antenna together using the 40m EFHW as the starting point (I have limited run distance). Would you please confirm my understanding of the rig? After the 49:1 UnUn, a 19+M wire, then the 110mh loading coil and then about 1.5 M wire, cutting this last wire to length to control SWR. Thanks for your help, N7DKE
As I was checking only the 40M band, which is the band what this antenna was made for, there is no significant change in SWR. Still 1:1 in 40M phone section.
in future, do not cut the wire when you are close, fold it back and wrap it around the antenna length. this will allow you the adjust it back to a longer length if you guess too short.
I would have wrapped kapton tape over the winding. That coil is a nice place for birds to land. Over time the enamel will be gone without any protection. Problem or not, don't know 😀.. 73 OH7WV
Yes, I never understood why people cut the wire. Folding works just fine, I have been building antennas over 50 years now and learned that many years ago.
Nice video for 80m band coils home brew. You are sharing a good ideas for making coils. Adjust a SWR is normally takes a time to cut and try Ha Ha... de HL1SB
Instead of cutting the wire, you could have actually just folded the wire over multiple times to make it think it was shorter! The end o9f it being folder over doesn't change it's radiation pattern! \
I love how you demonstrate this with no words. Very clear.
I'm regularly confused by many construction videos where the presenter says: "now we're going to {unfamiliar expression here}…" before cutting the video to show the thing AFTER they did the unfamiliar procedure, but didn't show me how. BUT I DON'T KNOW HOW YOU DO THE THING YOU JUST DID!! 😭
I understood you perfectly 😁👍🏻
I prefer to not use soldered connection for wires that might move around due to wind. They tend to break after a while. To prevent this a clamped connection is better. But I hope you won't have this problem. That coil looks great. Professional work! 👍
Thanks :)
I prefer a comination of both. First clamp and solder afterwards. Good connection and mechanically strong
Sir your attention to detail and application of easy to find hardware is some great stuff.
Paul, neat build for your coil and then figuring out your 80m wire length. I learned that it is much better to fold back to tweak an antenna to reach the residence that I want vs. cutting too much. You can always cut the wire once you reach the right length.
Hi Paul… Nice to see someone out there taking the time to experiment and show others what can be done - we learn by doing! Thank you for taking the time making the effort and showing what can be done with a little imagination! WELL DONE SIR!! 👏🏻 🙏 👍 Hope to hear you on 40/80 sometime soon… 73
Thank you very much! 🙂👍
Paul you could add self amalgamating tape to the coil without adding to much weight if you think environmental conditions need it. Good video plenty of technical content. Worth a try. Regards
Hello Paul, you really showed how it works. I did it the same way. My coil looks a little different, but in principle there is no difference. But I don't cut the wire around the resonance anymore, I just fold it. It's less of a thrill, but it works great :-)
Thanks! Yes, this is an option too :)
Very solid build.
I would have run the wire to within about 2m of the pole (the longer the better) and then reduced windings on the loading coil.
You can do that by shorting windings. Scrape the enamel off one winding at a time and form short bridge with a dab of solder. Repeat until you get very close. Then perhaps fold the wire to bring the dip to where you want it.
Less inductance (less windings) will widen the bandwidth and thus improve your SWR at the band limits.
I don’t have the space at my fixed QTH to put up an 80m EFHW but the above method is how I got my 40m tuned for maximum SWR width in band.
Sounds like good advice.
That’s some good advice . These little gems are what ham radio community is all about. Thanks.
Very Cool project and your loading coil is beautiful, thanks for sharing.
I love messing with antennas too.
Jan 2024: A waste-pipe coupling I have not seen in North America but that looks like the perfect form for such a coil.
Just a though, when you got closer to your desired frequency, folding the wire back rather than cutting may be a better option in hindsight. Great video. Thanks
Or maybe another option might be to test first using cheap wire?
Thankyou for the build video ,you did a brilliant job.
Hey Paul, great video. Here in the United States, we call that plastic insulator a "dog bone."
-K5SFC
Thanks for the great construction techniques. You are a superb technician.
Good video. I do lenght adjustment so that fold extra lenght backwards and hold it in place to antenna wire with straps. That allows you go back and forth with wire lenght. When final lenght achieved I cut that extra tail off and secure folding point permanent. That way you dont make your wire too short and need new wire. 😊
Thanks for the excellent build video. A TIP for you: As you found out the hard way you can cut too much. there is no need to cut. If you fold the extra wire *tightly* on itself, it is like a virtual cut. Try it. I am always astonished at the common ham advise to cut the wire to resonance, and people don't advise wrapping the extra length to achieve the virtual cut. 73
Very cool video 😊 i like your channel! 80m and 160m antenna Videos are interesting
73
friend. piease show me the soldering iron. very interesting. this is the one in the video ?! thank you
👍 Good work Paul and thanks for video. I will keep a look out for you on 80m.
A tip... I would use a pulley at the poll end and a spring at the end of the rope. this will make adjusting the antenna SWR and give the wire adjustable..
Hi, thanks for the video. It's better to use an isolator between the antenna wire and the rope. When the rope gets wet, it will extend the antenne wire! You could fixated the coil with 4 wire straps so that the coil does not loosely hangs around the wire.
Good idea, I will install an isolator 👍
@@OM0ET Hi, I did some more thinking about your coil. I see an issue. The used isolator inside the coil, but in particular the metal snap hooks will have a major impact on the coil characteristics. I'm pretty sure you will measure totally different values in this configuration then on the bare coil. Coils are extremely sensitive.
one suggestion I would make is to not cut the wire when you are close to resonance, but leave it a foot or so longer and twist it around the antenna wire. It will not affect the swr and you then have the option of lengthening it if necessary to fine tune. Once you have confirmed the length then you can cut if you desire, I tend to leave a bit for future adjustments if necessary. As you discovered, once the wire is cut there is no going back.
Enjoyed watching what all us hams do! Messing around in the backyard with antenna's, but some of us getting to old to do it Paul. The trap looks really good and a great job! I thought you should have a insulator on the end where you have the rope connected too? Hope to get out in the backyard again when the weather gets better to play antennas, just as you have. Great to work you on 20mtrs the other day, shame about the qsb that spoilt the chat, hope to catch you again soon . keep up with the video's there great! cheers colin.
Nice work - good looking.
Idea: Do not cut off wire when fine tuning, but just bend wire like a small U and fold back antenna end - and tighten somehow.
Then you can adjust back again.
Also handy if you e.g. change location or antenna hight, then you can fine tune again - and again ...... 🙂73 de OZ8MS
Very professional Paul. Great work. 73
Verry nice!
Thank you for this Video 👍👍
Very Helpful especially with your used fittings many thanks GM4NNC
Very nice bit of work Paul, store bought wouldn't come any nicer. A few thoughts...there seems to be a narrow range of 'European' frequencies that are of interest to you, and so the loading coil being large and of relatively high Q reduces you're useful bandwidth considerably. Considering the length of the antenna, I'm suprised it's so tight. You might also try to wind a new matching xfrmer on a Fair Rite core 2643251002, auto transformer style, and with no crossover... 56:1, just an extra turn (15) and you might just find the match to be much better, perhaps pulling the VSWR down to near 1:1... Doing this I went from 1:162 down to 1:104 on the NanoVna...as always YMMV... Richard VA7AA
This was a great video. Thanks for sharing this with us. 🤙
At 1:10 if you added a nut to the bolt 1st before anything else just to act as a spacer it would make tightening things up later on much easier.
Your coil looks like it was factory made.👏🇨🇮
I would have like to see the readings of the other bands, eg 40m and 20m in terms of swr / freq. Thanks still a great video as always.
This antenna was made mainly for 40m band and after this mod I found the same SWR values as before this mod. 1:1 in the PHONE section between 7.100-7.200 MHz which is great! ;)
Very well engineered.
Wie sieht ein Lötkolben aus?! Sie können es auch sehen, herstellen oder kaufen, sehr interessant...?!
I see a lot of people asking about the coil. I see that you have the 40 meter antenna but making an 80 meter antenna would require double the garden size. Presuming you don't have enough room you decided to make a loading coil.
The chinese loading coils that they put in the JPC-12 antennas can be had cheaply and they have a slider that ahorts them at different inductance values.
I wonder if one of those would have the amount of inductance loading you need, and i wonder if it might have worked in your application. It allows the JPC-12 whip to run at 20 and 40 meters. Supposedly with a second one you can run 80.
In any case, good video. I was unsure what you were going to be doing....i thought you might add a capacator to make a trap so that you could make a trap antenna. One or two slides in the beginning would have spared my weak brain much confusion.
Nice… I made one as well. I used a smaller diameter form. I kind of regret it since it ended up being almost 12” long to get the required inductance haha.
If you are testing lengths, you can just adjust the wire in the clamp, instead of cutting it. That way, if it get too short(for some reason :-) ), you can just let some more out of the clamp. Good job.
Building a field portable use 80-10 EFHW right now.
Mt current EFHW at my QTH does not utilize your version of strain relief. The loading coil that is used to widen the higher bands ( 10mtrs ) puts the strain on the PVC tube. I like your version much more.
For the cost of a bit more hardware and time... This seems to be well worth it.
Thank you... 😊
73 de KF4LBG
Larry
Paul,
this is Markus - db9pz - talking to you.
We met a few month ago, when you testet you 'QRP'-rig, I was the first station, also QRP, speaking to you, ... ! I enjoyed that QSO very much, ... ! Thanks again, dear Paul.
Please take more care of the 'size' of wire and cord! The 'clamps' and the 'closing-keys', will not fit for the wire you need. Too much 'room' in between! And 'solder' alone, can have a 'solid flow', so that it will not fix the wire permanently. It will work and 'flow', milimeter for milimeter, out of the soldered ring... !
A problem that every electrician in the world will know, ... !
Also, why don 't you crimp the fitings for the wire not first, and then solder it for safety reasons? Also , you can make some shrinking-tube, (best with heat-clue inside) over all connetions to 'weather-proof' them. You later told about it in your video. Sorry, ... !
73/72 de Markus - db9pz (JN39fq - 5km/3miles east of LX))
Hello Markus! Thank you very much for your comment and advice! Yes, next time would be maybe better also crimp them before soldering. ;) Thanks for watching this video and for QSO we had! 73
I trim my overall wire length using two iPhones using the Video Chat method. #1 iPhone is in the shack pointed at my VNA, which is connected to the RF cable that is normally connected to the back of my radio. I then take #2 iPhone to the end of the wire and trim as needed. It something you can do by yourself.
Very nice work. Thank You 73
The built in ATU will tune the 3:1 down to perfect but THEN you can use that tuning and turn the VFO further to beyond the perfect match. For example, dial to the furthest point your radio will tune, get the perfect ATU match, then since it is now 1:1 you can turn the VFO further to say 2:1 and TX just fine. It is the equivalent to the 5:1 point but tuned down to 2:1. You don't have to stick to the sub 3:1 bandwidth.
Very beautiful Job 💯👌
Leave the metal caribiners out and use a larger plastic insolator in sted, this leaves out the metal that may change the coils inductance and affect the coils Q. ?
Very nice indeed! 👍
Self amalgamation tape will deteriorate eventually. I have started using Denso tape. It will last better and is totally protective. Best of all it’s cheaper. 73’s John GM0MST
I quite like the look of this antenna as it appears to be not too difficult to build. How did you arrive at the turns of winding over the diameter of form? Is this one of the online calculators and if so which one? I have tried a few and it always appears that there is a capacitor of some sort involved in parallel with the coil. I (Canadian) have never seen the type of fitting you used and would probably be winding a coil over a regular 2" (50mm) PVC tube, I would expect that would change the turns of the coil. A couple of things. It's been my experience that the self amalgamating tape (splicing tape) is not UV stable and requires a layer of electrical tape over it. I have used it over PL259s and it deteriorated in the sun if not covered. I am not sure but I don't know how UV stable the enamel coating on the wire is either, but I have seen a few traps built out of it so it might be fine. It looks like another trap and you would be able to build a 160m extension. I have been looking for an antenna to build so I can get on the air again. A tree ate my 4 band TET beam and tower a few years ago and I'm working to get that up and running again (TH7 this time and the tower is a piece of crap). Anyway great build and 73 de Gil ve7bul
Super.!
Very relaxing video 👍
How was your SWR on the other bands? 40, 20, 10 etc? Great Video!
I also wondered if/how that changed the other bands...
What is the mH of this coil? Nicely done!!
I never cut the wire when close to the wanted frequency. I bend and fold the wire back, take a look at the chart. If to short I make it longer with the bend over piece. When OK I then will cut the wire. I like your videos. 73 Phil ON4VP
Here's a tip. NEVER leave only an inch folded back when you make your cut. Fold 6 inches back every cut until you get on frequency, then snip the remainder an inch at a time, ...if you really want to. And actually, the folded back section is a cancelling section, so the effective length is to the fold. You can usually snip away at the fold back section to make it short and neat without affecting SWR too much. That 'Hail Mary' approach to length snipping is just asking for trouble, :D ..but entertaining to watch someone else doing it.
Would it be beneficial to cover the windings of your coil with house paint? That would protect the insulating coating from the sun, so it doesn't short out.
What is the benefit of this antenna for us? Does it strengthen the antenna phone signal?
Nice build. I was just wondering whether the steel brackets inside the coil will have an effect on your inductance.
And another one is.... will a lower value inductance coil with a bit longer extension wire give a wider bandwidth on 80m.?
Hi, and what about the tuning on other upper bands? Sometimes the use of a serial capacitor on the lower band wire part can reduce the missmatch on upper bands.
thanks for providing interesting information on DIY efhw antenna with 80 m extension. What transformer is there? And what core mix?
You are very welcome! 😉👍 Look here: ua-cam.com/video/z-_2aBqcjI8/v-deo.htmlsi=zD5FaFvN-NXqJcdZ
did you measure the coil microhenries value and did the addition of the 80M section change the performance from 10 to 40?
How many micro Henry is the coil and details of the former and length of the extension wire would be help full
yes , please if you have this info post it
@@sergiocavazos8963 , a good Value is 100...120µH.The more inductance you use, the shorter the wire must be after the coil. So it's better to keep the inductance as small as possible if you have enough space for a longer wire after the coil. If the inductance is small, e.g. B. 80µH then the antenna is also a bit broader band. 73 de df8ru
@@Roadrunner48 yes this is true! :)
Regarding the calculator it should be around 160-170uH. This is the reason why is the wire so short only 1.43m long and antenna so narrowband. 67turns of 1mm enameled wire winded on 55mm former.
Hi Paul, I posted above how you can short out turns on the coil to reduce inductance and therefore gain bandwidth.
You want to lengthen the loaded 80m part of your antenna as much as is practical.
Good luck!
Fantastic video...Nice that you left the mistake in... Well done.. M1bsz
Thank you very much for your comment! :)
Can you just fold back the wire to make it shorter rather than cutting ???
Hi Paul. Did you measure your coil when you finished the winding? I made mine on a 25mm plastic pipe, and when finished, I read 108.5 micro Henries. It is longer than your coil, but the inductance is probably close to the same. Nice project!
by the way what inductance did you achieve given your data? Real measurements usually differ from coil inductance calculator given at 66pacific
I didn't had the LC meter at that time.
Hi paul i am trying to copy your design the pipe you used for the body was that a 50 mm straight coupler and what length of the coupler did you use plz 73s buddy
Nice job. I am also working on a new antenna project like the one you built. The mini sweep analyzer looks like what what I "need ". HI HI. 73 Leo k
Hi Leo, this Antenna Analyser is MINI 1300 purchased from Aliexpress :) I like it very much! Good luck with your antenna project!
Thank you for the video. Please note, that you have a typo in your video description. 1430 mm equals 1.43m. Vy 73 Markus
Are you sure?? :D www.google.sk/search?q=1430mm+to+m&newwindow=1&sca_esv=600263652&sxsrf=ACQVn08UwEfpKEHs4QDMx4cz6NgZI4gmgw%3A1705863143693&source=hp&ei=52etZd3xJvaLxc8PyJCt-A4&iflsig=ANes7DEAAAAAZa11913Yn1lAqyUifOz4V2kB9v2zV1wY&udm=&ved=0ahUKEwidgdm1k--DAxX2RfEDHUhIC-8Q4dUDCA0&uact=5&oq=1430mm+to+m&gs_lp=Egdnd3Mtd2l6IgsxNDMwbW0gdG8gbTIGEAAYFhgeMggQABgWGB4YD0jDKVDaBFj8JHABeACQAQCYAbsBoAHzCKoBAzguM7gBA8gBAPgBAagCCsICBxAjGOoCGCfCAg0QLhjHARivARjqAhgnwgIEECMYJ8ICERAuGIMBGNQCGLEDGIAEGIoFwgIIEAAYgAQYsQPCAg4QLhiDARixAxiABBiKBcICCBAuGIAEGLEDwgIOEAAYgAQYigUYsQMYgwHCAgUQABiABMICCxAAGIAEGLEDGIMBwgIIEAAYgAQYywHCAgoQABiABBjLARgKwgIGEAAYHhgNwgIEEAAYHsICBhAAGB4YDw&sclient=gws-wiz
You could put a piece of a "pool noodle" inside the coil so that the insulator does not dangle inside and always stays at the same distance from the coil.
What is the value of the coil ?
Have you sold your Quangshen radio now...?! 😂😂
no, still have three of them ;)
good job
hey Poul, what if you put 2 short wires in the end, like a Y shape.. with diff. lenght.. then perhaps the bandwidth will be wider ? with rgds oz1fjb
hmm, I don't know, never tryed that before :)
Fantastic build but please fold back your wire for adjustment as you cannot undo a cut.
Buddy, you didn't measure the coil's inductance, besides, inserting metal elements into the coil's carcass changes its inductance!
What was the length of your 40m antenna? Did you have exact measurements?
Hi, is 50mm the form outside diameter?
Hi dear Gil! I think that the outher diameter was 55mm. Thank you for visiting my channel, I am very honored by your visit! You are doing very good job! Best 73 Paul :)
@@OM0ET thanks Paul, great channel!
You do not need another wire if you cut too much, just solder thin wire, end of antenna have extreme low current and maximum voltage.
When I trim antenna wire I never cut end of wire just wrap around , no need to cut. So if you need lower frequency just release wire.
You already have bunch of wire. But not everybody.
I believe he wanted to replace that end because it wasn't as pretty as the new "shiny" wire after all that work! 😂
I mean he took all that time to point out how he "hoped" he didn't cut it too short lol. 👍
Everyone would criticism him too for the "imperfect" job.
I thought this too, but why not cut another piece of wire 4cm longer then you had before, simple. 😊
then it wouldn't be perfect in my eyes and I wouldn't be satisfied with the work :)
I always try to make simple and cheap trimming. Last 10 inch of wire antenna not need to be straight horizontaly like rest wire even not need to be same thick wire. Short section "sacrifice" tin wire pointed down woud not make any difference and easy to trimm. If you cut too much replace with new tin wire and continue.
End of wire antenna do not be straihgt at all. Concept is already many time proven and work.
What turn coil end meter antenna?
Looking at your plot should you not have enough space to put up a 80mtr dipole instead of EFHW which is imho a compromise?
yes, but what topic for the video I would have then? ;)
Paul. I am going to put this antenna together using the 40m EFHW as the starting point (I have limited run distance). Would you please confirm my understanding of the rig? After the 49:1 UnUn, a 19+M wire, then the 110mh loading coil and then about 1.5 M wire, cutting this last wire to length to control SWR. Thanks for your help, N7DKE
Yes, that is correct. Antenna will be narrow on 80m but will be usable 🙂👍
@@OM0ET Thank you. 73
Can you please tell what the coil form is called and what it’s supposed to be used for/
In the video description
So, how did the other bands do after the modification? Are they still good?
As I was checking only the 40M band, which is the band what this antenna was made for, there is no significant change in SWR. Still 1:1 in 40M phone section.
in future, do not cut the wire when you are close, fold it back and wrap it around the antenna length. this will allow you the adjust it back to a longer length if you guess too short.
Your wire looks like 12ga, or 14ga, is it?
Good job
sir,what the coil for?
Good idea. Unfortunately a bit to heavy
I would have wrapped kapton tape over the winding. That coil is a nice place for birds to land. Over time the enamel will be gone without any protection. Problem or not, don't know 😀.. 73 OH7WV
Yes, I never understood why people cut the wire. Folding works just fine, I have been building antennas over 50 years now and learned that many years ago.
👍
Americans were SCREAMING at the screen, telling you NOT to cut your wire!
Ця сіра труба на сонці швидко зруйнується (застосовується в приміщеннях)😢
Durará más que tú y yo...
i got some cheap candles and melted them in an old pan and coated my coil in wax.
Looks Heavy ?
☝️🙄
👏👏👍
А,переклад не можна було зробити? Більшість читачів не володіють іноземною мовою!
Nice video for 80m band coils home brew. You are sharing a good ideas for making coils. Adjust a SWR is normally takes a time to cut and try Ha Ha... de HL1SB
For final fine-tuning, NEVER cut a wire, just bend it back.
Fold back instead of cut
..simple 😮
If I want to listen to music, I’ll turn on my FM RADIO!!
Then turn off audio, it's simple 😉
Instead of cutting the wire, you could have actually just folded the wire over multiple times to make it think it was shorter! The end o9f it being folder over doesn't change it's radiation pattern!
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