Great idea. I already have a 20m vertical up, so will try adding the extra bit and see how it performs. It might be worth noting that elevated radials can work very well on a vertical and seem to do so with just a few. Thanks for your hard work in making these videos!
What gauge wire did you use? I am thinking this is the way to go for me since I am limited on space and want to go mobile occasionally. Also is the coil wire different than the actual radiating element? Thanks!
Thanks for making these videos. Not only are they enjoyable to watch but they fill in gaps in my knowledge and experience. Also thanks for using metres rather than feet(!) That wont be popular...
trap Indeed needed here, the loading coil gives the desired frequency in compromising the length of the antenna, anyway I have no doubt that your antenna works! Good luck and a pleasure to see you on TH-cam.
You know the old adage longer than too short, well I left 2m 30cm and still too short. I had to add some and cut and mine came in at 5.03 m ( 16ft 6inches ) 1:1 SWR 20m, the coil 25 turns and the tail once cut for resonance was another 3m 13cms. This was using my GAP vertical with the coil removed on a various length radial bed. So make sure you leave plenty to cut back to. I have a crocodile clip to attach the coil to the tip of the GAP set at 20m and use it as an L shaped antenna. Gap is set at 20m, coil removed I can retune each band from 20m to 6m as 1/4 wave. Thanks for posting 73's Andy M6APJ
In the coil! In 40 meters will be perfect and in 20 NO.My friend, this way it's just a load coil! And all the positive results you had is because of the cable fed into the base which shows 50 impedance you made at the base! There is no electric RF stop for 20 meters just by adding a ceramic capacitor in series to the coil. This is how I build my antennas and it works great! 4Z9MND [ Just for your information I have been following you for a long time, I have taken a lot of ideas and experience from you for the field of amateurs, you convey things perfectly! Continue like this and good luck]
I am afraid you maybe not have understood the way a coil works. If can be a loading coil or a trap. This depends on the inductance and the frequency, Watch the video again and you will probably get the idea. There are commercial examples of this as well. 7#3 Peter.
Hi there, I build this antenna from an 11 meters cb antenna and some spare alu pipes. Removed the original 11 mtrs coil. Lenght of antenna is approx 4,80 mtrs high to the made coil ( 30 microh ). After that coil about 1mtr alu pipe. It really runs with a 1:1 on 20 and 40 meters. I use 6 radials of 5 mtrs. I will remake the coil for 40 mtrs because of the small range right now. So I will try to get 2 mtrs pipe after the coil in stead of the 1 mtr now. But It is working really good. Thanks for your lively video's. Brgrds PD1RJH
Would a 7mtr roach pole do the same job as a spider pole as to me a roach pole carbon fiber looks exactly the same be 12 metr 20mtr 7mtr or 10 mtr length as the antennas length intotal would be 7 metrs in all i have 7mtr roach pole i used to use for fresh water fishing and could utilize it to save even more costs thanks for video its great stuff you do
@@watersstanton thanks for the reply and yeah the load would be minimal as 7metrs total length 14 or 12 gage wire and an inductor should only weigh in at a few pounds and it wasnt cheap make roach pole very sturdy made carbonfiber
Loved this video Peter very good!!! Wouldnt it work instead of using a trap/coil ,to just run a 1/4 wave length of 40m straight up your spiderbeam?? So roughly 10m of wire?
@@rogerbirchall9037 hi roger ive just made this antenna, a quarterwave vertical for 40m. What are your thoughts on its performance? I havent tried mine yet.
A quarter wave vertical on 40 will not be resonate on 20 meters, but it will be resonate on 15 meters. This is the antenna I use every day with two elevated 33 foot radials. Try it, you'll like it. On 20 meters it acts like an end fed half wave so the input impedance is extremely high.
For quarter wave verticals a ground of some kind is needed. A stake works but radials work much better. Length is not critical. Whatever you can fit in. Peter.
Hi, I built this antenna however i am not able to get any signals in either bands, here is my construction details 1. Wire - 1 sqmm ( 2m and 5m as per design given) 2.15feet fishing rod mounted on 8ft mast 3.coil 24 turns on a 5cmm dia pvc pite at the end of 2m followed by 5m wire 4. 3 radials connected to braid of coax feet point pls note i am using this with RTL SDR v3 connected to a HamIT Upconverter using SDR console, i have tested this antenna in 2 modes (I am SWL working towards licence) 1. Antenna connected to upconverter which is Antenna ->Upconverter->RDL SDR v3 2. Antenna connected to RTL SDR v3 directly in either cases i dont seem to pick up anything. Pls suggest to trouble shoot
I'm planning a 20 / 40 vertical with a 20 meter trap in the center. How much will a 20 meter trap shorten the 40 meter calculated portion of the antenna? Is it significant? How to go about doing a rough calculation for starters?
The measurement cannot be calculated because the L/C ratio is not normally published. Simple answer is test it with a wire mock up. Establish resonance for 20m. Then add the trap and then try adding about 3m of wire. Test the 40m resonance then adjust this length. 73 Peter
Peter, I used the same length of coil wire on a 1 inch plastic water pipe , will it make a difference ? Constructed as per my previous post. Thanks for the vid it’s inspired me again !
As soon as you change the diameter the coil value will change. But dont lose sleep over it. Smaller diameter means more turns needed. Just experiment - thats what I did. Peter.
Thank you Peter, we re about to move house with all that entails, one of these would be very handy to install quickly, I'll take a look at the spider pole on your store website, I've seen you use them quite often, which I feel would be good out in the countryside where we moving to ,also allowing me to go portable on nice sunny summer days ps, there's nothing wrong with FT & Inches , it's what we were taught so it's fine with me ,I should think a lot of other radio amateurs as well,. the young ones can work it out. Paul M0BSW
Paul collins. D'accord, Genau, estoy de acuerdo, sono d'accordo, I agree about the feet and inches. Anyway I'm told that the metre, based on the diameter of the Earth, was a mathematical mistake but by the time they found out, it was too late to change it! Just stuck with it! G3NBY
Peter, I love your videos. We are about the same age.. I think I have you beat by a few years though. However, when I watch them, It's like sitting down with my grandfather.. a good, thoughtful conversation. That said.. I am far from antenna literate.. So this brings up a question... How could this be modifiable to work on 10.15, 20 and 40? Would another choke be added for 15 to 20?
Just for us complete newcomers to radio it would of been nice to see the other important parts. The radials and how their connected and how to connect the feeder etc . Without seeing all the parts sadly i'm none the wiser. I've noticed on a lot of youtube videos about radio they assume everyone is fully up on the subject even if its a video for beginners. Most frustrating sadly
Steve, there is nothing very technical about connecting the cable etc. The inner conductor is connected to the vertical wire - use electrical joining block for example. A radial is simply a length of wire that is connected to the braid side of the cable at the same poin. It is in effect an earth wire that just lays on the ground. There are man y videos on youtube showing radials. 73s Peter,
Thats really great info, just another aerial in the garden for the missis to moan about lol. But hay ho always looking for that perfect aerial for the location.
"Mustn't talk in FEET, must use Meters" I understand old money better, but I was at school when it all changed, they just got us used to old money and had to say "We are using this now, it is called Metric and we have to learn it now!" 8 - (
I say use what measurements you where taught at school, like me you learned FEET & INCHES , let the young ones use their brains and work it out. Good idea for a short ant. 73' Charlie. G1WAE.
Don't use metres. We're out of EU now and we fought hard enough to do it! Do you buy litres of bier, er beer ? Great video. Using a non metallic support, could the choke be wound on the pole or is the diameter insufficient at that height? Thanks for another, as always very clear video. Have you captured the market in good weather? 73 _ _ . . . . _ _ _ . _ ... _._ _
I enjoy your videos, but circumstances dictate that most of the time its with subs. Im shocked that a clear developed 'english' accent like yours comes out as gibberish half the time!
Great idea. I already have a 20m vertical up, so will try adding the extra bit and see how it performs.
It might be worth noting that elevated radials can work very well on a vertical and seem to do so with just a few.
Thanks for your hard work in making these videos!
It's really great that you are sharing your knowledge and expertise on amateur radio with us and a pleasure to watch thanks.
I built this one for field day this morning, in about an hour I was on the air. It tunes easy and works good.
What gauge wire did you use? I am thinking this is the way to go for me since I am limited on space and want to go mobile occasionally. Also is the coil wire different than the actual radiating element? Thanks!
Its nice to have a channel that’s not focused on KW and Huge antennas, and big gardens. Keep up the good informative videos, stay safe 73s 2E1HKO
Brilliant man! I have a 20m vertical, this sounds like a great way to add another band with little work
Thanks for making these videos. Not only are they enjoyable to watch but they fill in gaps in my knowledge and experience. Also thanks for using metres rather than feet(!) That wont be popular...
trap Indeed needed here, the loading coil gives the desired frequency in compromising the length of the antenna, anyway I have no doubt that your antenna works! Good luck and a pleasure to see you on TH-cam.
Thanks for viewing the video. 73 Peter.
You know the old adage longer than too short, well I left 2m 30cm and still too short. I had to add some and cut and mine came in at 5.03 m ( 16ft 6inches ) 1:1 SWR 20m, the coil 25 turns and the tail once cut for resonance was another 3m 13cms. This was using my GAP vertical with the coil removed on a various length radial bed. So make sure you leave plenty to cut back to. I have a crocodile clip to attach the coil to the tip of the GAP set at 20m and use it as an L shaped antenna. Gap is set at 20m, coil removed I can retune each band from 20m to 6m as 1/4 wave. Thanks for posting 73's Andy M6APJ
Enjoy your step by step learning howto built an antenne, Peter! Thanks!!
I realize I'm kind of off topic but does anyone know of a good website to watch newly released movies online?
@Kashton Cole Try flixzone. You can find it by googling :)
@Ryder Lochlan Yea, been using Flixzone for since march myself :D
@Ryder Lochlan Thanks, I signed up and it seems to work =) I really appreciate it!!
@Kashton Cole no problem :D
In the coil! In 40 meters will be perfect and in 20 NO.My friend, this way it's just a load coil! And all the positive results you had is because of the cable fed into the base which shows 50 impedance you made at the base! There is no electric RF stop for 20 meters just by adding a ceramic capacitor in series to the coil. This is how I build my antennas and it works great! 4Z9MND
[ Just for your information I have been following you for a long time, I have taken a lot of ideas and experience from you for the field of amateurs, you convey things perfectly! Continue like this and good luck]
I am afraid you maybe not have understood the way a coil works. If can be a loading coil or a trap. This depends on the inductance and the frequency, Watch the video again and you will probably get the idea. There are commercial examples of this as well. 7#3 Peter.
Excellent and informative I appreciate your expertise!! Cheers from the US
Glad it was helpful!
Hi there, I build this antenna from an 11 meters cb antenna and some spare alu pipes. Removed the original 11 mtrs coil. Lenght of antenna is approx 4,80 mtrs high to the made coil ( 30 microh ). After that coil about 1mtr alu pipe. It really runs with a 1:1 on 20 and 40 meters. I use 6 radials of 5 mtrs. I will remake the coil for 40 mtrs because of the small range right now. So I will try to get 2 mtrs pipe after the coil in stead of the 1 mtr now. But It is working really good. Thanks for your lively video's. Brgrds PD1RJH
Wouldnt the coil make a small change at 20m? Why not tune the 20m element with the coil attached from the begaining
Enjoyed this, think I will be making this one ☝️
Good video Peter, thanks 👌
thank you, i created the dipole antenna with that schematic, it works very well.
Great 👍 73 Peter
I wonder if putting a coil like this on each leg of a dipole would work in essentially the same way.
Ranger, yes, it will work in a dipole configuration. There are commercial versions of this available to buy.
Would a 7mtr roach pole do the same job as a spider pole as to me a roach pole carbon fiber looks exactly the same be 12 metr 20mtr 7mtr or 10 mtr length as the antennas length intotal would be 7 metrs in all i have 7mtr roach pole i used to use for fresh water fishing and could utilize it to save even more costs thanks for video its great stuff you do
Roach poles are quite thin so you need to make sure any lateral load is very small.
@@watersstanton thanks for the reply and yeah the load would be minimal as 7metrs total length 14 or 12 gage wire and an inductor should only weigh in at a few pounds and it wasnt cheap make roach pole very sturdy made carbonfiber
Where is the shield from the coax going to? The core i get.
I’m going to measure 20m section then continue to wind the coil with the same wire , then continue with the 40m section, no breaks in wire
Sounds good.
Thank you for a great instructional video. You are a wealth of knowledge. Thanks for sharing your experience. 73, Mark WU6R
My pleasure!. 73 Peter
So no matching transformer is required for this one?
Loved this video Peter very good!!! Wouldnt it work instead of using a trap/coil ,to just run a 1/4 wave length of 40m straight up your spiderbeam?? So roughly 10m of wire?
Thanks Andy. 73 Peter
I have a 1/4 wave vertical for 40m , I tuned it against a 10m counterpoise , just trim CP for resonance, works well. CP above ground of course.
@@rogerbirchall9037 hi roger ive just made this antenna, a quarterwave vertical for 40m. What are your thoughts on its performance? I havent tried mine yet.
A quarter wave vertical on 40 will not be resonate on 20 meters, but it will be resonate on 15 meters. This is the antenna I use every day with two elevated 33 foot radials. Try it, you'll like it. On 20 meters it acts like an end fed half wave so the input impedance is extremely high.
good video sir, 1 question ... at what resonance frequency should the choke be?
I noticed you referenced ground in the drawing is that a stake in the ground, or ground radials and how long?
For quarter wave verticals a ground of some kind is needed. A stake works but radials work much better. Length is not critical. Whatever you can fit in. Peter.
Hi, I built this antenna however i am not able to get any signals in either bands, here is my construction details
1. Wire - 1 sqmm ( 2m and 5m as per design given)
2.15feet fishing rod mounted on 8ft mast
3.coil 24 turns on a 5cmm dia pvc pite at the end of 2m followed by 5m wire
4. 3 radials connected to braid of coax feet point
pls note i am using this with RTL SDR v3 connected to a HamIT Upconverter using SDR console,
i have tested this antenna in 2 modes (I am SWL working towards licence)
1. Antenna connected to upconverter which is Antenna ->Upconverter->RDL SDR v3
2. Antenna connected to RTL SDR v3 directly
in either cases i dont seem to pick up anything. Pls suggest to trouble shoot
Sdr should receive something with any decent length of wire attached. I think you have an issue with sdr or upconverter.
I'm planning a 20 / 40 vertical with a 20 meter trap in the center. How much will a 20 meter trap shorten the 40 meter calculated portion of the antenna? Is it significant? How to go about doing a rough calculation for starters?
The measurement cannot be calculated because the L/C ratio is not normally published. Simple answer is test it with a wire mock up. Establish resonance for 20m. Then add the trap and then try adding about 3m of wire. Test the 40m resonance then adjust this length. 73 Peter
Thank you!
Great job!
Peter, I used the same length of coil wire on a 1 inch plastic water pipe , will it make a difference ? Constructed as per my previous post. Thanks for the vid it’s inspired me again !
As soon as you change the diameter the coil value will change. But dont lose sleep over it. Smaller diameter means more turns needed. Just experiment - thats what I did. Peter.
@@watersstanton thanks will do when wx improves !
Can I use a coil like this on a half wave end fed? So the resonance is half wave on 20 and 40.
Thanks Jeff ke4fwe
Yes you can if the object is to reduce length. Otherwise just feed a halfway on 40m which will act as 2 x half waves on 20m.
Good job, and a nice simple antenna. Would be even better if you stand a little to the side so we could see the whole antenna. :) w6akb
Thank you Peter, we re about to move house with all that entails, one of these would be very handy to install quickly, I'll take a look at the spider pole on your store website, I've seen you use them quite often, which I feel would be good out in the countryside where we moving to ,also allowing me to go portable on nice sunny summer days ps, there's nothing wrong with FT & Inches , it's what we were taught so it's fine with me ,I should think a lot of other radio amateurs as well,. the young ones can work it out.
Paul M0BSW
Paul collins.
D'accord, Genau, estoy de acuerdo, sono d'accordo, I agree about the feet and inches. Anyway I'm told that the metre, based on the diameter of the Earth, was a mathematical mistake but by the time they found out, it was too late to change it!
Just stuck with it! G3NBY
Peter, I love your videos. We are about the same age.. I think I have you beat by a few years though. However, when I watch them, It's like sitting down with my grandfather.. a good, thoughtful conversation. That said.. I am far from antenna literate.. So this brings up a question... How could this be modifiable to work on 10.15, 20 and 40? Would another choke be added for 15 to 20?
hOW TO AFFIX RADIALS?
Thanks for the idea, please do talk in feet. Britain supposedly did Brexit. Us older folk are more comfortable with imperial measurements.
Just for us complete newcomers to radio it would of been nice to see the other important parts. The radials and how their connected and how to connect the feeder etc . Without seeing all the parts sadly i'm none the wiser. I've noticed on a lot of youtube videos about radio they assume everyone is fully up on the subject even if its a video for beginners. Most frustrating sadly
Steve, there is nothing very technical about connecting the cable etc. The inner conductor is connected to the vertical wire - use electrical joining block for example. A radial is simply a length of wire that is connected to the braid side of the cable at the same poin. It is in effect an earth wire that just lays on the ground. There are man y videos on youtube showing radials. 73s Peter,
Thats really great info, just another aerial in the garden for the missis to moan about lol. But hay ho always looking for that perfect aerial for the location.
It's not just mine that moans then :)
@@paul-c7541 I have one that will not let me put an antenna up! Says it is not allowed here! :-((
"Mustn't talk in FEET, must use Meters" I understand old money better, but I was at school when it all changed, they just got us used to old money and had to say "We are using this now, it is called Metric and we have to learn it now!" 8 - (
I say use what measurements you where taught at school, like me you learned FEET & INCHES , let the young ones use their brains and work it out. Good idea for a short ant.
73' Charlie. G1WAE.
Clever signals know which part of the antenna to use! LOL
Yep!
Don't use metres. We're out of EU now and we fought hard enough to do it!
Do you buy litres of bier, er beer ?
Great video. Using a non metallic support, could the choke be wound on the pole or is the diameter insufficient at that height?
Thanks for another, as always very clear video.
Have you captured the market in good weather?
73 _ _ . . . . _ _ _ . _ ... _._ _
LOL I bet if someone tied your hands to your side, you would not be able to talk.
I enjoy your videos, but circumstances dictate that most of the time its with subs. Im shocked that a clear developed 'english' accent like yours comes out as gibberish half the time!
i do not agree
Boo hoo😭