The EASIEST Antenna to build for Six Meters using one piece of RG-58 coax! kzread.info/dash/bejne/Zpxrt6mHkrrTo7w.html

@indridcold8433

Жыл бұрын

You are correct. However, that may not be convenient for mobile installation. You will think this bizarre. I set up a dual band antenna with a driven 259 centimetre antenna for 11 meter and 10 meter. The driven 259 centimetre antenna shares the same grounded bracket with a 137 centimetre antenna installed 5 centimetres from the 259 centimetre driven antenna. The 137 centimetre antenna is completely grounded to the bracket and not isolated. It is parasitically driven by the 259 centimeter antenna. A 259 centimetre counterpoise also hangs from the grounded bracket. This allows the antenna to successfully transmit 11 meter, 10 meter and most of 6 meters, without any tuner. As long as the operator does not go higher than 53.4Mhz, everything works great for the owner. With the ugly, junk antenna, the operator has been able to make contacts around the planet on 11, 10, 6 meters. I think it is also used with a tuner for lower bands. I am not sure on that.

I got lazy and used a cut piece of old copper pipe above the choke. The cheap analyser showed it to have a significantly wide band from 26.9 to 28.5 with, the ends being 2:1 swr. The operator I gave it to seems very happy, inspire of my lazy cut copper pipe. He put it on top of his garage.

@bbmandal

4 ай бұрын

Dimensions of the Cu pipe?

Surprisingly simple build, and those transmissions came in pretty clean, too. Very impressive.

4 months later this video suddenly becomes relevant for me as spring/early summer has finally arrived. Thank you! Excellent tutorial. 👍

@HamRadioDX

Жыл бұрын

Haha awesome! About 4 months before it was our spring/summer 😂

@GrantVK4GDT

10 ай бұрын

Ha, 1st day of Spring here, yesterday in Australia (Queensland). I took this recently completed antenna out to the sports ground and attached the Sqid Pole to the fence post,did a few checks and it came in high at the top end and perfect at the low. I was able to trim the tip bit by bit to get it acceptable at the low and high ends and perfect in the centre. Thanks Hayden for the instructional video that was practical, well explained and something most people could do. I was listening to people in Japan and South Africa, locals in Darwin Perth and Sydney the Tassie and Vic stations were faint. Anyway I will set it up again today and see if I can make some contacts. Cheers

I made one similar to this for 2m/70cm works great. I didn't attach a separate wire to the inner core I just stripped back the braid the required length. Great video, must try 10m now.

Thanks, that's a great compact antenna. I built a 10m delta loop recently which also works very well but it needs more space as it uses 2 guy ropes.

I built one of these today based on your design and this video. Just slapped it together with pvc tube and duct tape. Worked great! SWR was so low it wasn't indicating on the Icom 7610, so I answered a CQ and straight away got a contact with VK2GJC, 3000km away. Tomorrow I will make it more permanent and get it a bit higher. I want to make one for 20 metres also. (VK6ABC).

OMG you've read my mind. I was only telling someone the other day, "I'll have to make a 10m and 6m flowerpot antenna" and mount it on my squidpole.

@HamRadioDX

Жыл бұрын

Hey mate! I wanted an antenna that was a bit higher off the ground than my 1/4. They work well and are very simple, don't take a whole lot of room either.

Great video. Thanks for sharing your knowledge.

Awesome Hayden! 👍👍👍

Nice build!

They are fabulous. I built one just before Christmas for the New Year SOTA rollover. Going to build one for 21MHz next which is as low as I can go and still fit it on my DX Commander 12m pole.

@paulsengupta971

6 ай бұрын

14MHz should more or less fit on a 12m pole.

Thank you for the video and thank you for the prompt response to my questions. There are lots of guys that make videos but very few are willing to help a guy out. …going for the general next weekend and wanted to get a jump start. Thanks again

@HamRadioDX

Жыл бұрын

Good luck with your test, I'm sure you'll pass it with flying colors!

Brilliant video! As a noob I love stuff like this. Ty for sharing

@HamRadioDX

Жыл бұрын

Glad you enjoyed it! Happy building

Ah! They work great.. nice going Hayden

@HamRadioDX

Жыл бұрын

Thanks Tim! You've had great success with them, it was time to get one on 10m here. Working well!

This is an excellent "how to" video for anyone wanting to learn the whole process from the maths, the drawings, the actual building to the testing after. Big thanks

@HamRadioDX

5 ай бұрын

Thanks glad it was helpful!

@PeterJavea

5 ай бұрын

I am making a list of meaningful videos, like this one here, so as to give it to each new "ONL" Who passes the first amature radio test here at our club in Brussels and becomes, like me, an "ON3". Having someone who can calmly and clearly explain something, is worth GOLD to a beginner. Then he can feel that he too can do it right away.

Buult one awhile back. Absolutely amazing, how well it performs.

Hello, thanks for the video, good antenna👌👍

Hi Hayden, TNX for video, I am going to work portable on 10 m this summer :-) What a nice metal device you have for installing of the mast! 73%88! Raisa R1BIG/OH7BG

@HamRadioDX

Жыл бұрын

Thanks Raisa!

Nice build. You explained it quite well. Even I could build this. 😆

@HamRadioDX

Жыл бұрын

Thanks Phil

Very cool. Thanks. It's appreciated. I might give this a try....

@HamRadioDX

Жыл бұрын

Have fun!

I've built them for 2, 4, 6 and 10metres Great antennas I also dual banded the 2metre one with 70cms using foil sleeve. Superb performance for next to no outlay.

@jameskaras4345

Жыл бұрын

flowerpot dualband.. great antennas

@G0USL

Жыл бұрын

@@jameskaras4345 I built one years ago and couldn't believe the performance! Due to circumstances I had to use it indoors and at ground level. Even so I was regularly talking up to 20miles! And over 40 miles on my helical 4metre one!!

Thanks, buddy! I needed that... Trying to get going in 10M CW with a Xiegu G90 and a coupla spoons...

What I really like about this antenna is it is elevated off the ground.

very nice!

Great video thank you for sharing great job !

@HamRadioDX

8 ай бұрын

No worries at all, did you make one?

Excellent!

@HamRadioDX

Жыл бұрын

Glad you liked it Why-Vee-Why!

I did a 2m version of this ....works well!

Thank you!

Thank you my friend

Thanks for the video! I need a 10m antenna.

all high bands are going nuts

HAM radio is fun 😀

I've been building these for over 20 years for HF/VHF l love them. You can use either a 5 turn choke on a 110mm former or 16 turn choke on a 68mm former for 10m. Mine is currently a 16 turn choke and I've the feedpoint ie the split at 5.37m agl and performance is superb just a few days ago I worked ZS from here in GI on SSB using 5w pep into mine. Great video. De MI5JYK.

@HamRadioDX

Жыл бұрын

Thanks!

Great video… thanks. My local builder, Michael Vk3cmc strips back the outer braid instead of soldering on the top quarter wave. Testing one yesterday, same as you, with a 705 and listening to 2RSY it gave a whopping 2 S-point improvement on receive over the Diamond CP-6, which, though the latter is a compromise, really surprised me. I have worked some great dx with 10; 15; and 20 metre flower pots!

@HamRadioDX

Жыл бұрын

Awesome! Yeah I just used the wire to save a bit of coax (and time) stripping back the braid, but that's correct you can use just one piece of coax for the whole antenna.

@allanjones4283

Жыл бұрын

@@HamRadioDX Hi. Do you strip the dielectric to expose a bare top copper wire, or leave dielectric on if mounted in PVC?? :-)

i made one with thin aluminum tube 1,63 m (radiator)and three radials.. i have qso s from all europe, qatar , uk here in Greece.. swr 1.3--1.4... like skylab cb antenna but shorter.. cheers

Perfect aerial for /p. Either a drive-on mast base , tie the pole to a post or hang it off a tree. Gets you away from the QRM

Thank you for this vidéo ! This is a nice antenna ;-) 73 Sullivan F4HZC

@14KiloWhisky

4 ай бұрын

Le 76 en force 😁

Thank you! 🥰👍

@HamRadioDX

Жыл бұрын

You’re welcome 😊

Cheap as chips and works great.👍

@HamRadioDX

Жыл бұрын

Just worked about a dozen USA stations this morning. Heard SSB too!

Thanks!

@HamRadioDX

Жыл бұрын

Thanks Jim!

Great job!!! Excelent antenna... Yo uso la Flower Pot 70/2 metros con excelentes prestaciones... Saludos desde ARGENTINA, LW5DKN

Just made one, commenting in case the info helps anyone 😊 Final cut 2.35m coax into 2.4m top element. 2x 240-52 torroids with a few wraps. (I think i did 9) Lowest swr is 1.6, pretty flat from 27.8-28.8. 29mhz at 2.1:1. Feedpoint mounted about 8m up. Ive used about 4m of RG58 C/U from Jaycar for the torroid winding and coax section of antenna. Then 12m of LMR400 into the shack. Made 12 contacts on FT8 in 20 minutes of testing. VK2 into the US and Japan at 20watts. Probably the wrong coax - its marked RG58C/U (networking cable). Ive got about 30m of it for free and seems to work fine on HF at short runs. Thanks for the video Hayden, enjoying the 10m/6m stuff 😊

@HamRadioDX

7 ай бұрын

Thanks mate, great build! You can probably get that SWR a bit lower - is the antenna mounted up close to anything metal like roof etc? Good luck with the DX! Hopefully the band opens back up once this flare passes!

@SeedyKidd

7 ай бұрын

@HamRadioDX Only about 2-3m off the roof at the moment - having thunderstorms in NSW so being careful / temporary setup. Will end up at same height but on a pole further down the yard - hopefully a better dip there. VK2KFC - thanks again 😊

@HamRadioDX

7 ай бұрын

Awesome! Hope to work you on 10m soon! Love the callsign too

In the classes at the radio club they made us make this antenna for 2m, but they suggested using a 75 ohm cable instead of 50. We made the two to compare and incredibly it works much better, we were able to open a repeater 70km up a mountain at 3500 meters high

@leo2944

Жыл бұрын

of course it is much more tortuous to learn how to solder a connector on an rg59 cable. but as a prize you get a super cheap antenna that you can use as your first base station

10 meter aka 28mhz is one of my favorite!

@HamRadioDX

10 ай бұрын

Great band

Bottom section is shorter, due to velocity factor, coax slows the signal a bit when used as an elemnt. Good video.coax and it's insulation slow down the signal.

Great video, would it be a good idea to trim the wire a little to bring down the swr to the required frequency.....

Thanks, 73

Centre Fed Coax Dipole. Built several of these for 6m and mostly 2m. The lower half is shorter because of the 'fatter' element size, not velocity factor. Another way to have even less chance of radiation back down the coax, is to actually fold the braid from the top section back down over it's self on the outside. This does however mean that it will be exposed to the elements, but If it's housed within a PVC pipe it doesn't really matter. the VSWR can be lowered by tweaking the turn count of the choke using a VNA.

I built one of these for 2m/70cm. I built it in side of a 1" piece of schedule 40 so I can stick it on a ground spike, hang it from a tree, lean it in a corner or even hold it in my hand in a pinch. Surprisingly good little antenna. Built to spec it was a little bit long. I ended up unwinding a couple turns off the coil and that brought it right down to flat @ 146Mhz where I wanted it. 6m is probably next :) 73 KC3UVF

Way back in the 70s-80s we had 10 Meter on our CB radios, I gad a cobra 148 with 10 Meter .

Getting the materials together now. Is there a benefit or problem running the feed into an antenna tuner?

I made a few over the years . found you can cut wire 3/4 wave and get a tune. great at 70 cm. I found at full legal power using RG 213 that the end of wire ,do a small loop and solder it back to self. glue line heat shrink every thing. The end effect at high power can make corona at night . had this happen on 6 meters. that DX 10 wire can easy do 1500 watt but not RG 58. when doing VHF.UHF better coax like M & P . RG 8X is great for HF and some power . still easy to make coil with RG 8X . this a nice low cost antenna that works great. no carbon fiber pole. use fiberglass . 73's

I seen this on Ali it has the slider it looked interesting and well priced in comparison. Now I see people are doing interesting things with it and seem to like it a lot. Thanks for sharing. You think it would work good with X6100 or just stick with endfed? P.S Not exactly the same you made yours of course but if I got the coil with the slider but then followed your set up?

Hello Hayden, great antenna!. I built one this morning, walked over to the forest just opposite my home, strung it up into a tree with the choke about 2.2m above the ground. Plugged in the NANOVNA and viola - SWR of 1.053. My first contact was ZL out of Hamilton, and I'm in S/W Sydney near Camden. Running the IC-705 on 10W, 5x9 both ways. Happy Dayz!!

@HamRadioDX

Жыл бұрын

That is awesome!

I built one of these last year after having great success with my dual band VHF / UHF flowerpot. What I don't understand tho is the difference in length of the coax portion to the wire portion. Is there a specific ratio between the lengths? Mine is centered on 28.4mhz after initially being long and great for 11m.

Great video… thanks. My local builder, Michael Vk3cmc strips back the outer braid instead of soldering on the top quarter wave. Testing one yesterday, same as you, with a 705 and listening to 2RSY it gave a whopping 2 S-point improvement on receive over the Diamond CP-6, which, though the latter is a compromise, really surprised me. I have worked some great dx with 10; 15; and 20 metre flower pots! Peter, VK3ACZ

@MirlitronOne

Жыл бұрын

Hmm, turning 5 m of coax (even RG58) into single-core wire doesn't make much economic sense, unless you use the braid for something else!

@ptsmonvideo

Жыл бұрын

@@MirlitronOnethe braid is used as the second part of the antenna folded over the coax down from the feedpoint.

Do I assume that the reduced length of the braided coax piece compared to the centre wire top piece is deliberate to offset the dipole and therefore increases the impedance towards 50 ohms?

Nothing wrong with what shown on the video, and it works great , yet we found that an old station master ( 1/2 wave n 11m ) easily tunned to 10m will do better (found one for $10 in a garage sale) , no fuss, cheap, easy to build ( if you can't find a ready one ) and is a DC short, great for noise /QRM rejection and might save your rig if there is a lightning storm is the proximity of your QTH ( direct hit, forget it, lol ) 10m meters is open, let's have fun. thanks for the video.

My simple 10 meter verticle is a 108 inch stainless whip atop 22 foot aluminum military poles with the top most pole fiberglass.with three 8 foot wire radials its been up 9 years and has outlasted 2 of my previous factory made cb style antennas i will never go back have made many DX all over the world.jim KB1PFL

what 2 cable sizes did you use again? and what lenghs i want to do 10 and 11 meters so will need slightly longer but dont know by how much

Could I cut down a 102" steel whip to 36 inches, 3ft and expect it to work well mounted on top of a Ford Ranger angled to the rear? .

Gostei muito resultado obrigado amigo 73

Question, how did the relieved contact show up on the map?

Hi, im not sure what you mean with the tape part?

Hello Hayden, great tutorial, can you please tell me the link for the map shown in the beginning.

@HamRadioDX

5 ай бұрын

pskreporter.info/pskmap.html

Can I use rg8x instead of rg58 thx

Very broadbanded and versatile antenna the T2LT although the acronym really refers to the choke not the complete antenna. On 11 meters I talk over most of the planet with it just now as conditions are as you know the best they've been for quite a while. My choke (ugly balun) is 5 turns at about 4.5 inch diameter iirc. Going to now build one to the dimensions in the video to compare the results. I suspect the tuned transmission line trap may originally have had some sort of variable capacitor in parallel or maybe the capacitance of the coax in the choke is adequate. I'm sure someone will enlighten us.

Cool

Can i do 5 turns of coax only as a choke?

Can you simulate it in MMANA? How?

Im using a half wave dipole in my attic on 10m andvits terrible. Im in a antenna restricted housing unit and i could deploy this antenna quite easily in the trees near the house on a fiberglass pole. Great video! Thank you

@HamRadioDX

3 ай бұрын

Awesome! Glad it helped!

@jasons.298

3 ай бұрын

@HamRadioDX I finally got around to building this antenna and did one for 6 meters too. Both are working great. I also got an Icom 705 and the noise floor is half of what it was on my IC-706. S-1 noise level on 10 meters now! Cheers

Great video. Is it possible to modify this design for use as a CB base station antenna? If so, could you point me to a resource to help understand and calculate the right antenna length and would the number of turns be be different for 11 meter?

@HamRadioDX

4 ай бұрын

Yep! I would start by adding an extra turn onto the coil. Then use the measured frequency/desired frequency to scale. For instance my antenna came out around 28.5 MHz. So to scale down to 27.5 MHz as an example: 28.5/27.5 = 1.036. Multiply that by the actual length I used - 2.5m I think? 1.036 x 2.5m = 2.59m... maybe make it a tad bit longer just in case and you can always cut some off to trim the SWR. Hope that helps.

@TheBudgetMindedMotorist

4 ай бұрын

@@HamRadioDX Thank you! That helps a lot! And thanks for the videos. Looking forward to watching more of them.

Have you tried 5 turns on a 10mm PVC instead?

Good morning. I really liked your video. Is it the same Flower Pot project by John Bishop (VK2ZOI)?

@HamRadioDX

Жыл бұрын

Yes, it is!

Have you ever considered using an FT240-31 instead of an FT240-43? I've used the former for EFHW and it's worked great

@HamRadioDX

Жыл бұрын

Yes I have. I think the 31 mix is a bit better at the higher frequencies, so it should work at 10m and 6m well. I think I actually have a mix 31 on my 6m yagi.

This is a fantastic idea. Quick question though, how would I adapt this to work as a 2m antenna? Thank you.

@HamRadioDX

Жыл бұрын

Check out this link - it has plans to build a 2m version. vk2zoi.com/articles/half-wave-flower-pot/

Diameter of PVC pipe was given at 1.97", what is the length, please?

I built one of these, but wondering if/how you calculated the coil specs, as i only had 1.5" pipe lying around, I tried winding the same length that used and making the other measurements the same but my vna says the lowest dip in swr is much lower, like 20MHz i tried winding more coil which brought the frequency up to target by the performance i feel is lacking and when i hooked up my feedline it got much worse, so googling it seems its being reactive ? as its not a 50 ohm match ?

Nice Video. What sort of power (watts) can be used with this antenna

@rms8698

Жыл бұрын

By using RG58 coax, safe continuous transmitting power (AM, FM, etc) would be around 100~150 watts. RG8x coax can withstand around 400~600 watts. If you need above those numbers, try 10mm diameter coaxes such as RG213, LMR400.

Hayden, Thanks for the video. What are your thoughts on running wire antenna elements over the top of steel roof sections, like we do in Australia and New Zealand, with respect to ColourSteel and other corrugated iron sections? I've tried to find information on this, but most of the hams I've read (in the US) use things like bitumen based shingles over plywood, where they would not encounter in ground effects like this. I've had various issues with metal roofs over the years, is there a solution to this, apart from having to raise your centre-point and the wires at least 1/2 a wavelength above the roofing iron? Cheers, 73, Mike ZL3XD.

@HamRadioDX

6 ай бұрын

Hey Mike, I guess it depends on what antenna it is. If it's a large-ish roof... and a 1/4 vertical, then a colourbond steel roof can act as a great groundplane! I know someone who runs a DX Commander on top of his garage roof and uses it as a groundplane. I've mounted a halfwave vertical on the roof before without problems and the base of that was only about 0.5m above the roof. Of course this is all HF. 73 Hayden

Did i just hear you apologise for using metric measurements 😮 Should be the other way around 😉

Any reason why the 2.5 meter section of wire cant be inside of a PVC pole instead of outside?

@HamRadioDX

7 ай бұрын

It can be inside, but the length will need to be adjusted accordingly

Does it matter if you have wound the coax around the former the opposite way to what I normally do when making chokes?

@HamRadioDX

6 ай бұрын

No that is fine the main thing is the amount of turns and spacing

Hi why dont you use the inner part of coax instead of soldering some wire on for top of antenna, a use rg213 for theese antennas, I have 1kw output.

@HamRadioDX

4 ай бұрын

You can do that... I just saved some coax by using wire.

Could I build this antenna with some Telydine RG-59 Cable (75 ohm) and then use RG 8u for feedline?

@HamRadioDX

4 ай бұрын

You’d need to recalculate the velocity factor correction using RG-59

Hello. Will this antenna work on a balcony and at what angle should it be installed? Thank you

@HamRadioDX

7 ай бұрын

Yes and straight up vertical.

Does the 2450mm. section of coax between the choke and the "element" radiate? Or does it serve another purpose?

@HamRadioDX

Жыл бұрын

Yes. That is the other half of the dipole.

Why would you expect it to be 50 ohms (lower SWR)?

Just a question :D Can you use this antenna the other way around with the output on top and the conductor closer to the ground? I'm thinking bout something that could hang off my balcony.

@HamRadioDX

6 ай бұрын

I'm sure you could try to invert it yes.

Couple of questions. Would there be a problem with RF getting past the choke using RG8? Is there a reason you didn’t use one piece of coax and strip it like you did with the 6meter?

@HamRadioDX

Жыл бұрын

Yeah just to save a few meters worth of coax. RG-8 will require a different turns/diameter ratio due to the larger size. You can find the answers on google somewhere just search for air wound chokes.

@allen_steel1236

Жыл бұрын

If you wish to use RGA coax, to make your choke. Use a 4-in diameter pipe. Which would be four and a half inch outside diameter. Pvc. Wind approximately 20 turns to 30 turns, it will vary a little bit. So depending on the quality of the coax. Phone core versus solidcore if it's true rg8 phone core you'll need 30 turns. Also you need the larger diameter when you start to bend the coax the radius of it becomes important as it compresses the insulation. Which thereby reduces the power handling of the antenna being antenna has extremely high voltage on the quarter way of section coming down from the vertical before the choke. You don't want to skip here. The fact it's best if you wind the 30 turns, keeping them tightly spaced together. Then go down another quarter wave on the coax and add five or six ferrite beads, that fit tightly. String the entire thing up vertically so that the so she had to do it choke and the second quarter wave section where the beads are is also vertical, preferably hanging in free space not against a mast. This will make essentially a cleaner antenna, providing a little bit of gain and a lower takeoff angle around 15 to 20°. If you look up a High Gain V6 antenna, will give you a little background regarding the second grounding sleeve

Instead of soldering the end could you use wire connectors?

@KC3UVF

Жыл бұрын

I'd imagine you probably could, but I think durability/longevity would become an issue at that point. KC3UVF

Would you (or anyone reading this) know if the 10-meter version could be built with TV coax? I've built the so-called "double bazooka" dipoles with TV coax (20 and 40 meters) and have had great success with them at 100 watts. I just don't know if this type of coax would be a problem with this design because of the coil. I have a crap-ton of this coax and don't really watch TV. LOL

I really need to get on 10m. When you say 50mm does the outer diameter actually measure as 50mm. Bunnings sells DN40 and DN50 PVC pipe and for those the measurement is inner diameter. For DN40 pvc-u pressure pipe the actual outer diameter is 48mm. Also I used my nano vna as a dip meter. Where you connect it to a short length of wire that makes one turn around the coil. This works really well for making loading coils with a know test 33pf in parallel. I tried making a coax coil but found I couldn't get it self resonant (outer shield to outer shield) on 28.5mhz. In fact it had two resonant frequencies and wouldn't come up or down to 28.5mhz. I also found feeding a fibreglass telescopic pole through the centre (or even next to it) affected the self resonance. So I'm wondering how important the self resonance actually is. It seems very sensitive to how tight the coax coil is wound (shield to shield inter turn capacitance) the number of turns and what's nearby including my fibreglass telescopic pipe (Haverford 6m). So I think it would be a miracle to get it to 28.5Mhz in practice. If you trace back the origins of 24 turns on 50mm pipe you find they came from a self resonance calculator. Air coin 28 turns adjusted to 24 turns due to the PVC tubing.

@HamRadioDX

3 ай бұрын

I think the PVC I used was an old piece of 50mm tube from... somewhere? In future builds rather than a coil "air choke" I'd use a FT240-31 toroid with a few wraps through it.

How do i calculate the number of turns for other frequenties (PA3FDY)

@paulsengupta971

6 ай бұрын

Do a search for "ugly balun" or "air cored coax choke" and you'll find calculators.

APROX 2.50m radiator and 3 radials and its ok.. made many contacts with this,,swr 1-1, 1-2

Nicely built and helpful that we can build one too. May I ask sir, are Station Master aluminum halfwave antennas for 10/11 meter still being built there? I believe its an Australian product. Thank you.

@HamRadioDX

9 ай бұрын

Hey mate, Yes Stationmasters are still being built by a couple of sellers. www.gccomm.com.au/collections/27mhz-radios-and-antennas/products/grazy-master-27mhz-base-antenna shockwaveantennas.com.au/

@franciscolopez3229

8 ай бұрын

​@@HamRadioDXThank you so much sir for the reply. I've got a nephew down there and maybe ask him to buy one for me. By the way sir, for this antenna build in this video, can I use a bamboo pole instead to be a lot more cheaper? Here in the Philippines, we do have a lot of different kinds of bamboos thst slim and light. 73 and all the best to you and your family.

@paulsengupta971

6 ай бұрын

@@franciscolopez3229A bamboo pole would be ideal.

@paulsengupta971

6 ай бұрын

@@franciscolopez3229A bamboo pole would be ideal.

Will I need to change the choke also for 11 meters or just the antenna length?

@BaronVonNebula

6 күн бұрын

Did you ever figure this out? I’m building one this weekend

Hi - do you have any idea what the take-off angle(s) and gain might be? I was trying to compare this to a "ringo" antenna.

@allen_steel1236

Жыл бұрын

Since it's a quarter way, the game will be zero, technically minus 1db. But since there are no ground radios, and he's using a quarter wave section of the coax jacket as the counterpoise. And then using chokes to isolate the feed point. They will put a sleeve down over the feed line that's equivalent to a quarter wave connected to the braid at the top but left floating at the bottom. That adds extremely high impedance point to choke out any RF floating on the coax. And you don't need the giant balance at the bottom. The major problem with his design is Ark out and burnout. You're going to have an extremely high voltage potential at the junction where the braid ends and the vertical wire begins. Even the slightest dick in that insulation will cause it to flash over. We're looking at the point where current and voltage inverse. So we extremely low current but extremely high voltage. Now you can go above that quarter way of section then make a another quarter wave stub that goes out to the side, that can be made out of just a piece of coax, Shield connected to the bottom radiator Center conductor connected to the top radiator however that coax needs to be cut with an antenna analyzer so that you can trim it to an exact quarter wavelength. The far end of that coax is short it together. Above that you add another vertical wire that can be either a quarter wave or a half wavelength. But again without ground radials just antenna is going to have a take off angle somewhere of 25°. Hence why it's working really well for Skyway of propagation.

@paulsengupta971

6 ай бұрын

@@allen_steel1236 You have it backwards. Where the coax comes to an end and the wire attaches is the high current low voltage part - the centre of the half wave dipole. The coax braid between the choke and that point is the lower half of the dipole, the wire is the upper half. The high voltage points will be at the top of the wire and the bottom of the coax sleeve, just where the choke is. The take off angle will be the same as any other half wave dipole mounted vertically, i.e. you get the doughnut around the centre, with a pretty low angle of radiation. As for gain, it's 0dBd as it *is* a dipole. It's just a different way of building a half wave dipole where you don't have to run the coax at right angles out from the centre, half way up the pole. This could also be expressed as 2.15dBi.

This may be a dumb question, but where did you get your numbers? I get the half wavelength for the center conductor, but where did you come up with the 2450 for the braid length and how did you get the number of turns for the choke? Are there formulas for these or did you just pull them out of the air and base them on experience?