Hi, this is in effect not a dipole. It's a 1/4 lambda vertical with 1/4 lambda skirt of the shield braid that acts to stop the common mode current that tends to flow along the outer skin of the shield braid. You do have a coax cable 1:1 choke BalUn too to serve the same purpose. Instead it can take the form of a ferrite loaded CMC (common mode choke) by having 8 turns of the same coax cable wound on an FT240-43. There can be 4 turns on one side of the toroid with the cross winding of the other four turns (Joe Reisert's style) to have the ends on the opposite sides of the toroid. If needed you can have a suitable ABS or Polycarbonate water tight and weather proof box with 2×SO239 connectors mounted that can be detached for easy portability. And you are trimming the 1/4 lambda vertical radiator only but not the shield braid of the coax cable for obtaining the lowest SWR. Thanks for the post. De VU2RZA

@subramanianr7206

3 жыл бұрын

Thanks for your response 👍❤️ De VU2RZA

@TheEmbeddedHobbyist

3 жыл бұрын

Whats the difference, the inner is one half of the antenna, the outside of shield/screen is the other. No different than running the coax up to a dipole. The coil just takes the rest of the screen out of the equation without affecting the current on the inner conductor and the inside of the screen. You just have to remember that to RF the inner surface of the braide is totally isolated from the outer surface. Only where the braide stops does the rf current start to flow on the outside as it turns the corner, and the Inside becomes the outside.

@paulsengupta971

3 жыл бұрын

It's a sleeved dipole. The second "half" of the dipole is the coax outer before the RF choke at the bottom. This design is generally known as a "flowerpot" antenna. As an aside, I suspect if you wanted to make it lighter, you could use a thin piece of wire for the top 5m and solder it onto the inner of the length of coax. That way you use 5m less coax and make the whole thing a bit lighter and cheaper. Edit: I see Peter's made the same comment below!

@TheEmbeddedHobbyist

3 жыл бұрын

@@paulsengupta971 I like it, it's a sleeved dipole, a 1/4 Lambda vertical, or just a plain old 1/2 dipole. 1/2 wavelength each side of a coax feed point. you could just cut the coax and connect to 2 x 5m bits of wire soldered to the end. which is in affect 5m inner, plus 5m of outside skin of the braid. and the choke to disconned the rest of the braid from the RF. sorry Flower pot as well ;-)

@subramanianr7206

3 жыл бұрын

@@TheEmbeddedHobbyist hi, a centre fed dipole is a symmetric device with the feeder connected at the centre of the half lambda long radiator (quarter lambda sections on either side). If erected properly in free space, there is no need for a CMC (common mode choke) that would otherwise be required to stop the current flowing down from the feed point to the transmitter along the outer skin of the coax cable braid. The radiation pattern you get would be the typical donut with broadside radiation and nulls on the ends of the radiator and a feed impedance of around 75 ohm (in the case of flat top configuration) and a sort of omnidirectional pattern with reduced feed impedance around 50 ohm in the case of inverted V installation. Now you can tell me what kind of radiation pattern this so called "center fed vertical dipole" would have to offer and the role of the feeder with respect to the radiator. How do you assure symmetry in the contraption!?

This design goes back many years and was popular on VHF. You can replace the coil with a few turns around a ferrite core. Rather than struggling with stripping back all that outer coax covering, simply solder a 510cm length of single cor to coax inner and seal with glue gun. Peter G3OJV

@TechMindsOfficial

3 жыл бұрын

Thanks for the information Peter. I wonder how many turns and what type of ferrite would work? I guess it could even be put into a box? And then have an SO239 socket so a coax feeder can be attached easily. I also wonder how this design would perform against the design in the video. PS. I Enjoy your videos Peter, keep them coming! Thanks, Matt, M0DQW

@MidlifeRenaissanceMan

3 жыл бұрын

@@TechMindsOfficial it’s really similar to the 2M “Flower Pot” antennas that a short Duck Duck Go will reveal There is also a 5/8 wave design that inserts capacitance to physically extend the top element and a tuning stub on the lower half of the antenna. While aimed at the 10m (11m) crowd, I’m sure it would extend out to 20m at around 42’ or 12.5m long. I had some success with a shortened 3/4 wave on 20m brought down to that 0.625 - 0.64 wavelength physical size using a ground plane. I’m working on an end fed version that is 1/2 wave for 40m, full wave for 20m and 5/8 waveish tall

@yamakawa511

3 жыл бұрын

Once you get the hang of stripping back the coax it's not a drama. The fiddliest part of it was cutting the plastic outer sheath although in hindsight a piece of scrap timber with a groove cut into it to lay the coax in would have made even quicker and safer. I liked the idea of a single piece of coax all the way to the transceiver without any connections. I might try the ferrite core(s) as a common mode choke in place of the coil. It would make the whole arrangement a little less bulky. 73 Y

@MidlifeRenaissanceMan

3 жыл бұрын

@@yamakawa511 true. Effectively this is the technique I use to ground my 40m mobile antenna on the mag mount. Technically, coax can be considered a 3 conductor cable. Core, inside the shield and outside the shield. I use the outside shield to capacitively couple to the car body by running it tightly down the pillar and along the floor pan before it hits the radio. There is a common mode choke 30cm before it hits the radio. Matches neatly across the bottom 100KHz of 40m for mobile CW operation and the lower portion of the aussie voice segment The common mode choke breaks the outer shield as a conductor at RF. Science !!!!!! :-)

@G6DDX

3 жыл бұрын

@@TechMindsOfficial one example here g0kya.blogspot.com/2010/11/efhw-monoband-end-fed-half-wave-for-10m.html

I'm running one of these for 10m now, it works better than any single wire antenna I tried. i also made a 2m version and 70cm version. The 70cm is cute...15-16cm radiator, 3 turns of coax around a 25mm former as a choke, I think it's about 18 inches of coax in total and works fantastically on my HT. All of them are 1:1.05 or less SWR.

Nice idea! I am using this popular design for VHF vertical dipole few years and I am satisfied. Instead removing the outer braid and plastic jacket of the coaxial cable (which can be pretty much difficult), I suggest the use simple piece of wire (510 cm length) soldered to the inner central conductor of the coaxial cable.

Hi Mat another excellent tutorial video as always, I have made the same antenna but used 13 turns round a 4 inch former and a length of wire instead of the center dielectric, I worked 6 new dxcc on my first outing and was well impressed, I use the 12m spiderbeam to mount the antenna. Good dx 73.

Awesome video matey as usual :) and its fab to have you as a member of the G8AMC :)

This antenna has been described in an ARRL Handbook decades ago for several bands and types of coax. Excellent performance was obtained for the 20 and 30m version I build. Good luck and good DX with yours. 73's, Patrick ON4KNP/OT5Q

@TallTexasGMan

2 жыл бұрын

Do you recall which one or what article?

K)MAN, I built this antenna and added a Reflector and Director using 8' spacing, just to see if it worked and WOW did it work GREAT! So I put up an Array. This consists of one Reflector at the center, 4 Driven Elements, ( One every 90 degrees) and 4 Directors, (One every 90 Degrees). I used an Ameritron remote coax switch to select the driven elements. The antenna is a Winner on 20 Meters and can be fashioned for any band 10-20 meters. Using fiberglass poles from DX Engineering, 12 meter vertical poles were easy to build. I used 5 gallon paint buckets filled with concrete and a pipe sticking out to slip the squid poles onto. I fed each Radiator with a 1/4 wave 75 ohm coax which became a delay line and turned the non used Radiators into additional reflectors which enhanced the forward gain. I am getting 2 to 5 S units of gain over a 20 meter Dipole at 20'!! Seeing how the DX Commander is built and using some old Quad antenna designs, I am thinking this antenna could be a 5 band array, but is going to be a wire nightmare!! Jim K0MAN

I made this antenna about 2 months ago, comparing it to my 20m dipole and 20m DX Commander antenna, I was pleasantly surprised how well it performs, although I only had 75ohm coax laying around I have been able to work most of the world so far. SWR is around 1:1 - 1.5 at 14-15mhz. It is typically my go to antenna for 20m DXing. Thanks for the video! 73.

Thanx fer the video! I built one and it works great on 20 meters. I ran it up a 12 meter Spiderpole mounted on a drive over stand for portable use. Works like a charm for my POTA ops… 73 Fred W0SP

@StuM0OVG

2 жыл бұрын

Exactly what i use for POTA

Great Video Matt and just goes to show you dont have to spend loads of money on antennas. Ive been using one of Stuarts t2lt's on 11m for a few years and another for 17m and they both perform great.

I built this vertical two weeksmago and tested it today. WOW it worked like a charm. I didn't have straight up but rather at a 45 degree angle. It read 1:1 & 1:2 across the General band here in the US. Thankmyou, thank you! KI5IQE

Fun watching your vid. Just a comment from an old guy, the outer sleeve is called a Bazooka or Sleeve Choke, and a few other terms. Worked good 60+ years ago when I made my first one for 10 meters during Cycle 19. They still work good. And yes some of you guys will want to jazz it up with ferrites or capacitors, etc. There is still efficiency in the simplest version with a single piece of coax and no cutting, soldering, etc. And the braid you slipped off the tip makes really nice ground straps and such. k8do

I made a 2m version of that antenna back in high school and it's probably the best performing antenna I've ever built

M7RJJ here. Gave it a try. First contact in to Italy in daytime running 10 watts on 20 metres

@TechMindsOfficial

3 жыл бұрын

That’s great news! Better satisfaction knowing you made it yourself too! Cheers

Thank you for this, it is what I have been looking for with portable.

@TechMindsOfficial

Жыл бұрын

You’re welcome 😉

Hi, Yes I made a couple of these T2LT type antennas for the 11m band, one for me & one for my son who is currently not licensed for HAM radio. these both worked great both at home & on holiday. I saw you video last night & I thought I would give this 20m version a try, luckily I had 20 metres of RG58 left on a spool in the shack, so I got started today & it was all done in just over an hour, unfortunately, I ran out of time & could not set it up on the mast to test it, I did however, stick a meter on it & found it to be showing 1.674 Ohms at the plug end, all continuity checks where ok, no shorts. I double checked the entire build & everything is as per the specs given, I can't see chopping or adding a few cm's making much difference. I will have another look tomorrow during the day & see how it goes. Thanks for the video.

@djwright1802

Жыл бұрын

UPDATE !! ... I got to test the antenna today 28/07/22, I put a piece of heat-shrink tube at the 510cm point of the radiating section as a reference point when tuning, then folded the tip over at that point, held in a loop by another piece of heat-shrink tube so it was easy to slide & make adjustments. I found this unnecessary as it was under 1.5 across the 20m band, also to my surprise, my usual S7 to S9 noise floor reduced to S3 to S4 at the low end of the band & S5 to S6 on the higher part, I heard quiet a few stations out there, but most were running pile-ups which I doubt I would have broken through with my X6100 on 5w (internal battery powered), I will try for some reports during next week. I am surprised at how well this antenna is working so far.

I built one for the VHF aviation band. But used coax (RG58) only for the counterpoise (54cm) and the coil (11 turns on a 26mm former) and spliced/soldered (59cm) PVC jacketed 14 gauge (AWG) for the driven element. Countepoise and driven element taped to a 13mm PVC pipe for operation. Low SWR of 1.08 at 120MHz remaining below 1.5 between 118.5 and 122MHz. Gonna do a repeat for 6 meters later this year

Very cool!

I made some Yesterday Matt works well and fits in the Rucksack! I made them for 4, 6, 10, 17 & 20 all work fine I also tried as Peter suggested but the ferite adds weight

@williampeacock9473

2 жыл бұрын

Could you send me the plans for them all I would definitely appreciate it very much. My name is William Peacock AE4OY .73

Nice attempt. I would caution against mounting a half wave vertical much above 10 ft agl as any higher will begin to reduce gain at low angles on HF (for dx). I have made versions for 20,15,10 and 2m on my channel. 73

hi, just built this kind of antenna for 6m and use a 6m fishing rod 10 days ago. Instead to strip cable I use 1mm2 wire. I tuned cutting wire and moving the coil ... it is a great antenna compared the cost.... .... now looking for a more then 12 m fiberglass rod.

Top vid Matt

Mat: I just finished a ten meter T2LT, but with RG-11 as I had a spool end on hand. It's used for long cable TV runs locally, and the partial spools are available free or cheap. I ran out of dry weather and will be testing it Saturday (November 12, 2022). I will comment here when I see how it plays... De WB2VUO here near Buffalo, NY

Really nice video I’m curious did you do any type of calibration on your analyzer after you got it in the mail or was it ready to go as soon as you received it

The late Robert Victor, VA2ERY of Miracle Antenna fame sold back around 2010 a “mixed mode coax dipole” as he called it that he made from RG-174u with a ferrite common mode choke. It was fundamentally exactly like this. He terminated his antenna with a BNC connector. The key thing to be mindful is the common mode current must be choked off, and the antenna Is resonant to single band use only.

@TechMindsOfficial

2 жыл бұрын

Thank you for sharing this information 🙏

You can save yourself 5m of coax if you solder a piece of standard insulated wire to the end of the coax center conductor instead of stripping 5m of shield away. Good to see people still using flower pot antennas these days though. I use one on 2m Another interesting video Matt

@TechMindsOfficial

3 жыл бұрын

Thanks Paul, my first experience of these types of antennas was when I made a 70mhz antenna, worked pretty well. Interesting idea about soldering a piece of wire instead of stripping the coax, I wonder how critical the wire type would need to be, velocity factor etc. Might have to experiment some more! Cheers

@homebrewham2786

3 жыл бұрын

i was just thinking of using a 10m rg58 patchlead with a soldered 5m end? hmmm

@MattHeere

3 жыл бұрын

​@@TechMindsOfficial Velocity factor is only a thing for transmission lines. Once you're down to a single conductor it's not applicable any more. Using a different wire than the coax center for one end of the dipole will work just fine. It'll have slightly different inherent capacitance than the center of the RG58, but you have to cut it resonance by trial and error anyway so it won't make any difference in the end. The difference in required length between using copper plumbing pipe or 30AWG aluminum wire will only be a centimeter or two.

Hi Mat I have built 2 of them 1 for 2m and the other for the uk CB band both work well field testing them at moment along with a new super antenna MP1 M7CVK

i built a set of these these about 40 years ago - i still have them - 6/10/20/40(needs a big tree) - they just work

Hi Matt, what amp are you using with the HL2?

Hello Fellas,thanks for sharing this design, it works fantastic, would you have the measurements to build one for the 15m band?Thanks

World's simplest antenna, just one piece of coax! I don't think I've actually seen anyone do this before but a lot of little Wi-Fi antennas are made this way.

Pretty cool, a 20M version of an old end fed dipole. It relies on the common mode currents flowing on the outside of the shield and that coil as a choke to "end the antenna". I built one years ago, but used a ferrite toroid instead of the huge coil. Employed it as a tilted dipole fed from the end... Enjoy your vids. de wb7ond

@juststeve7665

Жыл бұрын

A Dipole is not end fed. Di Pole..... End fed is a monopole

@lmaoroflcopter

11 ай бұрын

​​@@juststeve7665no Steve. Its a dipole. Electrically exactly the same. You're confused as you're assuming the antenna is grounded at the physical feedpoint. It isn't. Current flows up the coax, the shield ends, current flows down the exterior surface of the shield and is prevented from being grounded by the choke. It's all radiator. It has two poles. A monopole antenna is half radiator, half ground. This is not the case here. If you need further information I suggest you look up sleeved dipoles, they're used for reference measurement work. To quote one of the data sheets: "These antennas are truly omnidirectional antennas, having an electric dipole pattern approaching that of a half-wave resonant dipole with typical gains between 1.5 and 2.0 dB. The sleeve dipole design allows the antenna to be end-fed to avoid cable and feedpoint interactions that interfere with the performance of the antenna. Integral quarterwave chokes and/or ferrite loading (depending on frequency range) also help to reduce cable interaction. This design also provides exceptional symmetry (typically better than 0.1 dB (0.2 dB peak-to-null)) to meet or exceed CTIA criteria for ripple test antennas."

You will find that is an upscale version of most 2.4GHz coaxial dipoles inside those plastic covers on your WiFi router :-) The choke (24t on the former) isn't usually critical.

I made a VHF/UHF of this type of antenna for 70cm and 144 MHz works well.

Nice to see you are getting on well with the HL2. Maybe you could do a review of that mast too as it looks useful but a bit too expensive for an impulse purchase! The spec suggests it could be used for a medium sized yagi (6m 5ele maybe), presumably when guyed, but don't know how that would pan out in reality?

Great idea and brilliant video, just cant afford that mast and would never get it past the QTH Commander!

What livestream channel is mentioned in here? I’m having a hard time finding it. Thx!

Where is the link to buy this in the US? Could not tell which one it was in the Amazon store.

I’m new to this and my question is is this antenna for Short Wave listening? If so how did you get that pole erected so high? Thanks!

Hi look up flowerpot antenna, gives instructions for a 2m 70 cm antenna, it works well.

I have build the T2LT antenna for the CB band. I found the SWR variable with the position of the feed line. I mean put the feed line coax in a different spot then i saw that back in the SWR. That's not good... So instead i made a double bazooka coax antenna and that thing is a winner.

@timg5tm941

3 жыл бұрын

If adjusting the coax changes the swr it means your choke might’ve been insufficient to choke off common mode

@48pluto

3 жыл бұрын

@@timg5tm941 Roger that. But i even used two chokes. One ugly balun like most people seem to use with this type antenna and i also had a ferrite 1:1 balun in action. So yeah you are right. But i ruled that out and i don't have much confident in this antenna. Double bazooka outperforms it anyway and is the same concept :)

Well explained tutorial and demo, thanks. What would you estimate SSB power rating to be for the coax you used?

@shanerorko8076

2 жыл бұрын

Probably 300w maybe 400w real world. I think the max rating is close to 600w but you can't run at max.

Is there any concern with using RG-6 or RG-59?

You can never go wrong with a well matched dipole, if you have the room for it, vertically or horizontally. Good built, perfect result. I may build one for the 10m band, how is the coil calculated?

@paulsengupta971

3 жыл бұрын

Google "coax choke balun" or "Ugly balun". There are designs out there.

Nice antenna! Love the Hermès lite 2 footage as well.

@TechMindsOfficial

3 жыл бұрын

Thanks! I’ll have another dedicated HL2 video coming soon regarding amplifiers etc :-)

Your audio sounds great mate!

@TechMindsOfficial

3 жыл бұрын

Thank dude!

When you trimmed 15cm off, what was the SWR?

What is callsign around 7min30 sec ? thanks

A ten metre fibreglass pole in an urban garden in the UK? Lucky chap, you have nice neighbours because if I did that I could expect a visit from the council within a week.

@M5JFS

2 жыл бұрын

I have a 9m pole 1m off the ground on a tripod stand at the bottom of my garden. I attached a windsock/flag thing to the top to make it look not like an antenna 🤣

Is your form 60mm OD or ID? I'm trying to figure out an equivalent over here in Canada. All our pipe is in inches. Thx, Brent VA7HUM

Built one out of curiosity. Does great, as good or slightly “better” than the many half wave wire verticals (w/49:1’s) i’ve put up, but with lower swr and no radials

Muito interessante antena bom impedância dela amigo

This looks like a flowerpot antenna I built for 2m when I first got my tech back in 2017...great video and thanks for sharing...I may give this a try sometime. :-D 73 KN4FTT

Built a t2lt for 11m a week ago same design it works very well was surprised 7m of coax and a £25 KIT POLE IT GETS ME FROM THE MIDLANDS INTO EUROPE NO PROBLEM 40WATTTS NEARLY A thousand miles

@paulsengupta971

3 жыл бұрын

The 12m and 10m bands have recently sprung into life big time, so I suspect it's the same with the 11m band. Enjoy!

@shropshireladoutdoors743

3 жыл бұрын

@@paulsengupta971 alot of people have taken there ham licence in lockdown so there has been a resurgence in cb 11m and the ham bands

@paulsengupta971

3 жыл бұрын

I was referring to the propagation, but yes, a lot of people have got into it, or got back into it over the past year and a half.

@shropshireladoutdoors743

3 жыл бұрын

@@paulsengupta971 the reason for that is we are going towards a peak in propagation its should rise two to three years and then die of again

@juststeve7665

Жыл бұрын

lol the antenna doesn't get you there... Ionospheric propagation does. Literally any functional antenna will do this

How critical is the number of turns and size of the choke

Hiya just found your on KZread form where your live it's looks like where I used to live could be there same place maybe they same flat

Great video, mini600 is great too. Thanks.

How did you terminate the top for hoisting or connecting to your pole?

@TechMindsOfficial

2 жыл бұрын

Think I just taped it to the top of the pole using electrical tape.

What an awesome antenna indeed, Thank You for your review, 73s 😀

Another excellent video my friend

Excellent ant for 20m if you cannot fit radials in, I myself use a 5m painters pole with radials, less height not seen as much, and I have just recently added a parasitic reflector, and boy does it work, especially for long distance dx , 10,000k and more. Thanks 73 zl3xdj

Would this work as an end-fed horizontal antenna or is it only designed to operate vertically?

@TechMindsOfficial

2 жыл бұрын

I think its designed more for Vertical use. If you need an end fed, look at using a 49:1 transformer

Its a centre fed vertical dipole. So there!!

How would it work on other bands with a tuner?

@timg5tm941

3 жыл бұрын

It won’t (very well)

I made this antenna over the weekend and used it today to activate my first park with my Xiegu G90 running 20 watts. Longest contact was 900 miles. ALL of my contacts were to the west or due south. Is this antenna directional in any way or was this likely a function of the band conditions?

@TechMindsOfficial

Жыл бұрын

Awesome! Don’t believe it’s directional, so possibly band conditions depending on your location. Good job!

Nice one matt. Tim G5TM also made a video on this fairly recently. I believe it wouldn't be too difficult to phase 2 of these for some useful gain & nulling out QRM. I already have have the phasing kit. At most a matching circuit would be needed at the phasing relay box.

@timg5tm941

3 жыл бұрын

Really looking forward to that once Colin - I take it you are looking at quarter wave distance or half wave between them? I might try that for 10m to see the front to back.

@MM0OPXFieldRadio

3 жыл бұрын

@@timg5tm941 I will initially try 1/8th wave then 1/4 wave if the former doesn't work. As Justin explains and as I understand it, the phasing/delay line lengthsbhave a direct realationship to the spacing and not the type of antenna.

what is power capability, can i use it QRO ? over the 500 W. ?

@davidw460

2 жыл бұрын

Hi - just my thoughts - confirm the coax cable’s basic power rating for the frequency and then perhaps improve the basic common mode choke if you want to go QRO.

Do you have any videos on the NanoVNA? Played with the new toy, but no joy. Needs the expert,Matt, to explain it to us all 😁

@TechMindsOfficial

3 жыл бұрын

Thanks Mike, I don’t think I do, not dedicated videos anyhow. I’ll add it to the list! Cheers 😃

QSO from G to ON? That is a local QSO that should be possible on a bit of wet string!

Well, I am having a conversion (imperial to metric) crisis; in that a 68mm diameter does not have an equivalent imperial size. I am looking at either a 60.3mm or a 75.2mm diameter. That translates to a 2" or a 2.5" standard drain pipe. How does that change the number of turns needed to electrically lengthen the antenna? It has to be different doesn't it? I dunno because I am not well versed or learned in Antenna science and lore just yet. I am however, a patient old(er) padawan. Please help me Obi Wan...

@joewoodchuck3824

2 ай бұрын

If you use a similar amount of wire you'll be fairly close anyway.

how much power it can tolerate?

@rms8698

3 ай бұрын

With RG58, probably around 300 watts on SSB. If you use RG8-x, it can withstand double or more watts. Using thicker coax such as RG213 with length for 20 meter band, will be very heavy.

A vertical half wave dipole it is

Why not simply solder a 510cm solid core wire to the centre wire of the coax, and save both money and time?

Can you make one for 40m

Firstly, mate 17 meters of coax isn't cheap but neither is that 50' Moonraker pole! Cost more that my G90 that I got on sale. LOL. Since I am not skilled yet in antenna what would it take to do 28.3 to 28.5MHz? That's my lot in HF land until 12 August when I will pass my General and spread my HF wings. Love to build one and report back what happened.

@TechMindsOfficial

11 ай бұрын

RG58 is probable the cheapest you can get. But please, let us know how you get on! I believe there are plans out there for use on 10m, maybe I will make a video on it..

Made one last year does perform pretty good, not much difference between this and a Antron 99.

its also called a flower pot I have them for 2m 4m and they work ok.

@TechMindsOfficial

3 жыл бұрын

I also made the 4m version, works just as well as a commercial 4m vertical.

This is very useful. Is there anything like hf vertical all band antenna with out radials ?

@timg5tm941

3 жыл бұрын

Yep vertical doublet. 25 feet plus for 20-6

@prorover591

3 жыл бұрын

@@timg5tm941 thank you Tim. I have subscribed your channel too. As a beginner I am learning from other hams and that makes me feel good.🙂😇

@paulsengupta971

3 жыл бұрын

The problem is that to get an efficient antenna on the lower bands, you'd need a very tall insulated pole/mast. While a smaller antenna will work (maybe with a tuner) it might be better to create some sort of inverted V.

What is the software for the analizer and where do you download please ps love the vid thankyou

Great stuff , would it make any difference with the quality of the coax ?

@MauriatOttolink

3 жыл бұрын

Aaron will i am... Over a short distance, very little difference would be seen... 1/4 mile grotty coax, yes.

Had a go at making this today, I only had pipe about 40mm in diameter? SWR was off the scale, I was under the impression it was the number of turns not the diameter. Can you enlighten me please?

@TechMindsOfficial

3 жыл бұрын

Smaller diameter would mean more turns. Not sure how many more, but if you have an analyser it would make life easy.

@leybald60

3 жыл бұрын

@@TechMindsOfficial I have a NanoVNA. I'll try a few more turns

@TechMindsOfficial

3 жыл бұрын

Cool, let me know how it goes

@paulkazjack

2 жыл бұрын

@@leybald60 How'd it go??

@leybald60

2 жыл бұрын

@@paulkazjack I lost interest and instead made a 14mhz/20m centre fed cage dipole, three lightweight lengths of wire separated by some plastic drainpipe cut into thing slices as spacers. It has a 1:1 balun at the feed point. I've worked a lot of stations worldwide on SSB and FT8 using QRP power of 10 watts. SWR is 1 to 1.1/1.2 across the band due to the increased bandwidth the cage effect gives. No ATU necessary.

Nice to see you use the hl2 :) Can'tget mine to transmit, no rf output even with drivers all up etc nor sure what it is. Maybe somethong for a video ? The t2lt is nice and simple. Made several of them, dedicated monoband antennes alway work good for me.

@davidw460

3 жыл бұрын

Hi - sorry it didn’t work for you ! First thought is to check the antenna is not shorted ( an Ohm meter connected to the coax connector should read open circuit).

@joeripe5jw

3 жыл бұрын

@@davidw460 found the problem. 😞 Forgotten to Power the watt meter, oeps. Tune gives me 5 to 8 Watt but audio is very distorted and low gain. Explained why nobody responded on my calls. Haven't solved that yet must be also configurstion mistake. Antenna is a 3 band high-endfed no problem with that on my ft950.

I try it yesterday , 9 Meter fishing pole but failed it, swr is 2.1 and RX is very bad, i dont know problem

@TechMindsOfficial

2 жыл бұрын

I’ve currently got mine up on a 12M pole and working UK to USA everyday

Im absolutely amazed by how is your SDR Console set to display that high resolution of received signal! Could you make an instuctional video about SDR Console please?

Flower Pot Antenna

I wonder if I could make a dual band 20 and 40 meters antenna with this

Its described as a vertical dipole, so one would asume it could be used horizontally? like say a traditional centre fed. This is cheap as chips so defo worth a try.

I just made this antenna, but instead for 15M and wound the coax around a large ferroid choke. Waiting on the mast to arrive and then I'll be putting it up! I also took Peter G3OJV's suggestion and soldered a solid wire at the end of the coax instead of stripping off all that dialectric.

Will they work horizontal ‽?

@BFOlivier

2 жыл бұрын

Yes, but maybe better to made a classic dipole

wonder how it would work in a horizontal configuration?🤔

@timg5tm941

3 жыл бұрын

Same as a horizontal dipole although the weight of the bottom half of the coax might be a tad strong

What is a centimeter in inches?

I tell what’s cool about this antenna , no ferrite 😳

@chris6955

3 жыл бұрын

I agree ferite is heavy and fragile. These are great for portable along with my 12m spirit of air pole

A common mistake is for people to use the formula 234 / frequency in megahertz for their measurement of both the top and the bottom half, which results in a too Short antenna and an antenna that tunes higher than anticipated. The reason for this is because End Effect is employed in the formula 234 / frequency in megahertz - ONLY for the top quarter wave since the bottom quarter wave is terminating at a choke. There will be no End Effect therefore the bottom half should be the full quarter wave or 108 inches for 11m CB use whereas the top half will end up tuning best somewhere around 103 inches for center of the USA 11m CB band.

@furion..

Жыл бұрын

The same holds true for any other band T2LT.

Could you make a 40 meter version? Mike KJ7GEU

All i lack here is the 400 pounds for the mast.... And who knows on shipping to TN USA Problems....

That is NOT a vertical dipole! Sorry to break the news. To be a VD it needs an element outside the coax for 1/4 wavelength and tied into the shield at the pint where the inner coax element goes up 1/4 wl. I build them this way using the coax shield pulled down around the coax. To do that on lower bands so far intimidates me. I may try it with copper tape though. Some call this a Flower Pot design. It needs no Coils at the bottom.