2 4GHz Single Turn Double Helical Antenna

[@rctv-uk3126]

Loving these videos Andrew!

[@andrewmcneil]

RCTV-UK My pleasure, thanks for the feedback

[@jmitsch44827]

What was the specific name of the SMA connector. Was it a panel mount SMA? And what gender? The plastic cap idea was absolutely brilliant!

[@KaspersMC]

Good work as always :)

[@SladkaPritomnost]

Great! I haven't heard of single turn 2xhelical before... :-) What is its beam angle? Is it wider than standard 3 turn helical? I'm looking for something wider with lower gain.

[@AlysonGilMorales]

Hello, it is possible to know what the calculations made for the realization of the antenna were.

[@ME-zu5kg]

Andrew an excellent video I have watched many of your builds and would ask you the following question how about a Cross hair antenna for 2.4 Ghz to be used by RC flyers? I have seen the helical but they are too directional I look forward to your reply.

[@AntonL525]

Great video! Thank you!

[@gamestv4875]

Can you give me a link or info how to calculate for different frequencies? Diameter , length etc.

[@ricaanjelisilan8167]

what is the diameter of the helical antenna?

[@PidgeyTheFluff]

Nice videos! Just one question though, for the back reflector, would it work using any non-conductive material, and use copper tape on the back?

[@eddiegrice7732]

Awesome can you multiply the turns to increase the gain??

[@fragell1]

splendid vid what you tube is all about (nice jumper dude)

[@EnglishTurbines]

Very neat and easy build. On a WiFi link, its easy to point it for max signal strength, but can we use it on a typical 2.4Ghz RC setup please, with standard linear dipoles at the RX end?...Included beam angle ? A field test would be interesting at a range of say 3kms?

[@andrewmcneil]

EnglishTurbines You should use it with a circular polarised antenna or you would loose 3db to mismatching

[@EnglishTurbines]

andrew mcneil Ah, like a clover leaf antenna maybe? How would we fit that to a typical RC reciever which uses two linear "wire" dipoles for diversity. I assume we would only then need one CP on the RX end ?

[@SladkaPritomnost]

I have just finished testing of mine 5.8Ghz, it didn't work as expected. It doesn't even beat my home made skew planar wheel antenna :( I'm a bit disappointed, this antenna looks perfect for me, mid gain wide beam... The only deviation from the original is 1.38mm wire diameter. Did anyone try single helx for 5.8Ghz?

[@MrSiciro]

Can you for example make a permanent support in the middle and for example just wind the coils around a pvc pipe

[@PhG1961]

Great video ! Very great ! Congratulations !

[@Calypso993]

why didnt you use copper for the active elements ? you always seem to have it handy at the workshop.

[@andrewmcneil]

Back in 2015 the workshop looked nothing like it does now 😁 now that I am semi retired from my full time job I do spend a lot more time and money on the workshop (don't tell Mrs Antenna😁) and have stock materials to hand . But I still prototype using steel and tin.

[@19rocket64]

Hi Andrew, does this center rather than the side feed disrupt the performance? I love form factor. Thank you

[@YorHighness]

Yep this looks like a winner Hope it exploits its radiation pattern alsol.

[@alexdavis2775]

Hi, love your tutorials. It's possible make it for 5.8 ? Is there any calculator for this kind antenna. I would try it make for 5.8 and 1.2GHz for my planes.

[@andrewmcneil]

Moje Cncing Will this help? kzbin.info/www/bejne/q2jGomitit6Yh5I

[@alexdavis2775]

andrew mcneil Hi Andrew Thank. Didn't get there. My bad :) How to make this antenna also for 1.2. Any calculations - formulas. Asking cos as I see differences in wavelength between 1080 and 1280 are quite big.

[@kotik9254]

Your template has got to be wrong: the pitch angle is almost 20 degrees (40mm spacing for a 110mm circumference), all design guides say 12 to 14 degrees is the optimum angle

[@ricaanjelisilan8167]

what calculations are made to this antenna design?

[@eswnl1]

Can having 2 helix be used for both LHCP and RHCP?

[@jijeshkorothpoyil2697]

Hi i am trying Implement esp now (normal or LR mode) for sending overhead water tank level data (Ultrasonic sensor) to the basement. But they can never work in line of sight. So I depend on reflected 2.4 ghz waves from surrounding. So i think cirular polarized external antenna will be best suited. Water tank is in second floor terrace and receiver in ground floor work area. Both can be connected by reflected/refracted wave. 1 . Is my assumptions are correct ? 2. Will the helical antenna in this bideo be the best? 3. Which is Best antenna for receiver?

[@andrewmcneil]

I converted all my security cameras to circular polarised for the same reasons (interference). Just make sure you have the same matched antenna on the receiver as the transmitter

[@OK-1K1]

NEEEEEERD!!!! nifty little built there mate

[@MrDroneinthesky]

Can you make this antenna for QO-100 RHCP 2.4ghz double helix

[@drewhodge3820]

I would be very interested if you have a link where i could find the dimensions for a 1.2GHz double helical.

[@CyclingSalmon14]

Slightly confused by this...a 3 turn single is very wide with decent gain, a 1 turn must be massive but as its a directional I guess still won't reach behind it. (I know there will always be some behind reception anyways) Now a double is going to widen that even more...what possible use will this have over say a CP style antenna.

[@EduardoPinOficial]

I've made this antenna and analyzed with a vector network analyzer. With this dimensions this antenna does not work for 2.4ghz.

[@CyclingSalmon14]

is such a thing as a quad helical possible? or would it be really ineffective?

[@mehdijabari7217]

Goooooooooood work as always thank

[@andrewmcneil]

mehdi jabari My pleasure Mehdi

[@MitjaSkuver]

Great work!

[@petejones961]

Hi Andrew would this work as an external Antenna for a Satellite phone? eg a Motorola iridium sat phone. Thanks Pete

[@noimnotarobotcanubeleiveit7024]

any good as a satellite dish feed?

[@MarkRose1337]

How do helical antennas compare to cantennas?

[@Bigrignohio]

A quick question. Is the effective gain of a dual helical antenna approximately equal to a single antenna of twice the length? I assume it would actually be slightly less.

[@kotik9254]

No, it gives a slight increase of about 1.5db over a single helix but no loss of beam width.

[@Bigrignohio]

Kotik Increase of 1.5dB over the single of the same length of the dual, or of the total combined length of the dual? Thank you.

[@allanwatson4067]

Nice one, Thank you

[@andrewmcneil]

Allan Watson My pleasure, thanks for the feedback

[@dennydo6397]

will this work for the front end on a satelite dish horn to receive wifi 2.4ghz

[@XRinger]

The number of turns (gain required) depends on the type of dish used (distance between dish center to focal point and dish diameter) . I used a single 3 turn helix feed on an old 10.5 ft TVRO dish. It worked fine for 21 cm line (1420.4 MHz) used for Radio Astronomy and SETI projects. If you don't use enough gain in the feed, the back-ground noise from behind the dish will be picked up.. Too much gain will work, but at reduced dish gain.. Because you aren't using all of the dish surface. I once used a coffee can feed on 1296 Mhz to listen to EME and on 1295ish for OSCAR comms.

[@zerobow9413]

Need to put it on a VNA dude

[@WandersOfficial]

Would this be better with copper coils.?

[@michaelhayes7849]

What type of energy harvesting can this design allow for? I'm sure it is in the low miliamps yet it should offer some form of trickle charge especially if deployed in mass.

[@Bigrignohio]

Hm, 34mm is just SLIGHTLY greater than the OD of 1" pvc pipe. A few wraps of tape should bring it into spec. The joy of living in the only large country using the old English measurement system!

[@ManuelPinner]

Terminated Double Hilex Antenna