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.
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.
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.
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?
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
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?
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 ?
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?
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
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.
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.
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.
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.
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.
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.
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!
Loving these videos Andrew!
RCTV-UK
My pleasure, thanks for the feedback
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!
Hello, it is possible to know what the calculations made for the realization of the antenna were.
Good work as always :)
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.
Great video! Thank you!
splendid vid what you tube is all about (nice jumper dude)
what is the diameter of the helical antenna?
why didnt you use copper for the active elements ? you always seem to have it handy at the workshop.
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.
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.
Can you for example make a permanent support in the middle and for example just wind the coils around a pvc pipe
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?
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
Can having 2 helix be used for both LHCP and RHCP?
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?
Great video ! Very great ! Congratulations !
NEEEEEERD!!!!
nifty little built there mate
Can you give me a link or info how to calculate for different frequencies?
Diameter , length etc.
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?
EnglishTurbines You should use it with a circular polarised antenna or you would loose 3db to mismatching
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 ?
what calculations are made to this antenna design?
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?
Hi Andrew, does this center rather than the side feed disrupt the performance? I love form factor. Thank you
Can you make this antenna for QO-100 RHCP 2.4ghz double helix
Yep this looks like a winner Hope it exploits its radiation pattern alsol.
Awesome can you multiply the turns to increase the gain??
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
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.
Moje Cncing Will this help? ruclips.net/video/u7cq5wUyeQ0/видео.html
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.
any good as a satellite dish feed?
I would be very interested if you have a link where i could find the dimensions for a 1.2GHz double helical.
I've made this antenna and analyzed with a vector network analyzer. With this dimensions this antenna does not work for 2.4ghz.
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.
Hi Andrew would this work as an external Antenna for a Satellite phone? eg a Motorola iridium sat phone. Thanks Pete
is such a thing as a quad helical possible? or would it be really ineffective?
How do helical antennas compare to cantennas?
Great work!
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.
No, it gives a slight increase of about 1.5db over a single helix but no loss of beam width.
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.
Goooooooooood work as always thank
mehdi jabari
My pleasure Mehdi
will this work for the front end on a satelite dish horn to receive wifi 2.4ghz
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.
Need to put it on a VNA dude
Nice one, Thank you
Allan Watson
My pleasure, thanks for the feedback
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.
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!
Would this be better with copper coils.?
Terminated Double Hilex Antenna