Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: New 1.2 GHz antenna , RCHP or LHCP 10.5dBi, super compact

  1. #1
    Navigator Kondor-FPV's Avatar
    Join Date
    Nov 2011
    Location
    Boca Raton, FL
    Posts
    662

    New 1.2 GHz antenna , RCHP or LHCP 10.5dBi, super compact

    Hello guys,
    as I explained on other venues, I have been asked to make the popular half sphere helix in 1.2Ghz. Not the stripped down version we had before for goggle mount, which had only 7dBi of gain due to super small reflector plate, but a proper one just like our super popular 2.4ghz version of which 26,000 pcs have been sold worldwide the past year alone.

    We have not only done that but we have improved it further.
    The result is a CP antenna with a very high efficiency and a whopping 10.5dBi gain that fits in the palm of your hand.

    Quite capable of 30-40Km flights on the right gear, yet small enough to fit anywhere you want .

    The numbers are absolutely perfect. It's centered at 1200MHz with a perfect 1.0:1 SWR, and its usable range is 1120-1360 where it still has 1.8:1 SWR (at the extremes, while at 1320 SWR is 1.4:1 and at 1160 SWR is 1.1:1)

    Pre production price is set at 89$

    We've already sold 13 pieces in 24 hours as a pre-production. If you are interested you can contact us at sales@fpvlr.com or call me (Tony) at 5618432344
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	DSC_0052.jpg 
Views:	451 
Size:	120.3 KB 
ID:	68139   Click image for larger version. 

Name:	DSC_0056.jpg 
Views:	537 
Size:	152.3 KB 
ID:	68140  
    Last edited by Kondor-FPV; 21st November 2015 at 06:27 PM.
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  2. #2
    Navigator _Milo_'s Avatar
    Join Date
    Jul 2013
    Posts
    430
    Beam Width?

  3. #3
    Navigator Kondor-FPV's Avatar
    Join Date
    Nov 2011
    Location
    Boca Raton, FL
    Posts
    662
    Quote Originally Posted by _Milo_ View Post
    Beam Width?

    the real or fake beam width?

    the other manufacturers claim fake beam width numbers. For example, with this you could fly at 3 miles even behind your back, does it make it 360 degrees? No, obviously there is a back lobe of coverage and some side lobes which makes it appear so. Other manufacturers don't use the real world standard for measuring beam width to try and get more sales, but if you fly their antennas to say 60% of the range they allow, you will see the numbers are MUCH lower than they claim and instead of 180 degrees in reality they have 40 or 50 degrees.... This antennas is a true 70 degrees beam width at -3dB which is exceptionally good for a 10.5dBi directional antenna. This means that once you are out of the area of coverage afforded by the side lobes which make it appear 180 degrees, then of course the main lobe is the one we are relying on to carry the signal, and that's the one that should be measured at -3dB . As you approach the very limit of ANY directional antenna, beam width becomes smaller and smaller until it reaches 0 and you have no more signal. 20+ miles are possible with such a tiny CP antenna which is quite nice!
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  4. #4
    Lovin life... HFMan's Avatar
    Join Date
    Jan 2014
    Location
    Colorado Springs, CO
    Posts
    1,943
    How about radiation plot? Some other manufacturers at least show the numbers on a chart.

  5. #5
    Navigator Kondor-FPV's Avatar
    Join Date
    Nov 2011
    Location
    Boca Raton, FL
    Posts
    662
    Quote Originally Posted by HFMan View Post
    How about radiation plot? Some other manufacturers at least show the numbers on a chart.
    the antenna was tested in anechoic chamber and all data was posted nearly 2 years ago when the 2.4Ghz version came out.
    All we did was scale it up to 1.2Ghz by doubling the dimensions and of course it was tested on a spectrum Analyzer but not in an anechoic chamber.

    The first version of the Half sphere had 2 less turns compared to this one and was almost 9dBi gain here you can see the 3d radiation pattern. The 2 extra turns add 1.5dB of gain on top of that.

    Like I said this is our most successful design with 26K units sold world wide in 1 year time... with great reviews and satisfaction.

    Mostly used on 2.4Ghz wifi enabled drones, DJI lightbridge and lightbridge2 , and on RC radios used for FPV, so Futaba, Spectrum, Frsky etc.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	2.4AnechoicChamber.jpg 
Views:	229 
Size:	145.5 KB 
ID:	68156   Click image for larger version. 

Name:	2.4ghz half sphere.png 
Views:	264 
Size:	67.8 KB 
ID:	68157  
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  6. #6
    Navigator Kondor-FPV's Avatar
    Join Date
    Nov 2011
    Location
    Boca Raton, FL
    Posts
    662
    The antenna is now available for purchase here
    https://fpvlr.com/store/product/10-5...helix-antenna/
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  7. #7
    Engineer for Jesus Christ IBCrazy's Avatar
    Join Date
    Mar 2011
    Location
    Amherst, VA
    Posts
    7,352
    This looks really good. Do you by chance have the axial ratio plot? I see a rather large lobe out of the back (which is typical of helicals). The question I have is how usable that rear lobe is.

    -Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  8. #8
    Navigator Kondor-FPV's Avatar
    Join Date
    Nov 2011
    Location
    Boca Raton, FL
    Posts
    662
    Quote Originally Posted by IBCrazy View Post
    This looks really good. Do you by chance have the axial ratio plot? I see a rather large lobe out of the back (which is typical of helicals). The question I have is how usable that rear lobe is.

    -Alex
    It's so usable you won't believe, it's not just a back lobe but it gives you a feeling of 360 degree connectedness when flying close it.
    not only that's the older half sphere, the new one with 2 more turns has a smaller rear lobe.
    Suffice to say Alex , we sold over 2 million $ worth of just the 2.4ghz half sphere around the world in 2015 alone!
    You'd think that rear lobe is working well with such numbers!
    That half sphere is on every drone specific kit we built, for P2, P2V, P2V+, P3s, P3A, P3P, Inspire-1, Solo, Yuneec q500, Yuneed Blade Chroma.

    Also it's on many 2.4ghz radios for rc range! the best thing is the ease of aiming, as I said it feels 360 degree coverage if you are close in, for some drones like P3 or I-1 close in means 1 mile, so you can fly 1 mile around you and not have to aim.
    When you aim, great things happen like in this photo
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	8.5miles.jpg 
Views:	226 
Size:	123.6 KB 
ID:	68589  
    Last edited by Kondor-FPV; 8th December 2015 at 05:09 PM.
    www.fpvlr.com - Home of your favourite Custom FPV antennas.

  9. #9
    Navigator TurboCinqy's Avatar
    Join Date
    Jun 2012
    Location
    Tiel , The Netherlands
    Posts
    56
    Double post...
    Last edited by TurboCinqy; 19th April 2016 at 10:17 AM.

  10. #10
    Navigator TurboCinqy's Avatar
    Join Date
    Jun 2012
    Location
    Tiel , The Netherlands
    Posts
    56
    Hi,

    I'm trying to make some 1.3 halfspheres.
    Like you said a smaller reflector gives less gain.
    No or big center hole makes no difference.
    Only the outside of the reflector diameter.

    So now I also tried to add 3 lower turns (total of 8turns) beneath the halfsphere.
    Result is over 1dBm loss instead of more gain.
    Also the angle looks smaller.

    Vswr is fine so that isn't the problem.
    Everything else is the same.

    For the normal halfsphere I tried several types of wire but that doesn't have much influence on the output itself.
    Last edited by TurboCinqy; 19th April 2016 at 10:19 AM.

Similar Threads

  1. Interference testing: LHCP vs RCHP
    By IBCrazy in forum IFR - Video Link Discussion
    Replies: 2
    Last Post: 2nd October 2014, 02:26 PM
  2. New SharkTail compact UHF antenna for micro quads
    By SecretSpy711 in forum PILOT'S LAB
    Replies: 31
    Last Post: 12th March 2014, 07:52 AM
  3. LHCP helix antenna for DJI PHantom V2
    By Kondor-FPV in forum FPV Long Range
    Replies: 0
    Last Post: 13th February 2014, 11:48 AM
  4. Super compact GS w/ tracking and diversity
    By imagebuff in forum IFR - Video Link Discussion
    Replies: 28
    Last Post: 22nd November 2012, 03:30 PM
  5. My New 8.5dbi Helical Antenna (DIY)
    By Derek_S in forum DIY
    Replies: 3
    Last Post: 2nd March 2011, 12:21 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •