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Thread: CPATCH12: The most compact long range 1.2GHz antenna

  1. #381
    As I like to make stuff and save some cash along the way, I thought I'd build a CPATCH12 clone.





    I do believe it's built well??? as the video at times is fantastic!???
    And I've seen some that are hacked up and still work well?
    I'll post the video soon. :-(

  2. #382
    Here's the video...

    If anyone has any ideas????
    Please help????

  3. #383
    Navigator ABL's Avatar
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    Well...
    Hm, you probably messed up distance between ground plane and patch with 3D printed stuff and reversed backplate. Hard to tell without measurements, but this antenna isn't very wideband - so need to build precisely.
    Try to reverse ground plate (foil should look inside); also, which antenna on plane?

  4. #384
    Hi ABL,
    Thanks for the reply...

    The distance is a perfect 15mm as detailed in the website I got the drawings from...
    http://lag.lt/cpatch12-dimensions-and-details/
    The original patch from CW has the copper foil facing rearward and I stuck to the dimensions exactly.

    The ground plane is connected to the ground element of the coax cable...

    I actually think I have found the problem. Look at the video and it's fine until I move the plane....
    On the bench, I removed the 5.8 relay and plugged a monitor into the VRX.
    Great picture but when I picked up the plane... the image went bad again...
    I then played with my leads in the model and I got the picture to go from good to bad to all gone and back again...
    I am convinced that the issue is actually the leads...???
    I could of course be wrong but I am making a new lead set up and I'll report back...

    Thanks again.

    David.

  5. #385
    Co-Pilot Håvard Støre's Avatar
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    Jul 2014
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    Norway, West coast
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    Just bought myself this gem of an antenna. I will continue to use my Pepperbox, but plan to use the Cpatch12 as a portable groundstation for hiking trips.

    Just one question.... Do I need to raise the Cpatch12 on a tripod, or will it work just as well close to the ground.

  6. #386
    Lovin life... HFMan's Avatar
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    It works excellent close to the ground... mine is usually less than 2 feet off the ground. I think it actually works better closer to the ground.

  7. #387
    Co-Pilot Håvard Støre's Avatar
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    Quote Originally Posted by HFMan View Post
    It works excellent close to the ground... mine is usually less than 2 feet off the ground. I think it actually works better closer to the ground.
    Great man:-) I will use it this evening to fly my HC44 up and down a mountain on the opposite side of a fjord. I am always scared when flying across the salty stuff on a new location. Especially with no osd or ap.
    Last edited by Håvard Støre; 5th May 2017 at 11:26 AM.

  8. #388

    Update on my problems....

    It seems I have multiple issues with my system.

    1st, The RCA sockets on my VRX were loose, I got some new sockets from RS and that solved some of the video breakup.
    Then I found a video on youtube about almost the same problems I am experiancing...

    It turns out the the RCA sockets on the tracker are also crap... If I just lightly touch the lead from the VRX to the tracker, I loose all signal.

    Again, I swapped them for better quality parts and bingo! No more loss of connection.... and I got my first 1k flight....
    Looking good, however.... Looking over the DVR footage from that flight, I still have interferance and some quick "black frames"???

    Going to look at the wiring and filtration again....

    But it's getting there.... I think......

  9. #389
    Hi Folks,
    Sorry I've not updated this in a while but here's a video of my latest flight.
    I got to 4km out and came home...
    Unfortunately, my DVR has developed a problem now so I'm in the middle of fixing that...
    What you see here is from my Runcam2 but it's more or less what I see in my goggles.

    So, with all being said, I am over the moon at the results of making my patch... :-)

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