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Thread: EzUHF or Crossfire with 1.3Ghz FPV and Vector gps?

  1. #1
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    Question EzUHF or Crossfire with 1.3Ghz FPV and Vector gps?

    Hello guys, I'm planning to build a wing for mid range flying that also has good penetration behind trees and obstacles, I ended up choosing 1.3 as 2.4 wasn't a viable option in a messy RF environment such as London.
    I do have both EzUHF and Micro Crossfire modules and I understand the latter might have some issues with 1.3.... what would you guys advice to use for my RC considering I also intend to put a vector on this platform?

  2. #2
    Navigator schugabe's Avatar
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    Since you have both it should be "easy" to simple test it out. You can put the RX next to the VTX and check on the ground what kind of range you get in the range test mode (or with an attenuator on the tx).
    With the analyzer mode of the ezuhf it's easy to check for noisy components on the wing on the ezuhf band. I don't know if crossfire has a similar test mode.

    When you say London do you mean "in the city" or where do you fly here?

  3. #3
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    Yeah quite central, we got 2 parks that allow RC flying, of course no long range there!
    Thanks for the tip!

  4. #4
    Navigator schugabe's Avatar
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    Then I'd take the ezuhf rx to the flying field with a laptop attached and measure the noise floor there. If the uhf band is clear it's certainly a good option.

  5. #5
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    I have a crossfire nano( immortal t) setup with 1.3ghz(1000mw).
    Works fine but i do have them almost 36” apart. I havent flown past 5km, with this setup. But do get great results, mainly mountain flying here in southern alberta.
    Xl raidan glider and custom 48” flying wing..
    Just have to keep the 1.3 far enought away from the crossfire

  6. #6
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    Quote Originally Posted by captain awesome View Post
    I have a crossfire nano( immortal t) setup with 1.3ghz(1000mw).
    Works fine but i do have them almost 36” apart. I havent flown past 5km, with this setup. But do get great results, mainly mountain flying here in southern alberta.
    Xl raidan glider and custom 48” flying wing..
    Just have to keep the 1.3 far enought away from the crossfire
    I use an inter-digital filter and don't really need any more than a decimeter or so but separation is a lot easier if you use a relay (which I also use). Cheers to Alberta pilots.

  7. #7
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    Quote Originally Posted by Gains_FPV View Post
    I use an inter-digital filter and don't really need any more than a decimeter or so but separation is a lot easier if you use a relay (which I also use). Cheers to Alberta pilots.
    Apology for my ignorance but how do you use an inter-digital filter??

  8. #8
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    Quote Originally Posted by Atomic View Post
    Apology for my ignorance but how do you use an inter-digital filter??
    You have to make one or buy one (expensive). It is a low loss (-0.25dB) band pass filter that in my case filters anything outside of the ham band by -60dB. You put it in between the antenna and the Rx. Pretty much cuts the crossfire out of the equation. Essentially it is doing what the 1.3 GHz receiver should be doing... filtering out of band signals. You can get smaller ceramic ones (which is what a new Rx would have on its PCB), but they have more loss. If you're really close to the Rx some of the XF makes it through the case so you still can't have your antenna right by the Rx.

  9. #9
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    [Quote = Gains_FPV; 848741] Hay que hacer uno o comprar uno (caro). Es un filtro de paso de banda de baja pérdida (-0.25dB) que en mi caso filtra nada que esté fuera de la banda de radioaficionados de -60dB. Lo pones entre la antena y el Rx. Más o menos corta el fuego cruzado de la ecuación. En esencia, lo que está haciendo el receptor de 1,3 GHz debería estar haciendo ... el filtrado de señales de banda. Usted puede obtener los más pequeños de cerámica (que es lo que un nuevo Rx tendría en su PCB), pero tienen una mayor pérdida. Si usted está realmente cerca de la Rx algunos de los XF lo hace a través del caso por lo que aún no se puede tener su antena junto a la Rx. [/ Quote]

    Hello, I am in the same need to use the filter. You could tell me where to get, buy the filter you use. I would be very grateful. regards

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