Home Forums Everything about everything else Using SMA extensions for 5.8 ghz FPV

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  • #22103
    wynnsquad
    Participant

    Hey guys,

    In a recent crash, I ripped the sma connector from my vtx. Luckily I was able to repair it, but i’m wondering if in the future, I should get an extension to my antenna so that in a crash I don’t just snap it off again. Does anyone know if using an extension would cause performance to suffer?

    #22118
    donnyb
    Participant

    I use a sma extentions on all my stuff. I don’t really see much difference on the transmitting side of things. I don’t know the actual number of signal loss I think it was .5 db per connection. If your transmitting with .25 mw, it could suffer a bit. If your transmitting with a 200-600mw it would be impossible to see a difference. On the receiving side of things is a different story. If you have a antenna with 3 db gain And you lost 1 db of gain you lost a 3rd of your reception. Say for instance you wanted to have a antenna on a 10 foot mast you lose the 1 db in connectors and 2 db in wire you lost all the gain from your antenna. That might be a little more information your looking for. But getting in the ball park with how the transmission and reception how it really works will help you out in the future.

    #22177
    wynnsquad
    Participant

    Cool thanks donnyb!

    That’s exactly the info I was looking for.

    #22209
    Kevin
    Participant

    See, for us Americans, the ones that don’t want to get a ham radio license because they think it isn’t useful and a stupid license to have just for this hobby here is a great example of where it will come in helpful. Part of getting the ham radio license is learning some basic antenna design.

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