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Thread: dipole on ezuhf diversity

  1. #1
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    dipole on ezuhf diversity

    Hi alex, ive tried searching the forum for info regarding this i currenlty fly a tbs disco on ezuhf 433 mhz band and have the 8ch diversity ive always had 2 sander style mono antennas on it always flown well no failsafes etc, but recently ive aquired 2x ib crazy 433 dipoles of yours is there any advantage to change one mono for one dipole on my diversity even though it flies great rc link is solid im planning a long range flight with it thanks for any help recieved alex keep up the good work mark

  2. #2
    Engineer for Jesus Christ IBCrazy's Avatar
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    If you are not having any issues, I don't see a reason to change over other than peace of mind. The dipole simply helps correct issues that are common with the monopole such as increased noise sensitivity. However, if your aircraft does not have any problems with this, then I probably would not bother making the switch.

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

    videoaerialsystems.com - Performance video piloting

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    oki doki alex thanks for the quick response...

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    If you go Dipole on diversity is it best to use two or can you use one of each as described, but not implemented above? I.e. what is best.
    Also, I've had issues with noisy NAZA in the past on 433 IRC 8ch diversity. I've copper taped everything and shielded, etc but haven't gone far away yet. The IRC software says I'm at about 93 dbi in my house ready to fly. I'm a bit paranoid now.
    WIll a dipole help reject that noise, or the noise is on 433 and a dipole will just amplify it?
    Thanks!

  5. #5
    Engineer for Jesus Christ IBCrazy's Avatar
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    I recommend using two dipoles for best results. However, many cannot fit two dipoles, so a monopole and a dipole combination works fairly well also.

    A dipole *might* help reject noise. A full dipole will only help with RFI, not EFI interference.

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

    videoaerialsystems.com - Performance video piloting

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    I am building an anaconda soon. I want to use 2 dipoles on my ezuhf diversity rx. Does it matter how far apart the 2 dipoles are?

  7. #7
    Engineer for Jesus Christ IBCrazy's Avatar
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    Quote Originally Posted by yappy View Post
    I am building an anaconda soon. I want to use 2 dipoles on my ezuhf diversity rx. Does it matter how far apart the 2 dipoles are?
    Yes. Farther apart is better. Think of a Yagi antenna. Avoid that structure

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

    videoaerialsystems.com - Performance video piloting

  8. #8
    Quote Originally Posted by IBCrazy View Post
    Yes. Farther apart is better. Think of a Yagi antenna. Avoid that structure

    -Alex
    2 di-poles side by side in a EZUHF Diversity RX in a multi-copter application, where room & positioning is limited, has been reported to work very well.

    EDIT: Look at the picture in Post #144 in this thread of di-pole discussion: http://fpvlab.com/forums/showthread....-dipole/page15
    Last edited by ZACATTACK; 18th December 2014 at 12:07 AM.

  9. #9
    Engineer for Jesus Christ IBCrazy's Avatar
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    ^Call it luck on the installer's part. I actually made some empirical measurements on that one. However, most times a nearby element will be detrimental if in the same polarization.

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

    videoaerialsystems.com - Performance video piloting

  10. #10
    Quote Originally Posted by IBCrazy View Post
    ^Call it luck on the installer's part. I actually made some empirical measurements on that one. However, most times a nearby element will be detrimental if in the same polarization.

    -Alex
    How is this bad if both antennas are just receiving independent of the other?

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