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Thread: 3rd LNB blown in under two years

  1. #16
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    Quote Originally Posted by dcapper View Post
    I'm going to try that. I was looking in the box that I received my lnb in. What is the fibreglass plate used for? I've never installed it.
    it's for a power surge...hmmm

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  2. #17
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    Quote Originally Posted by dcapper View Post
    I'm going to try that. I was looking in the box that I received my lnb in. What is the fibreglass plate used for? I've never installed it.
    its to convert linear signals to circular signals....

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  4. #18
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    it's probably a flat scalar ring and is for maximizing signal quality and attenuating undesired interference

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    Quote Originally Posted by dnasp002 View Post
    it's probably a flat scalar ring and is for maximizing signal quality and attenuating undesired interference
    no its a Dielectric plate, Dielectric plates are used to convert linear polarized signals to circularly polarized signals.

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  7. #20
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    Dielectric plates are used to convert circularly polarised signals to linear polarisation. They work by utilising the difference in dielectric constant between fibreglass (or teflon) and air.plate_dsc_0330.jpg

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  9. #21
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    Quote Originally Posted by steveOtoo View Post
    Dielectric plates are used to convert circularly polarised signals to linear polarisation. They work by utilising the difference in dielectric constant between fibreglass (or teflon) and air.plate_dsc_0330.jpg
    use that plate everyday on my 12 footer. works good for a few south american satellite 47W, 40W etc must be used to get signal... here in north america for C band it converts linear to circular....
    Last edited by sonicmario; 06-29-2020 at 06:42 PM.

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  11. #22
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    Quote Originally Posted by sonicmario View Post
    no its a Dielectric plate, Dielectric plates are used to convert linear polarized signals to circularly polarized signals.
    it's been a long time since I played with a c band dish, wasn't aware that they were even broadcasting circular

    we used to do the same thing with some linear ku band lnbs but all we used was a piece of plastic

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  13. #23
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    The emp comes from the high nearby voltage generating an emf in your coax that causes a voltage spike at both ends of the cable. I had this same problem but the gas surge suppressors worked for me. I have bought 3 chinese c band lnbs, and all 3 only work on 1 polarity. If your curious about building an emp cage it's called a faraday cage.

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    I'm going to see if I can build something like posted. My dad just called and he lost Metv at home. But I'm sure it's just the dish is a little out of alignment. All the other channels work. I really need to hire someone to point his dishes.

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    So I got the new lnb up at the lake but I can’t get some transponders. The ones that don’t work are of course and I the ones I want. 3725, 3733,3744, 3748, and 3764. The lnb manual says it works from 3.7ghz up to 4.2ghz. Low frequency 5150 and high 5750. Any tricks?

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    Quote Originally Posted by dcapper View Post
    So I got the new lnb up at the lake but I can’t get some transponders. The ones that don’t work are of course and I the ones I want. 3725, 3733,3744, 3748, and 3764. The lnb manual says it works from 3.7ghz up to 4.2ghz. Low frequency 5150 and high 5750. Any tricks?
    seems those are Vertical Transponders, can you confirm you are receiving any Vertical Transponders?

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    You are right! I’m not getting any vertical transponders. Do I just need to rotate the lnb?

  18. #28
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    Quote Originally Posted by dcapper View Post
    You are right! I’m not getting any vertical transponders. Do I just need to rotate the lnb?
    what kind of lnb is it? does it receive both Horizontal and vertical polarities?

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    Itís a cheap Chinese one but it should work.
    Attached Images Attached Images

  20. #30
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    So I rotated the lnb and now I only get the vertical transponders. I’m using a Freesat V8 super. I either get a high signal on vertical or a high signal on horizontal. Am I missing something?

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