Bad Satellite Antenna

[Mark Whittington]

I believe that the LNBs on current generation DBS systems is powered over
the coax.

-Mark

On Wed, Aug 3, 2011 at 7:56 PM, Richard <revo753 at yahoo.com> wrote:

>
> Hi All,
>
> Robert, I think your question is great.
>
> I wish: I could answer it.  When examining the LNB, I did not see any power
> wires, just the RF lines.  I have wondered, and do not understand how the
> LNB gets it's power.  Robert, anything you could say about this would help.
>
> I have never had any experience with satellite antennas.  Last night I
> googled the words "satellite TV antennas" to learn something.  That is how I
> learned about the LNB.  Today I removed the LNB from the arm just to look it
> over.  I wrote down the numbers on it.  I also measured the antenna.  I do
> not know how these antennas are supposed to be measured, but across the dish
> horizontally I measured 18", and in the vertical direction, up and down the
> dish, I got 191/2"
>
> In looking over the LNB, I did not see any power wires or connections.  All
> I saw was two F type RF connectors.  One by one, each separately, I
> disconnected the F connectors, and examined them, then put them back.  I did
> not see any obvious damage.
>
> I tend to believe the LNB is bad due to lightening, which seemed very very
> close when this problem began.  I put my hands on the antenna, and it seemed
> solidly mounted, so I don't think it has moved, even thought the wind was
> strong.
>
> The LNB has two RF lines coming out of it going to two different set-top
> boxes.  Both of these set top boxes say they can not "see" the satellite.
> So, I think the problem is with the antenna, the LNB, the power to the LNB
> (I don't know how it get it's power.  Perhaps, I missed something, when I
> examined the LNB, as I did not fully remove it from the arm.)  Or perhaps
> the transmission cable from the antenna to the house is bad, but this seems
> unlikely.
>
> Any help would be most appreciated.
>
> I would like to learn about how this works, and get the system up and
> running.
>
> Best Wishes
> Richard Demaret
> KI4KXJ
>
>
>
> --- On *Wed, 8/3/11, Robert E. Seastrom <rs at seastrom.com>* wrote:
>
>
> From: Robert E. Seastrom <rs at seastrom.com>
> Subject: Re: Bad Satellite Antenna
> To: "Richard" <revo753 at yahoo.com>
> Cc: tacos at amrad.org
> Date: Wednesday, August 3, 2011, 6:00 AM
>
>
>
> Stupid question - is there power to the power injector that sends
> juice to the LNB on the dish?
>
> -r
>
> Richard <revo753 at yahoo.com> writes:
>
> >
>
> >  Hello,
>
> >  I am wondering if any of you have had a problem with a bad satellite
>
> >  antenna.  Last night we, in the Manassas area, had a  thunderstorm.
> The
> >  picture on the satellite TV froze.  I rebooted the digital recorder
> set-top
> >  box.  It came back on.  I thought all was OK, and so continued watching
> my
> >  recorded programs.
>
> >  Today, I found the the recorded programs is all I have. The set-top box
> says
> >  the antenna can not see the satellite.  We have two of these set-top
> boxes
> >  on two different TVs.  The result is the same on both of them.
>
> >  It would appear to me, the antenna is bad.  I looked it over a few
> hours
> >  ago, but could find nothing obviously physically wrong with it.
>
> >  I am wondering, if any of you have had a similar problem.
>
> >  Best Wishes
>
> >  73
>
> >  Richard Demaret
>
> >  KI4KXJ
>
> >
>
> >
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> > Tacos at amrad.org
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>
>
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