HTPC OTA - Antenna problem!

Jaxidian

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Oct 22, 2001
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So I've got a big 3-foot antenna (not powered or anything) that I'm going to mount in my attic but in the mean time, I just have it in a spare room near a window. When I hooked this guy up, it rocked and I could get great HDTV OTA reception. However, after a couple weeks, the reception ended up being crap (permanently over a period of weeks). I couldn't figure out what had happened and almost blew it off as, "Well, maybe I was just lucky".

However, I did try one last-ditch effort and moved the antenna to another room. Well, what do you know, it worked great! I move it back to the former room, works like crap. Back to the new room, it works great! I whip out a little cheapo antenna to test with it too and I found identical results! Even it could get pretty decent (though not good enough) reception in the new room but not the old room. Well, I figured maybe I was messing around with something and broke a connection in a cable or something.

Well, just a few weeks later, I'm back at the same point! Now the antenna doesn't work in the second room but bringing it to a third room does! And this time I'm 200% certain I didn't make any changes myself.

So what am I doing that keeps messing this up?


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Just more info as I'm sure it may or may not be relavant. My house has coax ran all through it with a junction box (is that what they're called?) in the garage. Whenever I hook the antenna up in a room, I reroute these coax cables so there is a direct connection between the antenna and my HTPC (I don't care about this signal in other rooms for now - I may later but I have bigger problems for now). I have tried re-terminating these cables at the junction box without luck so it's somewhere in the house or up in the room where the cable is going bad.

HELP!!!

-Jax
 

StraightPipe

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Feb 5, 2003
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it's proably your tinfoil hat....

no seriously, if i were in your situation I wouldnt bother to permanently mount it. Seems you hot spots are moving periodically, and you'll need to move your antenna too. Either that or get a bigger/powered antenna aand mount it in the highest location possible to avoid interferrence.
 

Jaxidian

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Oct 22, 2001
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Originally posted by: StraightPipe
it's proably your tinfoil hat....

no seriously, if i were in your situation I wouldnt bother to permanently mount it. Seems you hot spots are moving periodically, and you'll need to move your antenna too. Either that or get a bigger/powered antenna aand mount it in the highest location possible to avoid interferrence.

I just tried running coax to my antenna to a different room but without moving the antenna and that resulted in good reception to my HTPC. So I've pretty much narrowed it down to the cable between the antenna and the junction box in the garage as being the variable that is causing the problem. So what the hell am I doing that's making the cable go bad?
 

Jaxidian

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Oct 22, 2001
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Originally posted by: MrPickins
Do you have large trees around your house that are regrowing leaves?

Nope, nothing at all blocking it. And like I said before, I can leave the antenna in the exact same place and just run a new coax cable and it gets great reception again.

-Jax
 

skriefal

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Apr 10, 2000
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Originally posted by: Jaxidian
[I just tried running coax to my antenna to a different room but without moving the antenna and that resulted in good reception to my HTPC. So I've pretty much narrowed it down to the cable between the antenna and the junction box in the garage as being the variable that is causing the problem. So what the hell am I doing that's making the cable go bad?

You must have some very odd RF propogation patterns, or perhaps immense amounts of RFI from other nearby non-TV transmitters. Is your home near the broadcast towers?

Also, it's possible that when you ran the test above that the new coax cable might have been defective or poorly shielded, and thus itself acting as a form of antenna. Unless you have a big rat with a taste for coax, it's unlikely that the coax cables in your walls are failing every few weeks.