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Sherlock Ohms

West Wind Tilts Radio Antenna Out of Range

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rathomas
User Rank
Iron
Re: Visual inspection beats all
rathomas   8/28/2012 1:01:32 PM
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Rain fade and attenuation due to foliage are real, but are much more of a problem in the GHz region than around 650 MHz.  I believe he said the channels were all digital, so if he has a marginal signal on a good day, maybe just a little bit more attenuation is enough to trip the all-or-nothing barrier.

warren@fourward.com
User Rank
Platinum
Re: Visual inspection beats all
warren@fourward.com   7/9/2012 10:45:02 AM
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Reminds me of the time I went up a tuna boat mast to see why the VHF radio was only receiving signals from the boat tied up next to it.  When I looked for the antenna, it wasn't even there.  I guess a bird had hit it and it was weakened from the sun and sheared off.


Look before you leap.  I could have spent hours checking out the radio when it was nothing more than the antenna- or lack thereof...

 

Rob Spiegel
User Rank
Blogger
Re: Visual inspection beats all
Rob Spiegel   7/2/2012 2:28:53 PM
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Huh. At any rate, I find it interesting that the reception problem due to the tree becomes worse when it rains.

mrmikel
User Rank
Iron
Re: Visual inspection beats all
mrmikel   7/2/2012 2:14:27 PM
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Darned if I know.  Its effect seems to be worse on one channel than the other, but all are in the UHF 40-50 range and all digital.  I have suspected that translator antenna might be flaky, but I'd have thought it would have been fixed if it were a problem.  It used to be at a different location but I moved it since it looked into two trees in my yard on the other side of the house.

This is a retirement town though, so maybe they just think there is something wrong with their setup, or they are working with a better antenna than mine: a corner reflector that fell off the house in the a windstorm, then had a tree limb hit it when the neighbor was taking down his tree!  I am afraid the mast still has a bit of a up tilt.

 

Rob Spiegel
User Rank
Blogger
Re: Visual inspection beats all
Rob Spiegel   7/2/2012 1:54:42 PM
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Interesting, Mrmikel. How does the rain factor in. Does the rain make the tree more dense?

mrmikel
User Rank
Iron
Re: Visual inspection beats all
mrmikel   6/30/2012 3:26:37 PM
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Our signals come from a 200 watt translator several miles away.  When it rains, the signals deteriorate because of a large tree across the street in the line of sight of the antenna.

Rob Spiegel
User Rank
Blogger
Re: Visual inspection beats all
Rob Spiegel   6/21/2012 5:04:52 PM
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That's amazing, Tool_maker, that the trees would make such a profound difference in your ability to receive signals.

Tool_maker
User Rank
Platinum
Re: Visual inspection beats all
Tool_maker   6/20/2012 1:03:32 PM
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Since I get nervous on a step ladder, I am glad there are people like the author willing to do the high wire stuff. Oh yeah, we just had some trees trimmed around our lake house and imagine or surprise when we now have 7 over the air channels instead of 2.

ab3a
User Rank
Platinum
Re: Visual inspection beats all
ab3a   6/19/2012 9:13:16 PM
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I have not climbed the big towers. I've been up towers to the 300 foot level. I usually had the luxury of choosing when to climb and I usually take a water bottle and a snack with me. You never know what you'll find when you climb, so stay in shape and be prepared to get off the ladder. I've been on the side of the tower on step bolts too. That was 20 years ago. I don't think I can do so well today... Jake Brodsky

notarboca
User Rank
Gold
Re: Visual inspection beats all
notarboca   6/19/2012 9:06:05 PM
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ab3a- I just could_not_climb a tower, young or old.  Kudos to those who do, it is necessary.  I watched a video of a tower climb on YouTube; amazing how much sweating vertigo induces.


streetrodder- I once worked on a design for an island to island radio system in the Caribbean, pretty hard to design for Cat 4/5 hurricane winds, just like tornado alley.

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