jdmarti1
Jack
join:2004-06-15
Oilton, OK
| Omni at 100' on a 192' tower
We have arranged a lease on a 192' tower self supporting tower, but we only want to put our omni at 100'. The coverage we are going to get at this height is all we are looking for, and we won't overshoot the closer customers. This is a small self supporting tower. If need be I can get a pic of the tower. What effects will the tower have on the coverage of the antenna? Is there a way to predict it? How far out should we place the antenna to minimize the effects? Thanks in advance. |
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billaustin
Bill
Premium,MVM
join:2001-10-13
North Las Vegas, NV
| The effects will vary with the tower type and location of the antenna on the tower. You could end up with a null (dead spot) in the pattern on the far side of the tower. The multi-path and reflections from the signal bouncing off the tower could wreak havoc with your coverage area. Then again, you just might get it in that 'right' spot where everything works fine and it doesn't make any difference.
If you can use an offset or side mount and get it 2 to 4 feet out from the tower, you should be fine. |
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VariableARK
join:2003-03-17
USA | reply to jdmarti1
if you can, you should try to use sectors (ie 3x120 degrees) |
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polk5
join:2001-12-29
New Orleans, LA | reply to jdmarti1
Ummm, do you have any more details? What freq do you intend to use? How many clients do you intend to put on this omni? How far is the furthest client? Nearest client? |
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Antennaguy
join:2001-08-06
Lincoln, NE
| reply to jdmarti1
I would also recommend using sector antennas instead of an omni on the side of the tower. With the omni, you will get peaks and nulls in the pattern, regardless of the spacing from the tower. The farther from the tower it is (>4 feet), the more peaks & nulls there will be, although the nulls won't be as deep (10-15 dB instead of 20-25 dB). |
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