The following document describes my proposed antenna system that I am
about to put up. If you have any comments, either post them for the
world to see of send them to me at islabs!ateq!rocky!larryt@sequent.com.
My return address in the header is not correct. Thanks in advance for
your comments.
Tree N6TR/7
I am about to dig holes in the ground for the new N6TR station. I
would be intersted in any comments you might have using your contest
experience.
This is not a big multi-multi station, but rather intended primarily for
single op and some possible multi-two operations. The QTH is pretty
flat and is generally above average terain. While I live on 14 acres,
I have allocated the two acre area shown below for my antenna farm.
Tower 1 already exists. The other towers can go anywhere. The shack
is at the left side of this picture and there is a neighbor to the
north and another to the east. To the west, there is a 100 foot drop
to a stream and then the land goes back up the same 100 feet (about
400 feet away).
-----------------------------------------------------------------------
| |
| + ^ |
| Tower 2 | |
| 70 feet |
| | |
| + Tower 1 Tower 3 + V |
| |
| <-------------- 120 feet -------------> |
| |
| ---> North |
| |
-----------------------------------------------------------------------
TOWER 1 - 45 foot tower, one set of guys.
- Wilson SY36 rotating at 45 feet.
- Loaded tower on 80/75 meters (this antenna really WORKS!!).
- Sloping 40 meter dipole out of a tree.
TOWER 2 - 75 foot tower, two set of guys, 10 foot rotatable mast.
- 5 element 20 meter KLM & 3 element 40 meter KLM interlaced at 76'.
- 5 element HyGain 10 meter beam on same mast at 83'.
- Loaded as a vertical on 160 meters (maybe phased with tower 1).
TOWER 3 - 75 foot tower, two sets of guys, 10 foot rotatable mast.
- 4 element 20 meter beam at 76', 36 foot boom.
- 4 element 15 meter beam on same mast at 83'.
- Eventual side mounted 4 element 15 at 55 feet (maybe phased).
- Possible phased 160 vertical with tower 2, endfire EU/Pacific,
broadside US/JA. Approximate 90 foot spacing between towers.
All towers are Rohn 45. I could make tower 2, 95 feet and tower 3, 65
feet if I really wanted to. At my last QTH, I tried the 20 and 40
meter antennas on the same boom and was quite surprised at the results.
I expected the pattern on the 20 to deteriorate, but it didn't. Both
antennas appeared to work as well as they did on separate booms with 7
feet of spacing.
160 METERS
----------
Loaded 75 foot tower vertical (tower 2) or phased veritcal array.
Inverted vee at 100 feet out of a tree.
80 METERS
---------
Loaded tower vertical (tower 1).
Half wave dipole at 75 feet between the tower 2 and trees.
40 METERS
---------
3 element rotatable beam at 76'.
Sloping dipole out of a tree.
20 METERS
---------
5 element rotatable beam at 76'.
4 element rotatable at 76'.
3 element tribander at 45'.
15 meters
---------
4 element rotatable at 83'.
3 element tribander at 45'.
4 element sidemounted at 55 feet (300 degree rotation).
10 meters
---------
5 element rotatable at 85'.
4 element tribander at 45'.
Feedline 1 - Tower One (Remote antenna switch)
----------------------------------------------
1. 160 vertical (tower 2 and maybe tower 3).
2. 80 meter tower vertical
3. 80 meter dipole
4. 40 meter sloping dipole
5. Tribander.
Feedline 2 - 100 foot Tree
--------------------------
1. 160 meter inverted vee at 100 feet in tree.
Feedline 3 - Tower 2 (Remote antenna switch)
--------------------------------------------
1. 3 element 40
2. 5 element 20
3. 5 element 10
4. Reserved for future side-mounted beam.
Feedline 4 - Tower 3 (Remote antenna switch)
--------------------------------------------
1. 4 element 20
2. 4 element 15
3. 4 element side mounted 15
4. Reserved for side-mounted beam
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