Download S9W Installation Guide
The S9W is a heavy-duty 43 foot wire vertical for 80 - 6 Meters that is easily hung from a tree
or other support structure, providing excellent DX results for a modest investment and minimal
use of real estate. The antenna may be shortened to either fit the height of the support
structure or for use as a 40, 30 or 20 Meter monoband vertical, if desired.
The S9W comes assembled and is sold as a complete package with high-quality components.
The package includes our popular S9 Radial Plate plus 20 sets of stainless steel nuts, bolts,
washers and lock washers. The S9 Radial Plate is used to connect and organize your ground
radials and to provide the critical ground connection for your coax feed line. 30 ring terminal
connectors are also provided to secure your ground radials to the radial plate.
Also included is a ground stake (to secure the vertical within the center of the radial plate) and
all required ancillary hardware such as a high-tech, non-metallic polymer pulley and 50' of
braided Dacron support line. When you buy an S9 antenna, you don't need to make additional
trips to the hardware store just to install your antenna!
To use the S9W, you will need a quality antenna tuner in your shack or remotely located at the
S9W feed point. (Internal rig tuners do not have adequate range to match the high
impedances presented by the antenna on certain HF frequencies.) We recommend the LDG
Electronics series of auto tuners. LDG tuners easily handle the wide-range of impedances
presented by the S9W.
A 4:1 unun is recommended at the antenna feedpoint. A 4:1 unun lowers the higher
impedances presented by the antenna and also helps isolate RF currents from your coax
feedline. Balun Designs manufactures two 4:1 ununs that may be used with the S9W. You
have two choices, depending on the amount of power you expect to run:
Finally, In lieu of an antenna tuner in your shack, you can use a weatherproofed, remote
antenna tuner at the S9W feed point for absolute lowest loss and best over-all multi-band
performance. When a remote tuner is used at the antenna feedpoint, a 4:1 unun is not
required. However, a 1:1 current choke balun may be needed between the tuner and your
transmitter if you experience RF current in your shack. (Burying your coax cable also helps
minimize RF current from flowing back into your shack.)
For optimum performance, the S9W should be used with radials (16 recommended, 32
preferred), with each radial at least 0.2 wavelength at the lowest operating frequency.
Band Frequency Minimum Radial Length
80 Meters 3.5 MHz 53.5 feet long (53 feet, 6 inches)
40 Meters 7 MHz 26 feet, 5 inches
Actually, there is no precise formula to calculate ground-mounted radial length because
everyone has different soil and soil tends to change the electrical length of the radials.
However, a general rule of thumb for radials is: “longer” and “more” is better. If you have the
time and resources, 32 (or more) radials 0.2 wavelength (or longer) should be considered to
ensure top performance.
The S9W is a heavy-duty 43 foot wire vertical for 80 - 6 Meters that is easily hung from a tree
or other support structure, providing excellent DX results for a modest investment and minimal
use of real estate. The antenna may be shortened to either fit the height of the support
structure or for use as a 40, 30 or 20 Meter monoband vertical, if desired.
The S9W comes assembled and is sold as a complete package with high-quality components.
The package includes our popular S9 Radial Plate plus 20 sets of stainless steel nuts, bolts,
washers and lock washers. The S9 Radial Plate is used to connect and organize your ground
radials and to provide the critical ground connection for your coax feed line. 30 ring terminal
connectors are also provided to secure your ground radials to the radial plate.
Also included is a ground stake (to secure the vertical within the center of the radial plate) and
all required ancillary hardware such as a high-tech, non-metallic polymer pulley and 50' of
braided Dacron support line. When you buy an S9 antenna, you don't need to make additional
trips to the hardware store just to install your antenna!
To use the S9W, you will need a quality antenna tuner in your shack or remotely located at the
S9W feed point. (Internal rig tuners do not have adequate range to match the high
impedances presented by the antenna on certain HF frequencies.) We recommend the LDG
Electronics series of auto tuners. LDG tuners easily handle the wide-range of impedances
presented by the S9W.
A 4:1 unun is recommended at the antenna feedpoint. A 4:1 unun lowers the higher
impedances presented by the antenna and also helps isolate RF currents from your coax
feedline. Balun Designs manufactures two 4:1 ununs that may be used with the S9W. You
have two choices, depending on the amount of power you expect to run:
Finally, In lieu of an antenna tuner in your shack, you can use a weatherproofed, remote
antenna tuner at the S9W feed point for absolute lowest loss and best over-all multi-band
performance. When a remote tuner is used at the antenna feedpoint, a 4:1 unun is not
required. However, a 1:1 current choke balun may be needed between the tuner and your
transmitter if you experience RF current in your shack. (Burying your coax cable also helps
minimize RF current from flowing back into your shack.)
For optimum performance, the S9W should be used with radials (16 recommended, 32
preferred), with each radial at least 0.2 wavelength at the lowest operating frequency.
Band Frequency Minimum Radial Length
80 Meters 3.5 MHz 53.5 feet long (53 feet, 6 inches)
40 Meters 7 MHz 26 feet, 5 inches
Actually, there is no precise formula to calculate ground-mounted radial length because
everyone has different soil and soil tends to change the electrical length of the radials.
However, a general rule of thumb for radials is: “longer” and “more” is better. If you have the
time and resources, 32 (or more) radials 0.2 wavelength (or longer) should be considered to
ensure top performance.
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
| |
 |
S9W 43' Wire Vertical
with Radial Plate
with Radial Plate
- Heavy-Duty 43' Wire Vertical
- Completely Assembled
- 80 - 6 Meter Coverage
- 2 KW Power Rating
- Beefy 12 AWG Insulated
Wire Construction with
Traditional Ceramic
Insulators - Hand Soldered and
Wrapped Connections - Not
Crimped! - Includes S9 Radial Plate
and Hardware Pack,
Ground Stake, 30 Ring
Terminal Connectors, 50' of
Dacron Support Line, a
High-Tech Polymer Pulley
and all Necessary Hardware - Excellent DX Performance!
(Click for full-size image)
