Sigma-5©
| True Vertical Dipole | 20-17-15-12-10 Meters | |
| NO Traps, >90% Efficient all bands | Rated at 1,200 w PEP SSB, 700w CW | |
| 9' tall, 18" Base Post, NO Radials | <1.8:1 on 17-10, >300 kHz on 20 mtrs | |
| 2' Sections, Free Standing, 7 Pounds | Simple Assembly - NO Tools - Pre-tuned |
This is a brand new, high performance vertical for the 20-17-15-12-10 meter bands. The Sigma-5© is the answer for an efficient, non-trapped, low profile, lightweight vertical. The Sigma-5© follows in the footsteps of the Sigma-40© and Sigma-40XP© single band 40 meter antennas, which were first in the Sigma© line - the result of 4 years of research, testing and development, including DX competitions with "Team Vertical" and several DXpeditions. If we knew how to make it better, we would do it! The only thing to enhance a Sigma© antenna is to place it adjacent to salt water.
The need for efficient vertical antennas has been evident for many years and, as a result of customer requests, the Force 12 ZR-3 was developed several years ago. This small, 6' tall antenna is an effective 20-15-10 meter vertical dipole and needs no radials. The ZR design has been provided to commercial customers for many years with excellent success; however, it is expensive to build and somewhat difficult to install. A new design was needed with the same efficiency, easier assembly, tuning and installation. The result is the Sigma© design. "Sigma" is the Greek mathematical symbol meaning "the sum of" and the Sigma© series is truly the sum of years of experience, designs and testing. Not all ideas were successful, but that is the manner of research.
Sigma-5© 20-17-15-12-10 Meter Vertical Dipole |
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Sigma-5© 9' tall, plus base 2' sections, Free standing 7 pounds 20-17-15-12-10 NO Traps 1,200w PEP SSB, 700w CW Relay Switched (complete w/50' control cable and balun) |
The Sigma-5© answers the need for everyone who wants an efficient antenna and either has limited space, or needs it to be portable. It assembles in about 5 minutes with NO tools. Add your coax and go!
The Sigma-5© is a true vertical dipole. This means it does not need radials, so the real estate needed is minimal. It is fully balanced and fed at the center, with the provided balun. The relay control is complete with 50' of 5-conductor control cable and a remote control switch, needing only 95ma at 12VDC (such as the rig power supply) and "all-off" is 20 meters. There are NO traps and the efficiency is >90% on 20 meters, rising to 99% on 10 meters. VSWR on all bands is less thawn 1.8:1, except on 20 meters, where it covers almost the whole band at <2:1. The 20 meter response can be set anywhere in the band.
Sigma-5© antenna efficiency is the same, regardless of where it is located. The antenna system efficiency (antenna + ground + feed line) is determined by proximity to nearby objects, quality of surrounding ground and coax loss. To enhance the low angle energy, one can add an extensive ground screen (dense for 20-30') under the antenna (then more screen or wires out to perhaps 5 wavelengths), or locate it adjacent to salt water - if we are fortunate to live there, or vacation to such a nice place!
Customer response on the entire Sigma series is incredibly positive - what else would you expect from Force 12?!
Get the high performance Sigma-5© from Force 12, Inc., your performance antenna company!
