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Duty Outdoor Shortwave Antenna
The Outdoor Shortwave Antenna is a very unique and very effective
adaptation of existing antenna theory. It operates as quarter wave
sloper which means the wires are a quarter wave long, or multiples
of a quarter wave on each frequency band. Compared to half wave
dipole, the other quarter wave, which is necessary for performance
and the proper feed point impedance, is made up of the "Down-Lead"
wire which is attached.
With a quarter wave sloper, the center conductor of the coax is
attached to the wires and the shield of the coax is attached to
the down lead. A standard SO-239 UHF connector is provided on the
Outdoor Shortwave Antenna for this purpose. Excellent performance
is attained with installation heights of only 20 to 40 feet.
By design, the quarter wave sloper is known to be an excellent
DX and long haul antenna. The current lobe, which defines the major
radiation characteristics of the antenna, is up high at the feed
point and is not subject to attenuation from buildings, trees, etc.
as a vertical antenna whose current lobe is at ground level. During
testing, side by side comparisons between the Outdoor Shortwave
Antenna and a 32ft commercial vertical with 18 radials show the
DX-SWL to be as much as 10 dB stronger into Europe and Africa.
Since a sloper has an optimized low angle radiation pattern for
peak DX performance, it will greatly outperform a dipole mounted
at the same height, for those really distant weak signal DX stations.
The difference can be phenomenal.
The Outdoor Shortwave Antenna is fully assembled, uses stainless
steel hardware and UV protected coils and components and No. 12
wire. It is designed to survive severe weather environments. Insulators
and support rope are included.
The overall length of the slope wire is only 60 feet long. A single
50 ohm feed point (for PL259) at the apex of the antenna is provided
for maximum DX reception. (User supplies their own 50 ohm coaxial
lead-in). The DX-SWL is fully assembled for easy installation. It
requires no adjustments or "trimming". This American made
antenna has stainless steel hardware for long life and utilizes
low-Q RF choke-resonators for efficient multi-band frequency selection.
For quality of construction, ease of erection and maximum performance,
we think the Alpha-Delta DX-SWL is a great value. It is our most
popular shortwave antenna.
Multi-Band Performance covering:
- Medium Wave AM (.5-1.6 MHz)
- 120 Meters (2.3-2.5 MHz)
- 90 Meters (3.2-3.5 MHz)
- 60 Meters (4.75-5.0 MHz)
- 49 Meters (5.95-6.2 MHz)
- 41 Meters (7.1-7.3 MHz)
- 31 Meters (9.5-9.9 MHz)
- 25 Meters (11.65-12.05 MHz)
- 21 Meters (13.6-13.8 MHz)
- 19 Meters (15.1-15.6 MHz)
- 16 Meters (17.55-17.9 MHz)
- 13 Meters (21.45-21.85 MHz)
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