Introduction
The SWSD-1 is a single-wire, single direction
Beverage Antenna System. The SWSD-1 consists of a receiver matching
transformer assembly, and a 10-watt non-inductive termination resistor
assembly. Both the matching transformer and termination assemblies are
designed to mount to a 1” OD galvanized water pipe available from any home
improvement store. For improved grounding, there are provisions to connect
both assemblies to separate ground rods as well. The SWSD-1 interfaces to
your receiver via standard 50-ohm cable.
Unlike other systems, this is a complete water tight
solution ready to install since it includes the watertight boxes, and
mounting system that also serves as the ground connection. It also
includes two choices of impedances so you can correctly match a wire close
to the ground as well as wires that are 8-10 feet above ground, this means
your feedline will not have VSWR on it which can be a problem and allow
signal pickup. Compare, our quality, finish, and larger replaceable
termination resistor and you will be amazed at the ease of use, even in
harsh environments, which means reliability for life. We also use standard
SO239 connectors over clumsy and flimsy type-F, for reliability and
you can use 50 ohm or 75 ohm CATV if you wish as feed systems. The
transformer will match either impedances with equally high performance.
See a Demo on
YouTube of our
Beverage system.
Specifications
·
1.8-30 MHz operation
·
Transformer assembly gas discharge tubes
minimize lightning damage
·
450 Ω and 350 Ω antenna impedance
interfaces for optimum operation , and allows use of either 50 ohm or 75 ohm
feedlines.
·
10-watt termination resistors for
improved lightning susceptibility
·
Rugged NEMA 4X housing for
long-life - harsh environment rated!
·
U-bolt mounting assembly for easy
installation
·
50
ohm or 75 ohm coaxial cable feed system
·
SWR under 1.1 from 1.5-14MHz and 1.2 to 30 MHz
(
Low VSWR means no feedline pickup)
HOW MUCH
LOSS? Poorly made transformers can steal up to 30% of your receive
signal.
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0.25dB insertion loss measured by VNA , see plots below
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Measured VSWR from 1 to 16MHz
Transformer insertion Loss ( .25db )
through one transformer as shown below.
The above graph is done with two Beverage
transformers set up back to back. the loss numbers of approx .5 dB mean is
for two transformers, one transformer has .25 dB of loss. from 1.5 to
over 16MHz.
Components Required But Not Supplied
·
Two 1”OD x 4’(minimum) galvanized water pipes
for mounting, or ground rods
·
Antenna wire
·
Insulators and supports to support the
antenna wire 5 to 10 feet above ground.
Installation
Both the matching transformer and the
terminating resistor assemblies are designed to be mounted to a 1”OD
galvanized pipe that can simply be pounded into the ground. The typical
installation is shown below:
For optimum antenna matching, two impedance interfaces
are provided on the SWSD-1 Beverage Transformer and Termination assemblies.
Antenna heights of 3-4 feet will work best with the 350 ohm impedance
interface. The more typical Beverage antenna height of 8-10 feet will work
best with the 450 ohm impedance interface. In all cases, you will need to
provide insulated antenna supports along the antenna run. When the antenna
system has been installed, it can be simply tested using an antenna analyzer
connected to the SO-239 connector on the Beverage Transformer assembly. You
should see a relatively constant SWR across your frequency bands of
interest. Finally, the SWSD-1, like any other Beverage antenna system, is
designed as a receiving antenna. Do not transmit into the SWSD-1 with more
than 10-watts (the power rating of the terminating resistor assembly).
Buy it from our Shopping Cart
Manual download
Very clean and complete design.
Inside View, transformer box on left and termination box on right
No PCB to get burnt up from lightning strikes nearby, real Gas Discharge
tubes for added lightning protection, Isolated windings on
transformer, 10 watt resistors, probably can take 1kW of Peak Lightning
power, galvanic correct metals to prevent corrosion throught, Ground buss to
connected to U-Bolt plate as well as a stainless steel bolt to make
grounding the antenna easy, fast, and strong. There are tabs on the
box to strain relief the Beverage Antenna wire as well. NEMA 4X rated
harsh environment boxes.
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