EAntenna 5070OWA8 - User Manual

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5070OWA8

2,15m

Peso: 4,2 Kg.

Max. Potencia: 5,0 kW

Yagi Antenna

EAntenna's multi-band OWA antennas also represent the biggest development in HF to 70MHz single-band antennas, but optimizing the

results in the same boom several bands.

This performance is characterized by:

The feed is direct to 50 Ohms with a single coax.

The bandwidth of the OWA is the best development of technology to cover the entire bandwidth and have a low SWR.

The radiation lobe is similar to LFA, but has more front gain than LFA.

The F/B ratio is medium to high, compensating for the high frontal gain.

All of this is explained, because in EAntenna: Millimeter by millimeter, we manufacture and build with CNC machinery and/or prepared for

measurements with centimeters, for an exact measurement. Every piece of aluminum is taken care of, filing it of external and internal

surfaces. All this is done by hand, by qualified people prepared for a final product of extreme quality.

All the hardware is stainless Steel W4.

The aluminium used is T5 6061/6063 and T6 6082; the best alloys for manufacturing antennas with extreme weather resistance. Weather

was double here

EAntenna's OWA antennas are always insulated from the boom, with German PP (Polypropylene, -30ºC/+60ºC) plastic clamps.

Specifications of the 5070OWA8:

Square boom size is 30x30x2mm.

The elements are with 13mm diameter, splitted in 2 parts to get along with a suitable transport length.Mast to plate is an 100x100mm with

6mm thickness and M6 square U-bolts for the boom to the plate and M8 U-bolts for the plate to the mast.

Characteristics of the 5070OWA8

If you can't put 2 antennas on your tower, don't worry, this is your solution to take advantage of the propagation ES seasons on these 2 bands,

You don’t need 2 coax cables, this antenna have only 1 coax to the Radio.

Even when you go to the field or portable, with a simple TV rotor you can move without problems.

Simple and fast assembly, because the pieces of the boom connection are very easy to assemble.

Very solid antenna construction, and with an acceptable weight.

Artikel nr: 17810.64-8

Rev. V1.6 - 22/02/2021

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This document describes the Yagi Antenna 50700WA8, a multi-band OWA (Optimized Wideband Antenna) designed for amateur radio use. It is engineered to provide significant development in HF to 70MHz single-band antennas, optimizing the results across multiple bands simultaneously.

Function Description:

The 50700WA8 is a high-performance Yagi antenna, characterized by its robust construction and efficient design. It is intended for amateur radio enthusiasts who require a reliable and high-gain antenna system for various frequency bands. The antenna's OWA design allows it to operate effectively across multiple bands without requiring complex tuning or adjustments for each band. This makes it a versatile choice for users looking to maximize their operating capabilities with a single antenna. The antenna is designed to be fed directly with a single coaxial cable, simplifying installation and reducing potential signal loss. Its ability to cover the entire bandwidth with a low SWR (Standing Wave Ratio) ensures efficient power transfer from the transmitter to the antenna, minimizing reflected power and optimizing performance. The favorable F/B (Front-to-Back) ratio indicates good directivity, which helps in reducing interference from unwanted directions and improving signal clarity.

Important Technical Specifications:

The 50700WA8 antenna boasts the following key specifications:

Elements: 4
Frequency Range: 70–70,5 MHz
Gain: 8,58 dBi
F/B (Front-to-Back Ratio): 18,76 dB
SWR (Standing Wave Ratio): 1,0:1–1,3:1
Impedance: 50 Ohms
Max. Power: 10 kW
Boom Length: 6,72' (approximately 2.05 meters)
Wind Survival: ≥ 100mph (approximately ≥ 160km/h)
Weight: 11,3 Pounds (approximately 5.1 Kg)
Boom Size: 30x30x2mm
Element Diameter: 13x1mm

The antenna's construction utilizes high-quality materials to ensure durability and performance. The boom is made of aluminum, and the hardware consists of stainless steel (DIN 933 M6X16 and DIN 9021 M6 screws and washers for boom joints; DIN 912 M6X40 and DIN 985 M6 for element plates). The aluminum used is T5 6061/6063 and T6 6082, which are the best alloys for manufacturing antennas with extreme weather resistance. The elements are designed to withstand significant wind loads, contributing to the antenna's longevity in various environmental conditions. The maximum power handling of 10 kW makes it suitable for high-power amateur radio operations.

Usage Features:

The 50700WA8 is designed for ease of assembly and installation. The assembly process involves matching frontally boom parts with the same letter (e.g., AA, BB, CC, etc.) and securing them with screws and washers. The plates for the elements are positioned according to a detailed diagram, ensuring correct spacing and orientation. The elements themselves are inserted into the plates and secured with screws. The boom is composed of multiple sections that are joined together, and the elements are attached to the boom at specific points.

The antenna is fed via a coaxial cable, which is connected to the driven element. The manual provides clear instructions for connecting the coaxial cable and ensuring proper SWR adjustment. The SWR can be fine-tuned by adjusting the driven element (DRV.6) inward or outward by several millimeters to optimize performance at specific frequencies (50 MHz and 70 MHz). The recommended method for SWR adjustment involves using an antenna analyzer or radio with SWR meter, with the antenna installed at its final height.

The clamping plate for the mast/boom connection (EA013018) is designed for robust attachment, using U-bolts and square U-bolts to secure the boom to the mast. This ensures a stable and secure installation, even in high winds. The antenna's design allows for relatively easy adjustments and maintenance, making it user-friendly for amateur radio operators.

Maintenance Features:

The Yagi Antenna 50700WA8 is built with durability in mind, using materials that are resistant to corrosion and extreme weather. All hardware is made of stainless steel, which prevents rust and ensures long-term structural integrity. The aluminum boom and elements are also chosen for their resistance to environmental degradation.

Regular maintenance should include visual inspections of all connections, screws, and elements to ensure they remain secure and free from damage. Any loose screws should be tightened, and any signs of corrosion or wear should be addressed promptly. The manual emphasizes the importance of using washers with all screws during assembly to prevent damage to the threads in the boom, which is a key aspect of long-term maintenance.

The design of the elements and boom allows for individual components to be replaced if necessary, extending the overall lifespan of the antenna. The detailed packing list, which includes part numbers, descriptions, and quantities of all components, facilitates easy identification and ordering of replacement parts. This modular approach simplifies repairs and ensures that the antenna can be maintained in optimal working condition for many years. Proper installation, following the provided instructions, is crucial for minimizing future maintenance needs and ensuring the antenna's longevity and performance.