Description
1/2 vertical antenna fed at the base for the 20m band by fine tuning via a high-voltage variable capacitor insulated in PTFE.
Extremely robust construction in AW6063-T66 aluminum alloy and components machined from solid using CNC.
Supplied with quality INOX 304 and 316 hardware for long, rust-free service.
High applicable input power, up to 3Kw continuous All-mode.
Detailed assembly manual and serial number identifying the production batch and construction data.
NOTE: Supplied with a 3-point guying ring which we always recommend installing.
For our tubes, we have used the best alloy available for antenna construction, the AW6063-T66 aluminum, magnesium, and silicon alloy, tempered to T-66 state, which gives the element exceptional strength. It is produced by extrusion and then cold drawn. Our tubes are extremely precise in both diameters and wall thickness, allowing for precise coupling with minimal "play" between tubes.
| Electrical Data | Mechanical Data | |||||
|---|---|---|---|---|---|---|
| Type | Vertical 1/2 Wave End-Fed Dipole | Materials | Cold-drawn tube in AW6063-T66 aluminum alloy, Fiberglass, Brass, PTFE. All screws in INOX AISI-304 and 316 |
|||
| Frequency Range | 20m Band - Full coverage | Wind surface area | 0.265m2 | |||
| Impedance | 50Ω Unbalanced | Load @ 130Km/h (without ice) | 25 Kgf | |||
| Radiation | Omnidirectional | Wind resistance (without ice) | 130 Km/h (guyed) | |||
| Polarization | Linear – Vertical | Total Height | 10.7m | |||
| Gain | 0 dBd – 2.15 dBi | Element Length | 10.13m (half-wave) | |||
| Bandwidth with SWR 2:1 | = 0.8MHz | Mounting pole | ø 40-54 mm | |||
| SWR at resonance | =1.2:1 Typical =1.1:1 | Net Weight | 5.4 Kg | |||
| Max applicable power | 3000 Watts continuous all emission modes | Packaging Dimensions | 14x14x145 cm | |||
| Feeding | High “Q” L-C circuit - DC grounded | Packaged Weight | 6.6Kg | |||
| Connector | UHF female 50Ω - PTFE insulator, gold-plated center pin | |||||
Because an antenna that accepts high power is a more efficient antenna; otherwise, it would tend to heat up due to the Joule effect and dissipate a significant part of the applied RF power as heat, which happens with most competing products, but which users unfortunately cannot test due to lack of adequate equipment and instrumentation.
The high "Q" L-C matching circuit
For this product, we have developed a special parallel L-C circuit to match the high impedance presented by this type of antenna when fed at the base. The high "Q" coil is generously sized, air-wound without metallic cores, with widely spaced turns. The coaxial-type variable capacitor (similar to a Gamma Match) located next to the coil is made with PTFE insulation. It can withstand extremely high voltages exceeding 40 KV, is not affected by ambient temperature, rain, or humidity, and does not heat up when subjected to high power. Furthermore, it allows for simple and convenient tuning at the base of the antenna.
During the development of the matching circuit, we carefully adjusted both the inductance (L) and the capacitance (C) to obtain a truly efficient, reliable, and problem-free circuit. All these measures result in high efficiency and the ability to withstand RF power up to 3Kw continuous in all modes.
In addition, the coil is directly connected to ground in DC, thus significantly reducing atmospheric and impulsive disturbances.
The UHF Connector
The connector is not a commercial SO-239 type as used by most manufacturers. This connector was designed and manufactured directly by us, featuring a true 50 Ohm impedance and usable up to 500MHz. We have created a reliable connector capable of handling continuous 5kW CW at 30MHz and over 3kW at 50MHz.
The body is made of nickel-plated CW614N brass, while the pin is 24K gold-plated to prevent oxidation and features a 4-fin insulator that maintains its centering and elasticity, preventing loss of contact.
The insulating part is made of PTFE, which is one of the best insulating materials due to its exceptional electrical properties (low dielectric constant and reduced loss factor) and thermal properties (operating temperature from -100° to +260°). It is protected by a special elastomer cap that prevents water and humidity infiltration.
The Mounting Bracket
Made of 2.5mm thick AISI304 stainless steel, it is fixed to the antenna tube using a clamp system, creating an extremely robust mechanical lock.
Attachment to the mast is achieved with M6 V-Bolt U-bolts in AISI304 and column nuts to facilitate tightening.
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