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Grazioli HW20 1/2 wave vertical antenna, HF band 20m full coverage, 3 kW, 10.7 m.
Ref: HW20
€267.00
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1/2λ HF vertical antenna
20m Band – Full Coverage
Powered at the base
Max Input Power: 3kW
Total Height: 10.7 m
Antenna weight: 5.4 Kg
Description
1/2 λ base-fed vertical antenna for the 20m band with fine tuning via a PTFE-insulated high voltage variable capacitor.
Extremely robust construction in AW6063-T66 aluminum alloy and CNC machined parts.
Supplied with quality 304 and 316 stainless steel screws 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 brace for wind bracing which we always recommend installing.
Materials and Construction
For our tubes we have used the best alloy available for the construction of antennas, the AW6063-T66 alloy of Aluminum, Magnesium and Silicon tempered to the T-66 state which gives the stylus exceptional resistance, which is achieved by extrusion and subsequently cold drawn. Our tubes are extremely precise on both diameters, and also on the thickness of the wall, allowing for precise coupling and with less “play” between the tubes.
Technical Data
| Electrical Data | Mechanical Data | |||||
|---|---|---|---|---|---|---|
| Type | 1/2λ End Fed Vertical Dipole | Materials | Cold drawn tube in AW6063-T66 Aluminum alloy, Fiberglass, Brass, PTFE. All screws in AISI-304 and 316 stainless steel |
|||
| Frequency Range | 20m Band - Full Coverage | Surface in the wind | 0.265m 2 | |||
| Impedance | 50Ω Unbalanced | Load @ 130Km/h (without ice) | 25 Kgf | |||
| Radiation | Omnidirectional | Wind resistance (without ice) | 130 km/h (against the wind) | |||
| Polarization | Linear – Vertical | Total Height | 10.7m | |||
| I earn | 0dBd – 2.15dBi | Stylus Length | 10.13m (half wave) | |||
| Bandwidth at 2:1 SWR | ≥ 0.8MHz | Mounting pole | ø 40-54 mm | |||
| SWR in resonance | ≤1.2:1 Typical ≤1.1:1 | Net Weight | 5.4 kg | |||
| Max applicable power | 3000 Watts continuous all modes of output | Packaging Dimensions | 14x14x145 cm | |||
| Diet | High “Q” LC circuit - connected to ground in DC | Weight in package | 6.6kg | |||
| Connector | UHF female 50Ω - PTFE insulator, gold plated center pin | |||||
SWR & SMITH PAPER
Technical choices that make the difference
Why build an antenna capable of withstanding continuous power of 3kW?
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 into heat, which happens with most competing products, but which unfortunately users cannot test due to a lack of adequate equipment and instrumentation.
The high "Q" LC matching circuit
For this product we have created a special parallel LC circuit to be able to adapt the high impedance that this type of antenna presents when powered at the base. The high “Q” coil is of generous dimensions, suspended in the air without metal cores, with widely spaced turns. The variable coaxial capacitor (similar to a Gamma Match) placed next to the coil is made with PTFE insulation. It is able to withstand extremely high voltages above 40 KV, is not affected by ambient temperature, rain or humidity, and does not heat up when subjected to high powers, in addition it allows for simple and convenient calibration at the base of the antenna.
During the development of the matching circuit we had to carefully adjust both the inductance (L) and the capacitance (C) to obtain a truly efficient, reliable and criticality-free circuit. All these measures translate into high efficiency, and the ability to handle RF powers up to 3Kw continuous all-mode.
Furthermore, the coil is directly connected to DC ground (DC-Ground), thus atmospheric and impulsive disturbances are significantly reduced.
The UHF Connector
The connector is not a commercial SO-239 type as used by most manufacturers. The connector has been designed and manufactured directly by us, has a real impedance of 50 Ohm and is usable up to 500MHz. We have made a reliable connector capable of withstanding the transit of 5kW CW continuous at 30MHz and more than 3kW at 50MHz.
The body is made of nickel-plated CW614N brass, while the pin is plated in 24K gold to avoid oxidation and is equipped with a 4-fin insulator that maintains its centering and elasticity, avoiding contact losses.
The insulating part is made of PTFE which is one of the best insulating materials for its exceptional electrical (low dielectric constant, and low loss factor) and thermal (operating temperature from -100° to +260°) properties and is protected by a special elastomer cap which prevents water and humidity infiltration.
The Anchor Bracket
Made of 2.5 mm thick AISI304 stainless steel, it is fixed to the antenna tube using a clamp locking system, creating an extremely robust mechanical lock.
The fixing to the mast is made with M6 V-Bolts in AISI304 and column nuts to facilitate tightening.
HW20
Data sheet
- Mpn
- HW20
- Guy
- HF Verticali
- Specifications
- 1/2 d'onda, HF Banda 20m Full coverage, 3 kW, 10,7 m.
- Compatible brand
- Generico
- Sub-Categories
- HF Verticali
Specific References
- MPN
- HW20
