GRAZIOLI - HW20V - 1/2 WAVE VERTICAL ANTENNA -NO RADIALS- FULL COVERAGE OF 20 METERS BAND - WEIGHT: 5.4 kg - LENGHT: m 10.7 - POWER: 3000 W

Description

1/2 λ vertical antenna fed at the base, adjustable from 26 to 30 MHz by adjusting the length of the rod, and fine tuning at the base by means of a high voltage variable capacitor (40KV) isolated in PTFE.

Extremely robust construction in AW6063-T66 aluminum alloy and details made with CNC from solid.

Supplied with quality 304 and 316 stainless steel hardware for long service without rust.

High applicable input power, up to 3 kW continuous, All-mode.

Detailed assembly manual and serial number that identifies the production batch and construction data.
 

NOTE: Supplied with a 3-point clamp for guying which we always recommend installing. Always use non-conductive guying.

MATERIALS AND CONSTRUCTION

For our tubes we have used the best alloy that can be used for the construction of the antennas, the AW6063-T66 alloy of aluminium, magnesium and silicon hardened to the T-66 state which gives the stylus exceptional resistance, which is made by extrusion and subsequently cold drawn . Our tubes are extremely accurate on both diameters, and also on the wall thickness, allowing a precise coupling and with less "play" between the tubes.

THE CHOICES THAT MAKE THE DIFFERENCE

Why build an antenna capable of withstanding continuous power of 3 kW?
Because an antenna that accepts high powers 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 in heat, which happens with most competing products, but which unfortunately users cannot test due to lack of adequate equipment and instruments.

The high "Q" L-C matching circuit

For this product we have created a special parallel L-C circuit to be able to adapt the high impedance that this type of antenna has when fed to the base. The high Q coil is generously sized, suspended in air without metal cores, with widely spaced coils. The coaxial type variable capacitor (similar to a Gamma Match) placed next to the coil is made with PTFE insulation. It is capable of withstanding extremely high voltages above 40 KV, is not affected by ambient temperature, rain or humidity, and does not heat up if subjected to high powers; in addition it allows a 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 withstand RF power up to 3 kW continuous all-mode.
NOTE:
The coil is directly connected to direct current (DC-Ground). In this way atmospheric and impulsive disturbances are significantly reduced.
 

The UHF Connector

The HW10V's connector is not the commercial SO-239 type used by most manufacturers. The connector was designed and manufactured directly by us, has a real impedance of 50 Ohm and can be used up to 500MHz. The goal was to create a reliable connector capable of withstanding 5 kW CW continuous at 30MHz.

The body is made of Nickel plated CW614N brass, while the pin is 24K gold plated to avoid oxidation and equipped with a 4 bar insulator which maintains its centering and elasticity, avoiding loss of contact.

The insulating part is made of PTFE, one of the best insulating materials due to its exceptional electrical (low dielectric constant and reduced loss factor) and thermal (operating temperature from -100° to +260°) qualities. Finally, the connector is protected by a special elastomer cap which prevents infiltration of water and humidity.

The Anchor Bracket

Made of 2.5 mm thick AISI304 stainless steel. it is fixed to the antenna tube by means of a clamp closing system, creating an extremely robust mechanical block.

The fixing to the mast is made with V-Bolt M6 in AISI304 and column nuts to facilitate tightening.
 

TECHNICAL DATA