Grazioli FE62V

Grazioli – FE62V
The Grazioli FE62V is a vertical 2 x 5/8 λ collinear VHF antenna, tunable from 50 to 54 MHz using the supplied tuning chart. The antenna can also be configured as a shorter 5/8 λ version, with a dedicated chart for adjusting the whip length.

The antenna features an extremely robust construction made of AW6063-T66 aluminium alloy, ensuring durability even in demanding environments.

All mounting hardware is made of high-quality 304 and 316 stainless steel, providing long-lasting corrosion resistance and ensuring a rust-free service life.

The ground plane consists of four full-size quarter-wave radials, ensuring stable performance.

Suitable for high input power levels of up to 2 kW continuous power in all operating modes.

Each unit is supplied with a detailed assembly manual and a unique serial number for identification of the production batch and manufacturing details.

High-Q Coil
The coil plays a key role in impedance matching and achieving maximum RF power transfer.
The Q factor (quality factor) is determined by the length-to-diameter ratio, the spacing between turns, the material, the wire diameter, and the presence or absence of metal cores. Simply put, the higher the Q factor of the coil, the lower the losses at high frequencies. We have designed an oversized coil suspended in free air, without any metal cores and with widely spaced turns, achieving one of the highest technically possible Q values. This ensures maximum efficiency and the ability to withstand high RF power levels. In addition, the coil is directly DC-grounded to significantly reduce atmospheric interference and background noise.

UHF Connector
The antenna connector is not the commercially available SO-239 type used by most manufacturers. Our connector has been designed and manufactured in-house. It provides a true 50-ohm impedance and is suitable for frequencies up to 500 MHz. We have developed a highly reliable connector capable of handling 2 kW of continuous RF power at 30 MHz and over 3 kW at 50 MHz. The housing is made of nickel-plated CW614N brass, while the centre pin is plated with 24-karat gold to prevent oxidation. It features a four-fin insulator that maintains proper centring and elasticity, preventing contact losses. The insulating material is PTFE, one of the finest insulating materials available thanks to its exceptional electrical and thermal properties (low dielectric constant and low dissipation factor, with an operating temperature range of -100 to +260 °C). The entire assembly is protected by a special elastomer cap that prevents water and moisture ingress.

Adjustable frequency range from 50 to 54 MHz
50Ω unbalanced impedance
Omnidirectional radiation
Vertical polarisation
Gain from : 3.5dBd – 5.65dBi
Resonant SWR ≤1.2 : 1 measured at the connector
Bandwidth 2.6 MHz to 50 MHz with SWR <2
Maximum applicable power of 2000 Watts continuous all transmission mode
Power system: High Q power coil connected to DC earth
Connector: 50 Ω female UHF with PTFE insulation, gold-plated centre pin
The FE6V2 connector is not the commercial grade SO-239 used by most manufacturers. The connector was designed and built directly by Grazioli, has a true impedance of 50 Ohms and can be used up to 500 MHz.

The body is made of CW614N nickel-plated brass, while the pin is plated with 24-carat gold to prevent oxidation and fitted with a 4-fin insulator that maintains its centring and elasticity, preventing contact losses.

The insulating part is made of PTFE, one of the best insulating materials because of its exceptional electrical (low dielectric constant and low loss factor) and thermal (operating temperature from -100° to +260°) properties.

Finally, the connector is protected by a special elastomer cap that prevents the ingress of water and moisture.

Specifications:
Materials: AW6063-T66 aluminium alloy tube, fibreglass, brass, PTFE, stainless steel screws
Wind surface area: 0.195m2
Wind load at 130Km/h: 19Kgf
Wind resistance: 130 Km/h
Total height: 8.12m at 50MHz
Radial length: 1.4m (1/4 wave)
Mast mounting: ø 40-54 mm
Net weight: 4.3 Kg