Description
FE10V: The Grazioli FE10V is a high-performance 5/8 λ vertical antenna engineered for the 10m and 11m bands. Built to withstand 5kW CW continuous power, it delivers exceptional durability, low-angle radiation, and unmatched efficiency for serious DXers and high-power operators.
The high “Q” Coil:
The coil plays a fundamental role for impedance matching and maximum RF transfer, its shape given by the length / diameter ratio, the pitch between turns, the material and diameter of the wire and the presence or absence of metal cores within it, determine the quality factor “Q”. In simple terms, the higher is the “Q” value of the coil, the lower is the losses at high frequency.
We have created a generously sized coil suspended in the air without metal cores, with an L / D ratio of 1.3 and widely spaced turns, obtaining a “Q” value of about 2500 at a frequency of 28MHz, when the best competing antennas do not reach 1500. This translates into maximum efficiency, and the ability to withstand high RF powers.
In addition, the coil is directly connected to ground in direct current (DC-Ground), in this way atmospheric disturbances and background noises are significantly reduced.
UHF Connector:
The FE10V connector is not a commercial SO-239 type connector as most manufacturers use. The connector was designed and built directly by us, has a real impedance of 50 Ohms and can be used up to 500 MHz. The goal was to create a reliable connector capable of withstanding 5kW CW continuous at 30 MHz. The body is made of CW614N nickel-plated brass, while the pin is plated in 24K gold to avoid oxidation and 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 due to its exceptional electrical (low dielectric constant, and reduced loss factor) and thermal (operating temperature from -100 ° to + 260 °) and is protected from a special elastomer hood that prevents water and humidity infiltration.
The fixing bracket:
Made of 2.5mm thick AISI304 stainless steel, it is fixed to the antenna tube by means of a clamp closure system, creating an extremely strong mechanical locking. Fixing to the mast is made with AISI304 M6 V-Bolt and high type nuts to facilitate tightening.
Specifications:
Adjustable frequency range from 26 to 28 MHz
Feed system high-Q air wound matching coil, DC-Ground
50Ω unbalanced impedance
Omnidirectional radiation
Vertical polarization
Gain of 1.5 dBd – 3.65 dBi
Resonant SWR ≤1.2 : 1 measured at the connector
Maximum applicable power of 5000 Watts continuous all transmit mode
Power System: High Q coil power supply connected to DC ground
Connector: 50 Ω female UHF with PTFE insulation, gold-plated Centre pin
Materials: AW6063-T66 aluminum alloy tube, fibreglass, brass, PTFE, stainless steel screws
Wind surface: 0.29m2
Wind load at 130Km/h: 280N – 28.5Kgf
Wind resistance: 130 Km/h
Total height: 7.63m at 26MHz
Radial length: 2.7m (1/4 wave)
Mast mounting: ø 40-54 mm
Weight in package: 7.3 kg
Antenna Weight : 6 Kg
