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Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
    Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
    Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
    Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
    Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m
    Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m

Grazioli G-MAX Antenna Vertical Collinear Antenna 27-28.5 MHz, 5 kW, Height 10.85 m

Ref: GMAX

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€290.00
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Vertical Hill Antenna
Tuneable from 27 to 28.5 MHz
Powered at the base
Max Input Power: 5kW
Total Height: 10.85 m
Antenna weight: 6.8 Kg

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Description

G-Max is the world's first and only vertical antenna for the 10 or 11m bands in a 5/8λ above 1/4λ collinear configuration with high gain.

Built on the mechanics of the now proven FE10V, this antenna has exceptional performance comparable or superior to a 2 element Yagi, but with the advantage that G-Max is omnidirectional.

G-Max is incomparable to any other vertical antenna on the market, whether 5/8, J-Pole, or other types on the market.

Thanks to its high gain, compressed main lobe with low radiation angle, it will guarantee you performance never seen before.

NOTE : Supplied with a 3-point brace for wind bracing which we always recommend installing.

Electrical Data Mechanical Data
Type

GP Collinear 5/8λ above 1/4λ in phase

 Materials Cold drawn tube in AW6063-T66 Aluminum alloy, Fiberglass, Brass, PTFE. All screws in AISI-304 and 316 stainless steel
Frequency Range Tunable from 27 to 28.5 MHz Surface in the wind 0.34m 2
Impedance 50Ω Unbalanced Load @ 130Km/h 32.5Kgf
Radiation Omnidirectional Wind resistance (without ice) 130 km/h (against the wind)
Polarization Linear – Vertical Total Height 10.85m at 27MHz
I earn 3.5dBd – 5.65dBi Radial Length 2.7m (quarter wave)
Bandwidth at 2:1 SWR ≥ 1.3MHz @ 27MHz Mounting pole ø 40-54 mm
SWR in resonance ≤1.2 measured at connector Net Weight 6.8 kg
Max applicable power 5000 Watts continuous all modes of output Packaging Dimensions 14x14x145 cm
Diet Directly connected to ground in DC Weight in package 8.2Kg
Connector UHF female 50Ω with PTFE insulator, gold plated center pin
Materials and Construction

For our tubes we have used the best material available for the construction of antennas; it is the alloy of Aluminum, Magnesium and Silicon called AW6063-T66, tempered to the T-66 state. It gives the stylus an exceptional resistance, which is achieved by extrusion and subsequently by cold drawing.
Our tubular elements are extremely precise on both diameters, and also on the wall thickness, allowing for a precise fit with the least “play” between the tubes.
The “Ground Plane” is made up of 4 sturdy 2.7m long “Full-Quarter Wave” radials made in two telescopic sections with strap fastening, with diameter and thickness respectively 13×1.25mm and 10x1mm.
The radials are fixed to the support plate by means of two U-Bolts and self-locking nuts; in the fixing area, 4 fibreglass reinforcements are provided which strengthen the joints and prevent crushing.

Technical choices that make the difference
The world's only 10 or 11m Collinear Ground Plane

Grazioli “G-Max” is a high gain Collinear Ground Plane vertical antenna, the stylus is made in two distinct sections fed in phase via a special aluminum coil appropriately positioned on the stylus.
The power supply is direct and occurs in the lower part of the stylus which has a length of approximately 1/4λ, therefore via the rephasing coil the RF signal also supplies in phase the upper part which has a length of approximately 5/8λ.
The result is that the entire 10.3m long stylus radiates in phase with a gain of nearly 6dBi and a very low radiation angle (typically about 8°).
The Ground Plane is resonant with “Full Quarter Wave” radials which further enhance its performance, and further reduce the radiation angle.
Built on the mechanics of the now proven FE10V, this antenna has exceptional performance comparable or superior to a 2 element Yagi, but with the advantage that G-Max is omnidirectional.
NOTE: Supplied with a 3-attachment fifth wheel for bracing which we always recommend fitting.

Diagrams

The power factor correction coil


The G-Max coil has been carefully positioned at the ends of the two central radiating sections.

It performs three extremely important functions for this type of collinear antenna, the first has the task of delaying the phase of the RF signal by 180° between the first section at 1/4 Lambda and the second section at 5/8 Lambda, ensuring that the entire radiating part (whisk) radiates in phase.

The second function is to compensate for the strong capacitive reactance present on the upper part at 5/8 thanks to its intrinsic inductive reactance, and the third function is to transfer all the input power to the upper part without losses.

All this is made possible thanks to the high “Q” factor of our coil, designed to perform all three of the above mentioned functions in the best possible way.

The UHF Connector

The G-Max connector is not a commercial SO-239 type as used by most manufacturers. The connector was designed and manufactured directly by us, has a real impedance of 50 Ohm and is usable up to 500MHz. The goal was to make a reliable connector capable of withstanding 5Kw CW continuous at 30MHz.

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, 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. Finally, the connector is protected by a special elastomer cap that 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.
GMAX
2 Items

Data sheet

Mpn
G-MAX
Guy
C.B. Base
Specifications
27-28.5 MHz, 5 kW, Altezza 10,85 m
Compatible brand
Generico
Sub-Categories
C.B. Base

Specific References

MPN
G-MAX

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