GRAZIOLI - MV6 - 6 BAND: 6-10-12-15-17-20 METERS VERTICAL ANTENNA - NO TRAPS - WEIGHT: 7.8 kg - LENGHT: m 6.75 - POWER: 3000 W

DESCRIPTION

Base fed 1/4 λ Ground Plane multiband vertical antenna for the following HAM bands: 20, 17, 15 12, 10 and 6m.

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.

MATERIALS AND CONSTRUCTION

For our tubes we have used the best material that can be used for the construction of the antennas; it is the aluminium, magnesium and silicon alloy called AW6063-T66, hardened to the T-66 state. It gives the stylus exceptional resistance, which is achieved by extrusion and subsequently cold drawn.
Of extremely robust construction, the central stem uses tubes with a diameter of 42x2mm at the base, and a diameter of 19x1.25mm at the tip, while the lateral stubs and the radials of the ground plane are made of telescopic tubes with a diameter of 13 and 10mm.
The ground plane is formed by 4 horizontal radials about 2.7m long, and the vertical stubs are held in position by 3 crosspieces, the first connected to the base of the stylus is made of rectangular section aluminum tubes machined with CNC machines, and the other 2 in thermoplastic material, one with 4 arms in the middle part, and one with 2 arms in the upper part.
All the screws are made of stainless steel, the pipes are fixed with sturdy quality AISl-316 stainless steel clamps, the brackets, the screws, and the U-bolt and V-bolt U-bolts are in AISl-304 stainless steel.

A performing and robust antenna with the standards of the Grazioli brand

The basic idea was to create an efficient antenna, without the use of traps which reduce its efficiency, and without the use of impedance transformers which limit the applicable power.
Starting from these assumptions, we have created MV6, which by using parallel resonant elements (stubs) to the central whip, have allowed us to create an efficient antenna on all covered bands.

A high performance multiband

The stylus is composed of a central radiator for the lowest band of 20m flanked by 4 side stubs that resonate on the highest bands 17,15,12,10 + VHF 6m. The side stubs are a full 1/4 wave long with no traps that would reduce their efficiency. The antenna is powered directly without the use of adapters or impedance transformers which would introduce losses and limit the applicable power, it is equipped with a high impedance inductance which creates a DC short circuit, dispersing to ground any disturbances caused by atmospheric events and/or electrostatic discharges.
The calibration is carried out by adjusting the telescopic parts of the stubs and the central stylus, each frequency is independent and does not give interactions on the other bands, except for the 17m band which also determines the resonance of the 6m: We recommend the use of a d Rig-Expert or Nano VNA type graphic antenna which makes calibration much easier.

NOTE:
If used in very windy areas, bracing with NON-conductive cables using the washer supplied is recommended.
It is recommended to use a CHOKE (not supplied) to be installed immediately under the connector to avoid possible RF feedback on the coaxial.

The UHF Connector
The connector is non-commercial SO-239 as 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. We have created a connector that is reliable and able to withstand the transit of 5 kW CW continuous at 30MHz and more than 3 kW at 50MHz.

The body is made of nickel plated CW614N brass, while the pin is plated in 24K gold 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 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°) qualities and is protected by a special elastomer cap that prevents infiltrations 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