Description
- 2x5/8 ? VHF collinear vertical antenna, tunable from 50 to 54 MHz with tuning chart.
- Antenna can also be configured in a short 5/8 ? version with a stilo length adjustment chart.
- Extremely robust construction in AW6063-T66 aluminum alloy.
- Supplied with high-quality INOX 304 and 316 stainless steel screws for long, rust-free service.
- The Ground plane is made with 4 full Quarter Wave radials.
- High input power capability, up to 2Kw continuous All-mode.
- Detailed assembly manual and serial number that identifies the production batch and construction data.
For our tubes, we used the best alloy available for antenna construction, AW6063-T66 Aluminum, Magnesium, and Silicon alloy tempered to T-66 state, which gives the stilo exceptional strength. It is made by extrusion and then cold drawn. Our tubes are extremely precise in both diameters and wall thickness, allowing for precise coupling with less "play" between the tubes.
The "Ground Plane" consists of 4 robust radials, 1.4m long, "Full-Quarter Wave," made of a single-section tube with a diameter and thickness of 13x1.25mm respectively. These are fixed to the support plate using two U-bolts and self-locking nuts. In the fastening area, 4 fiberglass reinforcements are provided to strengthen the joints and prevent the tubes from crushing.
Because an antenna that accepts high power 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 as heat, which happens with most competing products, but unfortunately, users cannot test this due to a lack of adequate equipment and instrumentation.
The high "Q" coil
The coil plays a fundamental role in impedance matching and maximum RF transfer. Its shape, determined by the length/diameter ratio, the spacing between turns, the material and diameter of the wire, and the presence or absence of metallic cores inside, determine its quality factor "Q" ("Q" = Quality factor).
In simple terms, the higher the "Q" of the coil, the lower the high-frequency losses. We have created a generously sized air-wound coil without metallic cores, with widely spaced turns, achieving one of the highest "Q" values.
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), which significantly reduces atmospheric disturbances and background noise.
The UHF Connector
The 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 Ohms, and can be used up to 500MHz. We have created a reliable connector capable of handling the passage of 5Kw continuous CW at 30MHz and more than 3Kw at 50MHz.
The body is constructed from nickel-plated CW614N brass, while the pin is 24K gold-plated to prevent oxidation and features a 4-flange insulator that maintains its centering and elasticity, preventing 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 properties (operating temperature from -100° to +260°).
Finally, the connector is protected by a special elastomer cap that prevents water and moisture infiltration.
The Mounting Bracket
Made of 2.5mm thick AISI304 stainless steel. It is fixed to the antenna tube using a clamp system, creating an extremely robust mechanical lock.
Mounting to the mast is done with M6 AISI304 V-bolts and column nuts for easier tightening.
