VHF Folded Dipole Stacked Arrays
Professional VHF folded dipole stacked arrays designed to provide added gain with flexible configuration options and minimal hardware. Available in 3dB and 6dB stacked array models, these antennas can be installed to achieve either omnidirectional or offset radiation patterns, with the offset configuration providing up to 3dB additional gain in the preferred direction.
Each folded dipole is mounted to a cast aluminium hub with centre-fed RG213 coax routed through the boom. The antenna is DC grounded and can be mounted to a vertical 48mm OD tube using a cross clamp. Down tilt can also be achieved by adding delay lines to the feed system.
Models PRO-FDVL-SA3, PRO-FDVL-SA6 & PRO-FDVH-SA3, PRO-FDVH-SA6
The VHF stacked array is designed to be used in different configurations, with minimal hardware. These arrays use our professional series folded dipoles in a stacked configuration to provide added gain.
The folded dipole assembly is mounted to a cast aluminium hub. The centre feed is taken out through the hub and a RG213 coax tail is fed down the centre of the boom. The antenna is DC grounded.
Mounting of the boom to a vertical 48mm OD tube can be achieved with a Cross Clamp. This allows the dipoles to be spaced from the mounting tube to provide an omnidirectional or offset radiation pattern. The offset pattern provides a further 3dB gain in the offset direction. This is shown in the radiation pattern below with “A” being the 1/4 wave offset and “B” the omnidirectional radiation pattern.
Down tilt can be provided by inserting delay lines in the feed system.
Items supplied for a 3dB stacked array – 2 x Dipoles, 1 x Power Divider (PD2)
Items supplied for a 6dB stacked array – 4 x Dipoles, 1 x Power Divider (PD4)
| Model | PRO-FDVL-SA3 | PRO-FDVL-SA6 | PRO-FDVH-SA3 | PRO-FDVH-SA6 |
| Number of Dipoles | 2 | 4 | 2 | 4 |
| Frequency Range (MHz) | 75-108 (see bandwidth) | 118-170 (see bandwidth) | ||
| Bandwidth (MHz) | 10 | 30 | ||
| Omnidirectional Gain (dBd) | 3 | 6 | 3 | 6 |
| Gain with Offset (dBd) | 6 | 9 | 6 | 9 |
| Half Power Beamwidth E Plane (deg) | 27 | 13 | 27 | 13 |
| Return Loss (dB & VSWR) | <-14dB 1.5:1 | |||
| Maximum Power (W) | 750 | |||
| Cable Type | RG213 | |||
| Boom Lenth (m) | 1.5 | 1 | ||
| Boom Diameter (mm) | 48 | 38 | ||
| Projected Area (m2) | 0.31 | 0.62 | 0.15 | 0.3 |
| Wind loading at 150km/h(N) | 340 | 680 | 165 | 330 |
| Weight (kg) | 9.2 | 18.4 | 4.2 | 8.4 |
