ELECTRICAL AND MECHANICAL CHARACTERISTICS
| Frequency Range | 87 – 108 MHz |
| Cain (ref to. λ /2 dipole) | 0.7 times (-1.5 dB) |
| Circularity in free space | ± 1 dB |
| Impedance | 50 ohm |
| V.S.W.R | < 1,3 % |
| Max. Input Power | see table below |
| Polarization | circular |
| Input Connector | EIA Standard |
| Weight of the Antenna | 7 Kg (clamps included) |
| Wind load 160 Km/h | 930 N |
| Max wind velocity | 200 Km/h |
| Material : * Supporting element & dipoles copper conductor * Insulating parts * Bolts and nuts | Brass and copper Teflon Stainless Steel |
| Grounding | All metallic parts are DC grounded (lightning protected) |
- Wideband, suitable for multi-station
- Circularly polarized
- Arrays to 16 sections
- Pole or tower-leg mount
- VSWR field adjustable
This MS-1 series of antenna are circularly polarized elements with a power rating of 18 kW per section and available in stacked arrays of up to 16 sections with an input rating to 40 kW. Special arrays suitable for multi-stations operations and/or having higher power input ratings are available.
GENERAL SPECIFICATIONS
| Polarization | Circular |
| Horizontal Pattern Circularity in Free Space | ± 1 dB |
| Vertical Pattern Circularity in Free Space | ± 1 dB |
| VSWR at input, top mounted, w/o field trim | 1.2 : 1 max |
| VSWR at input, side mounted, w/o field trim | 1.5 : 1 max |
| VSWR at input, top or side mount : * with field trim ( ± 200 kHz.) * with field trim ( ± 400 kHz.) | 1.05 : 1 1.10 : 1 |
| Input connection diameter (50 ohm, EIA-flange) | Various |
| Input power rating (in kilowatts) | See Elec. Data Chart |
| Wind Load | See Mech. Data Chart |
| Feed point locations (Approx.) : * Seven sections and fewer (below lowest section) * Eight sections and more (below array center) | 10.5′ (3.6m) 13′ (4 m) |
Beam Tilt and Null Fill, Directional Arrays
Beam Tilt and/or null fill are optional extras on the MS-1 series. These options are ordinarily specified for the larger arrays (eight sections and more). However, even numbered arrays of six sections and fewer may include one or both options. When such is the case, the array is supplied as center-fed system (rather than end-fed) at additional expense.
The MS-1 series antenna is available in directional arrays which are custom-built to the needs of the directivity situation.
High Power Input Capability
The MS-1 series antenna is available at extra cost with 4 1/6 feed system having a power input rating (for five or more bays) of 80 kW.
Multi Station Operation
The wide bandwidth and high power input capability of the MS-1 antenna permits multi-station operation at extra cost.
Dual station antennas having a frequency separation of less than 3.0 MHz employ a standard shunt feed system.
Multi-station antennas for two or more stations within a 5.0 MHz bandwidth employ a branch feed system. Branch feed systems are also employed for multi-station antennas requiring null fill beam tilt.
ELECTRICAL DATA
0 Power gain each polarization.
² Effective free-space field intensity at 1 mile (1.604 km) in mV/m for 1 kW antenna input power for either equivalent horizontally polarized component or equivalent vertically polarized component.
³ Power rating based on 40°C ambient. Multiply values listed by 0.8 for 50°C ambient. MS-3 and larger antenna with greater power ratings are available by special order.