7.5m Tri-Band Carbon-Fibre X/Y Antenna for LEO/MEO Tracking & Telemetry
The PXY-750 is a 7.5 m ring-focus tri-band S/X/Ka telemetry, tracking and command antenna on a full X/Y pedestal. The X/Y geometry gives complete hemispheric coverage with no cone of silence at zenith, so low- and medium-orbit satellites are followed continuously through overhead passes. A tri-band S/X/Ka feed with TE21 multimode monopulse tracking network provides simultaneous LHCP and RHCP data reception on every band and real-time switching between S, X and Ka tracking without loss of lock - S-band TT&C and X- or Ka-band mission data are handled by one antenna.
Carbon-Fibre Reflector, Backlash-Free Drive
The main reflector, radial support frames and ring beams are all carbon-fibre composite, co-cured as single units on a steel central hub. The result is a 16-segment reflector with 0.25 mm RMS surface accuracy, 30–60% lighter than an equivalent aluminium dish, near-zero thermal expansion under diurnal and solar loading, and full resistance to salt-spray corrosion. Each X and Y axis is driven by two motors through a dual worm-gear backlash-elimination transmission, sharing load between drives and delivering 0.001° angular resolution with better-than-0.002° measurement accuracy.
- 7.5 m aperture, tri-band S/X/Ka operation
- Tri-band S/X/Ka feed, multimode monopulse tracking
- X/Y pedestal - full hemisphere, no zenith keyhole
- Simultaneous LHCP + RHCP data reception on S, X and Ka
- Automatic S / X / Ka tracking hand-over, uninterrupted lock
- Dual-motor backlash-free worm-gear drive on both axes
- Acquisition at 3º elevation, stable tracking from 5°
- Pre-positioning and automatic stow
- RadomeOPTIONAL
| GENERAL SPECIFICATIONS | PXY-750 | ||
| Reflector Diameter | 7.50m | ||
| Mount Type | Elevation over Azimuth or X/Y | ||
| Feed Type | S/X band monopulse capability | ||
| RF Characteristics | S-Band | X-Band | Ka-Band |
| Frequency (GHz) Tx | 2.025 - 2.120 | 7.145 - 7.250 | 30.0 - 31.0 |
| Frequency (GHz) Rx | 2.200 - 2.300 | 7.750 - 8.500 | 20.2 - 21.2 |
| G/T @ 10° Elevation (dB/K) (clear sky, 23 °C, at LNA output) | ≥ 19.1 | ≥ 32 | ≥ 36.4 |
| Gain Tx (dBi) | ≥ 40.5 | ≥ 52.8 | ≥ 64.4 |
| Polarization Tx | LHCP / RHCP (Switchable) | LHCP / RHCP (Switchable) | LHCP / RHCP (Switchable) |
| Polarization Rx | LHCP / RHCP (Simultaneous) | LHCP & RHCP (Simultaneous) | LHCP / RHCP (Simultaneous) |
| Axial Ratio (dB) | ≤ 1.2 | ≤ 1.0 | ≤ 1.0 |
| VSWR | ≤ 1.5:1 | ≤ 1.5:1 | ≤ 1.5:1 |
| Tx/Rx Isolation (dB) (at Tx freq.) | ≥ 90 | ≥ 90 | ≥ 90 |
| Rx Polarization Isolation (dB) | ≥ 20 | ≥ 20 | ≥ 20 |
| Sum / Difference Channel Isolation (dB) | ≥ 30 | ≥ 30 | ≥ 30 |
| First Sidelobe Level (dB) | ≤ -14 | ≤ -14 | ≤ -14 |
| Difference-beam Null Depth (dB) | ≥ 35 | ≥ 35 | ≥ 35 |
| IF Interface | 70 MHz (TT&C / Tracking) | 1.2 GHz (data), 70 MHz (Tracking) | 1.2 GHz (data), 70 MHz (Tracking) |
| Pointing Accuracy (R.M.S.) | ≤ 0.16° | ≤ 0.045° | ≤ 0.012° |
| Tracking Accuracy (R.M.S.) | ≤ 0.13° | ≤ 0.035° | ≤ 0.01° |
| Antenna Pattern Compliance | ITU-R S.580-6 & S.465-6 | ITU-R S.580-6 & S.465-6 | ITU-R S.580-6 & S.465-6 |
| MECHANICAL SPECIFICATIONS | X | Y | |
| Travel Range | ± 90° | ± 90° | |
| Maximum Velocity | ≥ 5°/s | ≥ 5°/s | |
| Maximum Acceleration | 10°/s² | 10°/s² | |
| Drive | Dual-motor backlash-free worm gear | Dual-motor backlash-free worm gear | |
| ENVIRONMENTAL SPECIFICATION | |||
| Wind Speed Operational | 90 km/h | ||
| Wind Speed Survival | 240 km/h survival | ||
| Temperature Range Operational | -40 °C to +55 °C | ||
| Temperature Range Storage | -45 °C to +70 °C | ||
| Lightning Protection | Independent lightning rods, grounding ≤ 4 Ω (equipment) / ≤ 10 Ω (lightning tower), SPDs on all lines | ||
| Humidity | 0 to 100% | ||
| Radome | Optional | ||
