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| CASSEGRAIN ANTENNAS |
IRTE Spa, a major Italian antenna manufacturer, introduces a range of Cassegrain antennas aimed at the reception of signals transmitted by geostationary satellites operating in the Ku band. Particular attention has been paid to the design, the choice of materials, and the manufacturing processes used by applying the extensive experience gained by IRTE Spa in the manufacturing of heavy-duty antennas for telecommunication and broadcast applications for various PTT authorities and other Customers throughout the world. The series EC means the use of a split reflector with diameter of 3, 4 mt. It has been designed and manufactured in order to combine the characteristics of lightness and of easy handling and transportation, with those of strength and resistance to the atmospheric agents required by outdoor use. The main reflector, made in aluminium, is formed by a single spun aluminium or stainless steel dish, reinforced with an aluminium ring and several aluminium or stainless steel ribs which improve the rigidity of the whole structure, and is painted in white matt in order to minimize the effects of the solar radiation on the reflector and on the feeder. Other colours are available upon request.
The reflector is supported by a ground mount, King-post type, made of hot-dip galvanized steel, with easy installation and high reliability.
The bolts, nuts and washers and all the details forming the adjustment system are made in stainless steel AISI 304. The adjustment is El/Az (Elevation over Azimuth) and permits high pointing accuracy and position keeping. |
Type EDLS 30/111 EC
Type EDLS 30/112 EC
Type EDLS 30/Tx-Rx
Type EMLS 40/111 EC
Type EMLS 40/112 EC
Type EMLS 40/Tx-Rx
and all of them are available with following wave guide flanges: UBR 120/PBR 120 for R 120/WR 75 wave guides and circular flanges for C-120 wave guides. |
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CASSEGRAIN ANTENNAS (TVRO) |
| Antenna Type |
EDLS 30/111 EC
EDLS 30/112 EC* |
EMLS 40/111 EC
EMLS 40/112 EC* |
| Feed type |
Cassegrain |
Cassegrain |
| Polarization |
Dual linear |
Dual linear |
| Frequency band (GHz) |
10.70÷11.70
10.70÷12.75* |
10.70÷11.70
10.70÷12.75* |
| Gain (dBi ±0.2 @ 10.95 GHz) |
49 |
51.5 |
| HPBW @ 11.3 GHz |
0.58° |
0.43° |
| XPD minimum (dB) on axis |
33 |
33 |
| Max VSWR |
1.30:1 |
1.30:1 |
| Antenna noise temperature (K)
@ feed interface |
|
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@ 10° elevation
|
51 |
50 |
@ 30° elevation
|
35 |
34 |
| @ 50° elevation |
31
|
30 |
| Input flange |
UBR 120 |
UBR 120 |
| * rejection Filter - Max Insertion Loss 0,4 dB - Minimum Isolation Tx/Rx 60 dB |
CASSEGRAIN ANTENNAS (TX-RX) |
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| Antenna Type |
EDLS 30/Tx-Rx |
EMLS 40/Tx-Rx |
| Feed type |
Cassegrain |
Cassegrain |
Polarization (Rx)
|
Dual linear |
Dual linear |
| Polarization (Tx) |
Single linear |
Single linear |
Receiving band (GHz)
|
10.70÷12.75 |
10.70÷12.75 |
| Transmitting band (GHz) |
14.00÷14.50 |
14.00÷14.50 |
Minimum Rx Gain (dBi)
|
49 |
51.5 |
| Minimum Tx Gain (dBi) |
51 |
53.5 |
| XPD minimum (dB) on axis |
33 |
33 |
| Minimum isolation Tx/Rx (dB) |
40 |
40 |
| Max VSWR |
1.35:1 |
1.35:1 |
| Antenna Noise temperature (K)
at feed interface |
|
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@ 10° elevation
|
51 |
50 |
@ 30° elevation
|
35 |
34 |
| @ 50° elevation |
31
|
30 |
| Input/output flange |
IEC PBR 120 |
IEC PBR 120 |
| Tx power handling capability (KW) |
2 |
2 |
| * rejection Filter - Max Insertion Loss 0,4 dB - Minimum Isolation Tx/Rx 60 dB |
CASSEGRAIN ANTENNAS EDLS 30
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| Main characteristics of the mechanical stresses
transmitted to the anchor points |
| Diameter of the main reflector |
3100 mm |
| Max zenith tilt |
70° |
| Max azimuth adjustment |
360° |
| Amplification factor of the wind-thrust |
C = 1.20 |
| Operational wind speed |
130 Km/h |
| Operational pressure of wind |
815 N/m2 |
| Amplified front thrust |
7382 N |
| Amplified side thrust |
1190 N |
| Weight of the main reflector including back structures |
950 N (97 Kg) |
| Weight of the other structures |
850 N (87 Kg) |
| Additional weight due to the presence of ice (thickness of ice 1" = 25.4mm) |
3500 N (357 Kg) |
| Max deviation of reference direction at operational wind speed |
0.08° |
| Position of the main reflector axis referred to the foundations |
1900 mm |
| Max overturning moment |
16.117 Nm |
| Dimensions of anchor bolts |
M 18 |
| Centre distance between anchor bolts |
300 mm |
| Max force on single anchor bolt |
25.536 N |
| Dimensions of foundations plinth |
(1,40x1,40x0,25)m3 |
| Dimensions of underpinning plinth |
(1,60x1,60x0,15)m3 |
| Suggested size of reinforcement rods |
30 Ø 12 |
Max wind speed, admissible in exceptional cases, with possible
permanent set of some parts |
160 Km/h |
| Max wind speed for physical survival of the antenna |
180 Km/h |
| Max admissible stretch on materials: |
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| A- with operational wind |
5/12.5/16 KN/cm2 |
| B- exceptionally, with max wind |
10/22/27 KN/cm2 |
| Material used in supporting structures |
AC100 / Fe33 / Fe37 |
CASSEGRAIN ANTENNAS EDLS 40
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| Main characteristics of the mechanical stresses transmitted to the anchor points |
| Diameter of the main reflector |
4130 mm |
| Max zenith tilt |
60° |
| Max azimuth adjustment |
360° |
| Amplification factor of the wind-thrust |
C = 1.32 |
| Operational wind speed |
160 Km/h |
| Operational pressure of wind |
1230 N/m2 |
| Amplified front thrust |
21,800 N |
| Amplified side thrust |
4,000 N |
| Weight of the main reflector including back structures |
3,000 N (305 kg) |
| Weight of the other structures |
2,600 N (265 kg) |
| Additional weight due to presence of ice(thickness of ice 1" = 25.4mm) |
8,300 N (844 kg) |
| Max deviation of reference direction at operational wind speed |
0,20° |
| Position of the main reflector axis referred to the foundations |
2380 mm |
| Max overturning moment |
57,790 Nm |
| Dimensions of anchor bolts |
M 33 |
| Centre distance between anchor bolts |
500 mm |
| Max force on single anchor bolt |
54,815 N |
| Dimensions of foundations plinth |
(2,00x2,00x0,3)m3 |
| Dimensions of underpinning plinth |
(2,50x2,50x0,6)m3 |
| Suggested size of reinforcement rods |
36 Ø 14 |
Max wind speed, admissible in exceptional cases, with possible
permanent set of some parts |
200 Km/h |
| Max wind speed for physical survival of the antenna |
240 Km/h |
| Max admissible stretch on materials: |
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| A- with operational wind |
12.5/16 KN/cm2 |
| B- exceptionally, with max wind |
22/27 KN/cm2 |
| Material used in supporting structures |
INOX AISI 304 / Fe33 / Fe37 |
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