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| Test Facilities |
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| To meet the growing demands of antenna requirements of the Indian Market, Astra Microwave Products Ltd., has installed two outdoor antenna test ranges viz, the short range and the long range. Both the ranges employ common Antenna Test Instrumentation for Radiation Pattern, Gain and Cross polarization discrimination, Axial Ratio measurements etc. Most sophisticated test instruments such as Spectrum Analyzer, Synthesized Signal Generator, Digital Pattern Recording System Azimuth over Elevation postioner etc. The above facilities can also be used for Accurate evaluation of Radome, Aircraft mounted antennas, Missile Mounted Antennas etc. |
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| Test Range Features |
| Astra Microwave Products Ltd., has installed two outdoor antenna test ranges with the following salient features. |
a) Ranges : Two out Door ranges (120Mtrs & 1000Mtrs)
b) Frequencies : 100 MHz to 20 GHz.
c) Measurement Type : Amplitude
d) Dynamic Ranges : 80 dB
e) Sensitivity : -124 dBm
f) Max. Weight of Antenna* : 1000 Kgs(Vertical Load)
g) Max. Size of Antenna** : 6 mtr (Nominal)
h) Positioner : Azimuth over Elevation.
i) Angle Resolution : 0.01°
j) Pattern Recorder : Digital Pattern Recorder
k) System : PC Based with Memory Capability |
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* 450 Kgs at an offset of 2 Mtrs
** Size is not a limitation, as long as the weight is with in 1000kgs. |
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| Antenna Test Instrumentation |
| The following instruments and accessories are employed in various test setups in the evaluation of antennas at AMPL. |
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1) Synthesized Microwave Sweeper HP. Model 83752A, 0.01 - 20 GHz - 1 No.
2) Spectrum, Analyzer,HP. Model 8563E, 9 KHz - 26.5 GHz - 1 No.
3) Azimuth over Elevation Positioner, FR Model AE 500E. - - 1 No.
4) Power Amplifier, 6 - Axis,FR Model 8601 AE - 1 No.
5) Positioner Cables, FR Model 910222 - 01, 910223 - 01 - 1 No.
6) Digital Pattern Recorder, FR Model 944 E - consisting of - I Set
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a. 80486 Computer
b. Color Monitor
c. Laser Printer
d. DPR Software.
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7) RF Cables, HP. Model 85381A - 5 M, 10 M long - 3 Nos.
8 ) Rotary Joint D.C. 18 GHz - 1 No.
9) System Interface unit - 1 No.
10) Scalar Network Analyzer HP. Model 8757E - 1 No. |
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| Return Loss And Isolation Measurement test Instrument |
| Two Scalar Network Analyzer Test Setups are available with Printer/Plotter outputs to carryout return Loss/VSWR, Insertion loss, Isolation measurements, in sweep and CW Frequency range of 0.01 to 20 GHz. |
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| Measurement Capability |
A) Antenna Measurement
1) Radiation Pattern.
E- plane
H- plane
Sum (S) Pattern, Difference (D) pattern
2) Gain.
3) Axial Ratio On axis and off axis.
4) Axial Ratio superimposed on Radiation pattern
5) Cross Polarization.
6) Front to Back lobe ratio.
7) Side lobe level.
8) Beam width 3dB & 10 dB.
9) Null Depth.
10) Position of Null.
11) Return Loss
12) Isolation
B) Radome Measurement
1) Loss
2) Shift in Beam Maximum.
3) Shift in Null Position.
4) Null Depth.
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C) Evaluation of Air Craft Mounted Antennas.
D) Evaluation of Missile mounted Antennas.
E) Evaluation of Ship Mount Antennas. |
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| Facilities to others |
The AMPL Antenna Test Range Facilities are also made available to other agencies on chargeable basis per day. The interested agencies may contact the marketing Department for more details. The Antenna Test Range Facilities are currently being used regularly by the following agencies.
1) AMPL, R & D.
2) AMPL, PRODUCTION.
3) BEL, HYD.
4) DRDL, HYD.
5) RCL, HYD.
6) SAMEER, BOMBAY.
7) CEL, DELHI.
8) ANDREW, U.K. |
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