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Noise Figure Test Set
The Sandersl 5440C Noise Figure Test Set is a lightweight, compact, portable instrument capable of measuring noise figure from 2 to 32 dB over a range of 10 KHz to 40 GHz. The 5440C can operate from either the IF output or video/audio output of the system under test. A built-in IF preselector excludes spurious signals which are often present at the IF output of a system. The preselector is continuously variable and
accepts IF signals From 10 MHz to 200 MHz. The IF input is under AGC control which assures accurate readings as the system under test is tuned across its band.
The noise source can be placed up to 300 feet from the test set, permitting the entire system (antenna lines, pre-amps, TWTs,
couplers, rotary joints and interconnecting lines) to be included in the noise figure. The noise source can be connected before or after a suspect unit or cable to quickly isolate defective components in tile front end chain. The noise source can be permanently mounted in the system using coaxial switches or directional couplers.
Features
- Continuously variable IF input frequency, 10 to 200 MHz
- Operates from video or IF output
- Accurate, rapid, portable test set for measuring receiver sensitivity
- Direct digital readout of noise figure in dB
- LED indicators alert operator of improper gain or excess noise settings
- Linear output for X-Y plotter
Applications
- Receiving system check-out (RF through video)
- On-line performance monitoring
- Preamplifier and TWT evaluation
- Rapid verification of large ECM and communications receiving systems
Specifications
| Receiving System RF Range |
10 KHz to 40 GHz, depending on noise source |
| Noise Source Drive Voltage |
+22 Volts standard |
| Noise Figure Measuring Range |
2 to 32 dB |
| Indicators |
Input too high |
| Input too high |
| Excess noise selected too high |
| Excess noise selected too low |
| Input Requirements |
| Video |
Band-limited noise, representative of the envelope of the IF signal to within ±1 dB over a 12 dB minimum dynamic range with an RMS voltage adjustable to 100 mV minimum, and with frequency components higher than 3 kHz |
| IF: Linear, nonsaturating, band-limited noise |
Frequency: |
10 to 200 MHz |
| Sensitivity: |
-50 dBm minimum |
| AGC Range: |
40 dB |
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