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Maintenance
MT930B
Service Manual
Page 6-5
Noise Figure Measurement
Measurement Conditions:
•
Set the equipment up as in Figure 6-3.
•
Start: 50 MHz
•
Stop: 90 MHz
•
Step size: 2 MHz
•
LO (local oscillator) frequency (3.1 SP): Receiving fre 70 MHz
(set each time the channel is changed)
•
Measurement mode: 1.4 SP. (external fixed LO)
•
Loss compensation: ON (34.1 SP)
•
Noise source – greatest loss between UUTs (34.2 SP): 6.0 dB
•
Absolute temperature of object having loss (34.3 SP): 300
°
K
(273
°
+ room temperature). Loss between meter (34.4 SP): 6 dB
(perform calibration in NF and gain (measurement mode)
•
MGC: Max, AFC OFF
•
AFC: ON, AGC OFF
•
MGC: MAX
•
Test frequencies: 950, 1250, 1500, 2150 MHz
10299
Figure 6-3. Noise Figure Gain Variation Equipment Setup
Measurement Procedure:
1.
Calibrate the equipment after inputting the LO data (receive frequency
+ 70 MHz). It will not be necessary to recalibrate for each frequency.
2.
Connect the UUT, set the receive frequency, and read the NF (noise figure)
value at 70 MHz.
3.
Use the worst reading as the measured values. Note that there is a ten-
dency for the worst measured value to appear near 2.0 GHz.
4.
Change the test frequency, update the LO data, and measure NF at each
frequency.
Measurement Specification:
−−−−
Noise Figure:
≤≤≤≤
15 dB
Содержание mt930b
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Страница 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
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Страница 93: ...Drawings MT930B Service Manual Page 9 5 10267 Figure 9 4 MT930B Block Diagram 4 ...
Страница 94: ...Drawings Page 9 6 Service Manual MT930B 10268 Figure 9 5 MT930B Head Phone Schematic ...
Страница 95: ...Drawings MT930B Service Manual Page 9 7 10269 Figure 9 6 MT930B RF PC Board Schematic ...
Страница 96: ...Drawings Page 9 8 Service Manual MT930B 10270 Figure 9 7 MT930B Converter Module Schematic ...
Страница 97: ...Drawings MT930B Service Manual Page 9 9 10271 Figure 9 8 MT930B Main PC Board Sheet 1 of 3 ...
Страница 98: ...Drawings Page 9 10 Service Manual MT930B Figure 9 9 MT930B Main PC Board Sheet 2 of 3 ...
Страница 99: ...Drawings MT930B Service Manual Page 9 11 10273 Figure 9 10 MT930B Main PC Board Sheet 3 of 3 ...
Страница 100: ...Drawings Page 9 12 Service Manual MT930B 10274 Figure 9 11 MT930B Power Supply Schematic ...
Страница 101: ...Drawings MT930B Service Manual Page 9 13 10275 Figure 9 12 MT930B IF Filter Block Schematic ...
Страница 102: ...Drawings Page9 14 Service Manual MT930B 10276 Figure 9 13 MT930B Audio IF PB01 Schematic ...
Страница 103: ...Drawings MT930B Service Manual Page 9 15 10277 Figure 9 14 MT930B Audio Out Schematic ...
Страница 104: ...Drawings Page 9 16 Service Manual MT930B 10278 Figure 9 15 MT930B Audio PW01 PC Board Schematic ...