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Maintenance
Page 6-4
Service Manual
MT930B
Input Isolation Measurement
Measurement Conditions:
•
Set the equipment up as in Figure 6-2.
•
Input: 950 to 2150 MHz –10 dBm (75
Ω
)
10298
Figure 6-2. Equipment Setup for Input Isolation Measurement
Measurement Procedure:
1. Make sure the front panel RF port is set to 1.
2. When connecting 1 to 4, read at 3 and 4; connecting 2 to 1, read between 3
and 4, connecting 3 to 1, read between 2 and 4; connecting 4 to 1, read be-
tween 2 and 3.
3. Connect the signal generator to RF Input port #1, and measure the leakage
to ports 2 through 4. The amount should be the reference level (–10 dBm)
minus the leakage signal level.
4. Use the worst reading as the measured value. Note that there is a tendency
for the worst measured value to appear near 1.8 or 2.1 GHz.
5. Measure the isolation of ports 2–4 as in steps 1 through 3
Measurement Specification:
−−−−
Input Isolation (950 to 2150 MHz):
≥≥≥≥
40 dB
Содержание mt930b
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Страница 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
Страница 91: ...Drawings MT930B Service Manual Page 9 3 10265 Figure 9 2 MT930B Block Diagram 2 ...
Страница 92: ...Drawings Page 9 4 Service Manual MT930B 10266 Figure 9 3 MT930B Block Diagram 3 ...
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 ...