General Information
Page 1-2
Service Manual
MT930B
•
Front panel indication of satellite format, channel number,
upper/center/lower transponder channel, antenna polarity, audio subcarrier
frequencies, IF bandwidth, signal strength, and C/N ratio
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Remote and local control capability for all operating functions
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Four separate RF inputs
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70 MHz IF bandwidth selection capability of 16, 18, 22, 25, 27, or 36 MHz
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SAW technology for bandwidth filters
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Up to three internal audio subcarrier demodulators for #1, #2, and #3 audio
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Front panel 70 MHz IF test connector
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Connectors available for external insertion of notch filters in the 70 MHz IF
signal path
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Built-in current-limited 13 / 18 Vdc with ON / OFF for powering low-noise
block downconverters (LNBC)s and low-noise amplifiers (LNA)s
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Front panel analog meter that displays signal strength in dBm, C/N ratio,
and RF fine-tuning
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Output for remote display of signal strength
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Standard Communications' Gold Standard Support Program, 7-year
Guarantee, and Lifetime Loaner Program
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Internal nonvolatile memory for automatic selection of the following:
Transponder center frequencies
Six different 70 MHz IF bandpass filters
Antenna polarity for each channel
Audio subcarrier center frequency
Audio subcarrier bandwidth
Audio subcarrier de-emphasis values
Video polarity
Documented RS250B (satellite) broadcast proof-of-performance and
certification
Computer interface makes tracking possible and setting of multiple
receivers either on-site or remotely, using a personal computer
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Rebroadcast-quality, certified performance on NTSC, PAL, SECAM, and
MAC signals
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Precision microprocessor-controlled, dual-conversion, PLL RF tuning
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Digital AFC tracking circuit with continuous fine-tuning ability
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70 MHz IF with spectrum inversion circuit for uplink turnarounds
Summary of Contents for mt930b
Page 3: ...MT930B Service Manual Page i ...
Page 10: ...General Information Page 1 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 22: ...Controls and Connections Page 3 4 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 86: ...Options Maintenance Page 7 2 Service Manual MT930B THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 90: ...Drawings Page 9 2 Service Manual MT930B 10264 Figure 9 1 MT930B Block Diagram 1 ...
Page 91: ...Drawings MT930B Service Manual Page 9 3 10265 Figure 9 2 MT930B Block Diagram 2 ...
Page 92: ...Drawings Page 9 4 Service Manual MT930B 10266 Figure 9 3 MT930B Block Diagram 3 ...
Page 93: ...Drawings MT930B Service Manual Page 9 5 10267 Figure 9 4 MT930B Block Diagram 4 ...
Page 94: ...Drawings Page 9 6 Service Manual MT930B 10268 Figure 9 5 MT930B Head Phone Schematic ...
Page 95: ...Drawings MT930B Service Manual Page 9 7 10269 Figure 9 6 MT930B RF PC Board Schematic ...
Page 96: ...Drawings Page 9 8 Service Manual MT930B 10270 Figure 9 7 MT930B Converter Module Schematic ...
Page 97: ...Drawings MT930B Service Manual Page 9 9 10271 Figure 9 8 MT930B Main PC Board Sheet 1 of 3 ...
Page 98: ...Drawings Page 9 10 Service Manual MT930B Figure 9 9 MT930B Main PC Board Sheet 2 of 3 ...
Page 99: ...Drawings MT930B Service Manual Page 9 11 10273 Figure 9 10 MT930B Main PC Board Sheet 3 of 3 ...
Page 100: ...Drawings Page 9 12 Service Manual MT930B 10274 Figure 9 11 MT930B Power Supply Schematic ...
Page 101: ...Drawings MT930B Service Manual Page 9 13 10275 Figure 9 12 MT930B IF Filter Block Schematic ...
Page 102: ...Drawings Page9 14 Service Manual MT930B 10276 Figure 9 13 MT930B Audio IF PB01 Schematic ...
Page 103: ...Drawings MT930B Service Manual Page 9 15 10277 Figure 9 14 MT930B Audio Out Schematic ...