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INSTALLATION AND

MAINTENANCE MANUAL

for

Indoor Broadband Transmitter

Model: ITX21-100

Cable AML, Inc.

3427 W. Lomita Boulevard

Torrance, California 90505 USA

TEL 310 517-8888 or 702 363-5660

FAX 310 517-8555 or 702 363-2960

IM4030013-1 Rev – 20040713

Содержание ITX21-100

Страница 1: ...Cable AML Installation and Maintenance Manual Indoor Broadband Transmitter Model ITX21 100...

Страница 2: ...for Indoor Broadband Transmitter Model ITX21 100 Cable AML Inc 3427 W Lomita Boulevard Torrance California 90505 USA TEL 310 517 8888 or 702 363 5660 FAX 310 517 8555 or 702 363 2960 Copyright 2004 Ca...

Страница 3: ...iagnostic Circuits 8 2 5 On Delay Timer Assembly 8 3 0 INSTALLATION 9 3 1 Unpacking 9 3 2 Location 9 3 3 Input Voltage Requirements 9 3 4 Operating and Diagnostic Connections 9 4 0 OPERATION 13 4 1 Ou...

Страница 4: ...roadband Transmitter 2 2 ITX21 100 Component Layout 3 3 ITX21 100 Block Diagram 5 4 DC Diagnostics Switch Positions 8 5 Front Panel Connection Points 10 6 Rear Panel Connection Points 11 7 Output Leve...

Страница 5: ...he microwave modules are powered from a 12 VDC switching power supply The local oscillator is powered from a 12 VDC linear power supply A 24 VDC power supply powers the downconverter A 5 VDC voltage r...

Страница 6: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 2 Figure 1 ITX21 100 Broadband Transmitter...

Страница 7: ...013 1 Rev 3 On Delay Timer Circuit Upconverter Test Point 12 VDC Power Supply Output Circulator Local Oscillator Filter Local Oscillator Meter VHF Processor 12 VDC Fan Power Amp Underneath 24 VDC Powe...

Страница 8: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 4 This Page Intentionally Left Blank...

Страница 9: ...LATOR 87103 221 12VDC 5VDC 12VDC 12VDC 1 2 3 ISOL 87103 222 LOCAL OSCILLATOR 87225 013 MIXER 87202 019 G 8 dB F1 10A UPCONVERTER MONITOR TERM DIR COUPLER 87102 210 RF MON RF SAMPLE 1 7A 25A AC INPUT A...

Страница 10: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 6 This Page Intentionally Left Blank...

Страница 11: ...s also called an upper sideband upconverter The desired output of the upconverter is a signal at a frequency which is the sum of the local oscillator and VHF input frequencies The upconverter also gen...

Страница 12: ...from a sample of the microwave output of the power amplifier The downconversion is performed by an internal MDS downconverter with the same LO as the compact transmitter The transmitters output at mi...

Страница 13: ...ided to help with the weight of the transmitter should it be installed in a rack It should be placed near the rear of the transmitter 3 3 Input Voltage Requirements Cable AML transmitters can be equip...

Страница 14: ...dBmV Channel 21 0 dBm Channel Diagnostic Connections Diagnostic connections not essential to the normal operation of the transmitter are made at the front panel of the transmitter RF Diagnostics A typ...

Страница 15: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 11 Figure 6 Rear Panel Connection Points...

Страница 16: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 12 This Page Intentionally Left Black...

Страница 17: ...NOT RECOMMENDED TO CHANGE OR ADJUST THE TRANSMITTER OUTPUT LEVELS UNLESS THERE ARE SIGNIFICANT CHANGES IN THE NUMBER OF INPUT CHANNELS OR OTHER SYSTEM PARAMETERS A Microwave Power Meter or Spectrum A...

Страница 18: ...nditions are in the range specified in Section 6 0 Specifications 4 3 Thermal Sensor Switch To protect the power amplifier from overheating due to fan failure or excessive ambient temperature an inter...

Страница 19: ...smitter for motion If not operating then check the line fuse on the back panel 2 Frequency and level of the VHF input Incorrect input frequencies may produce output frequencies that are unable to pass...

Страница 20: ...k of 12 VDC If internal trouble shooting is required due to lack of 12 VDC in the external DC diagnostic test then check for internal 12 VDC on the terminal strips If either of these voltages is missi...

Страница 21: ...DRO is defective and should be replaced Source Power and Upconverter LO Power O K Reconnect all lines Disconnect the output line at the upconverter and measure its output at microwave If no or low ou...

Страница 22: ...Indoor Broadband Transmitter ITX21 100 IM4030013 1 Rev 18 This Page Intentionally Left Blank...

Страница 23: ...Response 1 dB Frequency Stability 0 0005 Input Return Loss 15 dB Input Connector Type F Output Return Loss 18 dB Output Connector Type N Temperature Range 60 to 100 F 16 to 38 C Humidity 95 max Prima...

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