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MXD5U OPERATIONS AND MAINTENANCE

1 AMPLIFIER

The RF section of the MXD5U Amplifier consists of a heatsink assembly that includes three cascaded broadband
amplifier modules and a directional coupler. Figure 1 shows the layout of this assembly.

Figure 1 MXD5U Amplifier Heatsink Assembly

Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions.

PUB09-03 Rev 0 April 16, 2009

09-03-1

MXD5U Operations and Maintenance

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Содержание Larcan MXD5U

Страница 1: ...MXD5U AMPLIFIER TECHNICAL SERVICE MANUAL LARCAN INC 228 AMBASSADOR DRIVE MISSISSAUGA ONTARIO CANADA L5T 2J2 PHONE 905 564 9222 FAX 905 564 9244 EMAIL techservices larcan com PUB09 03 Rev 0 16 April 2009 ...

Страница 2: ...S 11 4 1 1 Front End Module Bench Test Procedure 11 4 1 2 IPA1 Bench Test Procedure 11 4 1 3 Pallet 21B1751 Bench Test Procedure 11 4 2 BASIC TROUBLESHOOTING TECHNIQUES 12 4 2 1 Amplifier Completely OFF 12 4 2 2 No RF Output 12 4 2 3 Output Reduced to 25 12 5 MAINTENANCE 13 5 1 DAILY 13 5 2 MONTHLY 13 5 3 SEMI ANNUALLY AND ANNUALLY 13 5 4 TRANSMITTER COOLING SYSTEM 13 6 TEST EQUIPMENT SETUP 14 7 S...

Страница 3: ...TEST EQUIPMENT SETUP 14 FIGURE 9 FRONT END AMPLIFIER MXD5U 16 FIGURE 10 IPA ASSEMBLY MXD5U 17 FIGURE 11 AMPLIFIER PALLET MXD5U 18 FIGURE 12 MXD5U CONTROL BOARD ASSEMBLY 19 PUB09 03 Rev 0 April 16 2009 09 03 ii MXi005U Operations and Maintenance ...

Страница 4: ...ree cascaded broadband amplifier modules and a directional coupler Figure 1 shows the layout of this assembly Figure 1 MXD5U Amplifier Heatsink Assembly Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions PUB09 03 Rev 0 April 16 2009 09 03 1 MXD5U Operations and Maintenance ...

Страница 5: ... Circuitry to control and monitor the 28V power supply is also included on this board Figure 3 Front Panel 2 1 CONTROL BOARD ASSEMBLY AND JUMPER SETTINGS Figure 9 shows the assembly diagram for the control board Part No 31C1897A2 that performs all the control monitoring RF detection and communication functions There are a number of jumpers on this board that are factory set and should not be alter...

Страница 6: ...ter Setting no jumper installed E8 Not installed in this assembly E9 Not installed in this assembly E10 Not installed in this assembly E11 Forward Power Sample Gain Sets either High or Low gain from the DC sample received from the RF coupler Set to obtain a voltage between 4 5 and 8V at TP2 for full power RF output Can be either in the HI or LO position depending on channel and RF coupler Typical ...

Страница 7: ... the filter output calibrating to a 5W level installation and alterations of test loads are done at the filter output not transmitter RF Output PLEASE NOTE SAFETY WARNING ABOVE Connect a jumper wire across the terminals of the INT K External Interlock terminal block at the rear panel This is temporary and must be removed when tests are completed Confirm Amplifier Bias Terminate RF Out with 50R min...

Страница 8: ... of two positions one labeled INT and the other position EXT When the jumper E5 is in position INT then the transmitter will ignore any ON or OFF remote controls This remote controls can either come from the serial communication program or from the external remote control connector on the rear of the transmitter chassis Please note that only the ON and OFF remote controls are disabled and the AGC ...

Страница 9: ... all these remote commands are active low and require a short to ground Figure 4 Remote Command Inputs 2 4 2 Remote Telemetry Outputs There are only four remote telemetries available to the operator these being RF forward power RF reflected power AGC voltage and Cutback voltage In the table of remote signals all remote commands have a RT_ prefix The only further note on the telemetry outputs conce...

Страница 10: ... collector output that comes directly from the NPN transistor outputs of the opto isolator devices The available output sink current is dependent on the opto isolator transfer ratio Generally one can expect at least 20mA of sinking current for each output listed here Because these are open collector they can be connected to maximum 30 VDC output The active true condition whether high or low will d...

Страница 11: ...nsure that it is shorted out i e closed so that the transmitter is enabled to be turned ON The external1 interlock contacts are available in two separate locations The first location is on the two pin terminal block on the rear of the transmitter chassis This is the more likely and convenient place for the External1 interlock to be connected A second parallel set of contacts is located on the 15 p...

Страница 12: ...oint is provided below the RF out on the front panel Its coupling is approximately 24dB and it is not calibrated for exact measurements 2 Interlocks Interlocks are employed by the amplifier to avoid damage to the equipment and to the output section For instance an internal interlock for over temperature exists to shut down the Transmitter if the temperature of the amplifier heatsink exceeds a cert...

Страница 13: ... the transmitter has been ON for approximately 15 minutes should you perform fine adjustments The amplifier must be allowed to reach its operating temperature for stable and consistent operation The Power Amplifier in the transmitter is equipped with thermal compensation circuits which reduce the output power when the temperature rises Therefore the operating temperature must be reached before adj...

Страница 14: ...of 300 20mA Check that the junction of R100 and CR100 measures between 3 5 and 5 5 volts Adjust RV110 to raise total current draw to 1 0A 50mA Check that the junction of R110 and CR110 measures between 3 5 and 5 5 volts Increase the power supply current limiting to 2 2A Increase RV3 clockwise slowly and check that the maximum current limits itself at 1 6 0 1 Amp but do not allow current to go abov...

Страница 15: ... conclusion about what is at fault The following describes some fault conditions and possible solutions Amplifier Completely OFF The amplifier is equipped with a fused AC line filter Although it rarely happens abnormal conditions such as power surges may cause the fuse to blow Blown AC fuses will completely shutdown the amplifier In this case replacing the fuse will rectify the problem No RF Outpu...

Страница 16: ... frequent checks on the equipment and thereby increase his her familiarity with its operation The transmitter log entries made during these checks would include all meter readings also any irregularity in performance or in picture quality for later analysis An unattended site where equipment is operated by remote control and monitored by telemetry and a high quality off air receiver or demodulator...

Страница 17: ...MXD5U OPERATIONS AND MAINTENANCE 6 TEST EQUIPMENT SETUP Figure 8 Test Equipment Setup PUB09 03 Rev 0 April 16 2009 09 03 14 MXD5U Operations and Maintenance ...

Страница 18: ...AL Ambient Temperature 0 C to 45 C 0 F to 113 F Humidity 95 Altitude 3500m COOLING 1 muffin fan pulls air through the front panel and heatsink and out through the rear panel DIMENSIONS The Amplifier and Modulator chassis are standard 19 rack wide units Height Amplifier 3 5 2RU Modulator 1 75 1RU Total Height 5 25 3RU SHIPPING WEIGHT Weight Approximately 6 5kg 14lbs PUB09 03 Rev 0 April 16 2009 09 ...

Страница 19: ...MXD5U OPERATIONS AND MAINTENANCE Figure 9 Front End Amplifier MXD5U PUB09 03 Rev 0 April 16 2009 09 03 16 MXD5U Operations and Maintenance ...

Страница 20: ...MXD5U OPERATIONS AND MAINTENANCE Figure 10 IPA Assembly MXD5U PUB09 03 Rev 0 April 16 2009 09 03 17 MXD5U Operations and Maintenance ...

Страница 21: ...MXD5U OPERATIONS AND MAINTENANCE PUB09 03 Rev 0 April 16 2009 09 03 18 MXD5U Operations and Maintenance Figure 11 Amplifier Pallet MXD5U ...

Страница 22: ...MXD5U OPERATIONS AND MAINTENANCE PUB09 03 Rev 0 16 April 2009 09 13 19 MXD5U Operations and Maintenance Figure 12 MXD5U Control Board Assembly ...

Страница 23: ...MXD5U OPERATIONS AND MAINTENANCE NOTES PUB09 03 Rev 0 16 April 2009 MXD5U Operations and Maintenance ...

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