TPL Communications 6-2EF-H User Manual 8
TPL Communications Inc 8
8
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| Document ID | 14366 |
| Application ID | TouIgYSJTyoaXHRlR29YMA== |
| Document Description | 8 |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 17.25kB (215676 bits) |
| Date Submitted | 1998-11-30 00:00:00 |
| Date Available | 1998-09-24 00:00:00 |
| Creation Date | 2001-07-11 13:45:43 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-07-11 13:45:44 |
| Document Title | 8 |
09 March 1998 FCC ID: BBD6-2EF—H APPENDIX B OPERATING/SERVICE/DISTRUCTION MANUAL B1 SERVICE MANUAL HMS SERIES UHF RF POWER AMPLIFIERS TPLCOMMUNICATIONS 3370 SAN FENANDO RD. #206 LOS ANGELES, CA 90065 VOICE 213-256-3000 FAX 213-254-3210 REV:010297 TABLE OF CONTENTS PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . GENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . OPERATING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . QulthN MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . METERING AND TEST POINTS . . . . . . . . . . . . . . . . . . OPERATOR ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . 10 REMOTE MONITORING . . . . . . . . . . . . . . . . . . . . . 13 CIRCUIT DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . 14 TUNE UP INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . 18 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . 21 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . 38 GENERAL SPECIFICATIONS: FREQUENCY RANGE: 400 - 512 MHZ. OPERATING MODE : FM NOMINAL POWER POWER MODEL INPUT OUTPUT PAfi—ZEF-HMS BO-ZOOmW 300W PAG—ZBF—HMS 5—12W 300W PAG—ZGF—HMS 20-45W 300W OPERATING TEMPERATURE RANGE: —20° to +50“ Celsius. OPERATING VOLTAGE: 110 VAC Standard, 220 VAC Optional. BIA DUTY CYCLE: 100% RECEIVER INSERTION L055: 1 dB maximum, when optional receive relay is specified. HARMONIC ATTENUATION: Meets FCC Type Acceptance requirements. FUSING: 15 Amperes for 110 Volt operation, 7.5 Amperes for 220 Volt operation. OPTIONS: TPL HMS power amplifiers are available in several options and configurations, when specified at the time of order. Repeater Configuration (standard): Supplied without a carrier operated relay (COR). Base Station Configuration: Supplied with a COR. INSTALLATION: This unit is designed for mounting in a standard 19” rack. When picking a location in the rack, consideration must be given to RF power output cable lengths, as well as cooling considerations . Mount the unit where dust and other debris are not likely to clog the cooling fins. Avoid mounting the amplifier directly above not pieces of equipment that could artificially raise the amplifier temperature. Connect the radio transmitter to the "RF INPUT" terminal and the antenna to the "RF OUTPUT" terminal on the amplifier, with 50 Ohm coaxial cable and TYPE N plugs. TYPE N plug assembly is shown on the following pages. Plug the AC line card into the system AC power receptacle. For safety, make sure the rack and all equipment connecting to the amplifier have proper AC grounds. Do not rely on coaxial cable shields for AC grounding. Assure the installation has proper lightning protection. MAINTENANCE Major components of the HMS amplifiers can be easilly removed and replaced. Removal of the RF Amplifier. The RF amplifier assembly can he removed using the following steps: 1. Disconnect the cables from the RF input and RF output terminals on the rear of the amplifier. 2. Disconnect the power and signal connector on the right side of the amplifier. 3. Remove 6 screws, connecting the amplifier heat sink to the chassis. See the top view of the amplifier. 4. Remove 2 screws, connecting the amplifier heat sink to the rear panel. See the rear view of the amplifier. 5. Remove the RF amplifier from the top. Removal of the Power Supply. The power supply can be used using the following steps: 1. Make sure that AC power is disconnected from the HMS unit. 2. Remove the screws holding the rear panel. There are two screws on each side, two on the top, and one on the bottom. 3, Carefully disconnect the cables from the interconnect board. 4. Remove the rear panel. 5. Disconnect the two molex connectectors from the power supply. 6. Disconnect the AC and DC power cables to the supply. 7. Remove the 4 screws on the bottom of the HMS unit that connect the power supply. 8. Remove the power supply through the rear of the HMS unit. METERING AND TEST P0|NTS The following signals and voltages are indicated on the front panel meter, a liquid crystal display. The voltage to be monitored is selectable via the front panel momentary contact toggle switch. The display has two lines ot text. The tip line indicates the parameter to be measured while the bottom line indicates the measured value and its units. Refer to the front panel drawing in the illustrations section tor the location olthe meterand switch. The lollowing is alistoldisplay positions and functions: Display Position Function HMS STATUS ........... Meterdeiault position FWD PWR .............. Output RF Forward Power Level RFL PWR ............... Output FlF Reverse (Reflected) Power Level RF INPUT ............... Input RF Power Level (Relative Heading Only) DFthEFt v .............. DC Volhge Driver Amplifier FINAL V ................ DC Voltage, Final Amplifier A CUHR ................ Amplifier "A“ DC Amperes B CURR ................ Amplifier "B" DC Amperes TOT CURFl .............. Tohl DC Amperes The switch can be toggled in either direction. lt the switch is not toggled («approximately three minutes the display reverts to the HMS STATUS position. The primary purpose tor the tront panel switch is to provide a tool tor maintenance of the RF amplifier system. A table for recording values tor each parameter shown by the panel meter is included as appendix l oi this manual. It is strongly recommended that these parameters be entered in the table upon initial installation at the RF amplifier and at regularly scheduled intervals after that lncaseofa system talure, valuescan berecorded inthetabteandthetable taxed to TPL Communications. This will greatly aid our technical personnel to make any necessary repairs to the system. In addition to the tram panel «metering, system monitoring is provided by tront panel indicators. Five indicators are used and have the lollowing lunctions and characteristics. Indicator RF ON Lamp sz Lamp OTEMP Lamp LOPWR Lamp FANS Lamp Function/Characteristic . Steady green light indicating that RF is being supplied to the amplifier Flashing red alarm when output load VSWR is too high Flashing red alarm when amplifier chassis is too warm Flashing red alarm when RF output power is too low Flashing red alarm when fans are not operating. REMOTE MONITORING The monitored functions are described in other sections. These same functions, panel, are available in the REMOTE MONITOR connector on the rear panel. The outputs are as follows: some of which are displayed by LED's on the front OPERATOR ADJUSTMENTS A display contrast adjustment is provided on the front panel, between the LCD display and the meter select switch. This is a ten turn pot. Other operator adjustments are accessible through the rear panel. These are potentiometer P1 through P8 and switch sw1. Their functions are as follows. Ref. Desig Function/Adjustment P1 . . , . . . . . RF output power level adjustment. This is a 10 turn potentiometer F2 . t . . . . . 4 Zero adjustment for side "B" power amplifier current calibration. P3 . . . . . 4 . . SWR threshold set to determine the alarm level for the front panel indicator P4 . . . . . . . . Determines the threshold for a valid input RF power level P5 . . . . . . . . Low RF power output threshold set to determine the alarm level for the front panel indicator. P6 . . . . . . . . Meter calibration potentiometer for RF power output. P8 . . . . . . . . Zero adjustment for side "A" power amplifier current calibration, sw1 . . . . . . . . Determines the method of RF output power control. The up position provides regulated DC control. The down position provides RF feedback leveling control. A basic understanding of RF principles is necessary before making any adjustments to the unit. This includes knowledge of the relationship of forward and reflected power relative to SWR etc. Adjustment also requires the familiarity and use of test equipment. If in doubt consult your dealer or the factory about changes. 11 P6 P7 P3 Toggle the front panel switch until the top line of the display reads FWD PWR. with the proper RF termination still in place, monitor the RF forward power output on a calibrated power meter. Set P1 to provide nominal power output. Adjust P6 so that the front panel meter is in agreement with the calibrated power meter. Note this power reading. Note: the recommended output power range is from the specified maximum output level to one half that value. Consult the factory if a lower power level is required. In all cases, a spectrum analyzer should be used to assure that no spurious signals are generated when the power level is changed. Toggle the front panel switch until the top line of the display reads FWD PWR. Attach a 3:1 SWR load to the output and note the forward power. Toggle the front panel switch until the top line of the display reads RFL PWR and adjust P7 so that the front panel meter reads the reflected power. This should be set to read 1/4 the forward power level noted above. The optimum setting for this SWR threshold adjustment is to have the alarm trigger with a 3:1 SWR. It may however be set anywhere at the users discretion. with the 3:1 SWR used in the previous step still terminating the amplifier, apply normal RF drive and adjust the potentiometer until the front panel SWR lamp begins to flash. The lamp should extinguish when the SNR is reduced or the normal load is connected. 13 RF Amplifier PAG—ZGF-HMS The model PAG-GZF—HMS RF amplifier consists of an input attenuator, RF driver, four final stages, low pass filter, dual directional coupler, RF detector, RF signal splitter, RF signal combiner, and a thermistor. It amplifies a 400 to 512 MHz RF input to produce a 300W RF output. The driver has a gain of approximately 10 dB, and the combined gain of the final stages along with the filter and coupler is approximately 8 dB. DC Power to the driver stage is controlled by a darlington transistor. This transistor allows power to be reduced by high temperature, high VSWR conditions, or the control potentiometer, P1. A detector is present on the RF input. This detector provides a measure of the amplitude of the RF input to the control board. A two way power splitter divides the input signal evenly between the driver and the detector. A dual directional coupler on the output provides outputs to the control board which indicate the amplitude of forward and reflected RF output power. A thermistor measures the operating temperature on the heatsink 15 FAN DETECTOR(Ql1,QlZ) The fan, when rotating, outputs a square wave at approximately 1Khz. The negative half of the square wave is rectified and filtered, keeping the appropriate transistor off. Loss of the square wave causes the negative bias to be lost causing the respective transtor Q11, or 012 to be turned on. Either transistor turned on activates the FANS LED alarm. Digital Panel Meter Board. (101921) The digital panel meter board accepts test signals from the control board, multiplexes these signals to an analog to digital converter, and formats and outputs the signals to a liquid crystal display (LCD). The major components of the panel meter board are: input filters, voltage regulator, analog to digital converter, and controller. On the rear of the board there is a 14 pin header and a potentiometer. The header connects directly with the LCD display unit on the front panel. The potentiometer is accessible by a hole in the front panel This potentiometer controls the contrast of the display. VOLTAGE REGULATOR U1. This is a precision voltage reference. It provides the reference to the analog to digital converter and SVDC to the other circuits on the board. ANALOG T0 DIGITAL CONVERTER (ADC) U2. This circuit is a twelve bit analog to digital converter and multiplexer. The input multiplexer, controlled by the HCOS controller selects the analog input to be tested. The ADC converts the analog input to a 12 bit digital word. This digital word is output to the controller in serial format. MICRO-CONTROLLER U3. The micro controller selects the input data, controls the ADC and outs the digital data to the front panel display unit. A two position header, JP1, allows the panel meter to be used for either HMS or LMS series amplifiers. A shunt across 391 causes the LMS series to be selectedr Otherwise the HMS series is selected. 17 TUNING ADJUSTMENT PROCEDURE FOR MODEL PAG—ZEF,PA6—ZBF,PA6—2GF STEP ADJUST —l FUNCTION—l INSTRUCTIONS Set up amplifier in accordance with test set—up diagram. minimum specified RF power at the desired frequency. Set SWl on the rear panel to the up (DC Feedback) position, and set Pl for maximum VD on test meter‘ Output IAdjust for maximum power out. Tuning C11 Driver Boards 3. ClDriver Input Adjust for maximum power out. Boards Tuning _4 4. C11 Final Output [Adjust for maximum power out. 1 Boards Tuning 5. Cl Final Input Adjust for maximum power out. Boards Tuning 6. Overall Adjust input drive to actual tuning operating power and repeat all steps for optimum performance. 7. Set Swl on the rear panel to the down RF feedback position. Set power output as described in the _4 section: Operator Ajustments. 19
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