TPL Communications 8-2EG-H User Manual 8

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Document TypeUser Manual
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Date Submitted1998-11-30 00:00:00
Date Available1998-09-24 00:00:00
Creation Date2001-07-11 13:57:18
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Document Title8

09 March 1998
FCC 1D: BBDS-ZEG-H
APPENDIX B
OPERATING/SERVICE/INSTRUCTION MANUAL
El
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 . . . . . . . . . . . . . .
MAINTENANCE . . . . . . . . . . .
METERING AND TEST POINTS . . . . . . . .
OPERATOR ADJUSTMENTS . . . . . . . . . .
REMOTE MONITORING . . . . . . . . . . .
CIRCUIT DESCRIPTIONS . . . . . . . . . .
TUNE UP INSTRUCTIONS . . . . . . . .
PARTS LIST . . . . . . . . . . . . . . .
WARRANTY . . . . . . . . . . . . . . .
PRODUCT DESCRIPTION
The HMS series of TPL power amplifiers are intended for use in base
station or repeater applications. They are all high power units
and in various configurations will cover the frequency range
extending from Low Band VHF to 960 MHz.
An HMS amplifier is a self contained unit which allows operation,
metering, and monitoring of an RF power amplifier. It's major
components are: enclosure, front panel, rear panel, power
amplifier, power supply, cooling fans, and metering and monitoring
circuits. The entire assembly is designed to be installed in a
nineteen inch rack.
For operator convenience views of the top, front, and rear of the
amplifier are presented in the illustrations section.
GENERAL SPECIFICATIONS:
FREQUENCY RANGE: 400 - 512 MHz.
OPERATING MODE . FM
NOMINAL
POWER POWER
MODEL INPUT OUTPUT
PAfi—ZEF-HMS 80-200mw 300W
PAG-ZBF-HMS 5-12W 300W
PA6-2GF—HMS 20-45W 300W
OPERATING TEMPERATURE RANGE: -20° cc +50“ Celsius.
OPERATING VOLTAGE: 110 VAC Standard, 220 VAC Optional.
BIA DUTY CYCLE: 100%
RECEIVER INSERTION Loss: 1 dB maximum, when optional receive relay
is specified.
HARMONIC ATTEHUATION: 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.
NOTE:
This amplifier has been factory-tuned to the frequency
specified at the time of order and will operate within tSMHz of
that frequency. For operation at any other frequency, see the Tune
Up Instructions section.
CAUTION!
Check the amplifier upon receipt for visible damage. If any is
noticed, please call TFL at 800 HI POWER to request a RMA number
(Return Material Authorization). If purchased through a dealer, ask
them to follow this procedure for best results.
EXPENSIVE COMPONENTS MAY BE DESTROYED IF THE AMPLIFIER IS TURNED ON
IN A DAMAGED CONDITION.
OPERATING PRECAUTIONS
CAUTION: This amplifier produces RF voltages that can cause painful
and dangerous RF burns. Use caution! Connect and disconnect all RF
connections with the DC power and drive power off.
DRIVE POWER: RF power transistors, although quite rugged in most
respects, are easily damaged by overdrive. Be careful not to
overdrive this amplifier, even for an instant. Higher than rated
drive power may destroy the transistors and VOID ANY WARRANTY.
TERMINATIONS:The efficiency of this amplifier will degrade if it is
operated into anything but a 50 ohm load. Lowered efficiency may
mean any, or all, of the following; lower power output, increased
current drain, higher operating temperature, and reduced life.
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 hot
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 cord 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.
FIGURE 1
MAINTENANCE
Major components of the HMS amplifiers can be easilly removed and
replaced.
Removal of the RF Amplifier.
The RF amplifier assembly can be 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 ccnnectectors 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.
“1
«M.
functions:
Disglax Position Function
HMS STATUS ........... Meter default position
FWD PWR .............. Output RF Forward Power Level
RFL PWR ............... Output RF Reverse (Reflected) Power Level
RF INPUT .............. Input RF Power Level (Relative Heading Only)
Dan/En v .............. DC Voltage Driver Amplifier
FINAL V ................ DC Voltage, Final Amplifier
A CURR ................ Arnplifier "A“ DC Amperes
B CUFlFt ................ Amplifier "B" DC Amperes
IQ: CURB .............. Total DC Amperes
The switch can be toggled in either direction. It the switch is not toggied lorapproximately three
minutes the display reverts to the HMS STATUS position.
The primary purpose tor the lront panel switch is to provide a tool for maintenance at the BF
amplifier system. A hble tor recording values tor each parameter shown by the panel meter is
included as appendix l or this manual. it is strongly recommended that these parameters be
entered in the table upon initial installation ol the HF amplifier and at regularly scheduled intervals
In addition to the front panel metering, system monitoring is provided by wont panel indicators.
Five indicators are used and have the tollowing lunctions and characteristics.
METERING AND TEST POINTS
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 of text. The top 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 for the location of the meter and switch.
The following is a list of display positions and functions:
Display Position Function
HMS STATUS . . . . Meter default position
FWD PWR . . . . . . Output RF Forward Power Level
RFL PWR . . . . . . Output RF Reverse (Reflected) Power Level
RF INPUT . . . . . Input RF Power Level (Relative Reading Only)
DRIVER V . . . . . DC Voltage Driver Amplifier
FINAL V . . . . . . DC Voltage, Final Amplifier
A CURR . . . . . . Amplifier "A" DC Amperes
B CURR . . . . . . AmplifiEr “8" DC Amperes
TOT CURR . . . . . Total DC Amperes
The switch can be toggled in either direction. If the switch i
not toggled for approximately three minutes the display reverts t
the HHS STATUS position.
In addition to the front panel metering, system monitoring is
provided by front panel indicators. Five indicators are/used and
have the following functions and characteristics. V
Indicator Function/Characteristic
RF ON Lamp . . . . Steady green light indicating that RF is
__ being supplied to the amplifier
SWR Lamp . . . l . Flashing red alarm when output load VSWR is
too high
OTEMP Lamp . . . . Flashing red alarm when amplifier chassis is
too warm
LOPWR Lamp . . . . Flashing red alarm when RF output power is
too low
’; FANS Lamp . . . . . Flashing red alarm when fans are not operating.
w REMOTE MONITORING
The monitored functions are described in other sections. These
‘ same functions, some of which are displayed by LED's on the front
panel, are available in the REMOTE MONITOR connector on the rear
panel. The outputs are as follows:
rm]
_~J
,,.,.j
Indicator Function/Characteristic
RF ON Lamp ............ Steady green light indicating that HP is
being supplied to the amplifier
SWR Lamp .............. Flashing red alarm when output load VSWH is
too high
OTEMP Lamp ........... Flashing red alarm when ampllfier chassis is
000 warm
LOPWH Lamp ........... flashing red alarm when FlF output power is
too low
FANS Lamp ............. Flashing red alarm when fans are not operating,
REMOTE MONITORING
The monitored functions are described in other sections. These same functions, some or which
are displayed by LED's on the front panel, are available In the REMOTE MONITOR connector
on the rear panel, The outputs are as follows:
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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
Pl . . . . . . . . RF output power level adjustment. This is a
10 turn potentiometer
P2 . . . . . . . . Zero adjustment for side "B" power amplifier
current calibration.
P3 . . . . . . . . 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 HF 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
DC Adjustments
Make all DC adjustments with AC power on. Start with RF drive
reduced to 0 (zero) and the RF output terminated.
P2 Toggle the front panel switch until the top line of the
display reads B CURR. Adjust the potentiometer to get an
upscale reading on the front panel meter, then back off
the adjustment until the meter just reads‘O (zero).
P8 Toggle the front panel switch until the top line of the
display reads A CURR. Adjust the potentiometer to get an
upscale reading on the front panel meter, then back off
the adjustment until the meter just reads 0 (zero).
RF Adjustments
The necessary adjustment procedure to change the RF power level is
as follows:
Provide a proper low SWR RF termination for the amplifier.
SWl Set this switch to the up (DC Feedback) position.
P1 This is the basic power adjustment for the unit. It is a 10
turn potentiometer which sets the RF output power level.
Changing its setting may require resetting all other
adjustments. To make this adjustment it is necessary to
monitor the output with a calibrated RF power meter. As a
reference, set the adjustment to produce nominal RF output.
P4 Set the RF input drive to a level 6 dB below the nominal
drive level. Adjust F4 to activate the amplifier and its
fans at this threshold.
P5 Lower the RF input drive (from its nominal level) until the
RF output drops to its lowest acceptable value. Adjust P5
until the front panel lamp begins to flash. Restore normal
drive power. The lamp should then extinguish.
sw1 Return the switch to the down (RF Feedback) position.
12
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 sz 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 SWR is reduced or the normal load is connected.
13
CIRCUIT DESCRIPTIONS
RF Amplifier PAG-ZEF—HMS
The model PAG—ZBF—HMS RF amplifier consists of an RF predriver,
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 pre-driver has approximately 18dB gain, 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. The DC voltage to the pre—driver is approximately 12 VDC and
is derived by resistors R2 and R3, and buffered by darlington
transistor 02.
DC Power to the driver stage is controlled by the 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 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.
RF Amplifier PAG—ZBF—HMS
The model PAG—ZBF—HMS RF amplifier consists of an 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 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.
14
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.
RF output power.
A thermistor measures the operating temperature on the heatsink
15
HMS Control Board 101293
The HMS control board contains: meter buffer circuits, adjustments,
and a power leveling circuit.
CURRENT A CKT. U5A,U5D,UlA. This circuit outputs a ground
referenced voltage which is proportional to the DC current to the
A side of the power amplifier. The DC current to the A side of the
power amplifier flows through a .005 Ohm sense resistor located on
the amplifier heat sink. The source side of the sense resistor is
connected to IR while the load side is connected to IA. when the
amplifier current is zero the collector currents in matched
transistors, U5A and USD are equal. With VRB adjusted properly the
collector voltage of USA is equal to the collector voltage of USDA
collector voltages. It is zero when no current flows in the sense
resistor. DC current to the amplifier creates a voltage drop
across the sense resistor. This causes the collector voltages of
05A and QSD to differ. This difference is amplified by UlA. The
scale factor for this circuit is 0.1 volts = 1.0 amps.
CURRENT B CKT USB,U5C,U1B. This is the same as the current A
circuit. It measures the current to the "B" side of the amplifier.
PWR REFL CKT(U30) This circuit amplifies and buffers the output of
the reverse coupler and drives the meter. It’s sensitivity is
controlled by P7.
SwR BUF CKT(USB) This circuit compares the output of the PWR REFL
CKT to a preset threshold. It drives a warning light, and lowers
the amplifier's output power when the SWR threshold is exceeded.
The sz threshold is adjusted by PB.
INPUT SENSE CKT(U1C) This circuit buffers the detected RF input to
the amplifier. It's output turns on the fans, turns on voltage to
the driver stage, and enables the Low Power alarm light. The input
threshold is adjusted by P4.
PWR MTR CKT
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