TPL Communications 3-2BH-AIR RF Power Amplifier User Manual Manual

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Document ID	660916
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Document Description	Users Manual 2
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Permanent Confidential	No
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Document Type	User Manual
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Filesize	269.04kB (3363026 bits)
Date Submitted	2006-05-22 00:00:00
Date Available	2006-05-18 00:00:00
Creation Date	2006-04-10 17:47:18
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2006-04-10 10:57:56
Document Title	Manual.pdf
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Document Author:	choque

RF Amplifier Maintenance
The HMS amplifier assembly consists mainly of a power amplifier subassembly and a power supply. as
shown on the block diagram 102152. In most cases. field maintenance of the HMS amplifiers should not
be attempted. However, if disassembly for repair is required, major components of the amplifier assem—
blies can be easily 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 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 ampli-
tier.
4. Remove 2 screws, connecting the amplifier heat sink to the rear panelt 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 removed 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
two on the bottom.
3. Carefully disconnect the cables from the interconnect board.
4. Remove the rear pannel.
5. Disconnect the two Molex connectors 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 connects the power supply.
8. Remove the power supply through the rear of the HMS unit.
Page 7
METERING AND TEST POINTS ON
CONTROLLER ASSEMBLY
The following signals and voltages are indicated on the front panel meter, a liquid crystal display. The
voltage to be monitored is selectable via 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
AMP STATUS ................... Meter default position
FWD PWR .................... Output RF Forward Power Level
RFL PWR ...................... Output RF Reverse (Reflected) Power Level
PTT STATUS ................... ON/OFF indication of PTT control signal
A VOLTS ...................... DC Voltage of the “A" Amplifier Assembly
B VOLTS ...................... DC Voltage of the “B" Amplifier Assembly
A CURR ....................... DC Amperes of “A” Amplifier
B CURR ....................... DC Amperes of “B" Amplifier
TOT CURR .................... Total DC Amperes
The switch can be toggled in either direction. If the switch is not toggled for approximately three minutes
the display reverts to the AMP STATUS position.
The primary purpose for the front panel switch is to provide a tool for maintenance of the RF amplifier
system. A table for recording values for each parameter shown by the panel meter is included as appen-
dix I of this manual. It is strongly recomended that these parameters be entered in the table upon initial
installation of the RF amplifier and at regularly scheduled intervals after that. In case of a system failure,
values can be recorded in the table and the table faxed to TPL Communications. This will greatly aid our
technical personnel to make any necessary repairs to the system.
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.
Page 8
Metering and Test Points
(Cont)
INDICATOR FUNCTION/CHARACTERISTIC
DC ON Lamp AAAAAAAAAAAAAAAAA Steady green light indicating that DC is being supplied to the unit.
SWR Lamp ................... 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 a fan is not operating.
REMOTE MONITORING
The monitor and control functions are described in other sections. These are functions, some of which
are displayed by LED's on the front panel, are available in the MONITOR connector on the rear panel.
The outputs are as shown on the following chart:
Page 9
Monitor Signals
High Power VHF/AM Amplifier
m-
Open Collector, Series .
LOW Power 100 Ohms
Standing Wave Open Collector, Series .
7 100 Ohms Aetlve Low
ijoptfrégrziector, Senes
VCS n- Source R = 5K
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Amp. OFF Command Input
n-wrsssfsw =
PRS Source R = 10K
Page 10
15V Maxr
15V Max.
5V = 750W
5V = 750W
OPERATOR ADJUSTMENT
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 of the Control Unit. These are potenti—
ometer VR3 through VR7. Their functions are as follows:
REF. DESIG. FUNCTION/ADJUSTMENT
VR3 .......................... SWR threshold set to determine the alarm level for the front panel i
indicator.
VR4 .......................... Determines the threshold for a valid PTT sensing level.
VR5 .......................... Low RF power output threshold adjustment to set the alarm level
for the front panel indicator.
VR6 .......................... Meter calibration potentiometer for the RF power output.
VR7 .......................... Meter calibration potentiometer for the RF reflected power.
A basic understanding of RF priciples 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 the factory about changes,
RF Adjustments
The necessary adjustment procedure to change amplifier settings is as follows:
Provide a proper low SWR RF termination for the amplifier. Monitor the output with a
calibrated RF power meter. As a reference. set the adjustment to produce nominal RF
output.
VR4 For AM operation, this potentiometer sets the level at which the input PTT signal is
detected. With a 5 Volt signal, it is normally set to maximum
VR5 Lower the RF input drive (from its nominal level) until the RF output drops to its lowest
acceptable value. Adjust VR5 until the front panel lamp begins to flash. Restore normal
drive power. The lamp should then extinguish.
Page 11
OPERATOR ADJUSTM ENTS
(Cont.)
RF Adjustments
VRG 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 cabrated
power meter. Set the input drive level to provide nominal power output. Adjust VRS so that
the front panel meter is in agreement with the calibrated power meter.
VR7 Toggle the front panel switch until the top line of the display reads FWD PWR. Attach a
2:1 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 VR7 so that the front panel
meter reads the reflected power. This should be approximately 11% of the forward power
level noted above.
VR3
The optimum setting for this SWR threshold adjusment is to have the alarm trigger with a
2:1 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.
Page 12
WARRANTY
TPL COMMUNICATIONS has tested and found this unit to function properly and to operate within
the parameters of its stated specifications
TPL COMMUNICATIONS warrants that this product is free from defects in material and work—
manship. If found to be defective within two (2) years from the date of purchase. TPL, at its discre—
tion, will repair or replace the unit at no cost provided the unit is delivered to the factory intact
Warranty does not apply to any product which has been subjected to misuse, neglect, accident,
improper installation, or used in violation of the instructions furnished by TPL, nor does it extend to
unit which have been repaired or altered outside of our service department, norwhere the serial
number has been removed, defaced. or changed
SERVICE
For service on this amplifier, contact:
TPL COMMUNICATIONS
Customer service department
Phone: (323) 256—3000 (800) HI - POWER
FAX: (323) 254-3210
EMAIL: sales@tplcom.com
For information on other
TPL products visit ourwebsite at:
www.tplcom.com
Page 13

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