1. Manuals
  2. Brands
  3. Pulsar Manuals
  4. Amplifier
  5. LPA50
  6. System manual

Pulsar LPA50 System Manual

50/100w linear power amplifier
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
LPA50/LPA100
50/100W LINEAR POWER AMPLIFIER
System Manual
CA44–VER03
(Replaces CA44-VER02)
4050 NW 121st Avenue
Coral Springs, FL 33065
1–800–785–7274
Technologies, Inc.
www.pulsartech.com
Printed
June 2001

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LPA50 and is the answer not in the manual?

Questions and answers

Related Manuals for Pulsar LPA50

Summary of Contents for Pulsar LPA50

  • Page 1 LPA50/LPA100 50/100W LINEAR POWER AMPLIFIER System Manual CA44–VER03 (Replaces CA44-VER02) 4050 NW 121st Avenue Coral Springs, FL 33065 1–800–785–7274 Technologies, Inc. www.pulsartech.com Printed June 2001...
  • Page 2 Copyright © 2001 Pulsar Technologies, Inc.
  • Page 3 M M a a i i n n t t e e n n a a n n c c e e LPA50/ P P o o w w e e r r S S u u p p p p l l y y M M o o d d u u l l e e LPA100 1 1 2 2 .
  • Page 4 LPA50/LPA100. Note also that in some cases text and graphics may have flowed to a different page than in the previous publi- cation due to formatting or other changes.
  • Page 5 LPA50 or LPA100. Failure to do so may result in injury to personnel or damage to the equipment, and may affect the equipment warranty. If you mount the LPA chassis in a cabinet, it must be bolted to the floor or otherwise secured before you swing out the equipment, to prevent the installation from tipping over.
  • Page 6 Technologies, Inc. Preface Scope This manual describes the functions and features of the LPA50 and LPA100 linear power amplifiers. It is intended primarily for use by engineers and technicians involved in the installation, alignment, operation, and maintenance of the LPA50/LPA100.
  • Page 7 Contents of LPA50 and LPA100 The LPA50 and LPA100 include the modules and parts listed below. The style number and latest revision level for each module and part is shown, as is the the quantity included with each set. (For ordering infor- mation, please see Table 2-1 in Chapter 2.)
  • Page 8 TC-10B (Analog Receiver) or TCF-10B RF connections ....2-1 LPA50/LPA100 chassis dimensions ........3-3 LPA50/LPA100 chassis footprint dimensions .

  • Page 9: Table Of Contents

    LPA50 Technical Specifications ........1-5...
  • Page 10 Technologies, Inc.

  • Page 11: General Description

    Height – 5.25” (133.35 mm), requiring 3 rack units, each measuring 1.75” (44.45 mm) Width – 19.00” (482.6 mm) Depth – 13.50” (342.9 mm) This is the same size chassis used for PULSAR’s TC-10B/TCF-10B carrier sets. Each chassis is notched for mounting in a standard relay rack. Copyright © 2001 Pulsar Technologies, Inc.
  • Page 13 • 50W Combiner Module (1) The modular layout for the LPA50 chassis is shown in Figure 1-1. At each end of the chassis is a Power Supply Module and two 12.5W Power Amplifier Modules. Each Power Supply Module powers the two 12.5W Power Amplifier Modules closest to it.
  • Page 14 50W Power Combiner Module and a 100W Power Combiner Module. The second LPA100 chassis (2 of 2) is just like the LPA50 chassis. It has a Power Supply Module and two 12.5W Power Amplifier Modules at each end and a 50W Combiner Module in the center.

  • Page 15: Lpa50 Technical Specifications

    Chapter 1 Product Description Specifications The LPA50 and LPA100 meet or exceed all applicable ANSI/IEEE standards. Table 1-1 shows the technical specifications for the LPA50. The technical specifications for the LPA100 are shown in Table 1-2. Table 1–1. LPA50 Technical Specifications.

  • Page 16: Lpa100 Technical Specifications

    50W / 100W Linear Power Amplifier System Manual Technologies, Inc. Table 1–2. LPA100 Technical Specifications. Frequency Bandwidth 30 kHz–535 kHz Input impedance 25Ω with all eight 12.5W Power Amplifiers plugged in Output impedance 50Ω with all eight 12.5W Power Amplifiers plugged in Maximum power input 10 W (+40 dBm, 50Ω...

  • Page 17: Environmental Requirements Specifications

    Chapter 1 Product Description 1.10 Environmental Requirements This section provides three tables depicting the LPA50/LPA100 environmental requirement specifications, broken down as follows: • Environmental Requirements (Table 1-3) • Altitude Dielectric Strength De-Rating for Air Insulation (Table 1-4) • Altitude Correction For Maximum Temperature Of Cooling Air (ANS C93.5) (Table 1-5) Table 1–3.

  • Page 18: Altitude Dielectric Strength De-Rating For Air Insulation

    50W / 100W Linear Power Amplifier System Manual Technologies, Inc. Table 1–4. Altitude Dielectric Strength De-Rating for Air Insulation Altitude (Meters) Correction Factor 1,500 1.00 1,800 0.97 2,100 0.94 2,400 0.91 2,700 0.87 3,000 0.83 3,600 0.79 4,200 0.74 4,800 0.69 5,400 0.64...
  • Page 19 Chapter 1 Product Description June 2001 Page 1–9...
  • Page 20 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. Page 1–10 June 2001...
  • Page 21 Chapter 1 Product Description June 2001 Page 1–11...
  • Page 22 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. USER NOTES Technologies, Inc. Page 1–12 June 2001...

  • Page 23: Tc-10B With Lpa Rf Connections

    Chapter 2. Applications and Ordering Information LPA50/LPA100 Applications The LPA50 and LPA100 are used in applications 2.1.1 Directional Comparison Blocking where the losses between the transmitting and systems receiving carrier sets are greater than a 10 W For Directional Comparison Blocking systems, system can handle.

  • Page 24: Lpa50/Lpa100 Catalog Numbers

    See Figure 2-2. Having two separate alone LPA50 or one of the two chassis for an modules, one for the receiver and one for the LPA100. It also identifies the type of DC power detector/CLI will identify the analog receiver.

  • Page 25: Lpa50/Lpa100 Module And Chassis Style Numbers

    LPA50/LPA100 style numbers is and chassis component has its own style number. provided in Table 2-2. You can use this style number to order individual Table 2–2. LPA50/LPA100 Module and Chassis Style Numbers. Quantity per Part Type Module / Item Description...
  • Page 26 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. USER NOTES Technologies, Inc. Page 2–4 June 2001...
  • Page 27 “T” left front. The label tells you whether the chassis connector (see “Rear Panel Connections” later in is a standalone LPA50 or one of the two chassis this chapter). for an LPA100. If it is one of the LPA100 chassis, the label tells you whether it is chassis 1 (of 2) or chassis 2 (of 2).
  • Page 28 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. You can mount your LPA50/LPA100 in any of the 3.1.3 Rear Panel Connections following configurations: The LPA50 rear panel connections are shown in Figure 3-3. The LPA100 rear panel connections •...

  • Page 33: Extender Board

    Chapter 4. Test Equipment TEST EQUIPMENT The same type of test equipment used to test carrier sets is also used to test and adjust the LPA50 and LPA100. The following test equipment is recommended: Table 4–1. LPA50/LPA100 Recommended Test Equipment.
  • Page 34 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. Page 4–2 June 2001...
  • Page 35 Power Amplifier Following are step-by-step procedures to properly module to minimum (fully counterclock- power up and do initial adjustment on the LPA50 wise). This will prevent it from overdriving and LPA100. These procedures are only intended the LPA when initially powered up.
  • Page 36 INPUT LEVEL pot on the 8. This concludes the adjustment of the driving carrier set’s Power Amplifier LPA50. module. This level should never exceed 1Vrms (+13.0 dBm, 50Ω reference) in 5.1.2 LPA100 Adjustment Procedure order to prevent overdriving the LPA.
  • Page 37 INPUT test point of one of the 12.5W Following are step-by-step procedures to calibrate Power Amplifiers to make sure it doesn’t and troubleshoot the LPA50 and LPA100. These exceed 1Vrms as set in step 4. It is recom- steps should be followed if there are any problems...
  • Page 38 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. module. If the OUTPUT LED is not lit with one another, their output levels there may be a bad 12.5W Power should be checked on the input test Amplifier that is dragging down the points of the 50W Power Combiner output of the Power Supply module so module.
  • Page 39 13 watts. Amplifiers in each of the two chassis, 8. This concludes the calibration of the measure between the INPUT and LPA50. COMMON front panel test points. Since all four of these amplifiers’ inputs are 5.2.2 LPA100 Calibration Procedure tied together in each chassis and the two 1.
  • Page 40 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. one another and approximately 27.2Vrms output generated internally in the chassis, (+41.7 dBm, 50Ω reference). If not then the & white = 50W output of external chassis) serial # sticker must be removed from the and the input common test jack (black).
  • Page 44 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. USER NOTES Technologies, Inc. Page 5–10 June 2001...
  • Page 45 6.3 Periodic Checks 2) Use multi-meters with at least 20,000Ω- Every six months, take the following readings on per-volt sensitivity. the LPA50/LPA100 Test Jacks (at the control panel). 6.2 Precautions When Using We recommend that you keep a log book as a...
  • Page 46 INFORMATION THESE INSTRUCTIONS • be removed and washed out) BEFORE ENERGIZING THE LPA50/LPA100 AND ASSOCIATED ASSEMBLIES. • Dust which may cause short circuits FAILURE TO OBSERVE THIS PRECAUTION MAY RESULT IN DAMAGE TO THE EQUIPMENT. YOU SHOULD NEITHER REMOVE NOR INSERT PRINTED CIRCUIT MODULES WHILE THE LPA50/LPA100 IS ENERGIZED.
  • Page 47 Chapter 6 Maintenance 4. Further isolation of faults includes: 3. When replacing the transistor, diode, or other device, make certain that the device and the • Voltage readings heat sink make secure contact for good heat • Resistance readings dissipation. Mount a device first on the heat sink, and then on the board.
  • Page 48 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. USER NOTES Technologies, Inc. Page 6–4 June 2001...

  • Page 49: Power Supply Module

    Table 7–1. 1617C38 Styles and Descriptions. 7.1 Power Supply Module Description Group Description The Power Supply Module for the LPA50/LPA100 48 V WITH ALARM RELAY has dual dc/dc high-frequency switching regula- tors which generate regulated voltage outputs of 125 V WITH ALARM RELAY ±20 Vdc (between 1.5 and 2.0 Amps) for...

  • Page 51: Power Supply

    Chapter 7 Power Supply Module the TC–10B/TCF–10B. The converter outputs, 7.2 Power Supply Circuit +20 Vdc and -20 Vdc, is fed to the output filter. Description (See Figure 7-3.) The module comprises the following circuits: Output Filter • Fuses The output filter for the +20 V consists of C4, C6, •...
  • Page 53 (The 12.5W PA PC Board is shown in Figure 8-2.) Operator controls consist of a Jumper (JU1) for the Alarm Relay (NO/NC), which indicates loss of power condition (less than 1 W). Figure 8–1. 12.5W PA 1606C33 Front panel. Copyright © 2001 Pulsar Technologies, Inc.
  • Page 54 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. The alarm circuit (loss of RF signal condition) 12.5W PA Circuit consists of QN3, Q8, K1 and associated compo- Description nents. The RF signal is monitored by C22, at T1 The function of the 12.5W PA Module (see Figure pin 1.
  • Page 57 Combiner module balance resistors will heat up. This is normal since only part of the Power Amplifier modules would be energized causing imbalance in the Power Combiner module. This heating will disappear after all Power Supplies are turned on and all the Power Amplifier modules are energized. Copyright © 2001 Pulsar Technologies, Inc.
  • Page 58 50W / 100W Linear Power Amplifier Technologies, Inc. 9.2 50W Combiner Modules Test Points NOTE To maximize the efficiency of your TC- 9.2.1 Preliminary checks 10B/TCF-10B system it is important to verify In order to check that all 4 of the 12.5W Power the equalization of the power amplifiers via Amplifiers are balanced with one another, their the 50W combiner modules’...
  • Page 61 Amplifier modules would be energized causing imbalance in the Power Combiner module. This heating will disappear after all Power Supplies are INJECT/EJECT turned on and all the Power Amplifier modules are LEVER energized. Figure 10–1. 50W Combiner Module Copyright © 2001 Pulsar Technologies, Inc.
  • Page 62 50W / 100W Linear Power Amplifier System Manual Technologies, Inc. and the common test point (black) for both chassis NOTE in order to verify that all eight levels are equal to To maximize the efficiency of your TC- one another and approximately 27.2Vrms (+41.7 10B/TCF-10B system it is important to verify dBm, 50Ω...
  • Page 64 Technologies, Inc.
  • Page 66 Technologies, Inc.

This manual is also suitable for:

Lpa100

Table of Contents