Crown Audio FM1000A Stereo Amplifier User Manual
Contents
1. PS1000 Air Exhaust Vents 240 VAC IN Illustration 3 1 PS1000 Back Panel Functions 5 Turn on the exciter a Crown FM30 or equivalent and adjust its RF power output level until the In Reference In Ref voltage as indicated on the PA1000 front panel Digital Multimeter is between 0 4 and 0 8volts This is not a drive dependent amplifier therefore drive must be at a constant level regardless of main output power Note Theunit will not operate until the exciter is active 3 2 FM1000A User s Manual 6 Before power up place the Local Remote switch located the Metering amp Control board behind the front panel in the Local position and adjust the output power limit to the mid level position using the Local Power Adjust also on the Metering amp Control board see Illustration 3 2 below The unit is normally shipped with this setting See Section 2 6 for setting up remote operation and using the on board remote buttons and other controls 7 Turn on the main power switch located on the front panel of the power supply The unit typically takes 30 seconds to power up Local Remote Slide Switch On board Remote 22 Power Adjust Buttons Local Power Adjust2. Air Exhaust Vents ail 240 VAC IN Illustration 2 4 Rear Panel Connections Installation 2 5 8 Using the supplied connector together pins 6 and 7 of the Remote 1 0 connector The amplifier will not operate without this connection or a remote switch on these pins See Section 2 6 for Remote 1 0 connection 9 If monitoring of the output signal is desired connect the RF monitor cable to the BNC connector on the PA1000 10 Connect the DC input output cables between the PA1000 and the PS1000 as illustrated Illustration 2 4 The connector end with the ground lead con nects to the PA1000 Be sureto attach the ground leads as indicated Note The power lead shield is only grounded at the PA chassis 11 Install the covers over the DC terminals of the PA1000 and the PS1000 using hardware form the hardware kit 1 4 inch X 6 32 bolts with lock washers 12 Connect to your AC power source by inserting the Hubble Twist Lock connec tor into the female Hubble connector on the PS1000 and turn to the right until the connection locks 2 6 Remote Connection The Remote 1 0 Connector on the back of the PA1000 allows remote control and monitoring of Certain transmitter functions There arethree basic control func tions AC on off RF power level adjustment and RF
3. Chee Nil Macc S PTa S Illustration 1 1 FM1000A Amplifier Package 1 2 FM1000A User s Manual 1 2 Amplifier Package Specifications RF Power Output RF Drive Requirement RF Output I mpedance Maximum SWR Frequency Range RF Harmonics Spurious Products Asynchronous AM S N Ratio Synchronous AM S N Ratio Operating Environment Temperature Range Humidity Range AC Power Power Consumption Power F actor Overall Efficiency RF Output Connector Power Amplifier Chassis Power Supply Chassis Weight 100 to 1100 watts continuous with remote controlled power adjust 30 watts for full output 50 ohms unbalanced 1 7 1 With power foldback at high SWR 87 108 MHz Better than 80 dB Better than 55 dB with 10096 modulation at 400 Hz no de emphasis no FM modulation typically gt 60 dB Better than 55 dB with 10096 modulation at 400 Hz no de emphasis FM modulation 5 kHz 9400 Hz typically gt 60 dB 0 50 C at sea level 0 80 at 20 C noncondensing 240 Volts AC 10 15 50 60 Hz Less than 1400 watts at 1000 watts RF output typical 96 typical 70 typical 7 8 in flange 7 16 in DIN optional 7 17 25 x 23 inches 17 78 x 43 82 x 58 42 cm exclusive of rack ears but inclu sive of connectors 5 25
4. ete Uto rein toute 4 3 4 1 3 1 Backplane DC Interconnect Board 22000000 sse 4 3 4 1 3 2 Input Divider ed 4 3 4 1 8 8 Output Combiner Board aso Pent ipei soit tup ta 4 3 4 1 4 Output Filter amp Reflectometer 4 3 4 1 5 Metering Control BOBId ierit tito te 4 4 4 1 6 DC Fuse and Power Distribution Board sse 4 4 2 165 Fase oot Miet AC A 4 4 42 251000 Power Supply S cdi ro tt ente 4 4 421 AC INDUT Board et ua i aA pani 4 5 4 2 2 Power Factor Correcting Switching Board 4 5 42 d OU PUL ete 4 6 4 24 4 6 Section 5 Troubleshooting 5 1 Troubleshooting Flow Chart Analysis ee 5 2 5 2 Digital Multimeter Parameters uii 5 3 5 2 1 In Ref Input Drive Reference ssa 5 3 5 2 2 SWR Standing Wave Ratio sesenta 5 3 523 ALC Automatic Level Control Js D t diei 5 3 524 TOWER D MEE 5 3 TOT 5 4 526 ied 5 4 22277
5. do 5 4 N MME noua 5 4 5 3 5 5 2221 5 5 5 5 m 5 5 5 3 3 1 Potential Causes for Non functioning Cooling 5 5 5 594 A E MM LM 5 6 59 5 Mulliple Indi alors aoo ab aari 5 6 Section 6 Reference Drawings DT esso Dua tes 6 2 6 2 Diagrams Schematics 6 3 Section 7 Service and Support 7 2 2 294 7 2 DANG AILS 7 2 Glossary Index Section 1 Getting Acquainted This section provides a general description of the FM1000A power amplifier system and introduces you to safety conventions used within this document Review this material before install ing or operating the amplifier and power supply Getting Acquainted 1 1 Your Amplifier Package The FM1000A is highly efficient amplifier package designed to set a new standard in FM transmitter design offering modularity ease of use and long term reliabi
6. CS 1 4 Section 2 Installation 2 1 Operating Environment 2 2 2 2 TOUS uii at 2 2 2 3 Unpa king 2 2 E EN 2 3 2 4 1 Power Amplifier MOQU GS eir 2 3 24 2 Hubble Twist Lock amp Connector Wiring eee 2 4 24 Installallol coo tec 2 5 2 6 1 ok oly hot m alls toh SM 2 6 Section 3 Operation 3 1 Initial Power up eee eat ond ta T 3 2 9 2 Power SWitelies oat dta tuae e 3 4 3 2 1 AC Input Circuit Breaket estet e aet pou wa nla DRE 3 4 22 2 SD CPOWOISSWIOHC ces n acci enue eras 3 5 222 3 OWHOI o sacos ten odd pum OM au a ACE 3 5 3 3 Digital M llimeler i to utet un odd 3 6 3 4 So s ted Api 3 7 35 LED f 3 8 Section 4 Principles of Operation 4 1 1000 Power Amplifier uet tetti eti ite beo E ao Pe Lt bai 4 2 44 1 SPowerMOdUles i e bile a ete a ad bed 4 2 4 1 2 Power Combiner Board dud 4 2 dug Backplane 5 1
7. Local Remote Slide Switch On board Remote Power Adjust Buttons Local Power Adjust Pot Illustration 2 6 On board Remote Power amp Related Controls Another remote control function available at pin 5 of the Remote 1 0 Connector turns RF down off Connecting this pin to ground through a resistor allows the RF power output level of the amplifier to be reduced below the internal limit set by the Local Power Adjust pot or the remote Raise Lower settings However some drive power less than one watt may still be present at the antenna Depending on the resistor used this pin can serve as a control for optional low power operation The remaining remote functions are for monitoring the various parameters of the PA1000 They are either buffered metering outputs direct reading or latched high low indications Further details of these functions are described in the pin out table on page 2 8 Note If Remote I O controls are not used tie pin 7 to pin 6 GND For remote 1 0 Input Output connection connect your remote 1 cable from your remote control location to the 25 pin female D sub connector on the back panel of the 1000 The 1 0 Connector on the power amplifier is described in the following diagram 13 1 0000000000000 000000000000 25 14 Illustration 2 7 Remote 1 connector back panel view The Remote 1 0 Connector Pinout Table on the next page summarizes the Remote pin connections Inst
8. FM1000A RF Amplifier Package User s Manual 2005 Crown Broadcast a division of International Radio and Electronics Inc 25166 Leer Drive Elkhart Indiana 46514 5425 U S A 574 262 8900 Revision Control Revision Print Date Initial Release Rev 0 900413 1 November 1998 Revision 1 April 2002 Revision 2 May 2005 Important Notices 2005 Crown Broadcast a division of International Radio and Electronics Inc All rights reserved No part of this publication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language any form by any means without the written permission of Crown International Inc Printed in U S A Crown attempts to provide information that is accurate complete and useful Should you find inadequacies in the text please send your comments to the following address International Radio and Electronics 25166 Leer Drive P O Box 2000 Elkhart Indiana 46515 2000 U S A Contents Section 1 Getting Acquainted 1 1 Your 1 2 1 2 Amplifier Package Specifications 1 3 1 3 Safety Considerations oscuras etse eda bu ta 1 4 1 9 4 ANG CG ates cas ols ad MD aden 1 4 1 3 2 1 4
9. PWR AMPS DC PWR AMPS DC PWR DC PWR AMPS DC PWR AMPB DC PWR AMPS PWR AMPS PWR Lal ED AMP4 DC PWR AMP 1 DC PW DC PWR i Note All bypass capacitors are 0 01 mf Backplane Distribution 6 13 Ribbon Cables Connectors Lr ME M REMOTE PA8 Current Monitor Input Power Reference PA7 Current Monitor Lower Power ound ent Monito o Power Control e a Current Monitor PA4 Current Monitor 20 Coot Monitor 8 Fault Summar Ha Monitor PA Volts 13 RF Output iV 10001 1 DB CONNECTORS VIEWED FROM NSIDE CHASSIS FEMALE DB9 10 CONDUCTOR PWR SUP CONTROL RIBBON CHASSIS LEFT ON FM1000 BACKPLANE BOARO VIEWED FROM CHASSIS FRONT PWR SUP ON_FMLOOO BACKPLANE BOARD VIEWED FROM CHASSIS FRONT CHASSIS RIGHT Ribbon Cables and Connectors FM1000A User s Manual Notes 6 16 FM1000A User s Manual Section 7 Service and Support We understand that you may need various levels of support or that the product could require servicing at some point in time This section provides information for both of these scenarios Service and Support 7 1 7 1 Service The product warranty see opposite page outlines our responsibility for defective products Before retu
10. Pot Illustration 3 2 Local Power Adjust and Other Controls 8 Check the PA1000 parameters with the Digital Multimeter for a current Tot Current of 20 to 30 amps and a voltage PA Voltage of 25 to 35 volts If parameters are within range increase the Local Power Adjust to the maxi Air Intakes Filters zm mam C 2 lt 10002 o5o50o02000 FM POWER SUPPLY Power Switch Illustration 3 3 PS1000 Front Panel Functions mum level of desired operation Note The Local Power Adjust pot is unconventional CW lowers power 9 Using an external remote control unit connected to the Remote I O connector adjust the PA1000 to the maximum power set by the Local Power Adjust This prevents adjusting to higher than permitted power levels Operation 3 3 10 Verify that the following conditions present as indicated by the PA1000 s Digital Multimeter a Ref Should read between 0 4 0 8 volts 0 5 nominal dependent upon power input level SWR Should read 1 05 to 1 5 ALC Should read between 4 00 and 6 00 volts for 1 1 kW output less for lower output or danger conditions i e high SWR d Power Out Should read 1 10 for 1 1 kW output Temp Should read 35 to 50 C with ambient temperature of 25 The remainder of this section describes the functions of the
11. 2 95 CONTROL METERING PS PWR ON i 37 RF FWD GND 2 3B GND GND DRIVE FWD 48 27 J310 FAN2 H m 27V0C B H 45 REM RF PWR UM REM SWR REM PA TEMP REM VOLTS REM PA ALC EE TEMP 546 at 5 E LO ul D 5 5 gt ES M i3 REM PAL T FAULT SUM TEMP 142 N NI 0 TEMP V E ER RE EE m gut REM PWE NJ PAIS h PAIZ PAIS HI 7 gt REM PWR 23 55 4 A REM 4 PAISLO PAIS REM PWR LOWER LO HI lt 2 2 gt EH A ieee al REM RF DRIVE I gt 29 REM PAI ae PAIB LO PAIB HI GND REM t lt m 4 N INTERLOCK_B m E INTERLOCK A n m 72 4 4 POWER DISTRIBUTION AMP1 OC PWR 1 BATTERY Doaa 1 vous PAIS 50V ILES PAIB LO Ceza e PAI LO AMP2 DC PWR I7 ENSEM 1 wr LIED Nr ET eee am gt Kamer ewe tag maus pe nn DC PWR fs ost E DC PWR AMP3 DC PWR AMPI DC PWR AMP4 PWR AMP
12. Elkhart Indiana USA or at a factory authorized service depot Expenses in remedying the defect will be borne by Crown Broadcast including two way ground transportation cost within the continental United States Prior to returning any product or component to Crown Broadcast for warranty work or repair a Return Authorization RA number must be obtained from the Crown Broadcast Customer Service Department Product must be returned in the original factory pack or equivalent Original factory pack materials may be obtained at a nominal charge by contacting Crown Broadcast Customer Service Resolution of the defective product will be made within a reasonable time from the date of receipt of the defective product Warranty Alterations No person has the authority to enlarge amend or modify this warranty in whole or in part This warranty is not extended by the length of time for which the owner was deprived the use of the product Repairs and replacement parts that are provided under the terms of this warranty shall carry only the unexpired portion of the warranty Product Design Changes Crown Broadcast reserves the right to change the design and manufacture of any product at any time without notice and without obligation to make corresponding changes in products previously manufactured Legal Remedies of Purchaser This written warranty is given in lieu of any oral or implied warranties not covered herein Crown Croadcast disclaims all implied w
13. down off The AC power on off remote control function available at pin 7 of the Remote 1 0 Connector turns DC power to the PA on when the pin is grounded TheRF power level adjustment remote control function has an internal maximum limit set on the Metering and Control Board The Local Power Adjust R62 sets the maximum limit of RF power output The limit is set by placing the Remote Local switch SW5 in the LOCAL position and adjusting the Local Power Adjust to your desired maximum limit see illustrations 2 5 and 2 6 However for any remote operation to work the Remote Local slide switch must be in the REMOTE position Then the on board remote RAISE and LOWER push buttons and any external remote switches attached to pins 4 and 15 of the 1 0 Connector can adjust 5V R62 MAXIMUM LOCAL e POWER ADJUST MINIMUM REMOTE RAISE POWER Electro LOCAL TANSMITTER Pin 4 Control CONTROL Remote I O Conn SW3 Circuit SW5 RAISE LOWER POWER Pin 15 i Remote Conn LOWER Illustration 2 5 Local and Remote Functions 2 6 FM1000A User s Manual the level up to that limit and down to zero When specific output power level is set the Metering and Control Board controls and maintains the setting to keep the power constant The location of the Local Power Adjust R62 the on board Raise and Lower switches SW3 amp SW4 and the Local Remote slide switch SW5 are shown below
14. front and rear panel indicators and switches of the PA1000 and PS1000 3 2 Power Switches 3 2 1 AC Input Circuit Breaker The PS1000 supplies power to the PA1000 by converting single phase 220 240 VAC into 50 VDC The PS1000 is protected by a 20 A double pole circuit breaker located on the rear panel This AC input circuit breaker must be the up position as shown below for operation AC Input Circuit Breaker 60 Fans Power 07 240 Illustration 3 4 AC Input Circuit Breaker 3 4 FM1000A User s Manual 3 2 2 DC Power Switch The main on off power switch located on the front panel of the power supply controls high voltage output The control circuit activates this voltage w CTOWNM etl Broadcast M TEES Power Switch Illustration 3 5 DC Power Switch 3 2 3 Interlock Switch This switch is located on the fan mounting bracket in the power supply When the top cover of the power supply is removed the Interlock Switch interrupts the power supply control circuit disabling the high and low voltage supplies WARNING Interlock Switch Illustration 3 6 Interlock Switch Operation 3 5 3 3 Digital Multimeter The 3 digit numeric displa
15. spectrum between audio fre quency and the infrared portion 2 A frequency useful for radio transmission roughly 10 kHz and 100 000 MHz Subsidiary Communications Authorization see subcarrier Signal to Noise Unintended signals present on the transmission output terminal A tolerance or measure of how well a component circuit or system maintains constant operating conditions over a period of time See pilot The amount of left channel information that bleeds into the right channel or vice versa A carrier signal which operates at a lower fre quency than the main carrier frequency and which modulates the main carrier The process used to hold back or stop certain frequencies FM1000A User s Manual SWR THD translator satellator UHF VCO VHF VSWR Wideband Glossary Standing Wave Ratio on a transmission line the ratio of the maximum voltage to the minimum voltage or maximum current to the minimum current also the ratio of load impedance to in tended 50 ohms load impedance Total Harmonic Distortion A transmitter designed to internally change an FM signal from one frequency to another for retrans mission Used in conjunction with terrestrial fed networks A transmitter equipped with an FSK ID option for rebroadcasting a satellite fed signal Ultra High Frequency frequencies in the 300 to 3000 MHz range Voltage Controlled Oscillator Very High Frequency frequenci
16. 0 amplifier and PS1000 supply are packed in an inner box and then placed inside an outer box with styrofoam protective corners in both boxes You will need to unpack a total of four boxes plus two inner boxes Note Save the boxes and packaging material that the individual units are packed in should you need to return them for factory service 2 2 FM1000A User s Manual 2 4 Preinstallation 2 4 1 Power Amplifier Modules The PA1000 incorporates four power amplifiers two each in two modules Due to possible damage during shipment the power modules have been removed Follow these steps to install the modules 1 Remove the front panel of the PA1000 four screws 2 Taking ESD precautions see page 2 2 unpack the power modules and place them on your work area with the circuit sides up __ Connector Warning Slide Rail Illustration 2 1 Power Amplifier Module 3 The warning labels on the front of the modules should all be positioned to the center of the chassis also note the position of the connector on the modules and in the chassis 4 Insert the two power modules using their slide rails into the built in chan nels of the right side cavity as shown below Note that the connectors and warning labels are nearest the middle wall or partition of the PA1000 ry ry ry Module A amps 3 amp 4 Module B amps 7 amp 8 Vacant Cavity Middle Partition Illustration 2 2 Power Amp
17. ATemp PAG AF Drive SWR PAVoltage PAT PATemp ToCuren PAM PAB PADC O CF OUUf 1 e 9 eee MrOAEIEGESE FM POWER AMPLIFIER Illustration 3 8 Fault Indicators Operation 3 7 3 5 Fuse Indicators The PA1000 consists of two field replacable power modules with two amplifiers in each module Each of the paralleled amplifiers is protected by a 10 ampere fast acting fuse When a fuse opens the indicator light next to it illuminates Fuses 3 and 4 represent amplifiers 1 and 2 on thetop right module Fuses 7 and 8 represent amplifiers 3 and 4 on the lower right power module Fuses and Indicators Ot PAS Antenna np RFDrive PAS PAT PA Temp ren I PM PAB 0 cux DSTI Illustration 3 9 Fuse Indicators 3 8 FM1000A User s Manual erono due Persone ci insegn ond insegna E qe je che non ha la dispoziong ary due persor ydo rono
18. RCHASER of a NEW Crown Broadcast product for a period of three 3 years after shipment from Crown Broadcast All products are warranted to be free of defects in materials and workmanship and meet or exeed all specifications published by Crown Broadcast Product nameplate with serial number must be intact and not altered in any way This warranty is non transferable This warranty in its entirety is the only warranty offered by Crown Broadcast No other warranties expressed or implied will be enforceable EXCLUSIONS Crown Broadcast will not warranty the product due to misuse accident neglect and improper installation or operation Proper installation included A C line surge supression lightning protection and proper grounding of the entire transmitter and any other recommendations designated in the Instruction manual This warranty does not extend to any other products other than those designed and manufactured by Crown Broadcast This warranty does not cover any damage to any accessory such as loads transmission line or antennas resulting from the use or failure of a Crown Broadcast transmitter Warranty does not cover any loss of revenue resulting from any failure of a Crown Broadcast product act of God or natural disaster Procedure for Obtaining Warranty Service Crown Broadcast will repair or service at our discretion any product failure as a result of normal intended use Warranty repair can only be performed at our plant facility in
19. allation 2 7 Pin Function PA 8 Current Monitor a buffered metering output with 1 V 2 A PA 7 Current Monitor a buffered metering output with 1 V 2 A Ground 4 Remote RAISE Power a momentary switch on this pin when held low will raise the power level 10 watts every 0 5 seconds 5 Remote RF Power Control a resistor to ground on this pin reduces RF power output level below internal limits See Section 2 6 page 2 7 Ground 7 Remote AC Power On a latching switch on this pin when held low will turn the AC power supply on Fault Summary the voltage from this pin goes to 5 V if any fault occurs and drops below 2V when the fault goes away Ground 10 ALC the voltage from this pin is a direct reading of automatic level control voltage not buffered 11 PA Temperature a buffered metering output with 1 V 20 C 12 SWR a buffered metering output with a calculated reading of standing wave ratio in VDC RF Output Power a buffered metering output with a calculated reading of output power of 1 V 1000 W Input Power Reference a buffered metering output with a DC voltage representing input power Remote LOWER Power a momentary switch on this pin when held low will lower the power level 10 watts every 0 5 seconds 16 PA 6 Current Monitor a buffered metering output with 1 V 2 A 17 PA 5 Current Monitor a buffered metering output with 1 V 2 A 18 Ground 19 PA 4 Current Monito
20. anual Section 2 Installation This section provides important guidelines for installing your power amplifier and power supply Review this information care fully for proper installation Installation 2 1 2 1 Operating Environment You can install the FM1000A amplifier system in a standard 19 inch component rack or on a suitable surface such as a bench or desk In any case the area should be as clean and well ventillated as possible The power supply must be installed directly above or below the power amplifier for the included dressed cables to reach their respective connectors 2 2 Tools Required To install the power supply and power amplifier you will need the following tools Medium phillips screwdriver Medium flat blade screwdriver Small flat blade screwdriver 7 16 Inch wrench nut driver ESD Electrostatic Discharge protection grounding strap and or mat Oo oO 2 3 Unpacking Before handling any exposed printed circuit boards ground yourself with an antistatic strap and or mat CAUTION Possible equipment damage through electronic components The power amplifier power supply and two power amplifier modules are packed and shipped in individual boxes because of their modular nature The FM1K accessory kit is packed inside one of the two power amplifier module boxes For added protection both the PA100
21. arranties including any warranties of merchantability or fitness for a particular purpose Crown Broadcast 25166 Leer Drive Elkhart Indiana 46514 5425 Phone 574 262 8900 Fax 574 262 5399 www crownbroadcast com Service and support 7 3 Notes 7 4 FM1000A User s Manual Factory Service Instructions To obtain factory service complete the bottom half of this page include it with the unit and ship to International Radio and Electronics Company Inc 25166 Leer Drive Elkhart Indiana U S A 46514 5425 For units in warranty within 3 years of purchase from any authorized Crown Dealer We pay for ground UPS shipments from anywhere in the continental U S and Federal Express Second Day service from Hawaii and Alaska to the factory and back to you Expedited service shipment is available for an additional charge You may ship freight collect COD for cost of freight or forward your receipt for shipping charges which we will reimburse We do not cover any charges for shipping outside the U S or any of the expenses involved in clearing customs If you have any questions about your Crown Broadcast product please contact Crown Broadcast Customer Service at Telecphon 574 262 8900 Fax 574 262 5399 Name Company Shipping Address Phone Number Fax Model Serial Number Purchase Date Nature of the Problem Describe the conditions that existed when the problem occurred and what attempts wer
22. ce of 10 is normal For exact set up on site an external power meter is recommended PA Temp Highest temperature of all individual RF power amplifier heatsinks in degrees C PA Voltage Supply voltage of the RF power amplifier Tot Current Sum total current of all individual RF power amplifiers in amperes PA1 8 Individual RF amplifier current reading in amperes 3 6 FM1000A User s Manual 3 4 Fault Indicators Faults are indicated by illuminated red LED s when the following occurs Antenna Load SWR exceeds 1 5 1 ALC voltage is reduced to limit the reflected RF power RF Drive Lack of or insufficient RF drive If the RF drive fault LED is lit input drive must be increased To achieve full output power 30 watts of input drive is required CAUTION Possible equipment damage Do not exceed 40 watts of input drive Damage to the PA1000 will result if this level is exceeded PA Temp PA heatsink temperature is greater than 75 C power foldback will begin at this point PA DC Power supply current for the PA power amplifier is at the preset limit or there is a difference of more than 2 5 amps in current between the individual PAs When this indicator is on ALC the voltage is reduced automatically which holds the supply current to the preset limit Fault Indicators Antenna PAT PAB B P
23. due persone che ayy fano n L gm che non c e nulla nel m a nd ra w go cho non ha la dispozione g ci ins L we 0 fang uM egna a nan qe Vis E ry qu gorao erona due persone oho ay fan we id e g ge cre MMA g ae di matita ci insegn qom che non c e nulla nel 4y um 3 so dE seS g conta matita ciinsegna ano MMC ce nula nel mong p pa om wq Lo arg s5 go con a matta ci insegna a nop lita cl insegn oso oon ta ma segna E ee vo eroro due persone che T wf a ace deron ha la dispozione qu pe che non c e nulla mong aee ealo oy so con e malla insegna a nop d Part Lo tary Section 4 Principles of Operation This section discusses the circuit principles upon which the power amplifier and power supply function This information is not needed for day to day operation but may be useful for ad vanced users and service personnel Principles of Operation 4 1 Introduction The FM1000A is asolid state RF amplifier package designed to deliver 500 to 1000 watts The package consists of two separate compact units a power supply 51000 and power amplifier PA1000 In turn these units consist of modular components which provide for efficient operation as well a
24. e made to correct it Other equipment in your system If warranty has expired payment will be Cash Check VISA Mastercard COD Please Quote before servicing Card Number Exp Date Signature Return Shipment Preference if other than UPS Ground Expedite Shipment Other ENCLOSE WITH UNIT DO NOT MAIL SEPARATELY Service and Support 7 5 Glossary The following pages define terms and abbreviations used throughout this and other Crown Broadcast manuals Glossary G 1 ALC AM bandwidth BCD BFO BNC broadband carrier crosstalk density program deviation DIP distortion DPM EPROM ESD Audio Frequency the frequencies between 20 Hz and 20 kHz in the electromagnetic spectrum Automatic Level Control Amplitude Modulation the process of impressing information on a radio frequency signal by varying its amplitude The range of frequencies available for signalling Binary Coded Decimal a digital system that uses binary codes to represent decimal digits Beat Frequency Oscillator A bayonet locking connector for miniature coax said to be short for Bayonet Neill Concelman As used in the FM transmitter refers to the entire audio spectrum as opposed to the spectrum influ enced by the pre emphasis also called Wideband A continuous signal which is mod
25. er fuses 1 8 replace as indicated by red LED Reduced power output check all fault indicators and troubleshoot accordingly 5 4 FM1000A User s Manual 5 3 Fault Indicators If one of the LED fault indicators is illuminated red troubleshoot using the follow ing suggestions 5 3 1 Antenna Antenna mismatch Q Effects from inclement weather conditions such as icing Check for moisture in the feedline Secure antenna connections 5 3 2 HF Drive Denotes lack of or insufficient drive level Ensure proper drive level of 25 30 watts input power Check RF input cable for secure connection 5 3 3 PA Temp Temperature has reached the internal preset limit for safe operation 75 C Ambient temperature higher than 50 C reduce temperature Restricted air flow remove any obstructions clean dirty air filters by using mild detergent and warm water Antenna mismatch check for icing moisture on the feedline and secure antenna connections Q Overcurrent check PA DC fault indicator if flashing monitor current for proper levels total and individual Power Amps 9 Faulty DC Output Board replace see Section 7 Service amp Support 9 Faulty or non functioning cooling fan determine the cause for malfunction in the following section 5 3 3 1 Potential Causes for Non functioning Cooling Fans The PA1000 has one and the PS1000 has two cooling fans each All three fans are powered by t
26. es in the 30 to 300 MHz range Voltage Standing Wave Ratio see SWR See broadband Index A AC Input Board 4 5 AC Power 1 3 AC power 2 4 ALC 3 4 5 3 Antenna 3 7 mismatch 5 5 antenna 2 5 B Backplane Assembly 4 3 Backplane DC Interconnect Board 4 3 Board Layouts 6 3 Circuit Breaker 3 4 Combiner Board 4 2 Connections 2 5 Connectors Hubble Twist Lock 2 4 Hubble Twist Lock 2 6 connectors 2 5 D DC Fuse and Power Distribution Board 4 4 DC Output Board 4 6 DC Power Switch 3 5 Digital Multimeter 3 6 5 3 E Efficiency 1 3 efficiency 1 2 exciter 1 2 F Fans 4 4 4 6 5 5 Fault Indicators 3 7 5 5 Frequency Range 1 3 Fuse Indicators 3 8 H Humidity Range 1 3 In Ref 3 4 5 3 Input Divider Board 4 3 Installation 2 5 Interlock Switch 3 5 L labels 1 4 M Metering and Control Board 4 4 multimeter display 3 4 0 operation 3 2 Output Combiner Board 4 3 Output Filter amp Reflectometer 4 3 PA DC 5 6 PA Temp 3 4 5 4 PA Voltage 5 4 PFC Power Factor Correcting Switching Board 4 5 power adjust 3 3 Power Consumption 1 3 Power Factor 1 3 Power Module 4 2 Power Out 3 4 5 3 Power Switch 3 4 power switch 3 3 Power up 3 2 Index R remote 1 0 2 7 RF Drive Requirement 1 3 RF Harmonics 1 3 RF Output Impedance 1 3 RF output power 1 2 RF Power Output 1 3 RF power output 1 2 RU spaces 1 2 5 S N Ratio 1 3 Safety 1 4 Schematics 6 3 S
27. escribes procedures for service personnel to diag nose and troubleshoot potential fault conditions in the power amplifier and power supply Troubleshooting 5 1 Troubleshooting Flow Chart Analysis Does your amplifier have output s Sow See Section 3 1 p Initial Power up output at the procedures proper level d z wee mY No gt AN power now Is exciter sufficient RF drive li Check In Ref meter reading Ves Nos y 5 your exciter v turned on Are there any See Section 3 1 fault lt lt Yes gt Initial Power up y indicators T N lt Yes No 2 V Turn the LC di exciter on gt Antenna See Section 5 3 1 _ Secure all Se L connections to the PS2000 RF Drive See m gt Section 5 3 2 PA Temp gt Section 5 3 3 See PA DC See L Section 5 3 4 5 2 Y Ensure AC input circuit breaker is flipped up Y Ensure main power switch is turned on Y Call Support See Section 8 FM1000A User s Manual 5 2 Digital Multimeter Parameters The following procedures are general in nature for in depth service and repair see the Service amp Support section of this manual WARNING Lethal voltages present On
28. g moduleto continue operation at approximately one third of the full output power 4 1 2 Power Combiner Board There aretwo Power Combiner Boards one attached to each of the two heatsinks overlapping the amplifiers Each board takes the power from two amplifiers and combines it through a parallel quarter wave transmission line transformer network The power is then summed in a common point junction on the Output Combiner Board FM000A Users Manual 4 1 3 Backplane Assembly The backplane assembly is located the vertical center of the 1000 behind the power modules The Backplane Assembly is the common connection point for the major sections of the transmitter This assembly consists of the Input Divider Board Output Combiner Board and Backplane Interconnect Board 4 1 3 1 Backplane DC Interconnect Board This board is located nearest the metal inner brace of the chassis It distributes DC power to each of the four MOSFET amplifiers provides the interconnections for control of the power supply and enables connection to the remote control inter face The Backplane DC Interconnect Board contains interconnections from the Control and Metering Board to the DC Fuse and Power Distribution Board as well as power connections to the power amplifier modules 4 1 3 2 Input Divider Board The Input Divider Board is the middle board sandwiched between the Backplane DC Interconnect Board and the Output Combiner Board It provides the
29. hase Illustration 6 3 FM1000A Block Diagram Reference Drawings 6 3 21 Eu 7 9 240 CIRCUIT BREAKER AC 220 VDC NEUTRAL INPUT CCA GROUND 360 VDC 0 to 50 VDC 360 VDC DC OUTPUT CONTROL RETURN 12 VDC i SWITCH VOLTAGE BOOST 5 INDUCTOR DSUB PS CONTROL Illustration 6 4 PS1000 Block Diagram enue N 5495 000 8 9 enue 5495 9000 IW a RF INPUT RF HEFLECTOMETER SPLITTER RE OUTPUT 500W PA OUTPUT FILTER MODULE 2 COMBINER REFLECTOMETER BACKPLANE DISTRIBUTION DC DISTRIBUTION AND FUSE PA i MODULE 4 PA DC POWER Ribbon Cables METERING amp CONTROL CCA 25 cue REMOTE gt nsu amp B NPUT FWRD amp REV POWER 8 PIN Illustration 6 5 1000 Block Diagram INPUT COUPLER 2 DRIVE FWD j JI OUTPUT COUPLER J7 POWER SUPPLY 12vDC 4 if 2 ALC 4 3 12V0E i PS PwR ON n GND 5 Am 5 27YyDC 8 m SPARE J3 REMOTE PA REM PWR ON REM PWR CTRL REM RF PwR 13 REM PWR RAISE REM PA ALC 7 23 QWLR E ss nr 2 28 REM PAIB Reference Drawings
30. he same circuit of the PS1000 There are two potential causes for a non functioning fan or fans 1 If asinglefan does not operate the fan is faulty and must bereplaced See Section 7 Service amp Support 2 If none of the fans operate a blown circuit breaker a short circuit in the PS1000 or a damaged winding on the main transformer of the DC Output Board in the PS1000 isthe cause In this case do one of the following Troubleshooting 5 5 The circuit breaker is located the rear panel of the power supply If the breaker has popped out reset it by pushing it in If the breaker continues to trip check for short circuit b Check each fan with a volt ohm meter by disconnecting and testing it for a short circuit Replace the fan fans as needed see Section 7 c If none of the fans have short circuits there is damage on the winding of the transformer It will have to be replaced see Section 7 5 3 4 Discrepancy in current between the individual amplifiers in total current Thereis a difference of current greater than 2 5 amps between any one of the 4 individual amplifiers This could occur as a result of a blown or faulty power module or a blown fuse replace as appropriate see Section 7 Service amp Support Thereistoo much total current power foldback will occur above maximum total amperage of 35 amps due to antenna mismatch Examine the antenna for arcing and moisture Al
31. l ity The FM1000A package includes a PA1000 amplifier PS1000 power supply and an FM1K accessory pack The PA1000 broadband amplifier requires no tuning and typically provides 8096 RF efficiency across the band The PS1000 power supply is power factor corrected and 90 efficient Modern MOSFET technology ensures high AC to RF efficiency better than 7096 overall and long term reliability The unmatched efficiency of this power amplifier significantly improves your bottom line by providing cooler operation and lower power costs These modular units are uniquely designed to be lightweight and compact for convenient shipping and require only seven RU spaces for installation Installa tion is made simple with just three interconnections between the amplifier and power supply In addition built in digital metering and status indicator capabili ties enable intuitive operation to further augment the user friendly design Economic long term reliability is ensured through our carefully engineered solid state design The PA1000 features two field replaceable 500 watt power modules This power amplifier delivers 500 to over 1000 watts of RF power output Use your existing exciter or purchase the FM1000T which includes our award winning FM30 exciter for an unbeatable 1 kW transmitter package a ns as mH oO Mm oo O rbi m oo 6
32. l other connections are made and installation is complete 2 4 FM1000A User s Manual 2 5 Installation 1 DC Input PA1000 PS1000 Ground Screws Mount the units in an appropriate 19 inch wide cabinet The power supply must be installed directly below the power amplifier for the included cables to reach their respective connectors see illustration 2 4 below Note The PS1000 weighs approximately 40 pounds 18 1 kg the PA1000 approximately 43 pounds 19 5 kg Use help to install Ensure that the PS1000 power switch is off the circuit breakers of the 240 VAC source on the back panel are off and the AC connector is not plugged in Install the exciter source such as a Crown Broadcast FM30 according to its instructions Connect the RF input cable from the exciter source to the N connector on the back of the PA1000 Connect the RF output cable from the antenna to the 7 8 EIA or 7 16 DIN connector on the back of the PA1000 Connect one end of the supplied control cable to the 9 pin D sub connector on the PA1000 Connect the other end of the control cable to the 9 pin D sub connector on the PS1000 RF Monitor Optional Connection RF Input Air Intakes Filters RF Output
33. lifier Module Placement 5 Besure the modules are pushed in completely so that the connector makes proper contact 6 Replace the front panel of the PA1000 Installation 2 3 2 4 2 Hubble Twist Lock Connector Wiring Prepare the wiring for the Hubble Twist Lock connector in the following manner before connecting to your AC power source 1 Use round cord with a diameter of 0 385 0 780 inches 10 20 mm SJ 12 3 10 3 Type S 16 3 10 3 2 Select conductor size from your National Electrical Code 3 Slide the cover onto the cord Remove insulation from cable and conductors as shown in Illustration 2 3 Do not tin conductors 1 Inch l lt 25 gt 16 Illustration 2 3 Cover Cable amp Conductors 4 Loosen terminal screws Insert conductors fully into proper terminals cording to the table below Take caution that there are no stray wire strands Terminal Green Hex Head Screw Equipment grounding conductor green or green yellow Brass Screw Hot circuit conductor 240 VAC NOT white NOT green Brass Black Screw Hot circuit conductor 240 VAC NOT white NOT green 5 Tighten terminal screws to 18 pound inches 2 1 of torque 6 Tighten assembly screws to 10 pound inches 1 1 of torque 7 Tighten cord clamp screws to 10 pound inches 1 1 of torque A WARNING Possible Electric Shock Hazard Do not connect AC source until al
34. ly technically qualified individuals shoud attempt troubleshooting service procedures If any abnormal readings are displayed for any of the following parameters on the Digital Multimeter try troubleshooting in the following manner 5 2 1 In Ref Input Drive Reference If this indication of drive level is not between 0 4 and 0 8 volts then C Check the exciter to ensure proper power input level of 25 30 watts Check RF input cable for secure connection 5 2 2 SWR Standing Wave Ratio If the SWR is over 1 5 1 then look for C effects of inclement weather such as icing on the antenna and feed line for moisture in the feedline insecureantenna connections 5 2 3 ALC Automatic Level Control If this indication is not between 4 00 and 6 00 volts for 1 1 kW output then Check for overheating see PA Temp fault LED Check for overcurrent see PA DC fault LED C Check for high SWR see Antenna fault LED 5 2 4 Power Out This reading is user adjustable but for full output should read 1 10 for 1 1 kW If lower than desired check for proper input drive and or proper adjustment of the Local Power Control see section 3 1 6 Troubleshooting 5 3 TROUBLE 5 2 5 PA Temp The meter should read between 35 50 C with an ambient temperature of 25 C If temperature is 75 C or above then check and do the following Ambient temperature higher than 50 C reduce temperat
35. onnects to a 12 volt DC power supply and three relays The 12 volts is used to close the three relays when the DC Power Switch on the front panel is switched on In addition the 12 volts are supplied to the PA1000 for use the Control and Metering Board The 240 volt AC input to the power supply is connected through a Hubble Twist Lock connector the back panel to 20 amp circuit breaker mounted inside the back panel When the power supply is turned on and enabled the AC power comes through torroidal inductors which prevent harmonics and spurious products from feeding back into the AC power lines The current flows from the inductors to a bridge rectifier that converts the current to DC Power and from there to the PFC Switch ing Board where the rectified DC is filtered The filtered DC power is then fed from the PFC Switching Board through an 80 turn boost inductor and back to the PFC Switching Board 4 2 2 PFC Power Factor Correcting Switching Board The PFC Switching Board is located directly behind the cooling fans front panel in the PS1000 This board takes the voltage from the Torroidal Boost Inductor and sends it to the Boost Switching Transistor The switching transistor chops the DC input power at a 25 kHz rate The chopped voltage is then rectified filtered and sent as DC voltage to a set of four transistors which form a second switching stage The second switching stage chops the DC voltage at a 22 5 kHz rate This ch
36. opped DC power is fed through a blocking capacitor to a transformer on the DC Output Board The second switching stage controls the amount of power sent to the DC Output Board This ensuresthat the transformer output voltage and current are correct for providing the selected RF output power to the amplifier Principles of Operation 4 5 4 2 3 DC Output Board The DC Output Board is located in the back of the unit directly behind the PFC Switching Board This board rectifies and filters the transformer output voltage once again to produce the clean DC power required for the power modules The DC Output Board also provides the 24 volts that operate the cooling fans in both the PS1000 and the PA1000 Therearetwo parallel paths from the DC Output Board with half the power going through each set of output cables These cables come together at theterminal in back of the unit providing the maximum output power of 50 volts at 60 amperes 4 2 4 Cooling Fans There are two cooling fans located in the front section of the PS1000 Their pri mary function is to cool the semiconductors used in the switching and rectifying process which are subject to high currents The fans blow cool air through the heatsinks and out through the vents on the back and side panels of the PS 1000 The fans have a dedicated circuit breaker located on the back panel of the power supply 45 User s Manual Section 5 Troubleshooting This section d
37. or shifting the frequency of the main carrier at a Morse code rate Used in the on air identification of frequencies The process of reducing the gain of a given ampli fier Undesirable energy at integral multiples of a desired fundamental frequency High Frequency Frequencies in the 3 0 to 30 0 MHz range Frequencies affected by the pre emphasis Integrated Circuit Input Output Light Emitting Diode The process by which a carrier is varied to repre sent an information carrying signal Metal Oxide Semiconductor Field Effect Transistor a voltage controlled device with high input imped ance due to its electrically isolated gate A transmission within a localized geographic area ranging from a single room to a several kilome ters Power Amplifier PAI PAV pilot pre emphasis processing receiver RF SCA S N spurious products stability stereo pilot stereo separation subcarrier suppression Power Amplifier Current Power Amplifier Voltage A 19 kHz signal used for stereo transmissions The deliberate accentuation of the higher audio frequencies made possible by a high pass filter The procedure and or circuits used to modify incoming audio keeping its level around 75 kHz deviation to make it suitable for transmission An option which adds incoming RF capability to an existing transmitter See also Translator Radio Frequency 1 A specific portion of the electromagnetic
38. power division and impedance transformation needed to supply proper drive to each of the four amplifiers two modules 4 1 3 3 Output Combiner Board The Output Combiner Board is located nearest the Output Filter It consists of a micro strip transmission line that combines the output power from the four ampli fiers two modules so that ultimately all the power comes together at one common point junction Here the currents voltages of all four power amplifiers are in phase and producing equal RF output power From this common point junction the Output Combiner Board uses a second quarter wave transformer to convert the output power to the 50 ohm impedance needed at the output of the unit 4 1 4 Output Filter amp Reflectometer The Output Filter Reflectometer is located behind the Backplane Assembly in the center of the PA1000 See the accompanying schematic in Section 6 for more information The ninth order elliptic low pass filter attenuates harmonics generated in the power amplifier The capacitors for the filter are circuit board pads The reflecto meter uses printed circuit board traces for micro strip transmission lines Trans mission line segments with an impedance of about 100 ohms on either side of a 50 ohm conductor provide sample voltages representative of the square root of forward and reverse power DC voltages representative of forward and reflected power go through a bulkhead Filter Board to the Backplane DC Inte
39. purious Products 1 3 SWR 1 3 3 4 5 3 Index ii T Tot Current 5 4 transmitter package 1 2 Troubleshooting Flow Chart 5 2 U Unpacking 2 2 W Weight 1 3
40. r a buffered metering output with 1 V 2 A PA 3 Current Monitor a buffered metering output with 1 V 2 A 21 Ground PA 2 Current Monitor a buffered metering output with 1 V 2 A 23 PA 1 Current Monitor a buffered metering output with 1 V 2 A PA Total Current Monitor a buffered metering output with 1 V 20 A PA Volts a buffered metering output with 1 V 10 V Note PA Power Amplifier Remote I O Connector Pinout Table 2 8 FM1000A User s Manual Section 3 Operation This section provides general operating parameters of your power amplifier system and a detailed description of the front panel display Operation 3 1 Initial Power up Procedures These steps summarize the operating procedures you should use for the initial operation of the power amplifier and power supply More detailed information follows 1 Ensure that the external remote control unit is properly connected See the Pin Out Description Table Section 2 6 page 2 8 for proper pin configura tion If not using aremote control unit pin 7 must be tied to ground pin 6 2 Connect Antenna 3 If using an external remote control enable the power supply via the remote 1 0 connector 4 Turn on flip up the AC input circuit breaker located on the rear panel of the power supply do not turn on the front panel power switch yet Outputs to PA1000 AG input Circuit Breaker Circuit Breaker DC Oiitpit
41. rconnect Board then to the Metering Board where they are processed for power control and metering and for SWR metering and protection Principles of Operation 4 3 4 1 5 Metering and Control Board The Metering and Control Board is located above the upper left cavity This board supplies readings of voltages and currents and provides information on the opera tion of the amplifier The Local Power Adjust pot sets the upper limit maximum of RF power output The on board RAISE and LOWER push buttons and any external remote control of the power level is activated within that limit by placing the Local Remote slide switch on the board into the Remote position When a specific output power is set the Metering and Control Board controls and maintains the setting keeping power constant A long life battery supplies power to retain the power setting after the amplifier is turned off This board also takes samples from the RF amplifier boards and PS1000 power supply and processes all the data It provides SWR readings from the Output Filter and folds back the amplifier power if the SWR exceeds safe operating limits Protec tion circuitry for overcurrent and overtemperature conditions is designed into this board as well providing additional precaution against overheating This board is fail safe like all the other circuit board components in the FM1000A and can be removed for repair replacement if necessary 4 1 6 DC Fuse and Power Distribu
42. rning a product for repair or replacement our choice call our Customer Service department using the following telephone number 866 262 8917 Our Customer Service Representative will give you further instructions regarding the return of your product Use the original shipping carton or a new one obtained from Crown Place shipping spacers between the slide out power amplifier assem bly and the back panel Please fill out the Factory Service Instructions sheet page 7 5 and include it with your returned product 7 2 24 Hour Support In most instances what you need to know about your product can be found in this manual There are times when you may need more in depth information or even emergency type information We provide 24 hour technical assistance on your product via a toll telephone call For emergency help or detailed technical assistance call 866 262 8917 You may be required to leave a message at this number but your call will be returned promptly from our on call technician 7 3 Spare Parts To obtain spare parts call Crown Broadcast Sales at the following number 866 262 891 You may also writeto the following address Service Manger International Radio and Electronics Company Inc 25166 Leer Drive Elkhart Indiana U S A 46514 5425 7 2 FM1000A User s Manual Crown Broadcast Three Year Limited Product Warranty SUMMARY OF WARRANTY Crown Broadcast IREC warrants its broadcast products to the ORIGINAL PU
43. s ease of service 4 1 PA1000 Power Amplifier The PA1000 power amplifier features adjustable output to deliver 500 1000 watts of RF output power for broadcast transmission The amplifier is broadband no tuning is required The design however ensures efficient operation Typical RF efficiency is 7596 to 85 across the FM band 4 1 1 Power Modules The primary components of the PA1000 are two 500 watt power modules These power modules are mounted by stacking two in the right cavity of the chassis The two slots on the left side are unpopulated The chassis of the power modules acts as a heat sink for the MOSFET amplifiers There are two power amplifiers mounted to spacer plates on each of the heat sinks for atotal of four power amplifiers all The power amplifiers are the same as those utilized in the Crown Broadcast 100 250 and 500 watt transmitters Power from the amplifiers is combined through a micro strip combiner to convert from 50 output impedance for each amplifier to an intermediate impedance and then return to the 50 output at the Low Pass Filter This technology eliminates tuning and adjustments throughout the 88 108 FM band and enables each amplifier to equally share the power load The power combiner is also designed to allow a moduleto be disconnected from the combiner and removed without adversely affecting the impedance balance of the unit With one module removed the imped ance change allows the remainin
44. so check output power for proper current the RF detection circuit could malfunction causing an overcurrent situation 5 3 5 Multiple Indicators Call your Crown Broadcast service representative See Section 7 Service and Support for contact information 221117 2 HEEE broadcast f 9 Sos 9 5 6 FM1000A User s Manual 4 1 le E 000 Section 6 Reference Drawings The illustrations in this section may be useful for making adjustments taking measurements troubleshooting or understanding the circuitry of your RF power amplifier and power supply Reference Drawings 6 1 6 1 Views DEMO d LS ets un pM MM MEE KM KR esc OU COPIE S Illustration 6 1 Front View 240 VAC IN Illustration 6 2 Back View 6 2 FM1000A User s Manual 6 2 Diagrams and Schematics 1 kW Power Output RF Input 30 W Exciter Excitation PA1000 Crown FM30 Power Amplifier 4 gt Remote 1 0 Connector Power Supply Control 0 50 VDC PA Supply 51000 Power Supply 240 VAC 50 60 Hz Input Power Single P
45. tion Board This board is located above the right cavity over Power Modules A and B The DC Fuse and Power Distribution Board takes power direct from the power supply through one 80 amp power line divides it into four separate DC power lines and distributes it to the four power amplifiers Metering resistors in each of the four power lines monitor the current drawn by each of the four amplifiers to ensure proper function for monitor and control of the unit 4 1 7 Cooling Fans There is a cooling fan located in the back of the PA1000 powered by the 51000 The fan operates at 24 volts and is rated at 235 cubic feet per minute Cool air is drawn through the heatsinks where a flushing moves the air over the DC Distribu tion Fuse board the Control and Metering Board the Output Filter circuits and then out through the air vents on the side panel If a fan fails the amplifier will fold back power to prevent overheating 4 2 PS1000 Power Supply The PS1000 supplies power to the PA1000 by converting single phase 240 VAC into 50 VDC The PS1000 is protected by a 20 A double pole circuit breaker This highly efficient power supply utilizes switching technology and is power factor corrected The PS1000 consists of three printed circuit boards described below 4 FM1000A User s Manual 4 2 1 Input Board The AC Input Board is located on the left side of the PS1000 AC power from the circuit breaker connects to the AC Input Board where it c
46. ulated with a second information carrying signal In FM broadcasting this term generally refers to the interaction between the main L R and the subcarrier L R signals as opposed to separation which generally refers to leakage between left L and right R channels A high average of modulation over time The amount by which the carrier frequency changes either side of the center frequency Dual In line Package term used to describe an IC or socket that has two parallel rows of pins The unwanted changes in signal wave shape that occur during transmission between two points Digital Panel Meter Erasable Programmable Read Only Memory Electrostatic Discharge a discharge that is poten tially distructive to sensitive electronic compo nents FM1000A User s Manual exciter FET frequency synthesizer FM FSK gain reduction harmonics HF Highband IC I O LED modulation MOSFET nearcast PA Glossary 1 A circuit that supplies the initial oscillator used in the driver stage 2 A transmitter configuration which excludes stereo generation and audio processing Field Effect Transistor A circuit that generates precise frequency signals by means of a single crystal oscillator in conjunc tion with frequency dividers and multipliers Frequency Modulation the process of impressing information on a radio signal by varying its fre quency Frequency Shift Keying an FM technique f
47. ure Q Restricted air flow remove any obstructions clean dirty air filters by using mild detergent and warm water Possible antenna mismatch check for icing moisture the feedline and secure antenna connections Overcurrent If PA DC fault indicator is flashing monitor the current for a proper level thetotal current and the current of individual Power Amps 5 2 6 PA Voltage Supply voltage to the RF power amplifiers should be 50 V If it is not check drivelevel to ensure proper power level input of 30 watts for high SWR for overcurrent check PA DC fault indicator and if flashing check current for proper levels total and individual Power Amps for overtemperature ambient temperature higher than 50 C reduce tempera ture Check air flow remove any obstructions and clean dirty air filters 5 2 7 Tot Current If total current reading is over 35 amperes then check or do the following 1 Reduce power output check all fault indicators and troubleshoot accordingly 9 Ifoneor more of the 250 watt power modules has failed replace High SWR check for icing moisture in the feedline and secure antenna connections 5 2 8 PA1 8 If thereis 2 5 amps or more difference between the individual PA current readings 7 to 9 amps typical then check the following Failed faulty power module reading directly correlates to failed power mod ule replace 9 Blown individual power amplifi
48. x 17 25 x 23 inches 13 34 x 43 82 x 58 42 cm exclusive of rack ears PA1000 40 pounds 18 1 kg RF PA Modules 8 pounds 3 6 kg each PS1000 43 pounds 19 5 kg Note System performance is specified using Crown Broadcast Model FM30 Exciter where applicable Getting Acquainted 1 3 Safety Considerations Crown Broadcast assumes the responsibility for providing you a safe product and safety guidelines during its use Safety means protection to all individuals who install operate and service the transmitter as well as protection of the transmitter itself To promote safety we use standard hazard alert labeling on the product and in this manual Follow the associated guidelines to avoid potential hazard 1 3 1 Dangers DANGER represents the most severe hazard alert Extreme bodily harm or death will occur if DANGER guidelines are not followed 1 3 2 Warnings WARNING represents hazards which could result in severe injury or death 1 3 3 Cautions CAUTION indicates potential personal injury or equipment or property damage if the associated guidelines are not followed Particular cautions in this text also indicate unauthorized radio frequency operation Type of Hazard Severe shock hazard T a Turn power off and Pictorial Indication wait approximately 1 Explanation of of Hazard minute for capacitors Hazard to discharge before handling them Illustration 1 3 Sample Hazard Alert 1 4 FM1000A User s M
49. y in the upper left corner of the front panel provides information on the amplifier s operation Use the up and down push buttons to select one of the following parameters as indicated by a green LED Multimeter Metering Selection Buttons Metering Indicators a Power Out PAS Antenna PAS InRet PATemp PAG RFDrive SWR PAVoltage PATemp C ALC PAB c 5 Crown So es 105 Sonya coves a e ws FOSEIGESE EE e e Illustration 3 7 Digital Multimeter In Ref Input reference is a relative voltage level used to determine input RF power level This varies between frequency of operation and input power level SWR Direct reading of the antenna Standing Wave Ratio the ratio of the actual load impedance to the desired 50 ohm load impedance ALC Automatic level control is DC gain control bias used to regulate PA supply voltage With the PA power supply at full output voltage ALC will read about 6 0 volts When the RF output is being regulated by the RF power control circuit this voltage will be reduced typically reading 5 0 to 6 0 volts The ALC voltage will be reduced during PA DC overcurrent SWR or overtemperature conditions Power Out Actually reads RF voltage squared so the accuracy can be affected by SWR Toleran
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