Related Manuals for Crown FMX30
Summary of Contents for Crown FMX30
- Page 1 ©2003 Crown Broadcast, a division of International Radio and Electronics, Inc. 25166 Leer Drive, Elkhart, Indiana, 46514-5425 U.S.A. (574) 262-8900...
- Page 2 Printed in U.S.A. Sony and RCA are trademarks of their respective companies. IREC 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: FMX30/FMX100/FMX250 User’s Manual...
-
Page 3: Table Of Contents
Rev. 1.0 Table of Contents Table of Contents iii Section 1—Getting Acquainted 1.1 Your Transmitter ..................1-2 1.2 Applications and Options................1-3 1.2.1 Stand-Alone.....................1-4 1.2.2 Backup ....................1-4 1.2.3 Booster....................1-4 1.2.4 Exciter .....................1-4 1.2.5 Translator ....................1-5 1.2.6 Satellator ....................1-6 1.2.7 Nearcasting .....................1-6 1.3 Transmitter/Exciter Specifications ...............1-7 1.4 Receiver Specifications................1-9 1.5 Safety Considerations ................1-10 1.5.1... - Page 4 4.10 RF Driver (FM100/FM250) ................4-9 4.11 RF Amplifier (FM100/FM250) ..............4-9 4.12 Chassis ......................4-10 4.13 RF Output Filter & Reflectometer ...............4-11 4.14 Receiver Circuit Board Option..............4-11 Section 5—Service and Support 5.1 Service......................4-2 5.2 24–Hour Support..................4-2 5.3 Spare Parts....................4-2 FMX30/FMX100/FMX250 User’s Manual...
- Page 5 Rev. 1.0 I NFORMATION This section provides a general description of the FMX30, FMX100, and FMX250 transmitters and introduces you to safety conventions used within this document. Review this material before installing or operating the transmitter. Getting Acquainted 1—1...
- Page 6 Rev. 1.0 The FMX30, FMX100, and FMX250 are members of a family of FM stereo broadcast transmitters. Crown transmitters are known for their integration, ease-of-use, and reliability. The integration is most apparent in the standard transmitter configuration which incorporates audio processing, stereo generation, and RF amplification without compromised signal quality.
- Page 7 Rev. 1.0 Crown transmitters are designed for versatility in applications. They have been used as stand-alone and backup transmitters and in booster, translator, satellator, and nearcast applications. The following discussion describes these applications further. Model numbers describe the configuration of the product (which has to do with its intended purpose) and the RF output power which you can expect.
-
Page 8: Stand-Alone
Transfer switches on each side of the existing and backup transmitters make the change-over possible with minimal downtime. The DC operation option of the FMX30, FMX100, and FMX250 make them attractive backup units for those times when AC power is lost. -
Page 9: Translator
Rev. 1.0 1.2.5 Translator The FMX30R receiver option replaces the audio processor and stereo generator boards with a receiver module. This added feature makes Crown transmitters ideal for translator service in terrestrial-fed networks. These networks represent a popular and effective way to increase your broadcasting coverage. Translators, acting as repeater emitters, are necessary links in this chain of events. -
Page 10: Satellator
Crown transmitters have been used in this way for language translation, for rebroadcasting the audio of sporting events within a stadium, and for specialized local radio. Crown makes a dedicated nearcast transmitter. However, the FMX30 is also appropriate for this application. 1—6 FMX30/FMX100/FMX250 User’s Manual... - Page 11 Rev. 1.0 Frequency Range 87.9 -107.9 MHz RF Power Output (VSWR 1.5:1 or better) FMX30 3-30 watts, adjustable FMX100 10-100 watts, adjustable FMX250 20-250 watts, adjustable 50 Ω RF Output Impedance Frequency Stability Meets FCC specifications from 0-50 degrees C 50 k Ω...
- Page 12 (5.25 x 16.5 x 17.5 inches) Weight FMX30 10.5 kg (23 lbs) 13.6 kg (30 lbs) shipping weight FMX100 11.4 kg (25 lbs) FMX250 14.5 kg (32 lbs) shipping weight 16.8 kg (37 lbs)20.0 kg (44 lbs) shipping weight 1—8 FMX30/FMX100/FMX250 User’s Manual...
- Page 13 Rev. 1.0 Monaural Sensitivity 3.5µV for signal-to-noise > 50 dB (demodulated, de-emphasized) 12.6µV for signal-to-noise > 60 dB Stereo Sensitivity 2.8µV for signal-to-noise > 40 dB (19–kHz pilot frequency added) 8 µV for signal-to-noise > 50 dB 31 µV for signal-to-noise > 60 dB Standard type N, 50 Ω...
-
Page 14: Dangers
Rev. 1.0 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. -
Page 15: Section 2-Installation
This section provides important guidelines for installing your transmitter. Review this information carefully for proper installation. Installation 2—1... -
Page 16: Power Connections
Do not locate the transmitter directly above a hot piece of equipment. The FMX30, FMX100, and FMX250 operate on 100, 120, 220, or 240 volts AC (50 or 60 Hz; single phase). Each transmitter can operate on DC power as well (28 volts for the FMX30, 36 volts for the FMX100, and 62 volts for the FMX250). - Page 17 Rev. 1.0 120Vac Illustration 2–1 Removing the Power Connector Cover 120Vac 220Vac 240Vac Illustration 2–2 Selecting an AC Line Voltage Installation 2—3...
-
Page 18: Fuses
VAC operation, use the slow-blow fuse located in a hardware kit within the transmitter packaging. Consult the following table: Transmitter Input Power Fuse FMX30 100-120 V 220-240 V 1.5A FMX100 100-120 V 220-240 V FMX250 100-120 V 12.5A 220-240 V 6.3A Table 2-1 Fuse Chart 2—4 FMX30/FMX100/FMX250 User’s Manual... -
Page 19: Frequency (Channel) Selection
This chip is replaceable. Should you need to change the location of your translator, contact Crown Broadcast for a replacement chip with your new FSK ID. To disable auto ID, remove the jumper from the auto ID location on header HD2 on the RF Exciter Board. - Page 20 Note: If you requested it, the FSK chip on the RF Exciter Board has been pre-programmed for your operating frequency. This chip is replaceable. Should you need to change the location of your translator, contact Crown Broadcast for a replacement chip with your new FSK ID. Replace the top cover before operating the transmitter.
-
Page 21: Receiver Frequency Selection
Rev. 1.0 Freq SW2 Freq Freq SW1 SW2 Freq SW 1 SW2 87.9 92.9 97.9 102.9 88.0 93.0 98.0 103.0 88.1 93.1 98.1 103.1 88.2 93.2 98.2 103.2 88.3 93.3 98.3 103.3 88.4 93.4 98.4 103.4 88.5 93.5 98.5 103.5 88.6 93.6 98.6... - Page 22 If your transmitter is equipped with the receiver option, connect the incoming RF to the RF IN connector. RF Output RF Input Connector (receiver option only) 120Vac RF Output Monitor Illustration 2–6 RF Connection 2—8 FMX30/FMX100/FMX250 User’s Manual...
-
Page 23: Audio Input Connections
Rev. 1.0 Attach audio inputs to the Left and Right XLR connectors on the rear panel. (The Left channel audio is used on Mono.) Pin 1 of the XLR connector goes to chassis ground. Pins 2 and 3 represent a balanced differential input with an impedance of about 50 k Ω. - Page 24 R503 TL072 C503 C504 220PF 24.9K 220PF A501 -12V 100PF R502 J501 DIP8 +12V 24.9K 24.9K R501 100PF 30.1K C501 C502 220PF 220PF Left 24.9K TL072 XLR CON. 100PF -12V 24.9K Illustration 2–8 Audio Input Circuit 2—10 FMX30/FMX100/FMX250 User’s Manual...
- Page 25 Rev. 1.0 You can connect external SCA generators to the SCA In connectors (BNC-type) on the rear panel. The inputs are intended for the 60 kHz to 99 kHz range, but a lower frequency may be used if the transmitter is operated in Mono mode. (The 23 to 53 kHz band is used for stereo transmission.) For 7.5 kHz deviation (10% modulation), input of approximately 3.5–volts (peak-to-peak) is required.
-
Page 26: Audio Monitor Connections
As a result, the occupied bandwidth specifications of the transmitter could be compromised. The 15–Hz high-pass filters are also bypassed which may mean that modulation with frequencies below 10 Hz could cause the frequency synthesizer to unlock. 2—12 FMX30/FMX100/FMX250 User’s Manual... - Page 27 Rev. 1.0 You can enable an automatic turn-off of the carrier in the event of program failure. To enable this option, selecte a setting from Table 2-3, Fault Time-out Values. The time between program failure and carrier turn-off is set by a jumper (JP701) on the voltage regulator board.
- Page 28 15–pin, D-sub connector on the rear panel. (No connections are required for normal operation.) Remote I/O RIGH T LEFT/MONO SCA IN MONITOR COMPOSIT E IN REMOTE I/O CIRCUIT BREAKER – 36 VDC Illustration 2–12 Remote I/O Connector Table 2-4, Remote I/O Connector, summarizes the Remote I/O pin connections. 2—14 FMX30/FMX100/FMX250 User’s Manual...
-
Page 29: Remote I/O Connector
Rev. 1.0 Pin Number Function Ground (no connection) Composite Out (sample of stereo generator output) FSK In (Normal ly high; pull low t o shift carrier frequency approximately 7.5 kHz. Connect to open collect or or relay contacts of user-supplied FSK keyer. ) /A ut o Carrier Off (Pull l ow t o enable automatic t urnoff of carrier with program failure.) Meter Battery (unregulated DC voltage;... - Page 30 Rev. 1.0 2—16 FMX30/FMX100/FMX250 User’s Manual...
-
Page 31: Section 3-Operation
This section provides general operating parameters of your transmitter and a detailed description of its front panel display and controls. Operation 3—1... -
Page 32: Front Panel
The display holds briefly (about 0.1 seconds) after the peak. The “Pilot” indicator illuminates when the transmitter is in the stereo mode. To verify the actual (or more precise) modulation percentage, connect a certified modulation monitor to the RF monitor jack on the rear panel. 3—2 FMX30/FMX100/FMX250 User’s Manual... - Page 33 Rev. 1.0 Carrier SwitchThis switch controls power to the RF amplifiers and supplies a logic high to the voltage regulator board, which enables the supply for the RF driver. In addition, the Carrier Switch controls the operating voltage needed by the switching power regulator.
-
Page 34: Dc Breaker
Settings is distributed. The default setting for the Settings password is “0000”. You may change the Settings password from the Settings functions. 3.3.2 Main Function List Main Function list in FMX are grouped as follows • Readings • Settings • Factory • Audio Monitor • Fault Log 3—4 FMX30/FMX100/FMX250 User’s Manual... -
Page 35: Readings Function List
Rev. 1.0 When initially powered, the main function list is displayed. Use the control knob to select one of the main functions. When a main function is selected, the main function list is replaced with a sub function list. 3.3.3 Readings Function List Readings functions are for operators to use to verify proper operation of the transmitter. -
Page 36: Settings Function List
ABC Override : This control puts the unit into Analog Back-up Control. The processor has no control over operation in this mode. Back : Returns to the previous menu selection SECONDARY : Settings for the real-time clock. Date/Time : 3—6 FMX30/FMX100/FMX250 User’s Manual... -
Page 37: Factory Setting Functions
Rev. 1.0 New password : Change the Settings password. RMS Board : Select RMS option ON/OFF RMS Menu : Select this menu to change the three different phone numbers stored in the RMS unit. Phone numbers are edited directly by selecting the appropriate number. -
Page 38: Apply Power
1. Turn on the Carrier switch 2. Check the following parameters from the [Readings] [primary] list. RF Power : RF Power varies by model: 29–33 watts for the FMX30 95–110 watts for the FMX100 250-275 watts for the FMX250 SWR : Standing wave ratio should be less than 1.1. A reading greater than 1.25 indicates an antenna mismatch. - Page 39 Rev. 1.0 PS DC V : Supply DC volts varies by model: 45 volts with the carrier on and 50 volts with the carrier off for both the FMX30 and FMX100 products. FMX250, the readings should be 65 volts with the carrier on and 75 volts with carrier off.Voltmeter should be reading 0.0.
- Page 40 Rev. 1.0 3—10 FMX30/FMX100/FMX250 User’s Manual...
-
Page 41: Section 4-Principles Of Operation
ta ci n ha ' e n n h a ta ci 'e n n ha ta ci ' e n 'e n ta ci ta ci ta ci n ha 'e n ta ci This section discusses the basic circuit principles upon which the transmitter functions. -
Page 42: Block Diagram
Rev. 1.0 Illustration 4-1 Block Diagram 4—2 FMX30/FMX100/FMX250 User’s Manual... -
Page 43: Balanced Input
Rev. 1.0 The audio processor board (Illustration 4-2) performs five functions: • Balanced input amplifier • Gain selection • Low-pass filter • Signal compression, limiting and expansion • Pre-emphasis Each of these functions are discussed in the following section. Audio Processor Illustration 4-2 Audio Processor Board 4.2.1... -
Page 44: Low-Pass Filter
This eighth-order, elliptical, switched-capacitor filter is located on the Stereo Generator board to take advantage of the Stereo Generator’s ground plane and close proximity to the 1.52 MHz clock. The output of the filter returns to the Audio Processor board. 4—4 FMX30/FMX100/FMX250 User’s Manual... -
Page 45: Stereo Generator
Rev. 1.0 4.3.2 Stereo Generator The 19 and 38–kHz subcarriers are digitally synthesized from a master 7.6 MHz crystal oscillator. The 1.52 MHz clock signal used by the low-pass filter is also derived from the 7.6 MHz master oscillator. Stereo signals are generated by a four-quadrant, analog multiplier. The output of multiplier is the product of 38 kHz applied to the “X”... -
Page 46: Rf Exciter Circuit Board
10 KHz and the 10.25 MHz clock to produce the 10 KHz reference signal. JP301 is a jumper option used only in transmitters which have been modified for operating in the Eastern Europe 66–73 MHz band. 4—6 FMX30/FMX100/FMX250 User’s Manual... -
Page 47: Metering Boards
Rev. 1.0 The frequency synthesizer also produces a lock signal. This signal is inverted and buffered to produce both lock and unlock status signals for use in other parts of the transmitter. An FSK signal (used for automatic identification of FM repeaters) shifts the frequencies of the 10.24–MHz crystal reference and the VCO. -
Page 48: Chassis
Red and green LEDs on the board indicate the presence or absence of program determined by the balance of the detected signals from the two filters. The time between a program fault and shutdown is selected by jumpering pins on header JP701. 4—8 FMX30/FMX100/FMX250 User’s Manual... - Page 49 Rev. 1.0 For delay times, see Table 4-1, Program Delay Settings. The times are proportional to the value of R721; times can be doubled by doubling the value of R721. JP701 Jumper Delay 3 and 4 2–minute 5 and 6 4–minute 7 and 8 8–minute...
- Page 50 The main energy-storage/filter capacitor, C1001, is located between the voltage and power regulator boards. The DC voltage across the capacitor will be 45–55 volts (FM30 and FM100) or 65–70 volts (FM250) when the carrier is on. 4—10 FMX30/FMX100/FMX250 User’s Manual...
- Page 51 Rev. 1.0 The RF low-pass filter/reflectometer are located in the right-hand compartment on the top of the chassis. A ninth-order, elliptic, low-pass filter attenuates harmonics generated in the power amplifier. The capacitors for the filter are circuit board pads. The reflectometer uses printed circuit board traces for micro-strip transmission lines.
- Page 52 The signal is buffered through U2B and finally reaches the output connectors P1 and P2, and on to the transmit circuitry. The receiver is powered from both on-board 9 volt and 5 volt supplies and the +12 and -12 volts from the motherboard. 4—12 FMX30/FMX100/FMX250 User’s Manual...
-
Page 53: Section 5-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 5—1... -
Page 54: Service
You may be required to leave a message at this number but your call will be returned promptly from our on-call technician. To obtain spare parts, call Crown Broadcast Sales at the following number. (866) 262-8917 You may also write to the following address: Service Manager International Radio and Electronics Company, Inc. - Page 55 It does not cover damage to loads or any ot her products or accessor ies r esulting fr om Crown Broadcast product fail ure. It does not cover defects or damage caused by use of unauthor ized modifications, accessories, parts, or service.
-
Page 56: Factory Service Instructions
We do not cover any charges for shippi ng outside t he 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:...
Need help?
Do you have a question about the FMX30 and is the answer not in the manual?
Questions and answers