Air-Cooled FM Transmitter for Analog and Digital Standards

Transcription

1 Air-Cooled FM Transmitter for Analog and Digital Standards The Harris air-cooled FM solid-state transmitter family provides today s broadcaster with a single transmission platform capable of analog and digital operation. Incorporating field-proven Harris technology, transmitters deliver world-class performance, reliability and quality. is designed for low- and high-power requirements, up to 40 kw, while utilizing the most compact design on the market today. continues the legacy of the highly successful line of Harris FM transmitters and combines innovative, new quad-mode RF amplification and software-defined exciter technology to take FM transmission to the next level. Featuring Harris PowerSmart technology in its architecture, the line offers unmatched efficiency that makes it ideal for all FM applications. The 50-volt LDMOS device technology delivers a dramatic increase in power density, lower operating costs and reduced cost of ownership over the life of the transmitter. As the digital transmission leader, Harris has developed a solid core competency backed by years of experience in the complex technical areas that are essential for maximum transmitter performance. Customers can also count on Harris for implementation, and the company offers a range of support options from standard 24/7 telephone technical assistance and parts to installations, training, full system design and field maintenance contracts. FEATURES 1

2 Best-in-class power efficiency lowest operating costs Extremely high power density; compact and lightweight space-saving design Latest state-of-the-art LDMOS-FET power amplifier technology Quad-mode operation: FM, FM + HD Radio, HD Radio only or DRM+ Fully broadband modules, MHz requires no tuning or adjustments 1:1 power amplifier (PA) module to power supply (PS) redundancy Hot-pluggable RF amplifier modules and auto-ranging power supplies Proportional VSWR foldback for safe operation at reduced power into marginal loads (icy antenna, etc.) Automatic restart after AC mains interruption; returns to previous operational mode SNMP web-enabled remote graphic user interface (GUI) In-depth diagnostics via an easy-to-use front-panel control PRODUCT DETAILS The Advantage Maximum Efficiency is the most efficient solid-state FM transmitter available. Leveraging the Harris PowerSmart architecture, 50-volt LDMOS device technology delivers a dramatic increase in power density, lower operating costs and reduced cost of ownership over the life of the transmitter. Compact Footprint and Lightweight Design is the most compact FM transmitter on the market, with a significantly reduced size compared with other products in its power class. Ideally suited to fit in crowded, shared transmitter sites, reduces the cost and space required in the facility, simplifies installation, lowers shipping costs and allows for easier maintenance. Highest Power Elegant Simplicity achieves market-leading power levels (up to 40 kw). Featuring distributed control architecture, delivers outstanding reliability, and enables soft failure operation and simple serviceability. Low to High Power, Analog or Digital From very low power (5 W) to very high power (40 kw and beyond), the family does it all. Whether it is 50 W of analog FM or 40 kw of 2

3 FM+HD that is needed, transmitters all provide the same outstanding value. Improved Up Time Hot-pluggable, redundant power amplifier (PA) and universal power supply (PS) modules make on-air servicing a breeze and eliminate costly service interruptions. Reduced Service Costs Lightweight and universal PA modules (broadband from 88 to 108 MHz; 4.5 kg) and PS modules (auto-ranging 90 to 264 VAC, 47 to 63 Hz; 2.5 kg) facilitate overnight/same-day shipment from a centralized depot for simplified and cost-effective spares holding. The use of lightweight modules virtually eliminates two-person lift requirements for routine maintenance. also supports the simple replacement of pre-tuned amplifier pallets in the field, eliminating the need for complex tuning after FET replacement. Smooth Upgradeability features world-class software-defined exciter technology, allowing for a seamless transition from analog to digital in the user s time frame. Advanced Digital Precorrection Harris Real-Time Adaptive Correction (RTAC ) is an advanced type of digital precorrection that enables the exciter to more fully utilize the transmitter power amplifier, yet maintain spectral mask compliance of the digital signal. Reliable, Distributed System Control The transmitter uses a central interface to a distributed control system. Featuring extensive protection and control capabilities, the main system control is located in the amplifier bay and communicates with the exciter for mode switching. The distributed nature of the design provides for fast-acting independent protection at the module level for maximum reliability. A liquid-crystal control screen allows easy review of all operational parameters and easy diagnosis of any potential equipment problems. Front-panel buttons and bright LED indicators allow for simple control and feedback on all the key operating parameters. The navigation buttons allow for quick review, setup and recall of all menus via the front-panel screen. By simply connecting a PC to either the front- or rear-panel RF-45 jack, the user can monitor and control all the settings on the PC. Advanced Global Monitoring and Control In addition to local control, the transmitter can be controlled from anywhere in the world with an intuitive, browser-based graphical user interface (GUI) over TCP/IP via a telecom or network connection with password protection. Full Simple Network Management Protocol (SNMP) facilities are provided for network management of the entire transmission system using industry-standard MIB protocols. 3

4 Remote Communication The following remote interfaces are available: GUI Ethernet network connection RJ-45 (10/100Base-T) with TCP/IP protocol Automated remote alarms in the event of a fault, which are sent via SNMP or with the connection to a network Simple, parallel interface to panels and remote control systems Multi-System Controller (MSC) To support greater redundancy, the Multi-System Controller (MSC) supports a range of backup options, including 1+1, full N+1 and dual-transmitter installations. The MSC monitors and controls the transmitter systems and controls RF switching. Common Parts The complete line utilizes the same major parts from the highest-power, air-cooled transmitter to the compact, low-power systems. Advanced Digital Pre-Correction There are two types of precorrection used: linear and nonlinear. Linear precorrection is for the non-ideal amplitude response and time response of the transmission system, including the power amplifier and any bandpass filters. Linear precorrection is helpful in optimizing the modulation performance of the transmitted digital signal so that less equalization is required at the receiver. Nonlinear precorrection is for the two major types of nonlinearity (AM->AM and AM->PM) in the RF power amplifier, which cause undesired spectral components and poor RF mask compliance. AM to AM nonlinearity causes the RF power amplifier s output amplitude to not accurately track the input amplitude. Typically, this nonlinearity occurs near the peak output power of the amplifier, where saturation effects cause the output response to flatten as the input continues to increase and where the amplifier output goes to zero. AM to PM nonlinearity causes the RF power amplifier s output phase to not track the input phase. The amplifier acts like a phase modulator as the power output varies to follow the input signal, producing undesirable sidebands. Precorrection can be implemented in many ways. In order of sophistication, they are: Analog fixed precorrection Digital fixed precorrection Digital adaptive precorrection Digital, memoryful, adaptive precorrection (RTAC) Fixed precorrection can improve the system linearity for one specific operating point, but must be manually readjusted for changes in power output, antenna load impedance, temperature or operating point. Adaptive digital precorrection utilizes an RF sample taken at the output of the RF amplifier to automatically adjust the shape of the precorrection to continuously optimize the linearization of the system. The bandwidth limitation, especially in tube-type amplifiers (e.g., IOT), along with the stored energy in tuned circuits, introduces memory effects. Digital, adaptive, memoryful precorrection can correct for these memory effects in addition to simple AM to AM and AM to PM distortions. Even wideband, solid-state RF amplifiers have some memory effects that make the shape of the nonlinearities change with the digital modulation data states. As the only system with simultaneous linear and nonlinear, adaptive and memoryful precorrection, RTAC 4

5 provides the highest level of correction to all types of RF amplifiers. 5

6 IMAGES/DIAGRAMS Configuration Each transmitter combines an FM exciter and one or more amplifier bays each with various configurations of PA modules to achieve the rated power. The amplifier bays contain several major systems: Power Amplifier Module This hot-pluggable module features a pair of broadband ( MHz) RF PAs that require no user adjustments. The PA modules are identical and fully interchangeable in each transmitter. Each amplifier can be re-biased on-the-fly for operation in FM, FM + HD Radio and HD Radio only, or DRM+ mode. Power Supply Module This hot-pluggable module is a 2400 W 48 V PS with a.98 power factor and mains input range of V. The PS interface provides on/off functionality to the power supplies, a fan tachometer alarm and redundant feed to the cooling system. Each module also has +5 V output to redundantly drive the low-voltage control circuits and 1:1 power supply to power amplifier redundancy. Each 48 V power supply s output is also fed to the dual IPA for maximum redundancy. 6

7 Cooling System The air cooling system includes internal redundant fans that pull cool air from the front through a removable filter, allowing exhaust to exit through the rear of the transmitter. Systems integrated in Harris cabinets feature top exhaust to support ducting and, optionally, can have ducted air input plenum to permit top, bottom or rear air input. Control System Featuring extensive protection and control capabilities, the main system control is located in the amplifier bay and communicates with the exciter for mode switching. Each PA module has dedicated control and monitoring to support on/off functionality and alarms for reflected power, temperature and current overloads. The control systems also provide for remote access via a parallel, SNMP and Web-enabled GUI. SPECIFICATIONS Specifications and designs are subject to change without notice. General Frequency Range Operating Modes 87.5 to 108 MHz Quad-Mode on-the-fly switching between FM HD only, FM+HD or DRM+ Power Output Model Analog FM FM+HD HD Only Power W -20 dbc Power W -14 dbc Power W -10 dbc Power W -20 dbc Power W -14 dbc Power W -10 dbc Power W FAX50 1 to FAX to FAX to FAX to FAX1K 100 to

8 FAX2K 200 to FAX3K 300 to FAX3.5K 350 to FAX5K 500 to FAX10K 1000 to FAX20K 2000 to RF Output Connector FAX50/150/300/500: Type N female, 50 ohms FAX1K/2K/3K: DIN 7-16 male or EIA 1-5/8 unflanged, 50 ohms FAX5K/10K: EIA 1-5/8 unflanged, 50 ohms FAX20K: EIA 3-1/8 flanged, 50 ohms AC Mains Requirement FAX50: 90 to 264 VAC single phase, 47 to 63 Hz FAX150: 90 to 264 VAC single phase, 47 to 63 Hz FAX500: 90 to 264 VAC single phase, 47 to 63 Hz FAX500: 90 to 264 VAC single phase, 47 to 63 Hz FAX1K: 90 to 264 VAC single phase, 47 to 63 Hz FAX2K: 190 to 264 VAC single phase, 47 to 63 Hz FAX3K: 190 to 264 VAC, single phase, 47 to 63 Hz Three-phase available as option on FAX2K and FAX3K Configurable on-site for single- or three-phase connection FAX5K: 190 to 264 VAC, 47 to 63 Hz single phase or 3 phase, field configurable FAX10K: 190 to 264 VAC, 47 to 63 Hz single phase or 3 phase, field configurable FAX20K: 190 to 264 VAC, 47 to 63 Hz single phase or 3 phase, field configurable 200 to 264 VAC single phase, 200 to 264 VAC delta, 200 to 264 VAC wye, or 350 to 450 VAC wye Will continue to operate at reduced power on loss of 1 or 2 phases Power Efficiency and Consumption (Typical, at nameplate power level, in FM only mode) FAX50: 24% 208 W FAX150: 50% 300 W FAX500: 64% 780 W FAX1K: 64% 1,563 W FAX2K: 66% 3,030 W FAX3K: 67% 4,478 W FAX5K: 68% 7,308 W FAX10K: 70% 14,000 W FAX20K: 70% 28,000 W 8

9 Power Factor (displacement) 0.98 typical Power Stability ±0.25 db Asynchronous AM S/N Ratio 55 db minimum below equivalent 100% amplitude modulation by 400 Hz using 75 μs de-emphasis Synchronous AM S/N Ratio 50 db minimum below equivalent 100% amplitude modulation with 75 μs de-emphasis and 400 Hz high-pass filter (FM deviation ±75 khz by a 1 khz sine wave). Measured at wideband input RF Harmonic and Spurious Suppression Internal harmonic filter meets or exceeds all FCC, CCIR and ITU requirements VSWR Protected against open or short circuit, all phase angles. Capable of operation into infinite VSWR with user-adjustable foldback threshold. Factory preset to 4% of nominal nameplate power (VSWR = 1.5:1) Environmental Altitude Ambient Temperature Range Humidity 15,000 ft (4,573 M) elevation above sea level 32 to 122 F (0 to 50 C), full performance at sea level, upper limit de-rated 35.6 F (2 C) per 1000 ft. (300 m) elevation AMSL. Maximum power de-rated 5% 113 to 122 F (45 to 50 C) 95%, non-condensing Mechanical Dimensions Dimensions Standard EIA rack 19 in. (48.3 cm); 1RU = 4.45 cm FAX50: 2RU 12 in. (30.5 cm) depth FAX150/300/500: 2RU 23.5 in. (60 cm) depth FAX1K: 3RU, 23.5 in. (60 cm) depth FAX2K/3K: 5RU, 23.5 in. (60 cm) depth FAX5K/10K: 16RU, 42 in. (107 cm) depth FAX20K: 44RU, 46 in. (117 cm) depth Weight (approximate, all modules installed) FAX50 12 lbs (5.5 kg) FAX150: 19 lbs (8.6 kg) FAX300: 22 lbs (10 kg) FAX500: 24 lbs (11 kg) FAX1K: 35 lbs (16 kg) FAX2K: 49 lbs (22 kg) FAX3K: 63 lbs (28.90 kg) FAX5K: 110 lbs (50 kg) FAX10K: 160 lbs (73 kg) 9

10 FAX20K: 370 lbs (145 kg) Remote Control Parallel DB37-female, GPIO, Relay contacts: VDC, Digital Inputs (TTL level) Front & rear RJ-45 connectors Ethernet/IP provide Web Interface Allows full control and monitoring of all parameters via Web browser SNMP SNMP compliant with IRT TC-MIB-configurable alarms Exciter/Modulator An internal FM modulator is integrated into the FAX low-power series transmitters. (FAX150/ /FAX3K) FAX5K, FAX10K and FAX20K have an optional internal modulator or can be driven from an external exciter. Data below is with the FAX internal modulator Digital modulations such as HD Radio General Modulation Type FM Modulation Capability FM digitally synthesized direct to channel in 10 khz increments Greater than ±300 khz Frequency Stability ±150 Hz, 32 to 122 F (0 to 50 C) using high-accuracy internal TCXO. 10 MHz input for synchronization to external (GPS) reference. Automatic switching to internal oscillator if external reference fails. Meets or exceeds standard NRSC-5A emission limits in all modes FM Modulation Capability Modulation Indication Greater than ±300 khz Auto-ranging (14%/140% full scale) GUI modulation display with peak hold. Web Internal Composite Peak Limiter N+1 Control Serial/IP control of 8 presets of frequency, input, mode and output power Input/Output AES3 Audio Inputs Analog L/R Inputs Analog Composite Input 2 auto-switching AES3 inputs, female XLR, 110 ohms balanced; -2.8 dbfs nominal; GUI adjustable level from 0 dbfs to -15 dbfs in 0.1 db steps for ±75 khz deviation; input sample rate 32 to 96 khz Female XLR, >10K ohms, balanced, resistive; default level is +10 dbu for ±75 khz deviation Level GUI adjustable from -10 dbv to +10 dbv 2 BNC inputs (1 balanced, 1 unbalanced); balanced impedance is 10 K ohms or 50 ohms (selectable); unbalanced is 10 K ohms 10

11 Input Level External SCA Inputs External 10MHz Clock Input External 1 PPS Clock Input RF Sample Out 3.5 V pk-pk for ±75 khz deviation; adjustable 2 to 5 V pk-pk 2 BNC female, unbalanced; >10 K ohms; 1.5 V pk-pk nominal for ±7.5 khz (10%) deviation of main carrier; adjustable from 1 to 4 V pk-pk BNC female, unbalanced, 50 ohms, -10 dbm to +10 dbm BNC female, unbalanced, 50 ohms, TTL level BNC jack 2, front- and rear-panel -40 dbc, post harmonic filter front panel 19 khz Pilot Sync Output BNC female, unbalanced, 50 ohms resistive, sinewave, phase adjustable, AC coupled, 4.5 V pk-pk nominal, unterminated Ethernet Ports USB Port 2 RJ-45 on main processor board; 2 RJ-45 on Exgine board (HD version only); all Ethernet ports 10/100; supports static or dynamic IP address Front-panel USB type-a connector; USB 1.1/2.0 compliant; supports configuration save/restore and software updates via flash drive Wideband Analog Input Performance FM Signal-to-Noise Ratio Amplitude Response Total Harmonic Distortion Intermodulation Distortion Transient Intermodulation Distortion (DIM) Slew Rate Phase Response Variation Group Delay Variation 86 db below ±75 khz deviation at 400 Hz; measured in a 10 Hz to 100 khz bandwidth with 75 s de-emphasis; DIN "A" weighting ±0.01 db 20 Hz to 53 khz; ±0.03 db, 53 khz to 100 khz.01% THD over stereo sub band (10 Hz to 53 khz) with 75 microsecond de-emphasis CCIF: 0.005% (14/15 khz, ratio 1:1); SMPTE: 0.005% (60/7000 Hz, Ratio 1:1) 0.005% (2.96 khz square wave/14 khz sinewave modulation) 11.8 V/us - symmetrical ±0.05 from linear phase, 10 Hz to 100 khz ±5 ns, 10 Hz to 53 khz, ±30 ns, 53 to 100 khz Stereo Generator Performance (AES3 or Analog Inputs) Modes Pre-emphasis Stereo Pilot Tone Stereo Separation Dynamic Stereo Separation Stereo Amplitude Response Stereo Signal to Noise Ratio (L or R) Stereo Total Harmonic Distortion Stereo, Mono L+R, Mono L, and Mono R; remote controllable Selectable 0, 25, 50, or 75 microseconds 19 khz ±0.03 Hz; injection adjustable 0% to 12% in 0.05% steps; Nominal: 9%. 38 khz, 57 khz, 76 khz, 95 khz suppression: 80 db below ±75 khz deviation 60 db, 10 Hz to 15 khz 60 db, 10 Hz to 15 khz* ±0.1 db, 10 Hz to 15 khz referenced to selected pre-emphasis curve, LPF cutoff selectable 85 db below 100% modulation at 400 Hz; measured in a 10 Hz to 22 khz bandwidth with 75 μs de-emphasis and DIN A weighting 0.02%, any modulating frequency 10 Hz to 15 khz, in bandwidth 10 Hz to 11

12 22 khz with 75 μs de-emphasis Stereo Intermodulation Distortion (L or R) CCIF: 0.02% Note 1; (14/15 khz 1:1), SMPTE: 0.02% (60 and 7000 Hz 1:1) Transient Intermodulation Distortion (DIM) Linear Crosstalk Nonlinear Crosstalk Audio Overshoot 0.02%; (2.96 khz square wave/14 khz sinewave modulation) 90 db below 100% modulation reference (AES3 input); L+R to L-R or L-R to L+R due to amplitude and phase matching of L&R channels (10 Hz-15 khz) 80 db below 100% modulation reference; L+R to L-R or L-R to L+R due to distortion products Less than 0.16 db Mono Performance (AES3 or analog input) Pre-emphasis FM Mono Signal-to-Noise Ratio Amplitude Response Mono Total Harmonic Distortion Selectable 0, 25, 50 or 75 microseconds 86 db below 100% modulation at 400 Hz; measured in a 10 Hz to 22 khz bandwidth with 75 μs de-emphasis and DIN A weighting ±0.05 db, referenced to selected pre-emphasis curve (no low-pass filter) 0.01% THD, 10 Hz to 22 khz bandwidth Mono Intermodulation Distortion CCIF: 0.005% (14/15 khz 1:1); SMPTE: 0.005% (60/7000 Hz 1:1) Mono Transient Intermodulation Distortion (DIM) 0.005% (2.96 khz square wave/14 khz sinewave) External SCA, RBDS Performance SCA Format SCA Sub-band Amplitude Response SCA Channel FM Signal-to-Noise Ratio Harmonic Distortion Intermodulation Distortion Crosstalk, SCA to Stereo Crosstalk, Stereo to SCA Crosstalk, SCA to SCA Externally generated, analog FM subcarriers in the range khz ±0.5dB, 40 to 100 khz; high-pass filtered 80 db below +6 khz subcarrier deviation at 400 Hz with 150 μs de-emphasis less than 0.2% in audio pass-band of SCA generator SMPTE (60 and 7000 Hz, 1:1): 0.2% or less, no pre/de -emphasis, SCA generator low-pass filter bypassed 80 db below 100% modulation, L or R channel with 75 μs de-emphasis 80 db below 100% modulation referenced to ±6 khz deviation and 150 μs de-emphasis 80 db below 100% modulation (referenced to +6 khz deviation and 150 μs de-emphasis per channel) Compliance RoHS 2002/95/EC, FCC, EC, IC, ITU, SARFT Compliant: Yes R&TTE 1999/5/EC Compliant: Yes 12

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