WRG300 Weather Radio System - Crown Broadcast

WRG300Weather Radio SystemInnovative Technology for Public SafetyLong-Term ReliabilityAdvanced TechnologyNWR-SAME CompatibleSystem VersatilityModular Design24-Hour Support1-Year WarrantyRapid ResponseA Division ofInternational Radio & Electronics Corp.25166 Leer DrivePO Box 2000Elkhart, Indiana, USA 46515Phone: 866-262-8919Fax: 574-262-5399Email: tschwartz@irec1.comwww.crownbroadcast.comThe Crown WRG300 is a dual redundant transmittersystem manufactured for the National Weather Service.Crown designed the system to meet the rigors of broadcastingweather warnings for the National Oceanic andAtmospheric Administration (NOAA) weather radio network.The WRG300 consists of two 300 watt transmitters, aROAMS interface unit, remote monitoring and controlunit, a local control interface and an antenna system. Theen tire sy st em is de live re d pr e-wir ed a nd ins talled in astandard equipment cabinet.In its transmitter design, Crown packages the RF exciter,audio processing, metering, power amplifier, and low-passfilter into a single, compact chassis. This integrated approachprovides superior signal quality, ease-of-use, andunmatched reliability.Reliability is built into the system. Comprehensivemetering and control circuits protect and monitor thetransmitters through an Automatic Level Compensationwhich maintains constant transmitter output even withvariations in voltage, temperature, and VSWR. Tefloncircuit boards and copper heat spreaders in the RF chainmean less heat and longer life. A switching power supplyprovides maximum stability, flexibility, and reliability. Forremote monitoring, a summary of fault conditions and allmetered conditions is available at the rear panel.The WRG300 meets the requirements of solicitation No.50 -DG NW-8 -9 00 40.Call us!Call us today, visit our web page or send us e-mail for moreinformation about the Crown weather radio systems.

IOIO®F M BRO AD CAST T RA NSM IT T ERInnovative Technology for Public SafetyWRG300 Weather Radio SystemWR300 Transmitter SpecificationsTransmission mode: Narrowband FMRF frequency range: 162.400 to 162.550 MHz in25 kHz steps (12.5 kHz steps optional)RF deviation: ±5 kHzRF frequency stability: .0005%, -30 to +50 o CRF power: 100-375 watts adjustable, VSWR 3:1maximum with auto-foldback at higher reflected powerOutput impedance: 50 W unbalancedAudio frequency response:100 Hz–5 kHz, +1, -3dBAudio input: 600W balancedInput level: –20 dBm to +5 dBm for ±5 kHz deviationAudio distortion: Less than 1.0%FM hum and noise: Better than –40 dBAM noise: Better than –34 dBSpurious emission: Better than –74 dBTransmitter power consumption: 600 VA at 300 wattsMTBF: Better than 10,000 hoursWRG300 System SpecificationsContr ol and monitor ing: A ROAMS (Rem ote Off- AirMonitoring System) monitors and reports systemstatus. In addition, a microprocessor-based interfacecontrols the system and monitor s power output,VSWR, power amplifier voltage and current, audio inputlevel, devi ati on, pr im ar y AC vol tages and other cr iti calparameters. Fault sensing initiates automatic switchingof the transmitters.Computer for r emote operati on: Recommendedcomputer is a 133 MHz Pentium with 24 megabytes ofmemory, 50 megabytes of free hard disk space, and aserial port with a 16550 UART. The system operatesonly under Windows 95 or NT and requires a 19,200baud modem.Operating environment: Temperature (–30 o to +50 oC); humidity (0 to 95% at 20 o C, non-condensing);maximum altitude 15,000 feet.Cabinet size: 23.75 x 27.50 x 46.00 inchesPr imary power: Requires tw o, 120 or 240 volt accircuitsTelephone l ines: One leased-li ne for audio pr ogram,one dial-up line for monitoring and control. Touch tonetelephone required.Crown BroadcastLeased LineDial upCrown Broadcast is a business of International Radioand Electronics Corp., located in Elkhart, Indiana. Thebroadcast unit designs and manufactures FMtransmitters and RF amplifiers for radio broadcastmarkets and is the leading supplier of weather radiotransmitters for the National Weather Service.ROAMS andCrown Interface®WR300WR300F M BR OAD CAS T T R ANSM IT T ERFor more than 50 years, Crown Broadcast hastaken pride in its manufacture of innovative, highquality electronic prod ucts.CoaxialRFSwitchBandpassCavityAntennaWRG300 Weather Radio Transmitter System© 2001, IREC 25166 Leer Drive, P.O. Box 2000, Elkhart, IN 46515 Printed in U.S.A.