Information Station Specialists is the best known source of travelers information stations, highway advisory radio, advisory signs and services needed to reach motorists with public service information. Learn more about Information Station Specialists.
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ALERT AM Technical Specifications *
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Requires FCC license granted to local government or health agency (FCC Rules Part 90.242) or by NTIA (National Telecommunications and Information Administration) for federal government agency, or by US Military.
Transmitter (TR.6000 HQ 5.0)
  • FCC certified for Travelers' Information (TIS) radio applications (Certification B7MTR-6000TIS-WB).
  • Manufactured in the USA.
  • 0-10 watt operation, Class D, duel output devices.
  • Approved for military and federal agencies use on 510-530 kHz, 1610-1710 kHz - Certification J/F 12/07677.
  • Synthesized frequency selection.
  • Frequency stability +/-20 Hz.
  • Frequency range: 530 to 1710 kHz AM.
  • 5000 Hz audio bandwidth with limiting.
  • Power and audio control relays.
  • Internal monitor speaker with volume control.
  • 24V DC; power consumption 36 watts.
  • 19” rack mount, 1 RU.
NOAA Weather Radio Receiver with Specific Area Message Encoding (SAME) Decoder (Model WX.600l)
  • Receives all 7 National Oceanic and Atmospheric Association (NOAA) weather frequencies. (162.400 MHz-162.550 MHz).
  • Activates upon receipt of up to 53 EAS codes and 255 county codes.
  • Timed relays allow for automatic broadcast of watches, warnings, hazards and tests.
  • Receiver sensitivity: 0.4μV for 12 dB SINAD.
  • Stores most recent alert message (up to 4 minutes) in flash memory for local speaker replay.
  • 600-ohm continuous output, manual and auto-scan tuning; integral speaker / volume control.
  • External antenna, cut for the EAS/NWS weather radio frequencies and mount with threaded UHF connector, balun and weatherproof gasket.
  • 19” rack mount.
Wattmeter (SX.200)

See TechTalk's "Troubleshooting with a Wattmeter" article.
  • Analog.
  • Design:  passive, inline.
  • Insertion loss: 0.15 dB maximum.
  • Switch between forward and reflected power measurements.
  •  Metering:  5, 20 and 200 watt scales.
  • Peak envelope power and average power displays.
  • UHF/SO239 connectors for antenna and transmitter coax.
  • 50-ohm impedance.

AM Radio Antenna (ANXX)

See TechTalk article "Radio Antenna Siting."

  • Frequency range: 530-1710 kHz.
  • Center-loaded, vertical, whip.
  • Vertically polarized.
  • Omni directional (0-360).
  • Anodized aluminum finish.
  • Adjustable tip for precise tuning.
  • Power: up 100 Watts Carrier (1700 kHz) with 100% modulation. Less at lower frequencies and for modulation types that exceed 100% positive.
  • Radiation efficiency: 24 mV/m/km; Ref 1KW: (530 kHz) to 110 mV/m/km (1700 kHz). 30' tip height above ground on a 20’ metal support pole or tower with 25’ 32-element groundplane.
  • Bandwidth (3:1 SWR): 530 kHz: 5 kHz; 1710 kHz: 10.4 kHz.
  • Temperature endurance: -40°C. to 85°C.
  • Wind endurance: 80 miles per hour with ¼” of ice.
  • Overall assembled length: varies with frequency, i.e., 297” for 530 kHz, 129” for 1700 kHz.
  • Split-type mounts with stainless-steel hardware kit; masts, stands; lightning arrestors; enclosures.
  • RF exposure separation: 1-meter minimum recommended.
PowerPlane Preassembled Groundplane

See TechTalk article "Underground Power: Why Antenna Grounding Is Important, How It Works and Is Installed."
  • Radial elements: 32.
  • Element lengths: 10'.
  • Radial wires: 14 AWG, stranded copper (19-27 AWG strands per wire), insulated (black).
  • Pigtail: 4 AWG; high flexibility stranded copper (374-30 AWG strands), 5' length, insulated (black) with bare, soldered termination.
  • Deployment factory assembled. May be surface deployed or buried.
AC Uninterruptible Power Supply (UPS)  
  • 750VA 600W battery backup.
  • 6 outlets.
  • Interactive UPS offers voltage regulation and battery support plus complete AC surge suppression.
  • 2U rack mount.
  • Max load of 750VA for 4 minutes and a half-load of 375VA for 11 minutes.
  • Full-time pure sine wave output.
  • Maintains regulated 120V nominal output during brownouts and overvoltages from 83 to 147V.
  • Includes 6 UPS supported outlets.
  • Multi-function audible alarms and set of 5 front panel LEDs.
High capacity telephone line surge arrestor.
Digital Message Player  -  See "Compare Audio Control Methods."

     IP-Based Digital Audio Management System (TMS.020)

  • Browser-based (LAN/WAN) or local control program control.
  • Local message selection via front panel control.
  • File format: MP3, WAV, FLAAC, OGG; (64-128 kbps recommended).
  • network (RJ-45 Port).
  • Memory format: nonvolatile - no battery backup required.
  • Currently playing message displayed on front panel LCD.
  • Message loading via network upload or removable SD card.
  • Memory storage size 32GB minimum.
  • Message lengths: variable. Message playlists may be created and stored.
  • Message order: continuous sequential message play-out based on user-determined order.
  • Messages and playlists may also be triggered by HTML CGI commands.
  • Audio inputs and outputs: 600 ohms; RCA jacks; unbalanced.
  • Power: 120VAC/12VDC (2 watts); 150 ma @ 12VDC.
  • 19” rack mount format; 1 RU. Dimensions: 19” W X 1.75” H X 10” D.
     Telco-Based Digital Message Player (NX8R)

     See TechTalk article "How to Program Broadcasts on the NX8R Digital Message Player." 
  • Voicemail-style natural voice operation with 800-word / phrase capability; voice prompts and status report on available recording time, sequences, security codes, programming parameters and complete status of current audio program, relay states, power.
  • Identical remote and local control codes.
  • High quality (16-bit sampling rate) recording process, yielding 5500-Hz dynamic range.
  • One thousand independent broadcast messages that may be of any length. Each message may be independently monitored and later erased, as desired.
  • Automatic message scheduling by time, day, date. Internal time clock never requires setting, keeping time even with total loss of power.
  • Fifty message playlists that may contain hundreds of broadcast messages, commands for up to four external relays, other (nested) playlists and differing output levels for each audio output. Playlists may be created, recreated or appended locally or remotely.
  • Selection of active playlist locally or remotely.
  • Three hours of recordable time in dynamic flash memory.
  • Three audio inputs for separate and independent live program feeds, each with independent audio level controls.
  • Three audio outputs with audio levels settable locally, remotely or programmed to change automatically.
  • One- to nine-digit security access code, defeat-able phone prompting, programmable locally or remotely. User-settable number of retries and timeout period for maximum security.
  • Five-second and full-message survey monitoring of all stored messages and playlists.
  • Eight prioritized control closures to trigger message sequences remotely.
  • Control closure prioritization allows automatic interrupts for emergency messages and automatic National Weather Service all-hazard radio notifications (weather and EAS).
  • Includes prerecorded messages by professional announcer for advisory radio application -- ready for broadcast immediately.
  • Station identification message broadcasts every half-hour.
  • Rack mountable, slim design, 1 RU in height.
  • Optional two-way redundant control, which allows full control of the NX8R Digital Message Player via push-to-talk style transceivers (not included) in parallel with and having priority over telephone control. The two-way, redundant control option uses the same commands and protocols as telephone control, including the same voice prompts and control options.
Audio Recording Software
  • Adobe Audition
Broadcast Quality Audio Processor (HQ 5.2)
  • Front panel menu with job-wheel setup.
  • Performs AGC, 3-band compression, peak control and output filtering. Has user adjustments for compression, EQ, limiting and program density.
  • DSP limiting offers tight peak control without clipping.
  • USB connector enables fast firmware updates in the field.
  • Distortion: less than 0.02% THD (proof mode).
  • Noise: better than 72dB below the limited ceiling level measured through the appropriate de-emphasis network.
  • Program lines: input – active-balanced XLR analog, -20dBu-+20dBu; output – ative-balanced XLR analog, -15dBu-+12dBu.
  • Latency: 3.5 ms – 4.5 ms.
  • Power requirement: 12VDC at 200 ma.
  • Size and weight: 1.6” ”H x 5.5”W x 5.5”D (1U); 4 lbs.
  • Rack space required: 1RU (1/3 space).
Indoor Security Enclosure 
  • Durable black, textured power-coat finish.
  • Dimensions: 28.0" H x 22.5" W x 18.0" D.
  • Interior space for rack-mounted components:  21.0" H 15.0" D.
  • 200-pound equipment weight capacity.
  • Rack-mount equipment mounting format – 12 rack spaces.
  • 16-gauge steel construction with 1/8" thick laser-cut corner braces.
  • Tool-free quick-mount system for easy, one-person installation of the center section to the back pan on the job site.
  • Windowed front door provides access for control of electronics, key lockable.
  • Secondary service access door provides access to rear of electronic components and wiring. Service access door is key lock and padlock-able.
  • Seismic certified. EIA/TIA compliant.
  • UL listed in the US and Canada.
Associated Materials
  • All necessary wiring, cabling, connectors, mounts and hardware.
  • Illustrated instruction manual.
  • Test equipment: the above-listed wattmeter and a dummy load for antenna tuning and system diagnosis.
Commonly Selected Options
Headphones and Microphone for Recording or Live Broadcasting

  • Style: dynamic, handheld .
  • Frequency response: 50-15,000 Hz.
  • Pickup pattern: cardiod.
  • Output connectors: mic = USB and XLR; headphones = 3.5 mm jack.
  • Inclusions: desk stand, audio output cables.
  • Switch: on/off slide switch.


  • Frequency response: 18-22,000 Hz.
  • Design: closed back, foldable.
  • Earcups: padded.
  • Output cable: 3 meters; ¼” stereo connector with 1/8” adapter.

Signal Measurement Receiver  -  See "How SMR Works."

  • AM Receive Band: 520-1710 kHz; 10 kHz per channel.
  • Signal Intensity Display: 2-digit 15-99 (dbu).
  •  Tuning: Digital 10 khz LCD readout, lighted; auto/manual tuning; auto tuning storage.
  • Power: 3- AA batteries (included), 6 VDC input jack.
  • Audio Output: speaker, 3.5 mm headphone jack.
  • Dimensions: 5.3” X 3.4” X 1.0”.
  • Weight: 7.1 oz.
  • Instructions: manufacturer; ISS guidance sheets for the use of SMR Receiver for AM noise and signal monitoring.
Vertical Profile Antenna Support and Grounding System
  • Space requirement: less than 1 square foot.
  • RF exposure separation: 1 meter minimum recommended at fewer than 1000 watts - both occupational and controlled environments.
  • RF grounding element: 4-foot length; integral to support pole.
  • Lightning ground: 8-foot groundrod, copper clad.
  • Support pole composition: aluminum, 6" OD, .3125" wall thickness.
  • Support pole length: 24 feet.
  • Support pole finish: powder coat, silver/gray.
  • Support standing height: 18 feet above grade; 6 feet below grade.
  • Wind: hurricane rated. 1400-1700 kHz, support pole exceeds Florida Dade/Broward County windload requirements with attached antenna, greater than 146 MPH/3-second gusts. 530-1390 kHz, support pole meets and exceeds Florida windload requirements with attached antenna, 130 MPH/3-second gusts. (Florida Building Code – 2001).
  • Internal components: RF lightning arrestor, grounding bus, coaxial feedline:

    • Provided in a weatherproof NEMA4 cabinet, arrestor bonded to an aluminum panel that supports the lightning grounding and groundplane connection clamps.
    • Capacity of 50,000 amps surge.
    • Clamping speed of less than 2.5 nS.
    • 2 UHF connectors.
    • Aluminum flange ground connection.
    • External components: threaded attachment for antenna mount, weatherproof service hatch with tamperproof hardware. Crane hook.
      Frequencies: 530-1700 kHz.
    • Compliant with ANSI/TIA-222-G-2005 standard (Class III, Category 4, Exposure D) 130 mph/3-second gust for frequencies 1400-1700 kHz when installed in soil types per Annex F of the standard.
    • Maintains safe human RF exposure distance from the AM antenna, per FCC Guidelines (per ANSI/IEEE C95.1-1992 standard).
StreamCAST Electronics Package
  • Standalone IP audio encoder.
  • Supports MP3, PCM and VoIP (uLAw/aLaw) audio codecs.
  • Supports IP streaming standards such as TCP/IP, RTP, SIP, Shoutcast, Multicast.
  • Browser-based device management, SNMP Monitoring.
Required Utilities
  • 110-volt AC, single-phase/50/60 Hz, less than 1 amp AC operating current (20-amp breaker).
  • LAN/WAN network service.
  • Analog telephone line (POTS).
Commonly Supplied Services

Frequency Search and FCC Licensing

Electronics Installation
Onsite Training and FCC-Required Signal Study

Lifetime Remote Technical Support

InfoRadio Format Recordings

  * These specifications are subject to change without notice.
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PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Fax 616.772.2966, Email Form

The USA's go-to source for information radio station equipment, related products and technical services.

Trademarks: 2X Signal Booster, ALERT AM Emergency Advisory Radio System, ANXX AM Radio Antenna, AP.55 Digital Message Player, ENcast Emergency Notification Broadcast System, EventCAST Portable Information Radio Service, FAS.6000 Flashing Beacons & Controller, FASTrack Quick-Erect Sign, FlashCAST Internet Broadcast Service, Flashing ALERT Sign System, Free-Radiate On-Premise Radio Broadcast System, HearMoreInfo Internet Broadcasts, HPR.0990 High Performance Antenna, i A.M. Radio Transmitter, Information Station Specialists, InfoRadio Format, Information Station Classic, Information Station IP, Information Station USB, InfOSpot AM Radio Transmitter Station, InfOspot Drive-Thru AM Radio Station, IP.8 Digital Message Player, IP.76 Digital Message Player, ITS.6000 Highway Advisory Radio Network, MGR.021 Digital Audio Management System, LIGHTNING LED Changeable Message Sign, NX8R Digital Message Player, PowerPlane Preassembled Groundplane, RadioSAFE Wide Area Emergency Broadcast System, RadioSTAT Portable Emergency Advisory Radio Station, RE 2.5 Range Extender Outdoor Antenna and Tuner, RESPONDER 1 Portable Highway Advisory Radio System, RoadRunnR Portable Highway Advisory Radio System, SSD.20 Severe Storm Detector, Signal Measurement Radio Receiver, Stealth Sign, StreamCAST Internet Broadcast Service, SS.3000 Free-Standing AM Radio Antenna System with Tower, SX.200 Wattmeter, Talking House AM Radio Transmitter, TH.5 InfOspot Transmitter, TR.6000 Transmitter Model HQ 5.0, TMS.020 Digital Audio Management System, TR.6000 Transmitter Model 15.73, VoiceStar Portable Highway Advisory Radio Station (with or without Changeable Message Sign), VP.9000 Vertical Profile Antenna Support and Grounding System.

Information Radio Stations is a generic term synonymous with Travelers Information Stations (TIS), Highway Advisory Radio Stations (HAR) / Highway Information Systems & Low Power Radio Stations (LPR). Operation of the stations is governed by FCC Part 90.242 Rules. A FCC license is required. Information Radio Stations may be fixed or portable. Subcomponents may include transmitter, antenna and ground system, digital voice player, wateter, cabinet with conventional or Corbin locks, lightning arrestors for RF, power and telephone lines, coaxial cable. Most stations employ black maximized antennas to discourage ice accumulation and security measures to prevent unauthorized program access. Options include synchronization, battery backup, solar power, remote programming by local, network or telco, multi-station audio distribution via RF or LAN / WAN or wireless network