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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Information Radio Station Maintenance
Make sure your station is operating correctly.
Aurora Illinois Station Equipment

Related Links

Maintenance Checklist to Print - pdf

Operators' Zone Webpage

Technical Services Webpage
Regular Checks

Monitor the station’s broadcast in your vehicle. Determine that the range of your radio station continues to be what it was when installed. Take care to monitor the station on the same radio in the same vehicle at the same physical locations to make that judgment, since radio sensitivity, signal coverage and vehicle interference levels vary widely. If these areas shift closer to the station, continue with the checks listed below.

Quantify your station's signal levels by documenting them with a SMR Receiver (provided with modern stations) at specific receiving locations. If the signal level value changes significantly on the receiver, then you know that your signal level output has changed. (Note: A SMR Receiver is available as an accessory item. See details here. NOTE: Due to their relatively low power, Information Radio Stations can be disproportionately affected by nighttime skywave interference, present after dark on some frequencies. Such stations will appear to have much lower range at night. See Skywave TechTalk article.

How does the audio sound? Pay attention to the messages themselves. How's the modulation (or level of the audio) in the broadcast? If your message is faint, soft or difficult to hear even when you are within a mile of the antenna, the transmitter’s audio input may need some adjusting upward. If it sounds loud but distorted, the audio level may need adjustment downward.

Adjusting modulation:  Adjust the control on the right side, labeled "Audio/Audio Level." The associated LEDs, once adjusted, should show the audio level peaking in the yellow and occasionally red.

Check the wattmeter to determine the health of your transmitter and antenna. On the wattmeter, forward power should be recorded and should be 10 times the reflected power on the meter. Call 616.772.2300 or email us for assistance in taking the meter readings. See more about the wattmeter here.

Annual Checks

If your station has batteries, test each battery individually with a volt-ohm meter set to measure DC voltage. Your batteries had standing voltages of about 12.8 volts when new. If healthy, they will show a charge greater than 12 volts when tested. Replace promptly batteries that do not meet this test, or system operation and message integrity might be compromised.

Is there physical damage to the system or lightning damage to the antenna and other external components? Look for dark marks or other obvious damage or blown fuses, cables or wires that might have become damaged, loose or corroded at connection points.

License renewal. Do you know when your FCC license expires? We can help you determine the expiration date.

 Do you know when your FCC license expires? We can help you determine the expiration date.

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PO Box 51, Zeeland, Michigan, USA, 49464-0051, Phone 616.772.2300, Fax 616.772.2966, Email Form

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Information Radio Station is a generic term synonymous with Travelers Information Station (TIS), Highway Advisory Radio (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, wattmeter, 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.

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