Ice Radio Products

How to Conduct a Noise Audit of Your Telecommunications Facility

Achieving the best signal-to-noise ratio is essential for successful reception at any frequency or application. The stronger the signal and the lower the background noise, the better the performance.

While the strength of the received signal is often fixed—limited by the antenna and receiver—environmental noise is a variable that can be addressed. Environmental noise, common in modern setups, is typically wide-spectrum, amplitude-modulated (AM), and locally generated by sources like arcing power lines, computers, televisions, fax machines, and even heating systems. Though these noises don't travel far, they can significantly disrupt reception.

Many facility owners invest in expensive receivers but experience poor performance due to noise from their own equipment or nearby sources. Fortunately, tracking down these noise sources can be simple, cost-effective, and even enjoyable.

DIY Noise-Hunting Method:

1. Create a Sensing Antenna

   • Attach a PL259 or similar connector to 50 feet of RG58 coaxial cable.
   • On the other end, strip the shield, fray the ends, and connect an 18-inch wire to the center conductor (clip leads work well).

2. Set Up Your Receiver

   • Connect the coax to a receiver that operates in the 25-50 MHz range.
   • Select a clear channel and switch to AM mode.

3. Start the Hunt

   • Move around the house or facility with the sensing antenna.
   • Bring the antenna near appliances and devices to detect noise.
   • You’ll quickly discover how much noise computers, fax machines, and fluorescent lights generate.

💡 Pro Tip: Fluorescent lights are major noise offenders. If possible, eliminate them from your facility.

Fixing Noise Issues

• Install EMI Filters on AC power leads of computers and fax machines. This prevents noise from being transmitted via power lines.
• Use RFI Filters on telephone lines to block interference.
• Grounding and Shielding can further reduce noise.
• Power Line Noise: Report arcing power lines to your electric company. They often treat noise complaints as priority issues, as arcing causes power loss and fire hazards.

Taking noise reduction as seriously as antenna and receiver choices ensures optimal station performance. A little effort in noise auditing can greatly improve reception quality.