Why Is My Cable TV Fuzzy?by Anthony Oster
A distorted, pixelated or fuzzy cable TV image can be the result of numerous issues, ranging from the condition of your home's cable wiring to the type of cable service you subscribe to. While your cable service may experience occasional problems with distortion due to inclement weather or other situations impacting the service area, long-term distortion may be the result of your home's wiring. Identifying and alleviating the fuzzy image on your TV can range in complexity from tasks such as tightening connections or restarting your cable box, to replacing the coaxial cable in your home to accommodate the type of service that you use. Your first step should be to check multiple channels on your TV and call your cable provider to determine if the distortion is limited to a group of channels or if it is due to technical difficulties beyond your control.
A loose connection is one of the most common reasons for a fuzzy or snowy cable TV picture. Locate and firmly tighten each cable connection between your TV, cable boxes and coaxial cable wall outlets. Inspect each cable for tears, rips or frays and replace cable as needed. Because cable wires typically are installed in numerous rooms throughout a home, a loose connection at a cable splitter, likely located in your attic or basement, can also cause distortion.
Interference From Other Devices
The electromagnetic signal given off by devices such as video game systems, home theater receivers and DVD or Blu-ray disc players can cause interference on your cable TV. Placing these types of devices within close proximity to one another can result in image distortion, including a fuzzy or repeating image. If it is not possible to move the physical location of your devices due to the design or placement of your furniture, or the layout of the room, replace your audio and video cables with specially-shielded models designed to minimize interference from other sources.
Cable Splitters and Amplifiers
Your home is connected to the cable company's local hub through a single coaxial cable that is then split and branched off to multiple rooms in a home. Each time a cable line is split, the signal strength of the resulting available cable lines is reduced. A fuzzy picture can be the result of poor signal strength due to over-splitting. One method to combat over-splitting is to rewire your home, using as few splitters as possible to wire each room in your house. You can also use a signal amplifier to increase the signal strength along one line of cable -- but note that the use of multiple amplifiers may be counter-productive and result in signal interference.
As high-definition televisions (HDTVs) become more affordable and more commonplace than standard-definition models, many consumers are upgrading their cable service without upgrading the wiring in their homes to support these HDTVs. The frequency range for analog coaxial cable, cable splitters and amplifiers operate at a range of 50 MHz to 800 MHz, while digital cable services operate on frequencies up to 1 GHz. Updating the wiring, splitters and amplifiers in your home with HD components designed to sustain the expanded frequency-range utilized by HD and digital cable can also alleviate a fuzzy or distorted display.
- link BroadbandInfo.com: Cable Modem Splitter and Do-IT Yourself Cable Installation FAQ
- link CableTVAmps.com: Education
- link TV Splitter Amplifier: Coaxial Cable Types
- link TV Splitter Amplifier: Type of TV Amplifiers
- link Arlon Materials for Electronics: Everything You Ever Wanted to Know About Laminates for Frequency Dependent Applications but Were Afraid to Ask
- link Sydney Morning Herald: Tricks to Fix Pixelation
- photo_camera Agri Press/Lifesize/Getty Images