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Home Page - Digital TV - Digital Television Troubleshooting Digital Television Troubleshooting GuideDTV Reception Guide (3)
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A Quick Guide to Home Theater Design
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Last Update: 26th June 2009 |
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Digital TV TroubleshootingWe have already covered a good deal of information on Digital TV reception. Still, there may be a few points worth considering when it comes to troubleshooting problems that may arise in the process. Antenna Repositioning and PointingA significant improvement in the received signal level and quality can often be achieved by repositioning the outside digital television antenna, either by using a longer pole or by moving the mounting point to a different location on the roof. If you are using an already existing antenna - originally used for the reception of analog TV, this may need to be realigned to pick up the new DTV services as further detailed in this article below. 1. Replacement TV AntennasBecause of the channel re-allocation associated with the digital television transition process, some DTV signals may be out of group from the existing analog channels. If this is the case, than you will require a different group antenna. In this case, always ensure that you get a CEA certified TV antenna. Sometimes, a higher gain antenna may be necessary. In DTV overlap areas where the same digital television broadcast channel is used on two different transmitters, it may be necessary to use a highly directional antenna.
2. Cables and ConnectionsThe use of high-quality UL-rated dual- or
quad-screened RG-6 coaxial cable such as the
Monster Quad-shield RG-6 UL-approved 75-ohm coaxial cable Furthermore, downleads should run as directly as possible from the DTV antenna to the tuner; minimize the number of splices - these increase signal loss. Also, avoid sharp bends in the cable as these can impair performance.
Finally, all outdoor antenna installations - including cables and connections, should be regularly checked for deterioration due to the elements, and for corrosion at connection points. 3. Use of amplificationIn case of insufficient signal strength, it may be necessary to use amplification in the form of a masthead amplifier, either as a separate add-on unit, or integrated as part of an active DTV antenna. We have already touched upon the subject of amplification in our digital television antenna guide. Keep in mind however the limited extent to which reception can be improved in this way - in particular because amplification increases not only the DTV signal level but also noise and interference signals. In other words, the use of amplification is recommended only as long as you can receive a good quality DTV signal. Good quality does not imply a strong signal level, but one that is free from noise and interference. This means that amplification is there to amplify a weak signal but not to restore poor quality reception. This 'signal quality - signal level' issue is an extremely important aspect in the reception of digital television. Important: TV Antenna Return Policy and Technical SupportAlways ensure that you get a good return policy when purchasing TV antennas and related gear. This applies irrespective of whether you buy on-line or direct from a brick and mortar store. Equally important is good technical support from your DTV antenna supplier; similarly, this applies for any related RF amplification gear. This in view that digital television reception is highly dependent on local conditions; therefore, what may apply under normal conditions, need not necessarily apply in your case. Useful Digital Television ResourcesGovernment organizations and other interested parties have set up various websites with the scope of helping the end consumer throughout the digital TV transition process. We have already mentioned a few in our discussion; here is our full suggested list:
Video Tutorial appears courtesy of Best Buy |
Articles under this section
DTV Basics: What is Digital Television? Reception of DTV (1): Converter Boxes and DTV Coupons Reception of DTV (2): DTV Antennas
Recommended Technical Guides The Complete LCD TV Guide:
Plasma Television
Guide to
Digital Satellite TV
The HDMI Cable Guide TV Viewing Distance Should You Opt for a 1080p
HDTV? Home Theater
Design:
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