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Guest Message by DevFuse

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newbie question about coaxial

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3 replies to this topic

#1 OFFLINE   Jill73


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Posted 26 March 2009 - 07:55 AM

I always thought coaxial was one of the lower grade cables but the satellite connects to my ViP 622 receiver via coaxial. So is there "high def" coaxial?

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#2 OFFLINE   ChuckA


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Posted 26 March 2009 - 09:05 AM

There is no HD coax. Coax is simply a shielded wire that can carry many different types of signals. The signal carried on the wire determines the quality. There are several types of coax however. The "old" (existing) RG59 can still be used successfully for some runs but RG6 is usually better for any new installations.
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#3 OFFLINE   BattleZone


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Posted 26 March 2009 - 09:27 AM

The signal being sent from the satellite is not an analog video signal, but instead is digital data. Digital data passes over the coax without quality loss.

The signal from a set-top box to the TV's tuner is normally analog video modulated onto an analog TV channel, which must be tuned by the tuner in the TV. In most cases, the modulator itself is lower quality than the source, and the analog TV tuner further lowers quality. Bypassing the modulation/tuning by using the TV's line inputs definitely improves analog picture quality.

Note that with newer TVs with digital tuners, it is possible to send TV digitally. Digital OTA (ATSC format) and digital cable (QAM) are two methods for doing so. The problem is that ATSC doesn't provide for encryption, and QAM requires a set-top box for encryption. Plus, modulators for either type are extremely expensive and far more complicated than older, analog modulators.

#4 OFFLINE   harsh


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Posted 26 March 2009 - 09:47 AM

Most everything that you can get from any cable system travels over a single coaxial cable so it shouldn't surprise you that it is still being used.

DISH Network uses a bandwidth allocation scheme that can even incorporate over-the-air signals with all available channels on a single coaxial cable.

The key is efficient data compression.

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