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In Reply to: How does dB apply to a cable amplifier????? posted by Bruce Righter on October 29, 2001 at 16:31:04:
Assuming your cable signal arrives at your home at a 0db point, each spltter will drop this signal by Xdb amount. Average splitters will lower the signal 3db on each new connection. As you can see this will add up fast. As you lower the signal you lower the potential quality of picture at each tv. Amplifiers are used to boost the signal up to a point where you can split it up and not end up with poor pictures at each tv. You would be smart to check with your cable provider and see if they supply amps. They do in our area, (Cox Cable). The amps are not costly and should a problem arrise down the road they will not be pointing at your 3rd party amp as the suspect since they may not support it, and in a lot of cases they would even replace a faulty amp if it was bad, if it was the make and model they supply.
Follow Ups:
Jim,
Thanks. But I still am unclear why "dB" is the correct term here. I've always seen "dB" used to express loudness, so the description of 3dB splitter loss makes it seem like it's losing volume (rather than quality of signal).The practical solution is just to try a Radio Shack amp (with their 30 day return policy) and see if it works, but I was/ am still interested in the terminology.
Thanks again for the input,
Bruce
Hi BruceI recall from my days in telecoms that a loss 3db represents half power. So if you cable gives a loss of 3db over 100ft (for example), you will have half the power you started with.
DB is just a measure of power and need not only apply to sound.
Regards
mark
Mark is correct, (I am in telecom). The term db is a measure of power, and this "power" can be an anlaog signal either video or audio, and also applies to digital signals with video or audio content.
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