motorola870
join:2008-12-07
Arlington, TX
| What does a cable noise tracker do for a cable system?
here is what i get on channel 122 with cable directly plugged into my tv. and on 120 i get a analog test pattern. so what is the purpose of channel 122? |
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gar187er
Premium Alcoholic
join:2006-06-24
Dover, DE | you get snow....interesting....lol |
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motorola870
join:2008-12-07
Arlington, TX | it is not regular snow it has a cable sweep moniter on the carrier.
it has no digital channels and 123 above it has 12 SD channels |
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gar187er
Premium Alcoholic
join:2006-06-24
Dover, DE | reply to motorola870
ok, so they use that empty channel for sweeping...in a system here the sweep generator is on a regular channel, as there is no empty space for it....they have to go turn it on/off and a hub site when they want to sweep... |
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cypherstream
Looking forward to the future of things.
Premium,MVM
join:2004-12-02
Reading, PA
clubs: | reply to motorola870
Is it a CW carrier (Continuous Wave), or digitally modulated 64QAM / 256QAM ? Obviously it's not NTSC Analog as all you see is snow. |
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motorola870
join:2008-12-07
Arlington, TX
| continuous wave as my tv does not detect a digital signal. when i type 122-1 it does not even go to 122-1 it just stays on the current channel.
what is wierd is I also have:
94 test 256qam blank carrier
100 test 256qam blank carrier
121 test 256qam blank carrier
125 test 256qam blank carrier
it used to be on channel 94 when my cable system was 750MHz then it was moved to 116 then where it is today. |
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SpHeRe31459
join:2002-10-09
Sacramento, CA | So now I'm curious what does the test do (what function does it serve) for the cable company? |
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cablec0p
@rcn.com
| said by SpHeRe31459  :So now I'm curious what does the test do (what function does it serve) for the cable company? it does exactly as it sounds..tracks noise...say there is noise on the line, when techs think they fixed it they can tune to that channel to see if noise is gone. fixing = repairing damaged cables, disconnecting a noisy drop to a house, replacing taps, etc. |
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SpHeRe31459
join:2002-10-09
Sacramento, CA | Oh duh! right. |
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