On February 14, 2006 at 10:53, barlow said...
I realise that SAT is digital and that analog
Cable is NTSC compatible.
None of this explains to me why the signal sources
that Time Warner cable gets from OTA antennas,
download from satellite which could be on different
transponders, or land line links from affiliates
are combined at the Time Warner Cable facility
and than are sent along on one coax line where
paying consumers can receive the NTSC analog signal
on any NTSC tuner equipted TV in their house.
Bottom line is how does Time Warner cable merge
all these varied signal sources into one coax
line ?
Is it just a matter of dollars and it costs a
lot of money to combine all these signals and
put them out on analog NTSC coax?
-Don B
The answer to your question is Time Warner has a receiver for each channel and a modulator to convert the video and audio from that receiver to an RF channel that your TV set can receive. After the modulators they use signal combiners to combine the signal and then send it to a launch amplifier.
The signals sent by DirecTV and Dish are not modulated RF channels. That is why you need a receiver to convert the satellite signals and NTSC signal.
Hope this helps.
Dave T.
