Digital
cable channels are compressed and several digital cable channels can
take the place of a single analog channel. So the "number" of a digital
channel is meaningless when talking about analog channels. They are
simply made up and assigned by the cable company. The cable box sorts
it out and makes it work just like a numbered analog channel for you.
As a result, it is impossible to tell what analog channels are
available simply by looking at your "channel lineup" card. The only way
to tell what analog channels are in use (and thus what frequencies) is
to contact your cable provider, or someone else that you are positive is on the exact same cable system.
In a pinch, experimentation with a modulator may find the unused
channels. But if several digital channels go away when the modulator is
on, those digital channels must be on the analog channel (or one above
or below) that the modulator is set to.
Digital cable often also makes low-pass filters unusable, since the
cable companies like to put the digital channels up high. If you put in
a low-pass filter to "clean up" the high frequencies for use with
modulated channels, you might wipe out a bunch of digital channels.
See the attachment (courtesy of Channel Vision) for a list of frequencies and channel numbers. Use the right-hand "CATV" side.
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Digital
cable channels are compressed and several digital cable channels can
take the place of a single analog channel. So the "number" of a digital
channel is meaningless when talking about analog channels. They are
simply made up and assigned by the cable company. The cable box sorts
it out and makes it work just like a numbered analog channel for you.