Is there any way to receive more channels by just changing the CableCARD™ I have?:


No.  A common misconception is that the CableCARD itself determines whether or not a TV or other retail device can access two-way services like SDV. The reality, however, is that the current CableCARD devices were designed only to access one-way services.  As a result, in order to access channels delivered using SDV on a CableCARD-compatible retail device, you need either a Tuning Adapter or a Time Warner Cable digital converter.
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