AVS Member sydyen has prepared a great writeup of info and a procedure for finding Comcast digital channels that they map to "deep" subchannels that escape this DVDR's Auto Channel Preset channel scan.I've incorporated that writeup here, in the "Tuning" help file.
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Background if interested:
As you know, our DVDR's can skip an entire digital channel group if the 1st subchannel, XX.1, is Scrambled or "blank" in a cableco's channel lineup.
If you've got a digital-tunered TV, you may see those deep subchannels somewhere in the TV's channel lineup, like 107-300, and you can usually use the PhilMag's Manual Channel Preset menu to enter that major channel number, 107, which will enter ALL tunable channels in that group in memory, even the "Scrambled" ones.
Comcast seems to do things differently in certain areas so some channels don't map to the same major channel number. This means a tedious blind search for the exact channel and subchannel location that fits our Phil Mag tuner's mapping method.
The "Sydyen Procedure" linked above uses Comcast's Digiital Transport Adapter (DTA), which they provide free to subscribers, to discover the exact mapped location of all the tunable Comcast channels, which *should* also be tunable by the PhilMag DVDR.
Please post any comments to this procedure... or PM sydyen directly here
... he'd esp. like to hear about any info or procedures on other DTA-type boxes you might have.