Am I missing something in the settings to allow higher channel numbers.
If the Philips DVDR3575H/37 can not support this, is there a particular type of tuner a DVD recorder needs to do this?
Your cable company wants you to rent one of their boxes so they place many channels on higher ("virtual") numbers, above the 1-125 analog and 1-135 digital channels in your HDTV's or this DVDR's tuner. However, this DVDR will tune those channels, if they're not scrambled, by remapping the virtual channels to "physical" numbers within the tuner's 125/135 range.
This Silicon Dust website might help find your channel relationships. Enter zip code, then select the source (cableco) above the list to see their "virtual" channel numbers and the physical locations on a HDTV's or DVDR's 125/135 channel range. Tune to the physical channel numbers and check STATION AND CONTENT to make sure each physical channel is what you expect.
Of course, your 3575 will only be able to tune channels the cableco doesn't scramble, called the "clear-QAM" channels.
I assume you've done an Auto Channel Preset > Cable (Analog/Digital) as described here?
A new world is open to you now! Congrats!
Now, make sure you set your TV Aspect to "16:9 Wide" to see your new digital channels in glorious widescreen. Analog channels will look slightly "stretched" if you have a 16:9 HDTV, but it's not so bad I feel like changing aspect back to 4:3 for those channels... I MUST have my digital WS programs in true WS!
Some programs on digital channels might also be produced in 4:3 aspect, but again, so what as far as I'm concerned!!!
Cablecos like to put channels on high-numbered channels only their rental box can tune. These are "virtual" channel numbers that TVs and DVDRs will "re-map" to their "physical" channel numbers... 1-125 analog and 1-135 digital. Also, there can be duplicate channels where two of them try to occupy the same physical channel number. Two remedies, depending on what's actually happening.
1. If your problem stems from virtual channels mapping to physical channel numbers, this Silicon Dust website should help find your channel relationships. Enter zip code, then select the source (cableco) above the list to see their "virtual" channel numbers and the physical locations on a HDTV's or DVDR's 125/135 channel range. Tune to the physical channel numbers by direct entry (no CH+/-) and check STATION AND CONTENT to make sure each physical channel is what you expect. You may even have to ADD a physical channel using the Manual Channel Preset menu if your Auto scan missed it so you can use CH+/- to surf to it?
2. If your problem stems from just a duplicate channel, see this help file, item 4 in the "Specific DVDR Problems and Solutions" section.