I've been using the RCA DTC-100 as a tuner for a while in a second room but what I thought was HDTV really seems to be some lower resolution (I'm more of an audio guy, so video isn't my forte).

I have been using the RCA DTC-100 with a computer monitor hooked up to the VGA port. Some stations come in a lot clearer than others, so I figured those were HDTV. The RCA's menu shows these as "Digital" with no other description. The computer monitor, however, has a menu that shows the resolution in use and this always says 640x480, no matter what I set on the RCA tuner.

To test this, I took the tuner to the other room and plugged it up to the Audio Authority vga-to-component converter and plugged the component cable into the second input on my wide screen Panasonic TV. The AA converter supports 480i, 480p, 720i, and 1080i and just transfers the resolution that is put in w/o conversion. The Panasonic accepts 480i, 480p as well as 1080i (not 720). No matter what I set on the RCA DTC-100, I get no picture.

So how do I get the RCA tuner to:

- Show what resolution it is sending?
- Change the resolution?