Your TV/DVD/VCR combo can indeed use the signal from the box to record. the port on the back labeled 'cable/ant' is the same thing. the only difference is that you will have to remember to change the channel when you record since the box controls that and not the timer built-into your combo. but yes, a combo unit can record from an outside source. that's what it does on analog and what it will continue to do with the converter. the converter simply acts as a RF modulator which converts digital television to analog television so the only thing which changes is you change channels with the converter and you use an extra outlet to plug the box in. nothing more. just be careful with timer recording since the timer won't be able to change the channel from the converter. you also may need two remotes or a universal remote to control both the box and TV set.
The Dish Network DTVPal+, not the
DVR but the converter itself, has a 'event timer' which changes the channel automatically so you can still timer record.