Broadcast quality

I am producing a 30 minute program that airs on a national network. Currently all projects are entirely SD and shot on several different 1/3 and 1/2 inch chip cams. (Sony DSR 390) This footage is being uploaded through a Panasonic AG-DV2500 player via firewire onto a MACPRO (1.8 terabytes). Editing is done in FCPS2. Once all editing is down, we are recording back to mini dv tape and then sending off for conversion to Beta SP. When I watch my program on TV it is lacking quality in my opinion. It does not appear as sharp as it should be and just lacks overall picture quality. I am comparing it to other programs that are shot with much lesser cameras and the other shows appear to have better resolution/picture quality.

Now I am wondering if I am capturing my footage at full quality, or if some other setting could be off. Or, could it be the method in which the company is converting my video to beta sp format?