Convert DTV to FTA, or DN to FTA? Well, yes and no. If you want the performance we enjoy, like blind-scanning and other advanced features, forget-about-it. I always hoped to get some use out of the satellite IRD 'junk' I collected, some with UHF remotes. So, I googled and searched, until a few years ago when there appeared talk about limited success -- being able to receive FTA only, even set the LNB LO for Ku, DiSEqC functions, but only those channels with a 20M symbol rate would work, like the current Galaxy 25 transponder bouquet which includes Al Jazeera English. A couple years later that limitation was finally solved. The overall result was a poor man's unit -- usable for FTA only with no blind scan, no serial port or ability to add one, and erratic or wrong signal/quality readings. That's right, a DTV DSS unit can be made to do DVB, like a DN or original FTA unit can -- purely a firmware issue. [Think Twinhan 102A.] But, only a very few older IRD models could be converted, models with the exact same processor as the Pansat 2500/2700. What it amounted to was a complicated J-tagging process to erase all proprietary firmware, effectively turning the box into a useless orphaned brick of components -- a box of rocks, and then reflashing with original Pansat firmware rewritten to match an entirely different animal of tuner, larger flashROM and CPU in/out port mapping, remote control and front buttons, ect. Far more involved than merely flashing an exchange of firmware basic to the CPU. It was a proof of concept project, that eventually succeeded for the most part, by coders without malicious or criminal intent. It laid to rest the rumor and controversy about what could or wouldn't work, forever. The fixed symbol rate issue was only imagined to be hardware related. As DN eventually uplinked some channels with a higher symbol rate, that assumption came under stronger scrutiny.
It's all very interesting if you have the curiosity, mind, time and patience for it. Otherwise, use the time to make money and then go on eBay and buy a cheap FTA unit, dead or alive. Even J-tag it back to life if necessary. When I started out in FTA I bought a DVB Viacast unit for more than what a new Pansat 2700 costs today, sat switch and serial cable included. The Viacast was a very solid and basic commercial machine, but no blindscan and slow as heck - still fun though. It was a relief to finally own a Pansat 2500 that could find unknown feeds and actually let me see quality readings long enough to position the dish. The Viacast couldn't do that, it had some wierd time-out in the menu. Also some scrambled channels would cause it to lock-up solid. Real fun when the first channel it sees in the line-up after a transponder scan is scrambled. People who start out with something insane like that and survive to graduate to today's standards are a proof of concept success by themselves.
-sidha