The data transponder on 81W is identified with an auto FEC. The transponder is important since it's the only full-time tp on 81W. Now that I've zeroed the fixed dish on 81W it's no longer important if I can receive the data transponder. This is why I've put my system back on Tuner A now with the fixed dish on Tuner B. I would have paid the extra for a better quality Tuner B.