In brief.<br />Grey means Feeds only<br />TP 4L or say 4H, means low or high in other words there half transponders, Need biggers dishes as you're about 6 dB down on power.<br />A3 is not much in use as all DTH (direct to home) receivers need Auto tracking to follow the Satellite.<br />LyngSat is not 100% accurate but good enough<br />Phil