ive read on a heap of websites to use an 'active transponder' when searching for a satellite?<br /><br />what does this mean.. im trying to find optus B3.<br /><br />on B3 im using 12674/22500<br /><br />http://www.lyngsat.com/optusb3.html<br /><br />how can you tell which is active.. and why does active make a difference?!