Thats the issue I don't know how to do a manual PID scan onthe Mercury II receiver.
From the mercury manual:
To add a channel (Page 20):
Satellite: Select the satellite you want to add the channel to.
Transponder: Select TP frequency that the channel is on. If the TP does not exist in the list, you will need to add the TP first in the Antenna Setup menu.
Channel Name: Enter the new channel name by pressing the alphabetic buttons.
Video PID: Enter the Video PID value by pressing the numeric buttons.
Audio PID: Enter the Audio PID value by pressing the numeric buttons.
PCR PID: Enter the PCR PID value by pressing the numeric buttons.
Store: Press OK to save data. The channel will be added to the Channel List.
To add a transponder (Page 11):
Satellite: Select the satellite that you want to get the signal from.
Frequency: Enter the TP frequency with the numeric button or select one using the < VOL > buttons.
Polarity: Select Vertical or Horizontal polarity.
Symbol Rate: Enter the TP symbol rate value with the numeric button.
Network Scan: You can select NIT (Network Information Table) scan On/Off.
Save Edit: You can save/delete edited TP.
If you press the Green button, it will start to search all channels on the selected TP.
If you press the Yellow button, it will start to search only FTA (Free-to-air channels on the selected TP.