When Setup – Signal Quality is displayed, pressing the Mode button brings up the following menu:
CN1 CN2 TBER #.# #.# ###
This menu may also be displayed by holding the power button for 4 seconds when at the main display. Pressing the Mode button returns up one menu level. Pressing the power button exits the setup menus to normal operation.
CN1 and CN2 indicate the carrier to noise ratio of the satellite signal received from the two XM satellites positioned in the southern sky over the equator. The higher the number the better, and both numbers should be 10 or greater for good margin, but not less than 7.0.
TBER is the percentage of bit errors received from a terrestrial repeater, if there is one. Acceptable values for this number may be anywhere from 0% if a repeater is nearby, to 100% if only the satellite signals are available – lower is better.
Position and rotate the antenna for the optimum balance (highest readings) for CN1 and CN2. Note that CN1 measures signal received from the satellite in the Eastern sky, CN2 signal received from the satellite in the Western sky. Obstructions such as trees or tall buildings may interfere with reception of one or more satellite signals and require the antenna to be repositioned.
Line Level
When Setup – Line Level is displayed, pressing the Mode button brings up the following menu: