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5. Activate the unit following the “Activating XM-100”
instructions.
Optimizing Signal Strength
For robust operation, signal strength received from the
antenna must be optimized. Optimum alignment of the
antenna may be achieved using the signal strength menu.
Press and hold the power button for 4 seconds, a display
similar to below will appear.
CN1 CN2 TBER
9.0 8.5 12%
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. The
audio mute threshold for the terrestrial signal is approximately
6% bit error rate.
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 that the antenna be
repositioned.