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H E A D S
U P
T E C H N O L
5.1.2
Signal Quality Monitor
Once the access code is entered, press the "
MONITOR" screen should appear in the song information area of the display as shown
below, if not, re-enter the access code.
The display above shows the quality of all three XM signal sources to the current
selected receiver. The quality of the signal is represented as a Bit Error Rate (BER)
value where the lower the number, the better the signal. The satellites BER are a ratio of
X/5440 and the terrestrial BER is a ratio of X/6800. A 1% BER (54 or 68) or less for at
least one signal source is considered "Good" and a 100% BER (5440 or 6800) is "No
Signal". The signal is "Weak" when the best BER out of the three sources is more than
4% (219 or 273).
Note: The design of XMR system is not intended to receive the terrestrial signal and this
value should only be considered if the both satellite signals are "5440".
Pressing the "Receiver:" key on the XMC100 as required, displays the signal quality
information of the remaining receivers included in the system.
5.2 System Communication Check
The XMC100 controller and receivers use an internal RS-485 bus to communicate
commands, channel information and status messages. At the Signal Quality Monitor
shown above, pressing the "
below:
XMR-3
Rev. C, 04/05/06
O G I E S
?
" key twice and a "SIGNAL QUALITY
?
" key again replaces it with the "RS-485 Monitor", shown
XM Radio
Installation Manual
Signal BER Values:
S1B: "Sat #1"
S2B: "Sat #2"
TB = "Terrestrial"
Page 26 of 31
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