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TECHNICAL APPENDIX
| TECHNICAL APPENDIX 188
16.11.15
RDS CT Data test (Tuner-1 Tuner-2)
This test checks alarms and traps on a Radio tuned on frequency 100.5MHz that carries CT service.
The test was carried out on both tuners.
The system can check CT service signal presence and time offset between internal system clock and CT carried time.
First, we have set Radio CT=ON with an offset about 10 min.
When system receives first CT data, displays it and calculate time difference:
Then we have tested in Static Mode with Timeout=360 sec. and Offset Time = 60 sec.
Timeout field indicates max time the system wait for a new CT group before raise up an alarm.
Under the alarm condition the RDS alarm led (we have associated the CT alarm to the panel led Rds error) on the panel
must be on (not flashing) and clicking on the channel number of the correspondent tuner the RDS error will be displayed
(“RDS DATA”).
Tested in Scan mode with 3 frequencies:
F1: 100.5 MHz
F2: 95.3 MHz
F3: 96.7 MHz
and Timeout=360 sec.
– Max Offset=60 sec. as depicted below.
Same conditions of Static mode test. The behavior is as illustrated for PS Scan Mode test.
System cycles thru selected frequencies. At first time CT signal arrives on Channel1 radio, alarm raises up and
corresponding CT field shows a red underlined text: “OFFSET ERROR”.