Axel WOLF 1MS, User Manual, Page: 169 / 229

TECHNICAL APPENDIX
| TECHNICAL APPENDIX 169
16.11.8
MPX Audio Deviation Test (Tuner-1 Tuner-2)
An RF combined signal with one or more frequencies is applied to the tuner1 and/or tuner2 RF inputs. The MPX Audio
Deviation on one carrier RF level will be varied to test the alarms while the other ones will be used to fill the scanning list.
We have used 100.80MHz (Audio MPX level sweeping) and 100.50MHz(Audio MPX stable).
By slowly changing the MPX Audio deviation (in compatible way with the Silence and Hold time chosen) around the test
zone, wait for the alarms and go back up to the starting point. The deviation should be generated from a controlled
compressed audio from and audio processor.
Tested in Static mode first.
In static mode the alarm rises up after the MPX audio deviation is under threshold for the silence time , a trap will be sent
when the status variable changes but with the time and the Audio MPX value of the first sample out of the range. When
the MPX Audio deviation is greater or equal to THR for the Silence Hold the status alarm comes back to the (ok) state
and another trap will be sent with the Audio MPX value and the time of the first sample valid.
Set the kHz to dBr Conversion to the chosen reference. (75kHz for TDF, 20kHz for MB [40kHz=6.0dBr])
We have tested in static mode with the following values:
Thr: -20dBr, Silence:2sec, Hold:2Sec
Thr: -20dBr, Silence:20sec, Hold:10Sec
Thr: -20dBr, Silence:180sec, Hold:60Sec
The behavior observed has been compatible with the definition with an accuracy error on the measure less than 2 kHz
and timing errors of about 1-2 seconds
Typical Accuracy and Precision expected in general (RF Level > 70dBuV):
Min Dev value readable : 0 kHz, Max Dev value readable: +120 kHz
0.0 kHz is read (Range 0 kHz to +2.9 kHz)
Accuracy: +-2 kHz, Precision +-2 kHz (Range 3 kHz to +9 kHz)
Accuracy: +-2 kHz, Precision +-1 kHz (Range 10 kHz to +99 kHz)
Accuracy: +-3 kHz , Precision +-1 kHz (Range 100 kHz to +120 kHz)
Under the alarm condition the MPX alarm led on the panel must be on (not flashing) and clicking on the channel number
of the correspondent tuner the MPX error will be displayed. “AUDIO DEV”