Axel WOLF 1MS, Руководство пользователя, Страница: 172 / 229

TECHNICAL APPENDIX
| TECHNICAL APPENDIX 172
16.11.9
Audio Left/Right level 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 Audio the
Left/Right level on one frequency will be varied to test the alarms while the other ones will be used to fill the scanning list.
We have used 100.80MHz (with left/right audio silences) and 100.50MHz (audio without audio silences).
Test left/right level generating silences on both channel compatibly with the silence and hold times.
Settings 75kHz (TDF setup) as dBr references and testing with a typical Mpx stereo signal (6.5kHz pilot deviation,
2.5kHz rds deviation) means audio peaks at about (66kHz) so about -1.1dbr from the reference.
On the silenced audio channel is expected to see a level of about -43dBr (peak) and about -50dBr (rms) with medium
compress audio.
Settings 20kHz (MB setup) as dBr reference and testing with a typical Mpx stereo signal (6.5kHz pilot deviation, 2.0kHz
rds deviation) means audio peaks at about (66.5kHz) so about +11dBr from the reference.
On the silenced audio channel is expected to see a level of about -32dBr (peak) and about -38dBr (rms) with medium
compress audio.
We have tested (using 75kHz as reference) in static mode with the following values:
Thr: -30dBr, Validation:20sec, Hold:10Sec
Thr: -35dBr, Validation:20sec, Hold:15Sec
Thr: -45dBr, Validation:20sec, Hold:15Sec
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