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User Manual
Rev. 1.0 - 29/11/05
PTRL NV/3 & RXRL NV/3
9.6.4 Screen #25: Auxiliary input channel level setting
This screen lets you set auxiliary channel sensitivity. Acceptance field is from -12 to
+4 dBm to achieve 10% modulation, corresponding to 7.5kHz deviation, i.e. 0dB in
the upper display line. The upper line shows actual channel modulation in real time.
The lower line shows nominal sensitivity value in dBm.
9.6.5 Screen #26: Limiter setting
This screen lets you set limiter operation. You may set the limiter threshold level and
enable/disable the limiter (ON/OFF).
Depending on local regulations, the limiter may be set to maximum nominal level
(0dB, i.e. 75kHz modulation) so as to cut just above this level, or to a slightly higher
level so as to allow for some margin to accommodate peaks, for instance to +2.5dB,
which corresponds to a peak 100kHz deviation. Maximum setting allowed is +7.1dB,
which triggers limitation at over 170kHz: with this setting, it makes no difference
whether the limiter is enabled or disabled.
It is a good rule to prevent the audio signal from exceeding limiter threshold too
frequently, or modulation distortion will result.
9.6.6 Screen #27: Setting transmission mode and preemphasis
From this screen, you may set transmission mode (MONO R, STEREO, MONOL+R,
EXT MPX) and preemphasis (0, 25, 50 and 75µs).
Standard preemphasis adopted throughout Europe and in many other countries is
50us. In the American area, standard preemphasis is 75us. Preemphasis only takes
effect on audio channels and will not affect an external multiplex signal.
AUX 2.0kHz -11.5dB
Nom.input = + 0.0dBm
MPX limiter + 7.1dB
ON
MODE/PREEMPH. SETUP
MODE STEREO PR=50us
Summary of Contents for PTRL NV/3
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Page 8: ...4 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 This page was intentionally left blank...
Page 55: ...51 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 Ensemble View 10 1 PTRL NV 3...
Page 56: ...52 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 2 RXRL NV 3...