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User Manual
Rev. 1.0 - 29/11/05
PTRL NV/3 & RXRL NV/3
5.4.4 Stereo transmission from an audio signal through internal stereo
coder (option)
1)
Connect the RIGHT and LEFT audio input connectors to the matching output of
the stereo audio source. Signals are filtered at 15 kHz and preemphasized.
2)
Select "STEREO" mode from the setup menu. Confirm preemphasis or choose
the 50 or 75 µs setting as required.
5.4.5 Operation with RDS and SCA coders
1)
Connect the "AUX" connector of the radio link transmitter to the output of the
RDS or SCA coder. If you use the internal stereo coder option, connect the
"MODULATION" monitor output to the "pilot tone" synchronisation input of the RDS
coder, if available.
2)
Change channel input sensitivity in the auxiliary channel sensitivity setup to obtain
correct deviation. Adjust transmitter sensitivity and/or external generator level to
achieve the required deviation as explained in the previous sections of this manual.
Please note that a 0dB modulation (not input level) reading in this field indicates
10% of maximum modulation or 7.5kHz deviation, which is the default setting for the
SCA auxiliary channel.
For the RDS coder, a -11.5 dB or 2kHz reading is the standard modulation value. At
any rate, in this menu the deviation for the RDS/SCA signal alone is also shown in
kHz, to avoid possible mistakes when converting the reading in dB. Many users use
a slightly higher deviation than the standard 2kHz, i.e. set deviation to 3/3.5kHz to
achieve a greater margin on FM receivers.
3)
Modulation and total deviation can be viewed on the "MPX" display along with
any other multiplex signal available at the time.
5.4.6 Final modulation adjustment
Check to ensure that overall modulation level is adequate as follows:
1)
Select menu field "MPX" on the display: total modulation will be shown both in
dB and as deviation in kHz. Display shows both an analogue bar indicator and a
digital peak readout.
2)
Send a sufficiently constant music signal to the modulation input; ensure that
the reading is slightly less than 0dB and only exceeds this threshold occasionally by
no more than 1 or 2 dB under any transmission programme conditions that can be
Summary of Contents for PTRL NV/3
Page 1: ...PTRL NV 3 RXRL NV 3 User Manual Volume 1 Manufactured by Italy...
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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...