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Crown Broadcast FME 350W to 2000W User Manual– 05/2013
Page 56
Crown Broadcast, a division of International Radio & Electronics Corporation 25166 Leer Drive, Elkhart, Indiana, 46514-5425 USA
Ph +1 (574) 262 8900
DRIVE
(INPUT.LINE1.DRIVE) – read/write
With this parameter, you can slightly compensate the input audio level. It directly affects the final deviation. A
negative value decreases the deviation; a positive value can increase the deviation and/or cause the MPX
hard clipper to be used (if enabled) which in turn may lead to audio distortion. We recommend you leave it at
0 dB.
From -6 dB to +6 dB
RIGHT TRIM
(INPUT.LINE1.TRIM) – read/write
With this parameter, you can correct the balance between the Left and Right channels. However, it is better
to look for and correct the cause of a lack of balance (before the transmitter) rather than correcting it at this
stage. A positive value increases the Right channel; a negative value decreases the Right channel level. It is
best to leave it at 0 dB.
From -3 dB to +3 dB
FILTER
(INPUT.LINE1.FLT) – read/write
This parameter is crucial; it sets the low-pass filter applied on the audio input. The FM bandwidth is limited to
15 kHz, so
the filter must be set to 15 kHz for the FM
. Digital technology and the quality of the internal
stereo encoder make it possible to set the filter at 16 or 17 kHz while maintaining an acceptable pilot
protection. Select 0 kHz to disable the filter. This solution can be used in mono operation (in stereo
operation, the incidence on the MPX signal and its sub-carrier would be too great) or when a 15 kHz filter is
already used upstream as with an FM processor, for instance. In this specific situation, you may also use 2
filters, the standard 15 kHz standard filter with the external processor, plus the 16 kHz transmitter filter. The
listeners will hear the processor’s filter; the internal filter will take the relay in case of issue with the
processor.
0, 15, 16 or 17 kHz
PREACC
(INPUT.LINE1.PREAC) – read/write
With this parameter, set the pre-emphasis. Select 0 µs is the audio signal is pre-emphasized before getting
to the transmitter. Otherwise, select according to the country: 50 µs in Europe, 75 µs in the USA.
0, 50 or 75 µs
5.4.4. Line2
menu
(AES)
These parameters are available as INPUT.LINE2 serial commands (see section 6.2.5).
They are identical to LINE1 menu parameters, except for the level.
LEVEL
(INPUT.LINE2.LEVEL) – read/write
This parameter is the max audio peak in dBu that can come from the transmitter on the LINE2 input. For
example, if the audio peak from the source is -4 dBFS, this parameter must be set to -4 dBFS for optimal
operation. If you do not know the audio source level, you may use an audio analyzer or display first level
measurements on the front panel to read the LINE2 LEVEL. Be aware that if the level is poorly set, the
deviation may become too low or too high. This level is also called nominal level, i.e. the level producing the
deviation as set in the Modulation menu.
From -20 dBFS to 0 dBFS