ECRESO FM 100/300 W, user manual– 06/2015
Page 36
Head Office : Parc d’activites Kennedy - 20, avenue Neil Armstrong – 33700 Bordeaux-Merignac (France)
Tel +33 (0)5 57 928 928 – Fax +33 (0)5 57 928 929 –
www.worldcastsystems.com – [email protected]
5.5.
Line 1 (ANA) parameters
These parameters are available as:
Front panel
LINE 1 menu
see section 6.3.7
Serial commands
INPUT.LINE1
see section 7.2.6
Engi PC application
Audio Input page
see section 8.2.2
Embedded web site
Transmitter/Input Source/Line1 page
see section 9.4.5
PRESENCE
(INPUT.LINE1.PRESENCE) – read only
This parameter indicates the presence of audio signal at the input: none, left, right or L&R.
NONE, L, R, L+R
LEVEL
(INPUT.LINE1.LEVEL) – read/write
This parameter is the max audio peak in dBu that can come from the transmitter on the LINE1 input. For example, if
the audio peak from the source is +6 dBu, this parameter must be set to +6 dBu 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 LINE1 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 -18 dBu to +18 dBu
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 set 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
