Helios FM 20/100 W, user manual– 12/2011
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measurements on the front panel to read the MPXn 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.MPXn.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
RMS
(INPUT.MPXn.RMS) – read only
This parameter indicates the average value of the transmitted signal’s excursion in kHz.
From -150 to +150 kHz
PEAK
(INPUT.MPXn.PEAK) – read only
This parameter indicates the peak value of the transmitted signal’s excursion in kHz.
From -150 to +150 kHz
5.4.6. AUDIO GENE Menu
The audio generator is a multiplex channel and is therefore not affected by the stereo encoder parameters.
These parameters are available as INPUT.AUDIOGEN serial commands (see section 6.2.5).
STATE
(INPUT.AUDIOGEN.STATE) – read/write
With this parameter, set the type of MPX signal generated by the internal generator.
OFF, PILOT, L, R, L+R (mono) or L-R (stereo)
PREAC
(INPUT.AUDIOGEN.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
LEVEL
(INPUT.AUDIOGEN.LEVEL) – read/write
With this parameter, set the internal generator audio level.
From -100.00 to 12.00 dBFS
FREQ
(INPUT.AUDIOGEN.FREQ) – read/write
With this parameter, set the internal generator audio frequency.
From 0 to 100000.00 Hz
