EXC-GT – FM super-compact transmitter series
User’s manual – Page 25 of 98
21) Ensure that the
EDIT
option is selected; otherwise, turn the knob to select it, then press to confirm.
22) A value will be indicated after
Nom. Input
, normally pre-defined at
+6.0 dBm
.
23) Turn the knob to adjust the value based on the modulation level used. The peak deviation indicated by
Mpx
, expressed in
KHz, will consequently be changed. Note that, to the right of the deviation, the value of the modulating signal will be
indicated, as compared to the nominal value set.
24) Ensure that the measured peak deviation does not exceed local regulations, then press the knob to confirm the setting.
25)
OK
will be highlighted. Three choices are now available:
o
If the parameters set are correct – skip directly to step 26) to confirm the settings.
o
If the parameters set are all incorrect – cancel all settings by turning the knob until
ABORT
is highlighted, then skip to step 26).
o
If a slight adjustment to the parameters is required – turn the knob until
EDIT
is highlighted, then return to step 22).
26) Press the knob to confirm. You will return to the page indicated in step 3).
For audio modulation, we recommend that users adopt a nominal peak level ranging b6 and + 11.5 dBm.
8.1.e Modulation
limiter
27) Turn the knob until the
LIMITER
sub-menu is selected, then press the knob to confirm.
28) The modulation limiter adjustment screen will appear (
2
section 10.3.e):
29) Ensure that the
EDIT
option is selected; otherwise, turn the knob to select it, then press to confirm.
30) A value will be indicated after
Limiter
. This indicator is normally followed by
OFF
or by the limiter intervention value,
expressed in dB, in reference to a deviation of 75 KHz.
31) Turn the knob to set the desired value (0 dB = limiter intervention of 75 KHz), then press the knob to confirm.
32)
OK
will be highlighted. Three choices are now available:
o
If the parameters set are correct – skip directly to step 33) to confirm the settings.
o
If the parameters set are all incorrect – cancel all settings by turning the knob until
ABORT
is highlighted, then skip to step 33).
o
If a slight adjustment to the parameters is required – turn the knob until
EDIT
is highlighted, then return to step 30).
33) Press the knob to confirm. You will return to the page indicated in step 3).
,
According to Italian law, the limiter must intervene above 75kHz. This transmitter fully complies with Italian regulations
when the limiter is set at +0.5dB, equal to 80 kHz.
When the limiter begins to intervene, the modulation distortion increases. As such, the modulation sensitivity should be
adjusted (
2
section 10.3.c) so the limiter intervenes sporadically. Using this approach, its operation is generally imperceptible.
When the limiter activates, the
LIMITER
LED lights up in red.
8.1.f
Transmission
modes (mono/stereo) and preemphasis
34) Turn the knob until the
MODE
sub-menu is selected, then press the knob to confirm.
35) The transmission mode settings screen will appear (
2
section 10.3.f):
