DB
ELETTRONICA TELECOMUNICAZIONI S.p.A.
KCL 30 SY
- FM broadcasting exciter/transmitter - U
SER
’
S
M
ANUAL
14 /37
5.
ADJUSTMENTS AND MEASURES
5.1
AF INPUTS AND MAIN CARRIER DEVIATION
For Left and Right input signals (KCL 30 SY /S), use the corresponding female XLR connectors on
the rear panel. The input impedance is 600
Ω
.
Adjusting the input trimmers, the transmitter can accept input signal levels ranging from about -6
dBm to +10 dBm with 75 kHz peak deviation.
For a Mono input signal (a KCL 30 SY no stereo generator inside), the input female XLR connector
can accept the same input signal levels as the aforementioned Left and Right signals.
For a MPX input signal (a KCL 30 SY no stereo generator inside) the input BNC connector (10 k
Ω
input impedance) can accept input signal levels ranging from -3 dBm to +3 dBm with 75 KHz peak
deviation.
For SCA signals (>53 kHz), use the input BNC connectors (1 k
Ω
input impedance).
The SCA input level for a correct deviation of the main carrier (
≈
1.25 KHz peak) is
about 0.3 Vpp.
To adjust the peak deviation of the main carrier, use the push-buttons and the LCD grafic display on
the front panel.
5.2
SYSTEM CHECK
On the front panel a section labelled “STATUS” allows the main functions and the protections of
the exciter/transmitter to be monitored.
⇒
The “LOCK” led
light shows the correct lock of the frequency synthesis circuit on the
modulator board.
