AEV Stargate - Multi Coder Adjustments and Configurations; Input Level and Pre-Emphasis Settings; Baudrate, Pilot Level, and Phase Adjustments

AEV STARGATE
Futurcom Srl via della Tecnica 35, 40050 Argelato Bologna ITALY
6
7. Right channel insertion switch and indicator LED
8. Left channel insertion switch and indicator LED
9. Level meter
Rear panel
1. Switch On/Off
2. Line input connector, MAIN
3. Connector Remote for telecontrol
4. Dip-Switch to setup baudrate RS232
5. Connector RS232
6. RDS output signal Pilot phase adjust Rds level adjust
7. Composite signal output Composite level adjust
8. 19 KHz input/output signal for locking of external systems
9. SCA signal input SCA level adjust
10. Left channel input Left channel and level adjust
10. AES/EBE digital input audio signal
12. Right channel input Right channel and level adjust
Multi Coder Adjustments
Input level is the adjustment for the input signal level; it may be varied using 2 multi-turn
trimmers. The input accepts signal levels from -10 to +10 dBu.
Pre- emphasis
The pre-emphasis setup can be selected via dip-switch "PRESET":
PRE-EMPHASIS
ON 50 µSec EUROPEAN standard
ON 75 µSec AMERICAN standard
OFF
See Technical Data section.
Baudrate RS 232
The serial baudrate setup mast be set by Dip-Switch on the rear panel "PRESET".
Pilot level
This controls the pilot signal level, relative to the amplitude of the MPX output signal.
The range available is between 4 and 12% of the optimum level (-20 dB with respect to 0 dBu
of the MPX signal. This is 10% of the signal which produces a deviation of ±75 KHz).
Pilot phase
This controls the phase of the 19 KHz pilot signal and allows the stereophonic separation to be
optimized by correcting for unwanted phase shifts introduced by transmission lines.
To optimize the stereophonic separation in the absence of a professional measurement
decoder, a receiver with a good stereo separation figure should be used as described in the
following procedure:
1. apply a music signal to the STARGATE inputs.
2. disable one channel e.g. left.
3. a signal will be present on only one channnel of the receiver.
4. reduce the level of the active channel on the receiver to zero and increase the level of the
other channel until a residual signal is detected.
5. minimize this signal by adjusting the pilot phase; the calibration is complete when a
minimum is achieved.
L and R ( Left and Right Enable)