Solidyne 542 APC, Руководство пользователя

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OUTPUTS
MPX
The stereo encoder has dual MPX output with independent level adjustment. Connect an MPX output
to the transmitter using 50 or 75 Ohm coaxial cable.
AUDIO
542 APC has two balanced analog stereo outputs: XLR and RJ45. Both outputs gives the same audio
signal. From the WEB Panel, the de-emphasis curve (50/75uS) can be enabled/disabled for each output
(for WEB-casting or link with repeaters).
MODULATION INDEX
To adjust the modulation index, 542APC has:
• Built-in FM tuner
• Modulation meter
• Reference tones generator
RECEPTION ANTENNA
The broadcast of the station (or any other FM station) can be tuned into the 542, to monitor in real
time the modulation index and other measurements.
Connect the supplied telescopic antenna to the FM ANT (BNC) connector on the rear panel. Two
receiving antennas are included from the factory: a telescopic antenna and a fixed micro-antenna.
Usually the telescopic antenna is suitable for reception at the transmitting plant. For more details
on reception and antennas, see 2.4 - FM receiving antenna.
CALIBRATION TONES
Using a computer on the same LAN that the 542APC, run a WEB browser (preferred Google
Chrome) and enter the IP showed in the display to access to the 542’s WEB pages.
Switch to SETUP view .
Go to the left menu at and click on FM Output (MPX).
Turn on the CALIBRATOR. The input signal will be replaced by
a sinusoidal tone. By default, the pilot tone is set at 9% and
RDS modulation is 4%.
SET THE MODULATION INDEX
From the WEB pages interface, access to the FM tuner/analyzer
by clicking the option on the left menu.
Set the FM dial to receive the transmission.
Check the modulation depth on the
FM MODULATION MONITOR .
The measurements are valid only when the indicator RxQTY re-
ports GOOD .
If the reception is poor, check and adjust the orientation of the an-
tenna, or change the antenna by other type.
Change the MPX gain of the transmitter until achieve the desired
modulation index on the 542’s modulation meter (usually 100%).
The default level for MPX output is 5 VPP. For fine tuning, change
the MPX output level
Turn off the calibrator. The program signal is reestablished. Audio peaks will modulate exactly at
the level set with the calibrator.
Page 8 Audio Processing Core - SOLIDYNE 542 APC