VX3 TO VX6 INSTALLATION MANUAL PROGRAM INPUTS
PAGE 1.7.2 VERSION 1.0 2023-08-16
MPX/SCA Inputs
There are two MPX/SCA inputs on the rear of the VX3 to VX6 that accept a baseband audio signal that
can include composite audio, RDS and SCA signals. The two balanced inputs (30 Hz to 100 kHz) are
provided on the MPX/SCA1 IN and MPX/SCA2 IN female BNC connectors and are user configurable to
be an MPX or MPX SCA input. The input impedance for each input is 10 kohms.
If an MPX composite signal is the signal source, the level is factory set at 3.5 V pk-pk for ± 75 kHz
carrier deviation, and is adjustable between 1.0 V and 5 V pk-pk.
NOTE:
The Balanced Composite input can also be used with an Unbalanced source as the input on the
Analog Audio PWB is not center tapped
.
If an MPX SCA is the signal source, the level is factory set at 3.5 V pk-pk for ± 7.5 kHz deviation, and is
adjustable between 1.0 V and 5 V pk-pk
NOTE:
If the main program source is an MPX input, meters for MPX SCA will display “N/A”.
Digital Inputs
AES/EBU Inputs
The VX3 to VX6 accepts AES/EBU digital audio on the AES/EBU IN 1 and AES/EBU IN 2, 3-pin female
XLR connectors (110 ohm balanced; support sample rates between 32 to 192 kHz). Connect (+) to pin
2, (-) to pin 3 and shield to pin 1 on the XLR connectors. The VX series transmitter's remote AUI or front
panel UI allows for configuration of the audio input mode (left, right or stereo) and level (in dBfs).
Default factory setting is -4.0 dBFS which produces 100% modulation and is adjustable between -25.0
and 0.0 dBfs.
Other Features
Carrier Frequency and Pilot Phase Control (10 MHz and 1 PPS IN)
The VX3 to VX6 provides carrier frequency and pilot phase control from a precision GPS reference on
the exciter/controller assembly’s 10 MHz IN female BNC connector (between 0.5 V and 2 V pk-pk sine
wave input; 50 ohm input impedance) and 1 PPS IN female BNC connector (5 V TTL input level, 10
kohm input impedance).
Pilot Out
The VX3 to VX6’s exciter/controller assembly provides a 1 V pk-pk (default), 19 kHz pilot signal on the
19 kHz OUT female BNC connector. The output level is adjustable from 0 - 2.7 V pk-pk through the
Remote AUI or the Front Panel UI.
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