Vitec Group Communications
PTX-3 UHF Digital Hybrid IFB Transmitter
1 - 5
positions of the individual switches. For detailed information on the
setting of these switches see the Installation and Operation section.
MODE SWITCHES
The MODE switches allow the PTX-3 to accommodate a variety of
input source levels by changing the input sensitivity and the pin
functions of the input XLR jack. Marked on the rear panel are the most
common settings. Each setting is detailed below. Switches 1 and 2
adjust the XLR pin functions while switches 3 and 4 adjust the input
sensitivity.
Table 1-1: Mode Switches
POWER INPUT CONNECTOR
The PTX-3 is designed to be used with the CH20 external (or
equivalent) power source. The nominal voltage to operate the unit is
12 VDC, although it will operate at voltages as low as 6 VDC and as
high as 18 VDC. External power sources must be able to supply 200
mA continuously.
NAME
SWITCH
POSITIONS
1 2 3 4
XLR PINS
BALANCED
INPUT
SENSITIVITY
CC
3=Audio
1=Common
No
-10 dBu
MIC
2=Hi
3=Lo
1=Common
Yes
-42 dBu
LINE
2=Hi
3=Lo
1=Common
Yes
0 dBu
RTS1
2=Hi
1=Common
No
0 dBu
RTS2
3=Hi
1=Common
No
0 dBu
