Phantom Keying Configurations - Park Air T6T User Manual

0 V
-10 to -50 V
-10 to -50 Volt Keying with Negative Going Active Signal
0 V
-10 to -50 V
-10 to -50 Volt Keying with Positive Going Active Signal

PHANTOM KEYING CONFIGURATIONS

Phantom keying can be used with the transmitter. This involves superimposing a dc potential on the
audio lines at the control equipment. The potential can be 0 volt, or between 10 and 50 volts as shown in
the illustrations on the opposite page.
To use phantom keying, the PTT switch at the control equipment must connect to a centre-tap on the
600 ohm audio transformer. The keying potential is connected to the centre-tap.
At the transmitter, jumpers JP8 and JP9, fitted to the DSP module, must be correctly set for phantom
keying.
Note that the audio lines in the illustrations connect to the transmitter's Facilities connector CN5. If
phantom keying is required when using a MARC, or compatible control and data system, the lines
connect to the MARC connector CN6 pins 2 and 3.
Section 2
Page 12
PTT
PTT
T6T Transmitter
Phantom Keying
Remote Keying
JP8 JP9
[Front panel PTT Polarity = POS]
T6T Transmitter
Phantom Keying
Remote Keying
JP8 JP9
[Front panel PTT Polarity = NEG]
T6T AM-Voice Operation
28V
0V
28V
0V