Park Air Systems Limited B63300HS Manuel D’Utilisation
T6T 300 Watt VHF Transmitter
Page 90
Installation
Fig 26 Remote Keying
Fig 27 Phantom Keying
T6T Transmitter
MARC Audio Connector
Audio is pins 1 and 2.
Audio is pins 1 and 2.
Audio line 1
Audio line 2
PTT
Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
PTT
Switch
Switch
V
PTT
The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen:
❑
PTT is active when V
PTT
differs from the transmitter reference voltage by more than 10 V.
❑
PTT is inactive when V
PTT
differs from the transmitter reference voltage by less than 1 V.
❑
Maximum value of V
PTT
is ±60 V with respect to transmitter reference voltage.
Example:
To use 0 V as the keying potential, V
PTT
= 0 V; set transmitter reference voltage to +14 V; set PTT In to STD.
Cross-Site Lines
Audio
Circuit
Circuit
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
Input will draw no more than 6 mA.
PTT is pin 6
MARC Connector
Audio is pins 2 and 3.
PTT is pin 4
Audio is pins 2 and 3.
PTT is pin 4
MARC or
MARC Audio
Connector
MARC Audio
Connector
Control
Equipment
Equipment
Ground is pin 7.
Ground is pin 1.
T6T Transmitter
PTT
Switch
Switch
Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
V
PTT
To reduce the number of cross-site lines between the control site and the transmitter, phantom keying may be employed.
This method has the keying potential (V
This method has the keying potential (V
PTT
) superimposed on the audio lines instead of using a separate line.
The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen:
❑
PTT is active when V
PTT
differs from the transmitter reference voltage by more than 10 V.
❑
PTT is inactive when V
PTT
differs from the transmitter reference voltage by less than 1 V.
❑
Maximum value of V
PTT
is ±60 V with respect to transmitter reference voltage.
Example:
To use 0 V as the keying potential, V
To use 0 V as the keying potential, V
PTT
= 0 V; set transmitter reference voltage to +14 V; set PTT In to STD.
Audio lines with phantom keying
signal superimposed
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
Input will draw no more than 6 mA.
MARC Audio Connector
Audio is pins 1 and 2.
Audio is pins 1 and 2.
MARC Connector
Audio is pins 2 and 3.
Audio is pins 2 and 3.
MARC or
MARC Audio
Connector
MARC Audio
Connector
Audio
Circuit
Circuit
Control
Equipment
Equipment