SCS P4dragon DR-7800, Installation Manual

Page: 77 / 96

6. Connectors
72
6.2.2 Connector Pin Description
PIN 1: Audio output 1 from the modem to the transmitter.
The modem supplies a pure
audio signal to the microphone (or ACC) input of the transceiver. The output amplitude
can be adjusted with the
FSKA
and
PSKA
commands from 30 to 6000 mV (peak to
peak) open circuit. The output impedance is 600
Ω
. Is to be used in conjunction with
audio output 2 (PIN 7).
PIN 2: Ground (GND).
Collective ground for all signals in unbalanced mode.
PIN 3: PTT switch 1.
While transmission this output is switched to PIN 6 by an optically
isolated solid state relay. Is to be used in conjunction with PTT switch 2 (PIN 6).
PIN 4: Audio input 1 from the receiver to the modem.
The modem receives signals directly
from the loudspeaker output of the receiver. The volume should not be turned up too
much. A
fairly low
volume is quite sufficient. It is better to take the AF signal from a
low level output which is independent of the volume control. These outputs are often
labeled AUX or ACC. The input impedance of the
P4
dragon is 47 kOhm. The modem
operates with an input signal down to approx. 10 mV
p-p
and should not be driven with
more than 6 V
p-p
. Is to be used in conjunction with audio input 2 (PIN 8).
PIN 5: Optional power supply input.
The modem can be supplied with power via this input.
This is especially useful if the transceiver gives a power supply output via the AUX
socket. The modem requires approximately 10 to 25 V at a maximum of 300 mA,
typically 250 mA @ 12V. Is to be used in conjunction with the ground signal (PIN 2).
PIN 6: PTT switch 2.
While transmission this output is switched to PIN 3 by an optically
isolated solid state relay. Is to be used in conjunction with PTT switch 1 (PIN 3). This
pin can be switched to ground (PIN 2) for unbalanced operation. See schematic above.
PIN 7: Audio output 2 from the modem to the transmitter.
The modem supplies a pure
audio signal to the microphone (or ACC) input of the transceiver. The output amplitude
can be adjusted with the
FSKA
and
PSKA
commands from 30 to 6000 mV (peak to
peak) open circuit. The output impedance is 600
Ω
. Is to be used in conjunction with
audio output 1 (PIN 1). This pin can be switched to ground (PIN 2) for unbalanced
operation. See schematic above.
PIN 8: Audio input 2 from the receiver to the modem.
The modem receives signals directly
from the loudspeaker output of the receiver. The volume should not be turned up too
much. A
fairly low
volume is quite sufficient. It is better to take the AF signal from a
low level output which is independent of the volume control. These outputs are often
labeled AUX or ACC. The input impedance of the
P4
dragon is 47 kOhm. The modem
operates with an input signal down to approx. 10 mV
p-p
and should not be driven with
more than 6 V
p-p
. Is to be used in conjunction with audio input 1 (PIN 4). This pin can
be switched to ground (PIN 2) for unbalanced operation. See schematic above.
For immediate connection of the
P4
dragon
to the transceiver use one of the cables you find in
the accessories catalog chapter 10 page 89. If you do not find a matching cable there, then use
the attached 8 pin DIN cable and complete it to connect the
P4
dragon
to the transceiver:
PIN Color PIN Color
1 Violet 5 Blue
2 White 6 Red
3 Yellow 7 Black
4 Green 8 Brown
Table 1: Cable Colors: 8 pin DIN cable