3 Installation
outputs are often labeled AUX or ACC. The input impedance of the PTC is 47
kOhm. The PTC-IIIusb operates with an input signal down to approx. 5 mV
RMS
and should not exceed 1 V
RMS
.
PIN 5:
Optional power supply input.
The PTC 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 PTC-IIIusb requires approximately 10 to 20 Volts DC at a
maximum of 500 mA.
PIN 7:
Not connected.
PIN 6:
Not connected.
PIN 8:
Not connected.
For immediate connection of the PTC to the transceiver use one of the cables you find in
the accessories catalog chapter
.
Use the attached 8-pole DIN cable to connect the PTC-IIIusb to the transceiver:
PIN
Color
PIN
Color
1 Violet 5 Blue
2 White 6 Red
3 Yellow 7 Black
4 Green 8 Brown
Table 3.1: Cable Colors: 8-pole DIN-cable
The socket is wired as follows (Viewed from the rear of the PTC-IIIusb).
8
7
2
6
5
4
3
1
Pin 1:
Audio output from the PTC to the transmitter.
Pin 2:
Ground.
Pin 3:
PTT output. (to transmitter PTT line)
Pin 4:
Audio input from the receiver to the PTC.
Pin 5:
Optional power supply input.
Pin 6:
Not used.
Pin 7:
Not used.
Pin 8:
Not used.
Figure 3.2:
Connection to the transceiver.
NOTE:
Unfortunately, there are 8-pole plugs with different pin numbering for the PINs 7
and 8. The PTC-IIIusb needs an 8-pole plug with U-shaped contact footprint. Plugs with
circular contact footprint don’t fit or can only be connected to the PTC-IIIusb with
damaging force! One should not blindly rely on the printed numbers on the plug. The
connections as shown here in the handbook should be used as a reference.
The 8-pole DIN socket is mechanically designed that a 5-pole DIN plug (180
0
) may be
plugged into it too. It is possible to use a 5-pole DIN plug if an 8 pin is not available. If a
5 pin DIN plug is used, then the connections are as shown:
16