SCS Pactor, Руководство по установке

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3. Installation
are not acceptable. The PTC filters the signal optimal with the integrated DSP and requires
no “external help”.
•
Noise blanker and notch filter should be switched off.
The PTC is connected to the transceiver via an 8 pin DIN socket (HF-Transceiver Audio).
PIN 1: Audio output from the PTC to the transmitter. The PTC 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 3000 mV (peak to peak) open
circuit. The output impedance of the PTC is 1 k
Ω
.
PIN 2: Ground (GND). Collective ground for all signals.
PIN 3: PTT output. While transmission this output is grounded by the PTC, so that virtually
all modern transceivers are usable. A VMOS power transistor is used as switch, which
gives optimum results.
PIN 4: Audio from the receiver to the PTC. The PTC received 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 PTC is 47 kOhm. The PTC operates with an
input signal down to approx. 10 mV
p-p
and should not be driven with more than 2 V
p-p
.
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 requires approximately 10 to 20 V at a maximum of 500 mA, typically
200 mA.
PIN 7: FSK output from the PTC to the transmitter (PTC-IIpro only). When using the
modes PACTOR-I, AMTOR and RTTY, an additional FSK keying output is available.
This may be connected to the FSK input of the transmitter (often labeled as RTTY).
The PTC-IIpro output uses TTL levels. High is equivalent to Mark, low is Space.
PIN 6: A1 (not PTC-IIex)
General purpose switch output (can e.g. be used to control an antenna switch). When
active, the output is switched to ground (open Drain).
PIN 8: A0 (not PTC-IIex)
General purpose switch output (can e.g. be used to control an antenna switch). When
active, the output is switched to ground (open Drain).
For immediate connection of the PTC to the transceiver use one of the cables you find in the
accessories catalog chapter 5 page 52. If you do not find a matching cable there, then use the
attached 8 pin DIN cable and complete it to connect the PTC to the transceiver:
PIN Color PIN Color
1 Violet 5 Blue
2 White 6 Red
3 Yellow 7 Black
4 Green 8 Brown
Table 2: Cable Colors: 8 pin DIN cable
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