3 Installation
19
- For HF and 1k2 Packet-Radio:
Signal PTC Color YAESU
GND PIN 2 white PIN 2
PTT PIN 3 yellow PIN 3
AF-OUT PIN 1 violet PIN 1
AF-IN PIN 4 green PIN 5
This cable is available completely assembled.
Refer to chapter 16 on page 193.
Table 3.9: YAESU 6 pin Mini-DIN
- For 9k6 Packet-Radio:
Signal PTC Color YAESU
GND PIN 2 white PIN 2
PTT PIN 3 yellow PIN 3
AF-OUT PIN 1 violet PIN 1
AF-IN PIN 4 green PIN 4
This cable is available completely assembled.
Refer to chapter 16 on page 193.
Table 3.10: YAESU 6 pin Mini-DIN
3.5.4 Amplitude Adjustment
The PTC-IIIusb output amplitude has to be adjusted very carefully to the connected
transceiver. If you don’t pay attention on this item a signal much too wide will be the
result!
The output amplitude are adjusted separately depending on the modes FSK (PACTOR-1,
AMTOR, RTTY, etc). and the modes PSK (PACTOR-2). A common adjustment with one
command was in practice not the best way.
The audio input sensitivity of most transceivers is adapted to the output voltage of a
common dynamic microphone. 100 % modulation is reached at low MIC-Gain settings
with 200 mV (Peak to peak) input voltage. It is not recommended to use very high
PSKAmpl values and compensate this by lowering the MIC-Gain setting, because this
may already overdrive the first amplifier stages which are very sensitive and located in
the signal path before the MIC-Gain controlling device. We recommend for the first
approach to use the default PSKA value of 140 and then regulate the output power for
PSK with the mic-gain setting (if available). To do this connect the TRX to a dummy load
resistor capable to dissipate the power or to an antenna with good SWR (Take care that
the frequency being used is not already occupied). Entering U 3 <Return> starts the
Unproto mode 3 (=100 Bd DBPSK). Now you can use the MIC-Gain knob to increase the
transmitting power until the ALC voltage reaches the allowed limit.
Don’t overdrive the TRX because in this case the signal will be spreaded by
intermodulation!
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