SCS P4dragon DR-7800, Installation Manual

Page: 86 / 96

7. Connecting to a Transceiver
81
Signal
P4
dragon
Color YAESU
TxD PIN 3 yellow PIN 3
RxD PIN 8 red PIN 2
GND PIN 13 orange PIN 5
This cable is available completely assembled.
Refer to chapter
10 on page 89 .
Table 17: YAESU V24
Portable transceivers like the FT-100, FT-817, FT-857 or FT-897 use a 8 pin Mini-DIN
connection:
Signal P4
dragon
Color YAESU
TxD PIN 1 violet PIN 4
RxD PIN 9 pink PIN 5
GND PIN 13 orange PIN 3
This cable is available completely assembled.
Refer to chapter
10 on page 89 .
Table 18: YAESU 817
7.2 Assembled cables
Many modern transceivers from KENWOOD, ICOM and YAESU are equipped with a so-
called Data-Connector, which usually is a 6 pin Mini-DIN on the rear side of the transceiver.
For this connector we can supply 2 ready assembled cables, one for 9K6 and the other for 1K2
Packet-Radio operation. Refer to the list of accessories in chapter 10 on page 89.
7.3 Amplitude Adjustment
The
P4
dragon
’s 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 amplitudes are adjusted separately depending on the FSK modes (PACTOR-1) and
the PSK modes (PACTOR-2/3/4). 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 dummyload 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.