SCS P4dragon DR-7800, Installation Manual

Page: 87 / 96

7. Connecting to a Transceiver
82
Don’t overdrive the TRX because in this case the signal will be spreaded by intermodulation!
With proper settings the peak envelope power will nearly be equal to the maximum output
power of the TRX. In this case the average power will approximately be the half of the
maximum power, so also continuous operation will not cause problems at all. Don’t be
confused as many modern TRX only display the peak envelope power. If it is necessary to set
the MIC-Gain value to more than half of ist maximum, it is recommended to increase the
PSKAmpl
value. This for example can be done entering <ESC>
FSKA 200
<RETURN>. If
no MIC-Gain potentiometer is available the proper PSK amplitude setting has to be evaluated
with only using the
PSKAmpl
command.
After the PSK amplitude is carefully adjusted, the MIC-Gain setting at the transceiver should
not be touched any more, otherwise it could be difficult to achieve the desired output level
for non-PSK modes.
To adjust the output level for non-PSK modes (PACTOR-I) only the
FSKAmpl
command
should be used now. Entering
U 1
<RETURN> starts the Unproto mode 1 (=100Bd FSK).
Now you have the chance to adjust the output value using the
FSKAmpl
command e.g. <ESC>
FSKA 100 <RETURN>
. Same as before, during this procedure take care for not to exceed the
ALC limit.
To prevent damage from the transceiver at continuous operation we recommend to limit the
FSK output level to half of the maximum possible, that means 50 W if the transceiver is made
for 100 W at max.
All unused wires of the TRX control cable
must not
be twisted or soldered together. All
unused wires have to be
insulated seperately
avoiding to touch each others.