Simplex operation is typically used for communicating with other aircraft, ships or emergency ground stations.
Semi-Duplex operation may be used for communications with Maritime Radiotelephone Network ground stations.
Upper Sideband Voice is the only emission mode available when using emergency channels.
Table 2 - PS440 Emergency Channels (Factory Default Programming
The following steps illustrate how to select already programmed emer-
1. Press and hold the EMER button for
approximately 2 seconds. The display will
appear as shown in Figure 10 with EMR 1
as the default channel.
2. If other than EMR 1 is desired turn the
right inner or outer knob to select the
desired emergency channel number.
Even if the selected channel has previous-
ly been programmed for semi-duplex oper-
ation, simplex operation will initially be
selected. If desired, press the ENT button
to select semi-duplex operation. SPLT will
be displayed for two seconds in the lower
part of the display. Press the ENT button
again to return to simplex operation. SIMP will now be displayed for two
seconds in the lower part of the display. Repeated pressing of the ENT
button will toggle between simplex and semi-duplex operation.
3. Momentarily press push-to-talk to tune the antenna to the new channel
4. Press the EMER button to exit the emergency channels.
Revision 0 Mar/2003
(also called Split)
Rx: 4417 Tx: 4125
Rx: 6516 Tx: 6215
Rx: 13137 Tx: 12290
Rx: 17302 Tx: 16420
KHF 1050/PS440 Pilot's Guide