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Basic Operation
This section introduces the basic operating details of the
Apollo SL40 VHF Communications Transceiver.
Power
On/Off
Turn the Power/Volume control clockwise past the OFF
detent. The SL40 may be installed to be powered from
the avionics panel so the on/off control will be disabled.
Volume Turn the Power/Volume control clockwise to increase
the volume level and counterclockwise to decrease
volume.
Selecting
Frequencies
New frequencies are first selected as a Standby
frequency and then toggled to the Active side when
desired. While viewing the frequency display, use the
Large and Small knobs on the right side of the SL40 to
select the desired frequency.
1. Turn the Large, outer knob to change
the values in 1 MHz increments. The
MHz selection range is between 118 and
136 in 1 MHz steps.
2. Turn the Small, inner knob to change
the values in 25 kHz increments. The
kHz selection range is between 000 and
975 kHz in 25 kHz steps. Note that only
two digits are displayed to the right of
the decimal point.
Turn the Large and Small knobs clockwise to increase
and counterclockwise to decrease the frequency values.
Standby frequency selection is not inhibited during
transmit.
Press the Flip/Flop button to toggle the
Standby frequency to the Active
frequency.
3
Basic Operation
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