OPERATION
3-1-28
SEL-CAL mode
The SEL-CAL mode can be used to test receivers using AM Selective CALling Tones to
the selective CALling format. The mode can be selected from the
Avionics Mode Selection Menu
shown in Fig 3-1-9. Selecting
[SEL-CAL]
mode and pressing the [SIG GEN] key produces the
display shown in Fig. 3-1-24.
Fig. 3-1-24 SEL-CAL mode selection menu
The instrument operation is similar to that in non-avionics modes with a single
modulation selected (except that FM cannot be selected). Carrier frequency and AM depth can
be altered, but always default to 118 MHz and 80% respectively.
The SEL-CAL tones can be sent by pressing the
[Send Tones]
key. While the tones are
being sent
Modulation ENABLED
is replaced by the message ***
SENDING TONES
*** and the
normal modulation tone is suppressed.
The SEL-CAL code can be modified by pressing the
[SEL-CAL Code]
key to produce a
display similar to the one shown in Fig. 3-1-25. Operation of this facility is identical to that of
the
Sequential CALling Tones Utility
in non-avionics mode. The tone duration and gap can be
set but the default values are those usually used for SEL-CAL. Alternative standards can be
selected using the
[Select Standard]
key. The
[Mode Control]
key can be used to change the
mode from single shot but the default setting in always single shot.
RF
Level
Carrier
Freq.
LOCAL
AM
ON/OFF
AM
Depth
Source
Freq: F1
Avionics
Modes
Send
Tones
Select
Source
SEL-CAL
Code
Carrier :
Freq.
RF Level:
dBm
SEL-CAL Mode
Modulation ENABLED
MHz
Int Std: 10 MHz
AM :
Int F1: 1.0000 kHz
OFF
118.000 0000
-144.0
ON
80.0 %
C1133
