PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
PRIMUS
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II Radio System
C--8
Controls
See figure C--2 for the location of the controls and indicators described
below.
Radio Management Unit Controls
Figure C--2
D
Transfer Key
-- When pushed, the transfer keytoggles between the
active frequency (top line) and the preset frequency (second line) of
the window.
D
Line Select Keys
-- The first push of the line select key moves the
yellow cursor to surround the data field associated with the line select
key. This electronically connects that data field to the tuning knobs so
that the frequency or mode can be changed. For some functions,
additional pushes of the line select key toggles modes or recalls stored
frequencies. The line select key, if held for certain functions, recalls
automatic direction finder (ADF) and ATC memories, and enters and
exits the direct tune mode for COM and NAV.
D
Tuning Knobs
-- The tuning knobs are used to change the
frequency values or mode in the data field enclosed by the cursor.
D
Cursor
-- The yellow cursor encloses the data field selected by the
line select key. The cursor in the COM or NAV window can enclose
either the preset frequency or the memory mnemonics. Selection is
made by cycling the preset frequency line select key. The yellow
cursor ”homes”to its last position in the COM window 20 seconds
after the last tuning operation on the RMU. Home can be either the
preset COM frequency or the memory mnemonics.