2.9 OPERATION
This operation procedure presumes that the MK-12DR has been installed with the
Keep-Alive option
The Keep-Alive option maintains the last set COM and NAV Active frequencies in
their memory IC's. When the Unit is turned ON, these "active" frequencies will be
seen in the Active displays. The display's Standby frequencies will always be the
factory pre-programmed frequencies of 121.90 for COM Standby and 110.50 for
NAV Standby.
FIGURE 2-6 MK-12DR FRONT PANEL
2.9.1 COM Section Operation
COM: DISPLAY
The left side of the display identifies the COM Active COMmunications frequency,
and the letter "T" (when lit) to indicate that the Mike Key is depressed and the Unit is
transmitting.
The right side of the display identifies the COM Standby frequency.
COM: OFF-VOL-PULL TEST
OFF is the maximum counterclockwise rotation of this control. Clockwise rotation
past the "click" turns both the COM and NAV Sections ON.
VOL, once the Unit is turned ON, continued clockwise rotation increases the COM
audio volume.
NOTE: NAV AND COM SHARE THE AUDIO 50 mw OUTPUT.
PULL TEST when pulled deactivates the squelch circuit.
JUNE
1996
REV. C
10
