NorthStar 1200-02-01, Руководство по установке

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Section Two—Installation Instructions
PAGE 22 M3 GPS INSTALLATION MANUAL Revision D
the Northstar C1 Installation Manual (Part No. GM620) for more
information.
The M3 doesn’t require any setup or initialization to work with the equip-
ment connected to serial ports. Detailed serial data specifications are avail-
able in the
Northstar Serial Data Format Specification, V1.19 Firmware,
Revision 2.2 (Part No. GM342).
Initial checkout
Installing the M3 Before inserting the M3 into the mounting tray, turn off the master avion-
ics switch or circuit breaker. Double-check all wiring for proper connec-
tions, especially power and ground.
Carefully slide the unit into the mounting tray. Unlike the Northstar M1,
the M3 will stop approximately H inch from its final position . The
mounting rod will draw the unit the remaining distance into the tray when
it’s tightened. Use a
J
-inch flat-blade screwdriver inserted through the hole
in the front panel to tighten the rod. Do not overtighten!
Preliminary
inspection and test
Move the aircraft outside and away from large buildings. Turn the avionics
master switch on, and push the M3’s
POWER
switch in to turn it on. A
series of readouts shows the status of self-tests and the acquisition of GPS
signals. The very first time the M3 is powered-up after installation, the
unit will need to download a current almanac from the GPS satellites. This
process takes about 20 minutes. If power is interrupted during this time,
the process will repeat on the next power-up. After a successful almanac
load, subsequent power-ups should take less than a minute. The following
message is displayed when signal acquisition is complete:
Checking VHF
interference
Harmonics of certain frequencies used for VHF transmissions can inter-
fere with GPS signal reception. For installations that use GPS for primary
IFR navigation, testing must be performed to verify adequate isolation
CAUTION
Make sure you do not apply primary voltage directly to the
left/right, to/from, and flag outputs of the unit; this action may
vaporize circuit-board conductors within the unit. Damage to
the unit from incorrectly wired connections is not covered
under warranty.
NAVIGATOR READY / USE ANY SWITCH