Eventide ARGUS 5000 - Heading and ADF Operation

Heading and ADF Operation
All the information displayed so far comes from the Argus and associated navigation
receiver. Additional capabilities are available by connecting ("interfacing") the Argus
to other aircraft instruments and systems. Some of these interfacing capabilities are
\^J built into the Argus, others require optional "adapters" available from Eventide.
Normally your avionics shop will take care of the details of connecting and/or installing
additional instruments or sensors. However, it is a good idea to understand the basics
so that you can confirm that your Argus has been connected as it should be, and to be
able to ask good questions or to describe any difficulties if you think it hasn't been.
Heading Interface
Aircraft HEADING is determined by a magnetic compass. The compass tells you
which way the nose of the aircraft is pointing, which is not necessarily the same
direction as the aircraft is travelling over the ground due to the wind. GPS and other
long range navigation systems will normally only give you your GROUND TRACK
(TK). The Argus can read heading information from magnetic heading instruments
such as slaved compasses and horizontal situation indicators (HSIs) providing these
- j instruments provide an output signal in "synchro" form. The Bendix/King KCS-55 is '■
one of the most popular indicators, Collins, Sperry and others also make compatible
instruments. In some cases the instruments will require an option known as a
"bootstrap." If the Argus is connected to a heading sensor and you have selected
HEADING instead of TRACK in AMEND, the map will be oriented by the heading
system instead of ground track.
ADF Interface
The direction to an NDB (Non-Directional Beacon) or other low frequency radio
source is determined by the aircraft ADF (Automatic Direction Finder). The ADF
indicator has a needle that points in the direction of a pilot-selected signal source. In
addition, the indicator frequently has a compass card behind the ADF pointer that is
oriented to the magnetic heading of the aircraft. An indicator with both the ADF
pointer and slaved compass card is called an RMI, or Radio Magnetic Indicator. This
^\_J indicator can be used to make NDB approaches. As with the heading source, the
Argus can be connected to compatible ADF receivers and can display the ADF bearing
July 1999 Argus 5000/7000 Ver. 5.xx Reference Manual Part#141003 23