Simrad Autopilot Compass
10 20220653 / Rev. C
3 DESCRIPTION OF MODELS
The first RFC35 Fluxgate Compass was made in 1994 for the
AP300X series of autopilots. It is today used with all autopilots
using ACXX Autopilot Computers and J3XX Junction units.
The following Simrad autopilots can use the RFC35 Fluxgate
Compass:
AP300CX, AP300PX AP300DLX, AP3000, AP3000X, AP11,
AP35, AP20, AP22, AP16, AP21, AP25, AP26, AP27, AP50.
The RFC35 range has been expanded with other models as
described in this chapter.
3.1 RFC35 Fluxgate compass
The compass comes with a 15 m cable, open end for connection
to the Autopilot Computer or Junction Unit.
RFC35 contains a (main) PCB onto which the fluxgate sensor is
mounted.
The fluxgate is a floating ring core type, which means there is no
(need for) mechanical gimbals to keep it in horizontal position
when the boat pitches and rolls.
The electronics converts the signal from the sin and cosine coils
into a pulse width modulated (pwm) signal.
This signal is transmitted on the 2-wire connection to the
autopilot, which also is the compass power supply line.
The RFC35 has automatic calibration, initialized in the autopilot
sea trial menu.
The compass will calibrate when doing a 1 1/4 turn with the
boat.
See respective autopilot manuals for details.
The calibration data and eventual offset adjustment are stored in
the Autopilot Computer/Junction Unit.
From RFC35 s.no. 7702E02 onwards and from Main PCB s.no.
10000 Rev. F onwards there are PCB connectors for mounting of
extra Rate, NMEA and SIN PCB.
See Wiring diagram, page 20 for connection details.
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