Eventide ARGUS 5000 - Page 223

ADF Detail (1 of 2)
The Argus is compatible with four different formats of ADF signal, AC SIN/COS, AC
SYNCHRO, DC SIN/COS, and DC -SIN/+COS. In order to properly interface these
different formats and voltage levels, several points should be noted.
1: The Argus measures the voltage on connector 1P1 Pin 3. This pin serves both as
an indication that the ADF is connected, and as the ADF voltage reference when a DC
ADF is being used. For the first reason, when using an AC ADF of any type, a
resistor must nonetheless be connected to this pin as shown in the drawing. If you
cannot obtain an ADF indication, verify that 1P1 Pin 3 has approximately 4.5 volts.
2: If you encounter problems with the needle rotating in reverse on DC systems, be
sure you have selected the correct type in SETUP. Do likewise if you encounter a 90
or 120 degree error in the needle indication.
3: AC Systems have a much higher voltage output than the DC systems. To avoid
overloading the Argus input, the supplied 11.8K resistors must be connected in series
with the X and Y leads.
4: In the case of AC systems, and as with the heading system, the excitation
(reference) signal must be connected and be of the same frequency and phase as the
signal driving the ADF bootstrap synchro. Refer to the heading suggestions if the ADF
needle is not displaying correctly.
If any problems are encountered with the needle pointing off by 180, 90, or 120
degrees, or rotating in reverse, it is usually some combination of incorrect X/Y Sin/Cos
wiring and improper selection hi SETUP.
July 1999 Argus 5000/7000 Ver.5.xx Reference Manual Part#141003 219