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PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
PRIMUS
â
II Radio System
C--26
Annunciation
Mode
BFO
ADF adds a beat frequency oscillator for
detection of cw signals.
VOICE
Maximum audio clarity and fidelity. No bearing
determination.
ADF Modes
Table C--6
Part of a dual bandwidth design, the VOICE mode transmits high
quality audio in the pilot headsets or cabin speakers. The high
quality audio comes from the wider bandwidth that is activated by
selecting VOICE. Direction finding requires narrow band reception
for bearing resolution.
NOTE:
Because the VOICE mode has a wider audio bandwidth,
it is possible to have some beat frequency interference
when listening to an ADF station within 3 kHz of another
ADF station. This interference can be eliminated by
selecting the ANT mode.
D
Frequency/Mode Select (TUNE) Knobs
-- The TUNE knobs are
used to select the ADF operating frequency (when the yellow cursor
surrounds ADF frequency line) and can also be used to select the
ADF operating mode (when the yellow cursor is surrounding the
ADF mode line.)
Turning the knob clockwise raises the frequency, and
counterclockwise decreases the frequency. The large outer knob
functions in 10 kHz increments; the small inner knob in .5 kHz steps.
Slow knob movement produces slow frequency change. Rapid
turning, causes a several step jump, proportional to twisting speed.
Large frequency changes can be tuned quickly using a quick
twisting motion.
D
ADF Frequency STO Button
-- The RMU can store an ADF
frequency. This is done by selecting the desired frequency and then
pushing the STO button on the RMU while the cursor is still on the
ADF frequency. To retrieve the stored frequency from memory, push
and hold the frequency select key for three seconds.
ADF OPERATION WITH HF TRANSMITTERS
When an HF COM is keyed, the ADF receiver freezes the ADF bearing
needles. After the HF transmits continuously for 5 seconds, the receiver
”parks”the ADF bearing needles of electromechanical indicators at a