Piper ARCHER III - Page 286

SECTION 9
SUPPLEMENT 15 PA-28-181, ARCHER III
REPORT: VB-1611 ISSUED: JULY 12, 1995
9-86 4 of 6 REVISED: JANUARY 2, 2001
SECTION 9
SUPPLEMENT 15 PA-28-181, ARCHER III
REPORT: VB-1611 ISSUED: JULY 12, 1995
9-86 4 of 6 REVISED: JANUARY 2, 2001
SECTION 7 - DESCRIPTION AND OPERATION
The S-TEC ADF-650A System operates over a frequency range of 200 through
1799 kHz in 1-kHz increments. Three operating modes are included as part of
the ADF-650 System.
• BFO
• ANT
• ADF
ADF-650A Receiver, Controls, and Indicators
Figure 1
BFO Mode
The BFO (beat frequency oscillator) and ADF (automatic direction finding)
modes are navigation modes that result in pointing operation when in-range
station is selected. The ADF mode is used with conventional nondirectional
beacons and AM broadcast stations. The BFO mode is used to aurally identify
stations that employ keyed cw rather than amplitude modulation techniques.
NOTE
CW signals (Morse Code) are unmodulated and no audio
will be heard without use of BFO. This type of signal is not
used in the United States air navigation. It is used in some
foreign countries and marine beacons.
100 kHz / 1 mHz
Frequency Control
10 kHz
Frequency Control
1 kHz
Frequency Control
ON/OFF
VOL/ID
CONTROL
MODE
CONTROL
SELF-TEST
SWITCH
SECTION 7 - DESCRIPTION AND OPERATION
The S-TEC ADF-650A System operates over a frequency range of 200 through
1799 kHz in 1-kHz increments. Three operating modes are included as part of
the ADF-650 System.
• BFO
• ANT
• ADF
ADF-650A Receiver, Controls, and Indicators
Figure 1
BFO Mode
The BFO (beat frequency oscillator) and ADF (automatic direction finding)
modes are navigation modes that result in pointing operation when in-range
station is selected. The ADF mode is used with conventional nondirectional
beacons and AM broadcast stations. The BFO mode is used to aurally identify
stations that employ keyed cw rather than amplitude modulation techniques.
NOTE
CW signals (Morse Code) are unmodulated and no audio
will be heard without use of BFO. This type of signal is not
used in the United States air navigation. It is used in some
foreign countries and marine beacons.
100 kHz / 1 mHz
Frequency Control
10 kHz
Frequency Control
1 kHz
Frequency Control
ON/OFF
VOL/ID
CONTROL
MODE
CONTROL
SELF-TEST
SWITCH