PAGE 26 AR5000 OPERATING MANUAL
The audio high pass filter selection is accessed via a
sub menu.
A-LPF 3.0
kHz
A-HPF 0.05
A-HPF 0.05
A-HPF 0.05
A-HPF 0.05
A-HPF 0.05
kHz <<<
DE.EMP 750
CW.PITCH 0.7
kHz
AUDIO INT
1. Press
. The LCD will first display the
low pass filter selection, press the
key to access
the high pass filter sub menu.
2. Rotate the
SUB DIAL
to make selection: 0.05 kHz,
0.2 kHz, 0.3 kHz or 0.4 kHz.
3. Press
to accept the changes,
to abort
or
to move on to the audio de-emphasis selection.
3 Audio De-emphasis
This is really only applicable to FM mode and affects the
sharpness of recovered audio. Band-II transmissions in
different world areas have different defaults for de-
emphasis, if for instance a value of 750 is selected in
Europe the recovered audio will sound very muffled.
The available range is as follows:
THRU, 25uS, 50uS, 75uS & 750uS
The audio de-emphasis will initially be automatically
selected according to the IF bandwidth:
Bandwidth Receive Mode De-emphasis
0.5k to 15 kHz FM
750uS
Above 30 kHz FM
75uS
AM,LSB,USB,CW THRU
The audio de-emphasis selection is accessed from a
sub menu.
A-LPF 3.0
kHz
A-HPF 0.05
kHz
DE.EMP 750 <<<
DE.EMP 750 <<<
DE.EMP 750 <<<
DE.EMP 750 <<<
DE.EMP 750 <<<
CW.PITCH 0.7
kHz
AUDIO INT
1. Press
. The LCD will first display the
low pass filter selection, press the
key to access
the high pass filter sub menu then press
again to
access the de-emphasis menu.
2. Rotate the
SUB DIAL
to make selection: THRU, 25uS,
50uS, 75uS & 750uS.
3. Press
to accept the changes,
to abort
or
to move on to the audio CW pitch selection.
4 CW Pitch
Comfortable listening to CW (Continuous Wave, often
referred to as Morse code) is usually centred around a
tone of 700 to 800 Hz. The audio stage of the AR5000 is
configured to emphasise this window, however the centre
frequency may be changed to suit personal preferences
or specific requirements. This function is valid only when
CW mode is used for reception.
The selectable range (pitch) is as follows:
0.4 kHz (400 Hz), 0.5 kHz (500 Hz), 0.6 kHz (600 Hz),
0.7 kHz (700 Hz) default, 0.8 kHz (800 Hz), 0.9 kHz
(900 Hz), 1.0 kHz (1000 Hz) & 1.1 kHz (1100 Hz).
1. Press
. The LCD will first display
the low pass filter selection, press the
key to
access the high pass filter sub menu, press
again to access the de-emphasis menu then press
again to access the CW PITCH sub menu.
(Alternatively press
).
A-LPF 3.0
kHz
A-HPF 0.05
kHz
DE.EMP 750
CW.PITCH 0.7
CW.PITCH 0.7
CW.PITCH 0.7
CW.PITCH 0.7
CW.PITCH 0.7
kHz <<<
AUDIO INT
2. Rotate the
SUB DIAL
to make selection:
0.4 kHz, 0.5 kHz, 0.6 kHz, 0.7 kHz, 0.8 kHz, 0.9 kHz,
1.0 kHz or 1.1 kHz.
3. Press
to accept the changes,
to abort
or
to move on to the audio internal / external
selection.
5 Input Switching
The audio path is switchable either directly to the audio
amplifier or via the front panel accessory socket (ACC 1)
where it may be looped back into the receiver for passage
to the audio amplifier after some form of external
processing has taken place (tone unit, DSP filter etc). The
default is INT for INTERNAL.
To access the audio switching menu:
A-LPF 3.0
kHz
A-HPF 0.05
kHz
DE.EMP 750
CW.PITCH 0.7
kHz
AUDIO INT <<<
AUDIO INT <<<
AUDIO INT <<<
AUDIO INT <<<
AUDIO INT <<<
1. Press
. The LCD will first display the
low pass filter selection, press the
key to access
the high pass filter sub menu, press
again to access
the de-emphasis menu, press
again to access the
CW PITCH sub menu then
again to access the
audio switching menu. (Or use the
key once !)
2. Rotate the
SUB DIAL
to make selection: INT or EXT