AOR AR5000 Operating Manual page 23

used on any frequency within the set's range.
In normal operation AUTOMODE should be used. The
legend "AUTO" is displayed above the right hand (last)
digit of the frequency readout when automode is in
operation.
Activating AUTOMODE
To activate automode, press and hold the
more than one second. The receive mode, I.F. filter
bandwidth, step, step-adjust and frequency offset will then
be automatically read from the automode bandplan data
pre-programmed at the factory for each specific world
market area.
Manually changing any of the parameters held by the
automode bandplan data will cancel automode operation.
To reinstate automode press and hold the
more than one second again.
Selecting automode will cancel any user defined items
from the following list and select them automatically from
the AR5000 bandplan data:
Receive mode
Offset frequency
IFBW
LPF
HPF
De-emphasis
Tuning step
Step-adjust
AGC
The automode bandplan information can only be
programmed at the factory or via a specialised computer
program.
Manually changing receive mode
To change receive mode and override automode, briefly
press the key. The "
the LCD to confirm that the mode select menu has been
activated. The following modes are available from the
MODE menu: " ", "
" ".
If automode is currently in use, the legend "
be displayed on the LCD.
To escape from the menu press
key for
key for
" legend will flash on
", " ", " ", " " and
" will
The is used to change mode. When you have
made your selection, press
mode. The display will revert to VFO mode and the
AR5000 will receive in the selected receive mode.
Automode will have been cancelled and the "AUTO"
legend will not be displayed on the LCD.
Each of the five VFOs ("
can hold different modes, it is suggested that one be left
on AUTOMODE for general tuning and others set to
specific modes for specialist listening applications.
Remember: To reinstate automode press and hold the
key for more than one second.
Although any receive mode may be selected at any
frequency within the receiver's frequency coverage,
generally speaking the following modes will apply:
AM
Amplitude Modulation - Used by broadcast services
throughout the world on long wave, medium wave and
short wave. AM is also used by VHF civil airband, UHF
military airband and some PMR (Private Mobile Radio)
and utility services.
FM
There are two common types of FM (Frequency
Modulation), these are:
NFM - Narrow Band Frequency Modulation - this provides
high quality communication for relatively short distance
operation. FM uses a greater frequency bandwidth than
other modes such as SSB so is less efficient.
NFM is the most common mode used above 30 MHz with
the exception of the airbands. NFM is widely used on the
VHF bands: VHF marine band, 2m amateur band
(145MHz), 70cm amateur band (433 MHz), PMR (Private
Mobile Radio) and utilities.
In the absence of a signal, the background white noise
may appear quite loud. For ease of listening, the squelch
control should be rotated clockwise until the background
noise just disappears, this should be carried out while no
signal is present. The point where the background noise
is cancelled is known as threshold point . Do not advance
the squelch control more than necessary or the receiver
will appear to be desensitised and weaker signals will be
missed.
WFM - The AR5000 does not list WFM (Wide Band
Frequency Modulation) as a separate mode, it is simply a
product of the I.F. filter bandwidth selection. Select a wide
filter such as 100 kHz or 220 kHz and the receiver will
use WFM.
Wide Band Frequency Modulation - used by VHF and
UHF broadcast stations as excellent audio quality is
available due to the relatively wide frequency bandwidth
employed. Used only for local services such as VHF
Band-II stereo (received as mono on the AR5000) and
UHF TV sound channels.
AR5000 OPERATING MANUAL
to accept the new
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PAGE 23
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