AOR AR800 Operating Manual

AR8000 operating manual
31
In normal use, the squelch control should be rotated clockwise until the
background noise is just cancelled.  This is known as “threshold” and is the
most sensitive setting for the squelch control.  Do not rotate the control too far
clockwise or only the stronger local signals will be heard.  If you find setting the
squelch control difficult, try removing the aerial from the receiver.
Should you encounter problems in setting the volume level, press the [MONI]
key on the left...

AR8000 operating manual
32
the operators preferences.
When in FUNC setting, the side panel [FUNC] key must be pressed and held
while a second keypad option is pressed.  The flashing highlight cursor “F”
indicates FUNCTION selection.  The flashing “F” indicates that the receiver is
awaiting another key entry.
When in 2ndF setting, the side panel [FUNC] key need only be momentarily
pressed then released before pressing a second keypad option.  A continually
flashing highlight cursor “F” indicates FUNCTION...

AR8000 operating manual
33
6-4  Entering a frequency through the keypad - VFO (MANUAL) MODE
& changing from VFO “A” to VFO “B” and [A=B]
The AR8000 receiver has a 2 VFO system being identified as “A” and “B” on
the LCD to the left of the frequency readout.  The term VFO historically means
“Variable Frequency Oscillator” and today refers to a tunable data store which
contains frequency, mode, step, step offset and attenuator information.
Both VFO frequencies are displayed in parallel
format on the LCD one...

AR8000 operating manual
34
Entering a frequency using the numeric keypad
Example of frequency entry 145.800 MHz
Press [1] [4] [5] [.] [8] [ENT]
There is no need to key in the trailing zeros to the
right of the decimal point as they are automatically
added by the microprocessor.
If keying in a whole MHz such as 118.000 MHz there
is no need to key in either the decimal point or
trailing zeros, they are all added by the AR8000
microprocessor.
Example of “MHz round number” frequency entry for 118.000 MHz...

AR8000 operating manual
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right of the “MHz” position, this is to ensure easy recognition of frequencies
which are often listed as “kHz” in frequency guides.  Instead, the decimal point
is positioned to the right of the kHz position
Example of frequency entry 1215 kHz (1.215 MHz)
Press [1] [.] [2] [1] [5] [ENT]
The frequency of 1215 kHz is equivalent to 1.215 MHz.  The AR8000 expects
frequency entry to be input in “MHz” format.  To convert a frequency listed as
kHz into MHz simply move the decimal...

AR8000 operating manual
36
Key in [2] to correct the current incorrect display (which is showing 81.8
MHz rather than 82.8 MHz).  Alternatively use the [DIAL] to scroll through
the digits just like a tuning dial.
When the correct frequency is displayed press [ENT] to accept the
corrected frequency data.
6-7 Changing frequency using the [UP] [DOWN] keys
The UP / DOWN keys provide a convenient method of frequency change.
The speed at which the receiver steps up or down depends upon the STEP
SIZE which is...

AR8000 operating manual
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The speed of tuning may be increased by a factor of x10 while the “F” function
legend is displayed (by using the [FUNC] key).
6-9 Changing frequency STEP size (AUTO)
The specification for channel occupancy, step (separation) and mode are
decided by and allocated by departments of Government following
International discussions.
Not surprisingly the allocation of frequency bands are not the same all over the
world and channel separation (step) varies from band to band.  As an...

AR8000 operating manual
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For example, select 118.000 MHz [1] [1] [8] [ENT] then select a 9 kHz step
size [FUNC] [2] choose “9.00” by rotating the [DIAL] and accept the selection
by pressing [ENT].
You will note the frequency has been corrected to 117.9990 or 118.0080 MHz
(depending upon the previous direction of tuning / searching) both of which are
the closest multiple of 9 kHz to 118 MHz.  On occasion the display may not
immediately update to indicate the multiple frequency in order to provide an...

AR8000 operating manual
39
1.08 kHz (which are not divisible by 50 Hz), the last digit will not be accepted so
may be corrected simply by typing [5].
In fact should you wish, even frequencies listed in the standard STEP list may
be entered directly through the numeric keypad once in the “STEP SET” menu.
For example, to program a step size of 25 kHz using the numeric keypad:
Press [FUNC] [2] [2] [5] [ENT]
The display will return to VFO mode with the new step size programmed.
6-10 STEP OFFSET facility
As...

AR8000 operating manual
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being 71.018750 MHz).  The receiver is now tuning in 12.5 kHz steps with a
step offset of +6.25 kHz.
Note: The STEP OFFSET is always in a positive direction (+) when selected
and is calculated as being HALF of the STEP SIZE.  STEP OFFSET is only
available when the step size is 10 kHz or more.
By this measure, a 25 kHz STEP size will have a STEP OFFSET of 12.5 kHz.
A 30 kHz STEP size will have a STEP OFFSET of 15 kHz.
SET OFFSET is available in VFO and search modes.  The default...