AOR AR8000 Operating Manual page 68

Either use the [DIAL] to change the value or key in a two digit number through
the numeric keypad. [0] [0] is accepted as 00 seconds (OFF) and [4] [1] as 41
seconds.
To accept the changes to FREE scan press [ENT] to return to SCAN mode.
Alternatively you may move to the next option (LEVEL SCAN) by pressing the
[DOWN] key.
SCAN - LEVEL scan
The LEVEL scan causes the receiver to check the signal strength of "active"
channels and to only stop when the signal strength is above a predetermined
level which is programmable in 7 steps plus OFF.
The limits are 0 to 7 levels with 0 being interpreted as LEVEL scan OFF.
Note: It is possible that false signal levels may upset the operation of
LEVEL scan due to local noise or the close proximity of computer
systems.
Either use the [DIAL] to change the value or key in a one digit number through
the numeric keypad. [0] is accepted as 0 (OFF) and [4] as level 4.
To accept the changes to LEVEL scan press [ENT] to return to SCAN mode.
Alternatively you may move to the next option (MODE SCAN) by pressing the
[DOWN] key.
SCAN - MODE scan
The MODE scan parameter determines whether ALL specified memory
channels will be scanned or only those of a certain receive mode.
This can be very useful if for example you have a mixture of VHF AM Civil
airband frequencies in a memory bank along with VHF NFM Marine. Rather
than having to scan ALL channels or PASS (lock out) certain channels, a
particular mode ONLY can be quickly selected and scanned.
The options available are: ALL (ALL modes), WFM, NFM, AM, USB, LSB &
CW. Setting the option to "ALL" will cause the scan process to stop on all
"active" channels regardless of mode.
Rotate the [DIAL] to change the option. To accept the changes to MODE scan
press [ENT] to return to SCAN mode.