AR5000 OPERATING MANUAL PAGE 37
(8) SCAN - scanning memory channels
& banks
The AR5000 has a SCAN MODE whereby the contents
stored in the MEMORY CHANNELS ARE
AUTOMATICALLY RECALLED AND MONITORED very
quickly for activity - scanned. High speed scanning is
possible using Cyber Scan (a special form of scan where
the display is blanked, see section 8-9 of this manual).
It is important that you do not confuse
SCAN and SEARCH modes
SEARCH mode (covered later in this manual)
automatically TUNES THE RECEIVER THROUGH ALL
FREQUENCIES between two specified frequency limits
looking for active frequencies while SCAN is related to
memory channels.
8-1 SCAN - outline introduction to facilities
available
During SCAN the AR5000 automatically recalls each
memory channel which contains data in numeric order
and monitors them for activity. When an active memory
channel is located (when a signal is found and the squelch
is open) the receiver will temporarily stop scanning.
At default when shipped from the factory, the receiver will
remain on the active memory channels until the received
signal disappears and the squelch closes. The AR5000
will then wait a further 2 seconds in case a reply is audible
(such as aircraft and air traffic communications) then will
resume scanning the memory channels again.
If the
keys are pressed during scan or the
MAIN DIAL
rotated, the receiver resumes scanning in the
direction of the key or
MAIN DIAL
rotation. This is particularly
useful for taking a second look a channels which have
just been scanned or for forcing the SCAN process passed
unwanted busy channels.
Additional facilities available in SCAN mode include:
Memory banks may be LINKED and UNLINKED to
effectively make larger or smaller groups of memories
which may be scanned together.
CHANNEL PASS may be used whereby memory
channels can be skipped when not required (such as when
permanently busy), and may be easily reinstated at a later
time.
Another special form of scanning is PRIORITY where a
special channel (selected from one of the 1000 memory
channels) is scanned for activity every five seconds.
SELECT SCAN enables you to make a single short list of
interesting memory channels from all memory banks to
be scanned as a separate function. This reduces the need
to PASS, LINK and UNLINK banks and channels.
AUTO-STORE reserves memory bank “
0
0
0
0
0
” so that active
frequencies found while conducting a SEARCH may be
automatically written to memory (see SEARCH at section
12 with auto-store at section 12-19). This is a useful tool
for compiling an activity list of rarely used frequencies
especially when unattended.
Additional programming: It is possible to alter the
sequence of scanning events depending upon the SCAN
CONFIGURATION as defined in the
scan sub menu. There are 5 scanning parameters which
may be changed to suit your preferences and requirements
PAUSE, DELAY, L-SQ, VOICE & MODE (see section 9
of this manual). It is possible to mix combinations of all
five parameters.
8-2 Starting to SCAN, considerations
It is presumed that you have already stored your favourite
and commonly used frequencies into the memory banks
(as per section 7 of this manual).
A total of 1000 memory channels are provided which are
divided into 10 banks, each having 100 channels. The
memory banks are identified by numbers 0, 1, 2, 3, 4, 5,
6, 7, 8 & 9 and numbered from 00 to 99.
When in SCAN MODE, the memory banks are referred
to as SCAN BANK 0, SCAN BANK 1, SCAN BANK 8
etc rather than using the full title SCAN MEMORY BANK
0, SCAN MEMORY BANK 1 etc. This terminology has
been employed to make the explanation of, and referral
to SCAN MEMORY BANKS (SCAN BANKS) less
long-winded.
When shipped from the factory memory bank “
0
0
0
0
0
” is
reserved for auto-store of memory channels from search
mode so may already have frequencies stored (refer to
section 12-19 of this manual relating to AUTO-STORE).
Keep your memory banks tidy - for best scan speed
In order to achieve the maximum scanning speed, it is
advisable to keep all similar frequencies and modes
grouped together within the memory banks.
The greater the frequency change between memory
channels, then the further the receiver’s VCO (Voltage
Controlled Oscillator) has to travel and the slower the scan
rates. Similarly, when many changes of mode are
required, the extra switching which has to be accomplished
will reduce the speed of scan.
Tip: Memory channel data may be entered in duplicate
into several channels, this will ensure the channel data is
scanned more frequently to increase the chances of
activity being detected.
