AOR AR-2700 Wideband Reciever Operating Manual

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process.  Alternatively, the UP /
DOWN key may take the place of the
second [SCAN] key press.
Secondly
From “MEMORY RECALL” mode:
Press [SCAN] once holding the key for more than 1.5 seconds to
initiate the scan process.  Alternatively, the UP / DOWN key may take the
place of the [SCAN] key press.
To reverse the direction of SCAN press either the [UP] or [DOWN] key or
rotate the [DIAL].
The legend “SCAN” is displayed on the top row of the LCD to indicate that the
SCAN process has been initiated.
When SCAN has been selected, ALL MEMORY CHANNELS WHICH
CONTAIN DATA in the memory will be SCANNED irrespective of mode and
frequency.  ANY BLANK (empty) MEMORY CHANNELS which contain no data
will be ignored (skipped).
The memory bank identifier (such as “0”) will be displayed on the left of the
LCD with channel numbers changing.
When an “active” channel has been
located (busy so the squelch opens) the
scan process will temporarily pause on the
active channel and the memory location
(such as “123”) will be displayed on the
LCD.
Finally when the channel becomes clear
again (the signal disappears) and squelch
closes, the receiver will wait for an
additional two seconds (default delay) to
allow for a reply on the channel before resuming the scanning process.
To force the receiver to pause on a memory channel for about 30 seconds,
press [2ndF] [SCAN].
To cancel the SCAN process and return to the VFO’s previous frequency
without transferring the contents of the memory channel press [MANU].
9-3  Memory transfer to VFO
When stopped on an active channel or when using memory recall, press
[SCAN] to transfer the memory data (frequency, mode, step & attenuator) to
the VFO and the receiver will change to MANUAL MODE where you may tune 
						

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42
away from the channel or listen to it indefinitely until you decide otherwise.
To force the receiver to pause on a memory channel for about 30 seconds,
press [2ndF] [SCAN].
To cancel the SCAN process and return to the VFO’s previous frequency
without transferring the contents of the memory channel press [MANU].
9-4  Selecting a single memory bank to scan
The memory bank which is currently being scanned will be identified on the left
of the LCD (for example “0”) and channel number will be changing.
Should you wish to scan a different
memory bank, select a different bank
using the numeric keypad and UP /
DOWN keys.
For example, to select memory bank “1”
press [1] [UP] or [1] [DOWN].  The bank
number “1” will be displayed on the left of
the LCD and memory bank “1” will be
scanned with channel numbers changing.
9-5  Memory bank linking
When shipped from the factory using default settings all memory banks are
UNLINKED so may only be scanned on an individual basis by selecting the
scan bank identifier via the numeric keypad (“0”, “1”, “2” etc) and then pressing
the [UP] or [DOWN] keys.
It is possible to quickly link ALL memory
banks together so they will be scanned as
one group.  Alternatively it is possible to
select any number of banks to be scanned
as a group such as 1, 3, 6, 7 & 9.
To LINK memory banks for scanning the
“SCAN LINK” menu is used.  To access
the menu use the key sequence [2ndF]
[SCAN] with the [SCAN] key held for
more than 1.5 seconds.  The legends
“SCAN” “LINK” appear on the top row to
show that the menu has been selected.
The top left corner of the LCD will show
the legend “oF” or “on” (OFF or ON)
depending upon the selection of BANK
LINK.  To toggle the selection of bank link,
rotate the [DIAL] the legend will toggle
appropriately. 
						

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The left of the “oF / on” legend and lower row of the LCD provide places for all
ten scan banks.  To add more banks to the bank link list simply press the
appropriate identifying scan bank number using the numeric keypad, the
number legends will toggle On and Off... the legend “ - “ depicting Off
(unselected).
To accept the new list and setting press [ENT].
The next time the receiver enters SCAN MODE with bank link specified as On,
the legend “SCAN” “LINK” will be displayed and a group of scan banks will be
scanned together as one large group.
9-6  Scanning a memory bank which is 
not selected in BANK LINK
It is still possible to SCAN a single deselected bank by manually bypassing the
BANK LINK programming.  To SCAN 
any deselected bank simply key the
desired identifying bank number through the keypad  and press either the [UP]
or [DOWN] key.
Only the scan bank manually selected will be scanned.
9-7  SCAN channel PASS - CH PASS (lockout), general outline
Should the AR2700 stop on an active channel while scanning and for some
reason you do not wish to monitor it any longer, simply press the UP / DOWN
keys or rotate the [DIAL] to force the SCAN process to resume in the direction
selected.
However, should the receiver continually stop on the same channel you may
wish to PASS (lockout) the channel so that it will be skipped over when the
bank is next scanned.
Memory scan channels may be PASSED (locket out) either when the receiver
stops in scan mode (when they are active and the receiver has stopped
scanning) or by recalling them in memory recall mode.
9-8  Memory scan PASS while scanning
To PASS a channel when scanning, wait for the channel to become active then
press [2ndF] [8].  The legend “CH PASS” will be added above and to the left of
the LCD to indicate that the channel has been locked out and the scan process
will move on to the next channel.  This process will happen so quickly that
you will not see the “CH PASS” legend being added.  However, should
the memory channel subsequently be recalled using memory recall, the
“CH PASS” legend will be displayed to signify CHANNEL PASS.
9-9  Memory CHANNEL PASS & review using Memory Recall mode
Memory scan channels may be “tagged” for “PASS”, un-tagged or reviewed
using memory recall mode. 
						

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Press [SCAN] to place the receiver into memory recall mode.  The legend
“BANK” and “CH” appears toward the top left of the LCD to confirm selection of
memory recall mode.
The receiver will display a memory channel, mode, frequency, attenuator and
CHANNEL PASS status.
If the desired memory channel to be
PASSED (locked out) is not immediately
displayed, the UP / DOWN keys or [DIAL]
may be used to review specific memory
scan channels.  Alternatively the memory
channel location may be quickly recalled
by keying in the required location using
the keypad.
For example, to recall memory channel “123” type [1] [2] [3] there is no need
to press [ENT].  When a locked out memory channel has been selected, the
legend “CH PASS” appears above and to the right of the frequency display.
To change the status of CHANNEL PASS
(toggle CH PASS On/Off) use the key
sequence [2ndF] [8].
Lockout = “CH PASS”
         (will 
not be scanned)
Unlocked = “no legend”
          (will be scanned)
The receiver will monitor whatever memory channel is displayed in memory
recall mode when manually selected regardless of the CHANNEL PASS status.
(10)  DELAY and PAUSE facility in scan and search modes
Two user programmable timers are provided for optimising the AR2700 to suit
certain applications.  These timers are “global” and affect every scan and
search mode.
10-1  DELAY time
The DELAY parameter affects the time the receiver will remain on an active
channel in scan and search mode once the received signal has disappeared
and the squelch closed.
This is particularly useful for customising how long the receiver will wait for a
reply before continuing to scan.  For example, when communications are 
						

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passed back-and-fore between a control tower / aircraft which may take a few
seconds.  If you are scanning duplex channels then a small delay or no delay
at all may be preferable.
The limits are 0.0 to 9.9 seconds with 0.0 being interpreted as DELAY OFF.
The default is 2.0 seconds.
To access the menu to change the delay
time press [2ndF] [6].  The legend
“SEARCH SCAN” appears on the top line
of the LCD with the flashing legend
“DELAY” centrally positioned to the left of
a two digit number, at default this number
will be 2.0
The value may be changed by keying in a
two digit number via the numeric keypad
(the decimal is automatically entered by the microprocessor) or the UP /
DOWN keys or [DIAL] may be used to change the value in 0.1 second
increments.  Press [ENT] to accept the new value.
Note: Setting DELAY to 0.0 turns the delay OFF.  Under this condition,
the receiver may start to scan before the transmission has finished due
to signal level changes such as mobile flutter or signal fading.
10-2  PAUSE time
The PAUSE parameter determines how long the receiver will remain on an
“active” channel before resuming scanning channels or searching.
This is useful if you wish to gain a picture of what is happening without the
receiver being tied to a busy frequency for long periods of time (such as when
monitoring active amateur band repeaters etc).  PAUSE saves you having to
manually intervene to force the scan or search process to continue or use
PASS channels.
The limits are 01 to 99 seconds with the default being 05.  It is also possible
to switch PAUSE Off.
If the sequence [2ndF] [9] is keyed the 
global PAUSE facility will be engaged
and the legend “PAUSE” will be displayed on the LCD.  To toggle the pause
facility to Off simply repeat the key sequence  [2ndF] [9].
To program the pause delay time, key the
sequence [2ndF] [9] and hold the [9] key
for more than 1.5 seconds.  The value
may be changed by keying in a two digit
number via the numeric keypad or the
UP / DOWN keys or [DIAL] may be used
to change the value in one second
increments.  Press [ENT] to accept the
new value. 
						

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(11)  SEARCH - manual & program search banks and PASS
The AR2700 has a SEARCH mode whereby an upper and lower frequency
limit may be defined and the receiver instructed to look for activity on all
frequencies in selected step size and mode in an upward or downward
direction.
The mode and channel step will change automatically when set to the default
of PROGRAM “PROG” but data may be specified specifically if preferred.
* It is important that you do not confuse SEARCH and SCAN modes. *
SEARCH mode automatically TUNES THE RECEIVER THROUGH ALL
FREQUENCIES between two specified frequency limits looking for active
frequencies.  SCAN mode automatically recalls and monitors SPECIFIC SPOT
FREQUENCIES which have been stored into memory.
The great advantage of SEARCH over manual tuning is that it is so fast!  There
are many different options available for SEARCH mode which will be explained
in this section.
The search instructions may be programmed into banks.  There are a total of
10 programmable search banks so that data entry and recall is simple and
efficient.
Continuously active or busy frequencies such as amateur band repeaters may
be PASSED (skipped) and active frequencies stored to memory.
When the receiver stops on a genuine active frequency during search, the
[SRCH] key may be pressed to transfer the frequency to VFO where it may be
monitored for long periods of time or tuned.  Pressing [ENT] for more than
1.5 seconds will initiate the process of storing the frequency into a memory
channel.
Limitations of SEARCH mode
SEARCH mode is extremely effective for AM & NFM use in the VHF and UHF
bands.  Searching the shortwave bands is usually ineffective due to the
relatively high background and in-band noise especially when propagation
conditions are good and bands open.
11-1  Manual SEARCH
The simplest form of SEARCH is achieved by programming a frequency while
in MANUAL MODE then press and hold the [UP] or [DOWN] key for more
than 1.5 seconds.  The legend “SEARCH” and “MANUAL” will be displayed on
the LCD to indicate that a MANUAL SEARCH is in progress and the set will
start to tune upwards or downward depending upon which key had been used. 
						

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The search process takes place from the
displayed frequency using the receive
mode and step size displayed.
If the default mode of PROGRAM “PROG”
has been selected, then the receive
mode and channel step will change
automatically depending upon the
automatic bandplan data programmed
into the AR2700 during manufacture.
Example of manual search
For example, to search manually from
145.000 MHz key [1] [4] [5] [ENT] in
MANUAL mode then press and hold the
[UP] key for more than 1.5 seconds.
Changing the direction of manual searchDepending upon the key used to initiate
the MANUAL SEARCH, the receiver may
be automatically searching upward or downward.  The direction of search may
be reversed by rotating the [DIAL] or using the UP / DOWN keys.
Moving on from active frequencies
Should the receiver stop on an active frequency during manual search, you
may force the manual search process to continue by pressing the UP / DOWN
keys or rotating the [DIAL].
To cancel manual search and transfer to manual mode
To cancel manual search press [MANU], the current displayed frequency will
be transferred to the VFO frequency in manual mode where it may be
monitored or tuned.
Writing active frequencies to memory and continuing manual search
If an interesting active frequency is found while in manual search mode, it may
be written to a memory channel.
Press and hold the [ENT] key for more than 1.5 seconds to enter memory
write mode.
The legend “BANK” and “CH” will be
displayed in the upper left corner of the
LCD to confirm that memory write is in
progress.
The first available empty memory location
will automatically be offered.  To write the
frequency into this memory location
simply press [ENT]. 
						

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Alternatively you may choose a new memory location using the UP / DOWN
keys, [DIAL] or by keying in a three digit memory location.  To accept the data
and write to memory press  [ENT].
11-2  FREQUENCY PASS in search mode
It is possible to PASS frequencies (lockout - frequencies that you wish to be
skipped and not searched such as blank carriers) during manual search.
There are a total of 50 PASS channels provided by the AR2700.
PASS a frequency
To PASS a frequency during manual search press [PASS].  The frequency will
be automatically entered into the first available PASS CHANNEL and the set
will continue to search once again.
If the set fails to respond to the [PASS] key then all 50 PASS channels have
probably been used up and you will need to delete some in order to make more
channels available.
Reviewing the PASS list
To review the pass list press and hold
the [PASS] key for more than 1.5
seconds while in MANUAL or SEARCH
mode.  The legends “CH” and “PASS” will
be flashing on the LCD to indicate that the
pass list has been accessed and the first
frequency in the list will be displayed along
with it’s pass channel number “00”.
The list may be reviewed using the UP /
DOWN keys or by using the  [DIAL].
Deleting frequencies from the PASS list
A pass frequency may be deleted by first displaying the selected frequency in
the pass list then keying [0] [ENT].  The frequency will disappear and the list
will “shuffle down” to fill the gap which has been made.
Alternatively it is possible to delete the entire pass list in one go!  To achieve
this first switch the receiver Off.  Switch the receiver back on while holding
both the [PWR] and [8] keys for more than 1.5 seconds.  Release both keys
and the display will remain blank for about 2 of 3 seconds.  The receiver will
then power up as usual but the entire pass list data will have been erased.
Manually adding frequencies to the PASS list
Frequencies may be manually added to the pass list by first displaying the
chosen pass channel then keying in a frequency followed by [ENT], the
pass list will increment to the next channel.  To escape from the pass list
press [CLR]. 
						

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11-3  Program search banks
It is possible to save parameters of frequency, mode, step and attenuator into
any of the 10 program search banks for easy access at any time.
The program search banks (referred to simply as search banks) are identified
by the numbers 0, 1, 2, 3 4, 5, 6, 7, 8 & 9.
For your convenience the microprocessor (depending on world market area)
may have been pre-programmed with search banks at the factory, these being
specifically chosen for each market area.
An example of typical programming is as follows (in these examples the mode
& step are taken from the PROGRAM automatic bandplan data).  The
sequence may appear in a different order:
1 118.000   to 138.000 MHz   (Civil airband)
2 225.000   to 410.000 MHz   (Military airband)
3 410.000   to 425.000 MHz   (USAF)
4 156.000   to 163.000 MHz   (VHF marine band)
5 88.000     to 105.000 MHz   (BAND 2 broadcast)
6 145.200   to 145.775 MHz   (2M amateur band)
7 433.000   to 433.600 MHz   (70cm amateur band)
8 1297.000 to 1298.000 MHz   (23cm amateur band)
9 71.000     to 87.000 MHz   (Low band PMR)
0 163.400   to 225.000 MHz   (VHF PMR)
Starting program search
Assuming that the AR2700 
is pre-programmed with similar data to that shown
above, to initiate PROGRAM SEARCH press [SRCH].  The legend “SEARCH”
appears on the top row of the LCD to confirm selection.
To select a specific search bank press the
key corresponding to the desired search
bank identifier.  For example, to search
bank “3” press [3] while in search mode.
The lowest frequency in the bank will first
appear on the LCD and will change in an
upward direction.  Use the UP / DOWN
keys or  [DIAL] to reverse the direction of
search.
Forcing the program search passed busy frequencies
Should the receiver stop on an unwanted active frequency, press the
 [UP] / [DOWN] keys or [DIAL] to force the search process to continue.
* Also refer to section 11-2 of this operating manual (frequency pass). 
						

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To cancel program search
To cancel program search press [MANU] and the display will return to the
original VFO frequency in MANUAL mode.
Transfer of an active frequency to VFO
Should the search process stop on an interesting active frequency, you may
stop the search process and transfer the frequency to VFO by pressing
[SRCH].
The receiver will monitor the active frequency and may be tuned using the
[DIAL] or UP / DOWN keys.
Writing active frequencies to memory
If an interesting active frequency is found while in program search mode, it
may be written to a memory channel.
Press and hold the [ENT] key for more than 1.5 seconds.  The AR2700 will
enter MEMORY WRITE MODE, the legends “BANK” and “CH” will flash to
indicate that the receiver is expecting you to accept the memory location or
choose a new location.  Initially the first available empty memory channel will
be offered.  If you prefer to store the data into a different memory channel use
the UP / DOWN keys, [DIAL] or numeric keypad to make a new selection.
The accept the memory location and write
data to the chosen memory location press
[ENT].
Note: The receiver will return to
PROGRAM SEARCH MODE but will start
at the lowest frequency of the program
search range and start searching again.
For this reason it is recommended that
only a relatively small range of frequencies
are searched / analysed at any time.  If this proves a nuisance, then use
MANUAL SEARCH mode so that the search process continues from the
currently displayed frequency.  Refer to section 11-1 of this operating manual.
11-4  Reviewing program search upper and lower limits
It is very easy to review the upper and lower frequency limits or program
search banks to make their identification easier.
When in program search mode (the
“SEARCH” legend displayed on the LCD)
press [2ndF] [SCAN] to review the upper
and lower limits of the program search
banks.  This method is preferable to the
PROGRAM SEARCH MENU as you
cannot accidentally over-write the program
search bank contents.