AOR AR7030 Operation Information Manual

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 1
Additional operating information for
FPU7030 and NB7030 options.
1Contents
2 Introduction and options ………………….. 1
2-1 Overview
2-2 Memory idents
2-3 New timers
2-4 Noise blanker
2-5 Notch filter
2-6 Menu structure
3 Configuration menu ………………………… 3
3-1 New entries
3-2 Setting up the NB7030 option
4 Memory extensions ………………………… 4
4-1 More memories
4-2 Text identification
4-3 Ident preview
4-4 Ident search
4-5 Memory editor
4-6 Memory indexing
5 Timer extensions …………………………… 6
5-1 Setting the clock time and date
5-2 Timer operation
5-3 Setting the timers
6 Noise blanker operation …………………… 7
6-1 Option configuration
6-2 Noise blanker operation
6-3 Noise blanker menu
7 Notch filter operation ………………………. 7
7-1 Option configuration
7-2 Notch filter operation
7-3 Notch filter menu
8 Option specifications ….………..…………. 8
2 Introduction and Options
2-1 Overview
This supplement to the AR7030 Operating Manual covers
the functional changes and extensions that are due to the
enhanced processor (FPU7030). The enhanced processor
is required to operate the Notch Filter and Noise Blanker
options, but a receiver without the NB7030 option board
may still use the enhanced processor to gain extra
memory and timer functions.
The standard AR7030 manual covers the operating
principles of the receiver and these remain largely
unchanged with the enhanced processor. New users
should use the standard manual to become familiar with
the set, referring to this supplement if there seems to be a
discrepancy between the manual and the receiver’s
behaviour. Experienced users should find that the new
features fit quite seamlessly into the operating method,
although some functions may have moved or require an
extra button press now.The next few sections give an outline of the new features
and the terms used for them. Of particular relevance is a
new menu structure diagram (section 2-6
) which replaces
diagram 2-4
 in the standard operating manual.
2-2 Memory idents
The receiver’s memory capability is increased to 400
memories each storing frequency, mode, filter, PBS, AGC
and squelch settings. Additionally each memory can store
a textual identifier (up to 14 characters long) to aid station
identification. A new memory editor function using the
usual copy and paste operations is incorporated to make
management of the frequencies and identifiers easy. Two
extra features can be added to the receiver’s normal
operation making use of the text identifiers :-
1)Ident Preview
 displays the text ident for three
seconds whenever a memory is selected or previewed.
2)Ident Search
 checks the frequency stored in all of the
memories for a close match to the currently tuned
frequency and, if one is found, displays the appropriate
text ident for 10 seconds.
2-3 New timers
The clock in the receiver has been extended to include
date and month, and ten, one-year timer memories have
been added. These multi-timers will recall a specified
receiver memory at the start time and then run the
receiver for a given period allowing unattended recording
of several programs from several stations.
2-4 Noise blanker
The impulse noise blanker operates in the IF system of
the receiver to reduce the effects of short-duration noise
pulses. W ith adjustable threshold and two selectable
blanking periods the NB7030 will cope with a wide range
of noise and signal conditions. Most importantly, the
noise blanker reduces the effect of noise spikes on the
receiver’s AGC system, preventing it quietening after a
spike. Additional audio control circuits in the noise
blanker allow successful operation in AM and Sync
modes as well as SSB and CW .
2-5 Notch filter
The audio notch filter in the NB7030 is manually tuneable
from 150Hz to 6kHz and will typically offer more than
50dB of rejection to unwanted heterodynes. A variety of
automatic facilities are incorporated to make the notch
quick and easy to use - the tuning rate slows down when
a signal is detected close to the notch frequency reducing
the chances of tuning through and missing the signal,
and a signal tracking facility is available that will finish the
fine tuning after coarse manual tuning. This will also track
wandering heterodynes or move the notch with the
receiver tuning in SSB and CW  modes (provided the
receiver is tuned slowly). A fully automatic notch search
form 300Hz to 6kHz can be started, with the notch
settling on the first steady heterodyne it finds.
AR7030 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 2
2-6 Menu structure
AM, Sync,
SSB m odes
NFM modeCW, DATA
modesF ilte r
num ber
BFO
value
Squelch
muting
Bass
le v e l Notch
search
AGC
speed
AGC
speed
A / B
sw apNB
width
S quelch
hold
Squelch
hold
Te x t
edit
Save
ident Memory
recall
Scan
on / offTun ing
lock RF-IF
menuFilter
menu
Dual
watch
Memory
store
Stop
channel Memory
menu Passband
shift
Passband
shift
Squelch
le v e l
Treble
le v e l Notch
tune
IF
gain
IF
gain
Squelch
le v e lNB 
le v e l
Watch
delay
Scan
delay
Memory
channel
Character
select
M u lti-tim e r
num ber Memory
channel
Squelch
le v e lC opy
A to BNB
on / offNotch
on / off
Squelch
muting
Scan
exclude
Start
channel Squelch
mutingF ilte r
bandwidth
Copy &  paste
frequency / ident
Text cursor
positionIdent
hide
Arm
tim e r
Arm
tim e rSleep
mode
Tim r
menu
Recall
memoryRun
ti m e Set timer run time
Set timer
start time
Set m ulti-timer
start timeS e t m u lt i- tim e r
date Set clock time Set clock date
Configuration
Aux relay
A u x ou tp u t lev e ls
Sync detector
Filte rs : RF atten / preamp
Notch auto tune
Mem text ident
Options installed
Memories :ChoicesOff / timer / squelch
Left  / right: 0 to 99%
A u to / w id e / n a rro w
Auto / manual
O n  / o ff
Preview / auto
Ye s / n o
Start re-index
Start calibrateF ilte r
bandwidthF ilte r
bandwidthF ilte r
bandwidthF ilte r
bandwidthS - m e te r
display
Te x t I d e n t
from mem search Previously
selected menu
Ident
SelectPrevious
menu
Left side m enu Right side m enu
RF Atten
and Preamp
F6? >2
CSQ^=_bU
CUde`
Dhd
DY]b5TYd
3^VWDY ]U
=d]b
DY]U 3\_S[D_^U >dSX
7QY^ =5>E =5>E
69
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 3
3 Configuration menu
3-1 New entries
The configuration menu is described in the AR7030
Operating Manual section 9-4
. W ith the enhanced
processor there are several new settings in the menu to
cope with new options and functions.
The list of configuration settings is shown below - new
item s are m arked  „ .
Item Settings
SelectNone (Modify is informative)
„Notch auto tune: Off On
„Ident preview: Off On
„Ident auto search: Off On
Aux relay: Off Timer Squelch
Aux output muting: Off On
Aux o/p (L): 0%  to  99%
Aux o/p (R): 0%  to  99%
„Leap year counter: 0  to  3
„Notch option: No Yes
„NB option: No Yes
„RF Atten step: 10dB 20dB
Sync detector: Auto Narrow Wide
RF Gain: Auto Man
„Memory re-index: Start
Filter calibrate: Start
Details of the settings are as follows:-
Notch auto tune:  If turned On then the notch filter will
centre on a signal and follow small changes in frequency.
If turned Off then the notch filter is only manually tuned.
The notch auto tune on/off setting is stored in the A, B, C
Setup memories and the default is Off.
Ident preview:  If turned On then memory text identifiers
will be displayed for 3 seconds whenever memories are
selected or previewed. This acts in any relevant menus
where m em ories are involved. Preview is disabled if this
is turned Off. The ident preview on/off setting is stored in
the A, B, C Setup memories and the default is Off.
Ident auto search:  If turned On then a memory
frequency search is performed whenever tuning stops and
if a match is found a text ident will be displayed. Setting
this Off disables the automatic search but pressing the
[MENU] button will still start the search manually. The
ident auto search on/off setting is stored in the A, B, C
Setup memories and the default is Off.
Leap year counter:  This counter is advanced every year
and is used by the clock to insert a leap day every four
years. If its value is zero then February will have 29 days,
so the value is best thought of as being the number of
years since the last leap year. If the current year is a leapyear then the value should be zero. If necessary, use the
[RF-IF] or [FILTER] buttons to change the counter value.
Notch option:  This setting tells the receiver’s control
system if the notch filter menus and configuration are to
be used. If the NB7030 is not installed then it should be
set to No.
NB option:  This setting tells the receiver’s control
system if the noise blanker menus and configuration are
to be used. If the NB7030 is not installed then it should be
set to No.
RF Atten step:  Included for compatibility with future
options. MUST BE SET TO 20dB.
Memory re-index:  Pressing Start will re-index the
frequency memories for the ident search operation - this
takes about 6 seconds. See section 4-6 for details of
when it is necessary.
3-2 Setting up the NB7030 option
Two of the configuration settings are to do with the
installation of the NB7030 notch filter / noise blanker
option board. The Notch option and NB option settings
should both be set to Yes if the NB7030 board is
installed. If either of the settings is No then the menu to
operate the option will not be available on the receiver’s
display.
To access the configuration menu, press the 
[Oz
z] button
if the Edit / Timr / Cnfg menu list is not displayed, then
press the button under Cnfg
. Use the spin-wheel to select
the Notch option
 and NB option
 entries (turn the control
about 1/3 turn clockwise).
Press the right menu button (under the Yes
 or No
) to
change the setting.
Config Menu settings with NB7030 installed:-
Notch option: Yes
NB option: Yes
Config Menu settings with NB7030 absent:-
Notch option: No
NB option: No
Press the 
[MENU] button or the [Oz
z] button to return to
the normal receiver display.
It is quite acceptable to have one option On
 and one Off
if only part of the NB7030 is required. This removes the
unused option menu from the receiver menu system.
NOTE     NOTE     NOTE     NOTE
Note:
  If the NB7030 is NOT
 installed then setting either
the Notch option
 or the NB option
 to Yes
 will result in
NO AUDIO OUTPUT
 from the receiver. This condition will
not be remedied with a Default Set
 operation, the only
way to restore operation is to make sure that both options
are set to No
. 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 4
4 Memory extensions
4-1 More memories
Memory capacity is extended to 400 frequency memories.
The extra m em ories are exactly the sam e as the first 100
except that the range of memory numbers is extended
from 000 to 399. See the operating manual, section 8
.
All of the memories can be selected using the spin-wheel
in one of the memory menus but because it takes a long
time to step through 400 memories, using the infrared
controller is recommended. Memory numbers can be one,
two or three digits long, leading zeros are optional. The
first digit of a three digit memory number can be 0, 1, 2 or
3. If a number higher than 3 is entered, 3 will be
assumed.
The memory scanning system is restricted to any group
of 100 memory channels - in other words the “hundreds”
digit of the memory number will not change when
scanning. By allocating a few memories in each group for
scanning this allows up to 4 scanning sets to be used
without re-programming the scan setup.
See the operating manual section 8-4
 for scanning
details. The first and last scan channels are set up as
described, the “hundreds” digit for the scan is taken from
the current memory number - it can be changed by
keying in a memory number from the infrared controller
or going back to the MEMORY menu and using the spin-
wheel.
4-2 Text identification
Each memory can have a text identification added to
make selection easier and help you keep track of what is
stored. Each ident can be up to 14 characters long - any
characters, letters, numbers and symbols can be used.
All idents are entered or changed using the memory
editor.
W henever a new frequency is stored in a memory the text
ident in that memory is cleared (set to a blank ident) so
that a new frequency is not labelled with an old ident. An
exception - if the new frequency is within 1.5kHz of the
frequency previously stored in the memory in which case
the ident is left unchanged. This allows mode or filter
changes or slight shifts to PBS or tuning to be made and
re-stored without loosing the ident text. Additionally, the
store frequency operation in the memory editor does not
affect any ident text so this is more suitable for changing
m em ory frequencies when the ident needs retaining.
4-3 Ident preview
The idents can be displayed whenever m em ories are
selected in which case the receiver’s tuned frequency is
replaced with the ident text for three seconds after the
memory number is changed. Blank idents are not
displayed, and the tuned frequency is re-displayed
immediately if the receiver is tuned. The text ident is also
displayed when the 
[PREVIEW] button on the infrared
controller is pressed.
The ident preview facility can be turned on or off using the
Ident preview:
 setting in the CONFIG menu (see section3.1
) and this setting is stored in each of the setup
memories A, B and C.
4-4 Ident search
The ident search facility can be initiated automatically or
manually. In automatic mode, whenever the receiver’s
frequency is changed (after tuning or a memory recall)
the set searches through all the 400 memory channels for
a similar frequency entry (within about 1.5kHz of the
tuned frequency). If a match is found then the text ident
for that memory is displayed for 10 seconds.
Idents found during a search are displayed where the s-
meter is normally shown, and the ident search only
operates when the s-meter is displayed (so that it doesn’t
obscure any menu text). The three menu buttons below
the ident text operate as if the s-meter was shown.
Manual search for a matching memory is started by
pressing the 
[MENU] button when the s-meter is
displayed. Any idents found will displayed along with the
memory number (at the top left) until another button is
pressed. In fact the 
[MENU] button should be thought of
as switching between s-meter and idents.
The search starts at memory 000, finds the first matching
memory frequency and displays that ident. If there are
several memories with the same frequency stored (for
example a shared channel) the turning the spin-wheel
under 
 will cause the search to continue forwards or
backwards and find any more matches. If no more are
found then No Ident
 is displayed at the top left.
Pressing the 
[Back] button will return the left hand menu
to its previous state, leaving the ident displayed. The
ident will revert to s-meter if the receiver is tuned.
The automatic ident search facility can be turned on or off
using the Ident auto search:
 setting in the CONFIG
menu (see section 3.1
) and this setting is stored in each
of the setup memories A, B and C.
4-5 Memory editor
The memory editor is a new feature of the enhanced
processor and allows memory data to be moved and
copied around the 400 memories. The editor is also
where text identifiers can be entered or changed.
To start the memory editor, go to the SETUP menu
(press the 
[Oz
z] button if necessary) and then press [Edit].
The number of the memory being edited is displayed
above, and can be changed by, the spin-wheel. Its
frequency and text identifier is displayed on the top line of
the LCD. Memory numbers can also be entered from the
infrared controller using either the 
[PREVIEW] or [MEM]
buttons. [MEM] will recall the memory and tune the 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 5
receiver (as usual) whereas [PREVIEW] will just setup the
new memory number in the editor.
The editor allows memory information to be copied (and
moved) using the Copy
 and Paste
 operations. Pressing
the 
[Copy] button duplicates all of the memory’s contents
in a background store (in computer parlance, a
clipboard). Subsequently this information can be
duplicated into a memory by pressing the 
[Paste] button,
overwriting the memory contents.
The Copy
 operation always duplicates all of the stored
information into the background store, but the Paste
operation can be set to duplicate everything or just the
text identifier. The right hand menu button cycles around
three possibilities :-
Id
y
yDuplicates only the text identifier, leaving the
memory’s frequency unchanged.
Fy
yIDuplicates both frequency and identifier.
Fry
yOperates on only the memory frequency,
leaving ident unchanged.
In the last case the Copy and Paste legends are replaced
with Rcl and Store because the memory frequency is
transferred directly to and from the receiver settings -
allowing mode and filters to be changed if required. If the
infrared controller is used for this then there is no need to
leave the editor. In the context of the m em ory editor,
“frequency” refers to all of the stored receiver parameters
- frequency, mode, filter, PBS etc.
There is no direct way to clear the contents of a memory,
but if this is required then store a frequency of zero in the
memory (tune the receiver to 000.00 and then use the
[STORE] button on the infrared controller or [Sto] from the
MEMORY menu). This will remove the memory from any
ident search and scan sequence, and also clear the text
identifier. If you clear several memories in this way it is
beneficial to run the Memory re-index operation from the
CONFIG menu to improve the efficiency of the ident
search.
Pressing the 
[Txt] button changes to the text identifier
editor.
The memory identifier is displayed with a flashing cursor
which can be moved left and right using the two < Pos >
buttons. The character at the cursor position can be
changed by turning the 
[Char] spin-wheel to enter newidents or edit existing ones. The character sequence is as
follows :-
CapitalsA  to  Z
Symbols[  ¥  ]  ^  _  ´
Small lettersa  to  z
Symbols{  |  }  Æ
Æ  Å
Å  (space)
Symbols!  “  #  $  %  &  ’  (  )  ‘  +  ,  -  .  /
Numbers0  to  9
Symbols:  ;  <  =  >  ?  @
W hen the text identifier is complete as required pressing
the 
[Save] button will write it into the memory and return
to the memory editor. If you do not want to save the new
ident then press the 
[MENU] button or the [Oz
z] button to
exit from the editor.
Text Idents can be Hidden which means that the ident
search will not display them. This is useful if several
memories have the same frequency but you only want to
display one of the idents - the unwanted ones can be
hidden. Ident preview ignores the hidden status.
All idents beginning with an asterisk ‘ are Hidden. The
[Hide] button in the text editor will insert or remove an
asterisk from the beginning of the text (but the 14th
character will be lost if it is not blank).
Press the 
[MENU] button or the [Oz
z] button to leave the
memory editor and return to the normal receiver display.
4-6 Memory indexing
To enable the receiver to search all 400 memories quickly
an indexing system is used where an abbreviated
frequency is stored. In normal operation of the receiver
the index is automatically kept up to date whenever new
frequencies are stored in memories. Under certain
circumstances the index update can be bypassed which
means that the receiver will not be able to find matching
memory frequencies. To overcome this there is a memory
re-index operation (in the CONFIG menu, see section 3.1)
which will index all 400 memories. This takes 5 to 6
seconds.
Re-indexing is only required when the indexes have not
been updated. This will occur when a receiver is first
upgraded from standard to enhanced processor - the old
100 memories are retained and incorporated into the first
100 memories of the new system. The same thing
happens if the memories are downloaded from a
computer using software intended only for the standard
AR7030. Operating the memory re-index after the
memories have been loaded will ensure correct operation. 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 6
5 Timer extensions
The timer and clock menus have changed slightly from
those on the standard AR7030 which are shown in the
operating manual. The button labels and functions are
still the same, but the button positions have moved to
give room for the extra timer functions.
The 
[+Hr] button on the TIMER menu has been removed.
5-1 Setting the clock time and date
The clock setting now includes date and month as well as
time. See section 9-3
 in the operating manual in
conjunction with the following extra information.
The clock time, Hrs
 and Mins
, are set by turning the
spin-wheel, with the ‘
 button switching between them.
The date and month can similarly be altered by pressing
the button below them and using the spin-wheel. After
setting the date and / or month the hours / minutes
display can be restored by pressing the 
[Hrs] button.
The date can be set between 01 and 31 irrespective of the
month. Silly dates, such as 31 Apr, will be corrected at
midnight when the “next” day starts.
The clock has a four-year cycle to cope with leap-years.
The year counter can be set from the CONFIG menu (see
section 3-1
), but it is unlikely to need changing.
Pressing the 
[Back] button returns to the TIMER menu.
5-2 Timer operation
The enhanced processor provides ten Multi-timers which
can operate over a 1 year period. The Multi-timers will
only switch the set on from its standby state (ie with
external power applied and just the clock displayed) and
are ignored the set is already on or if power is not present
at switch-on time.
Each timer has a memory which stores the start time and
date, the running time in minutes, the receiver memory
channel that holds the frequency to receive and a flag
that marks it as active or not. W henever a timer switches
the radio on its flag is set to inactive so that the timer
event will not happen again (a year later). All other
settings in the timer remain unchanged, so to record a
weekly program only the date would need editing, and the
timer making active again.
The standard 24-hour timer described in the operating
manual (see section 9-2
 in the operating manual) will
operate in conjunction with the Multi-timers provided that
it is the first timer to switch the radio on. If timer operation
is needed when the set is powered from  internal battery
then the 24-hour timer must
 be used.
The start times can be in any timer memory - the radio
will automatically use the earliest time first. An Mtmr
active
 message is displayed when the radio is in standby
mode to indicate that one or more of the timers is active.
5-3 Setting the timers
To set the Multi-timers, go to the SETUP menu (press the
[Oz
z] button if necessary) and then press [Timr] and [Mtmr]
to select the MULTI-TIMER menu.
Turning the spin-wheel selects the Multi-timer memory,
shown as T:0
 through to T:9
. The receiver frequency that
the timer will use is shown at the top left, along with the
memory number (in the centre of the display) and the
running time (in minutes). At the right of the display the
Act
y
y
 bullet shows weather the timer is active (solid bullet)
or inactive (hollow bullet).
To change the receiver memory that the timer will use,
press the button underneath the memory number and
then use the spin-wheel or key in the number and press
[MEM] on the infrared controller.
Similarly to set the run time, press the button under the
run time display and use the spin-wheel. To return to the
previous menu press the ‘
 button under the timer
memory number.
The timer start time can be set after the 
[Time] button is
pressed.
The start time, Hrs
 and Mins
, are set by turning the spin-
wheel, with the ‘
 button switching between them. The
date and month can similarly be altered by pressing the
button below them and using the spin-wheel. After setting
the date and / or month the hours / minutes display can
be restored by pressing the 
[Hrs] button.
The date can be set between 01 and 31 irrespective of the
month. Silly dates, such as 31 Apr, will not switch the set
on because they will never match the clock date.
The 
[Back] button returns to the MULTI-TIMER menu.
Remember to check that the correct timer(s) are active
before leaving the MULTI-TIMER menu by pressing the
[MENU] button or the [Oz
z] button. 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 7
6 Noise blanker operation
6-1 Option configuration
The noise blanker option has to be installed and
configured before the following features and menus are
available. Section 3-2
 details the CONFIG menu entry for
the noise blanker option. There is only this one item to
set.
6-2 Noise blanker operation
The impulse noise blanker works by detecting rapidly
rising signals (typically noise spikes) that exceed a
certain threshold level and then muting the output of the
receiver for a short period to remove the noise spike.
Because the noise blanker uses a wider bandwidth than
the other filters in the receiver it is able to apply the
blanking pulse before the noise spike reaches the output
and therefore remove it completely. Also because the
blanking is done in the IF stages it is possible to prevent
the noise from quietening the receiver by AGC action.
The trigger level for the blanker can be adjusted to suit
signal conditions. If it is set too high then some noise
spikes will not operate the blanker and will appear at the
output. If set too low then the signal itself will be
perceived as noise and some information may be lost.
The default setting is 46% which is a good starting point.
Adjust up or down depending on what it sounds like.
The width of the blanking pulse which mutes the signal is
selectable as wide or narrow. W hen using SSB or CW
modes this can be set to give the best results, narrow
being preferable in most cases. AM and Sync modes use
longer blanking pulses anyway so there is little difference
between the wide and narrow settings. Again narrow is
preferred.
6-3 Noise blanker menu
The noise blanker is operated from one menu which is
inserted between the RF-IF menu and the VFO menu.
From the s-meter, press the 
[RF-IF] button and then the
right-hand menu button which is labelled 
[NB].
To get to the VFO menu, the right-hand menu button can
be pressed again. The RF-IF and VFO menu functions
are covered in the operating manual, section 6-9
onwards.
The noise blanker trigger level is controlled by the spin-
wheel in 16 steps between 0 and 99%.
The blanking pulse width is changed by pressing the ‘
button below the Wide
y
y
 bullet. The pulse is narrow when
the bullet is hollow and wide when solid.
The noise blanker can be turned on and off with the 
[NBy
y]
button, the bullet indicating its current state. Generally the
noise blanker can be left switched on with little ill effect
provided the trigger level is not too low. All noise blanker
settings are retained when the receiver is switched off.
7 Notch filter operation
7-1 Option configuration
The notch filter option has to be installed and configured
before the following features and menus are available.
Section 3-2
 details the CONFIG menu entry for installing
the notch filter option. There is a second CONFIG menu
entry to turn the notch auto tune facility on or off.
7-2 Notch filter operation
The audio notch filter in the NB7030 may be used to
remove annoying whistles (heterodynes) from a received
signal. It is operative in all reception modes and is
designed to provide very good rejection at the notch
frequrncy whilst making a minimal change to the quality
of the signal. It can be tuned across nearly the whole of
the receiver’s audio spectrum from 150Hz to 6kHz.
W hen manually tuned, the notch tuning rate is dependent
on the notch frequency. Because the notch gets wider at
higher frequencies it is tuned more quickly. To speed up
tuning and ensure that heterodynes are not missed the
tuning rate is automatically reduced when the notch
detects a steady signal near to the notch frequency. As
the tuning slows an ‘s’
 is displayed after the notch
frequency on the display.
The notch auto track facility uses the signal detection
system to automatically centre the notch on a steady
signal. Once the notch has detected a signal and manual
tuning has stopped the automatic track will take over and
an ‘a’
 is displayed after the notch frequency. Manual
tuning will override the auto system as soon as the spin-
wheel is turned. If the notched signal is removed the auto
system will disable, leaving the notch still tuned to the
same frequency - this allows the auto notch to
successfully remove morse code signals.
The auto track facility can be turned on or off by using the
CONFIG menu entry Notch auto tune:
 (see section 3-1
).
This setting is held in the setup memories (see operating
manual section 9-1
) and is set off by default. The notch
frequency is not saved when the receiver is switched off.
Completely automatic notch tuning is achieved with the
notch search facility. This is started manually by pressing
the 
[Srch] button whereupon the notch searches for any
steady signals starting at 300Hz up to the top limit of
6kHz. The filter will notch out the lowest frequency signal
it finds and then returns to manual tuning mode (so a
different notch frequency can be selected if needed). In
the event of mutiple heterodynes it is usually best to
remove the high frequency ones with the IF filter
bandwidth and passband shift facilities and then use the
notch to take out the low frequency signal. The notch will
only remove one signal, so choose the most annoying
one if there are several. 
						

							FPU7030  ADDITIONAL OPERATING INFORMATION           PAGE 8
7-3 Notch filter menu
The notch filter is operated from one menu which is
inserted between the FILTER menu and the TONE menu.
From the s-meter, press the 
[FILTER] button and then the
right-hand menu button which is labelled 
[Ntch].
To get to the TONE menu, the right-hand menu button
can be pressed again. The FILTER and TONE menu
functions are covered in the operating manual, section 6-
6
 onwards.
The notch filter frequency is controlled by the 
[Ntch] spin-
wheel and the frequency is displayed in kHz at the top
left. Annunciators after the frequency can show either ‘s’
,
indicating slow tuning, or ‘a’
, indicating auto tune is
active.
The notch filter can be turned on and off with the 
[Nchy
y]
button, the bullet indicating its current state. The filter is
switched on if the notch frequency control is rotated or if
the 
[Srch] button is pressed, so the [Nchy
y] button will
generally only be used to turn the filter off. The filter
defaults to off when the radio is switched on.
Auto search is started by pressing the ‘
 button below
Srch
. W hen the search is running the >>>>
 symbol
appears to the right of the notch frequency. W hen a
steady signal is found the search will stop and the notch
will auto tune onto the signal. The search symbol >>>>
will then disappear. If no signal is found the notch filter is
switched off and its frequency returned to 1kHz.
8 Option specifications
Performance figures relate to a typical production
NB7030 and are not guaranteed values. Specification
subject to change due to continuous development of the
receiver and its accessories. E&OE
© AOR Manufacturing Ltd  1997.
Notch Filter
Tuning range: 150Hz to 6.0 kHz digitally tuned.
Filter type: 4-pole switched capacitor notch.
Notch depth: > 40 dB, typically >50dB over most of
the tuning range.
Notch shape: At 1kHz >10Hz wide at -40dB
 80dB
Blanking period: Narrow 1.5ms  SSB and CW  modes.
8ms  AM and Aync modes.
W ide 6ms  SSB and CW  modes.
12ms  AM and Aync modes.
Bandwidth: 15kHz noise detection bandwidth.
Gating: SSB & CW Balanced IF gate after
narrowest 2
nd IF filter.
AM & Sync IF gate and slow slope
audio attenuator.