Dtmf Decoder; Rf Attenuator & Preamplifier; Config Menu Outline Of Facilities - AOR AR5000 Operating Manual

6-13 DTMF decoder

DTMF (Dual Tone Multi Frequency) tones are used by
many VHF/UHF communications services and amateur
radio operators to control switching devices and to enable
selective calling. The AR5000 has the capability to decode
all 16 DTMF tones.
All 16 characters can be displayed including " " to " ",
" ", "#" and "*". The decoded DTMF characters will
automatically be displayed when the facility has been
enabled and will be removed from the display after
approximately 60 seconds (providing a transmission is
encountered using DTMF!). (Note: Telephone services
do not normally use ABCD).
Frequency 1209
697
770
852
941 *
Note: The # symbol is displayed as "=" on the AR5000
LCD. If the DTMF tone consists of more than 10
characters, the LCD will scroll up the entire DTMF tone
set, overflowed characters will vanish and are not
retrievable unless an external display is used via the remote
RS232C port.
Selecting DTMF display
The operation of DTMF is global and affects VFO,
memory, scan & search operations and may be selected
ON or OFF.
1 DTMF ON/OFF is set & reviewed from the OPTION
menu. Press
the and
" ". The sequence will change if the
DESCRAMBLER (DS8000) or CTCSS (CT5000) options
have been installed.
(if DS8000 option is fitted)
(if CT5000 option is fitted)
2 Rotate the to toggle the setting between ON
and OFF, the key can also be used to select the
OFF position.
3 To complete the sequence and accept the input press
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1336 1447 1633
# (=)
to access the menu then use
keys until the display shows
6-14 RF Attenuator & preamplifier
The AR5000 features an RF stepped attenuator and
preamplifier. LCD legends "ATT
used to display the settings in use.
Below 230 MHz A switchable RF preamplifier is utilised
making the available selection of 0dB, -10dB & -20dB
with 0dB being the most sensitive selection with the
preamplifier on. The following provides a simple picture:
0dB Preamp ON
10dB Preamp OFF (10dB less sensitive)
20dB Preamp OFF
230 to 999.999999 MHz As the preamplifier is not used
above 230 MHz (a higher gain front end being used as
standard), the available settings are 0dB and 10dB. The
"AMP" legend is always displayed.
Above 1,000 MHz (1 GHz) The attenuator is disabled to
minimise signal loss through the switching unit... always
set to 0dB. The "AMP" legend is always displayed.
The receivers RF front end is automatically preselected
up to 999.999999 MHz so that performance is peaked
for maximum sensitivity and minimal interference.
However, should interference be encountered from very
strong local transmissions, increase the level of attenuation
to minimise the effects of unwanted signals. Some level
of experimentation will be required to find the best
combination depending upon particular circumstances.
The RF GAIN adjustment may also be useful in reducing
interference especially in USB, LSB and CW modes.
The selection of RF attenuator and preamplifier is made
from the ATTENUATOR menu. To activate the attenuator
menu press . The
and the sequence is completed using the
The attenuator value is stored into each memory channel
if this sequence has taken place in MEMORY RECALL
mode or SCAN mode (while scanning has stopped). The
attenuator status can also be stored into each search bank
and VFO.

6-15 CONFIG menu outline of facilities

The CONFIG menu is used to make many changes to
operations of the receiver, the less frequently accessed
items are held here to minimise the number of second
function keys thereby simplifying operation. Those facilities
required most frequently are placed first and second on
the list (lamp and beep).
The keys may be used to scroll through
the CONFIG menu and the
selection (along with the
circumstances).
dB" and "AMP" are
(most sensitive), "AMP"
legend displayed
10dB of attenuation added
and preamp off
(least sensitive)
is used to change value
is used to make
and key in some
key.