PAGE 20 AR5000 OPERATING MANUAL
Note: The MAIN DIAL is a mechanical encoder and as
such small variations in tuning may be experienced or the
frequency may move slightly after rotation, this is normal.
To ensure the best life span and smoothest operation,
rotate the control from time to time to ensure the encoder’s
track remains clean.
SUB DIAL
The SUB DIAL can also be used to select the receive
frequency in three different ways:
l Same step size as the MAIN DIAL
l 10 times faster than the MAIN DIAL
l One of the step sizes from 0.1 kHz (100 Hz),
0.5 kHz (500 Hz), 1.0 kHz, 5.0 kHz, 10.0 kHz,
50.0 kHz, 100.0 kHz, 500.0 kHz or 1000.0
kHz (1 MHz).
The
key enables the step size for the SUB DIAL to
be selected.
Press the
key, the flashing legend “STEP” on the
LCD confirms that the STEP SELECT MENU has been
activated. The first menu is for the MAIN DIAL so press
or
to move on to the SUB DIAL configuration
(if step adjust is in use the legend “*” will be displayed and
the
keys will require two presses to
increment to the SUB DIAL menu). The flashing legends on
the LCD “STEP” and “SUB” indicate that the SUB DIAL
step selection menu has been activated. Use the
SUB DIAL to make selection:
SUB MAIN
SUB x 10
SUB 0.1 kHz
MAIN = tuning rate for the SUB DIAL will be the same as
that of the MAIN DIAL.
x10 = tuning rate of the SUB DIAL will be ten times faster
than the MAIN DIAL (i.e. a tuning rate on the MAIN DIAL of
25 kHz will be 250 kHz on the SUB DIAL).
0.1 kHz (100 Hz), 0.5 kHz (500 Hz), 1.0 kHz, 5.0 kHz,
10.0 kHz, 50.0 kHz, 100.0 kHz, 500.0 kHz, 1000.0 kHz
(1 MHz) = tuning rates for SUB DIAL.
When the selection has been made, press
to
accept the changes and return to VFO mode. If you wish
to abort step size selection press
6-7 Step-adjust
The AR5000 provides a powerful feature to enable
accurate following of unusual bandplans. When active,
the “STEP-ADJ” legend is displayed in the centre of the
LCD.
Step-adjust is used when the receiving frequency is not
divisible by the step size in use (It is possible that step-
adjust has been programmed into the automode bandplan
data for some world market areas). Therefore step-adjust
is useful for certain bandplans such as cellular which in
some areas starts as 917.0125 MHz then increments in
25 kHz steps. Another example is the CB allocation in
certain areas which starts at 27.60125 MHz then
increments in 10 kHz steps.
Example:
Tune through the UK CB frequencies of 27.60125 MHz in
10 kHz steps with mode set to FM, 15 kHz bandwidth.
Select frequency: Select the start frequency for tuning,
in this example 27.60125 MHz
Set up step: Press the
key to access the tuning
step menu. Select a step size of 10 kHz by pressing
. Select STEP-ADJUST by pressing
,
the “*” legend is displayed on the left of the LCD to confirm
operation. Complete the sequence by pressing
.
You may review or change the
offset
value used by
step-adjust via the STEP menu. Press
to access
the tuning step menu. Initially the
step
size is displayed,
press
to view the
STEP-ADJUST
value.
Note: It is possible to enter a new value of step-adjust
using the
SUB DIAL
and numeric keypad (i.e.
)
while viewing the step-adjust value, you can experiment
with interesting results! If you intend direct programming
please refer to the mathematical explanation at the end
of this section 6-7.
Half step:
If the original tuned frequency were a
round number such as 145.000 MHz with a step size
of say 25 kHz, the default step-adjust would be half of
the original step size (12.5 kHz).
Press to accept the data input and return to VFO
mode. Alternatively press
to abort entry and return
to VFO mode.
Select receive mode: Press the
key and use
the SUB DIAL to select “FM”. Press
to accept the
selection and return to VFO mode.
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