ILER-DDS V2.1 VFO/DDS.
Page 15
PART TWO:
PROGRAMMING AND USING
THE VFO/DDS
FACTORY CONFIGURATION
The ILER-DDS is configurated to work with the
ILER-40
, with the following parameters:
LOWER LIMIT
:
07.000
(Band lower limit: 7.000 MHz).
UPPER LIMIT:
07.300
(Band upper limit: 7.300 MHz).
YOUR CALL ?:
CALL ON:
EA3GCY
IF FREQ:
IF = 04913500 Mode: VFO = RF + FI ( for ILE-40)
IF is 4.913500 MHz and the output mode from the VFO/DDS is 7.000000 MHz + 4.913500 MHz
Please notice that the IF real offset is lower than the nominal frequency of the IF filter crystals (4.915.8 MHz).
CAL FREQ:
+150 Hz
(you will have to adjust it to compensate for tolerances)
CAL VOLT:
Calibrated.
The measuring error may be up to +/-10 %
You will have to adjust it, as each kit may be different due to the resistors used at the divider placed at the input of
the ADC conversor (R2 and R3)
S-METER CAL:
Calibrated.
(for ILER-40)
S-METER MODE:
Reversed.
VFO A/B:
VFO-A
RIT ON/OFF:
OFF
CHANGE STEPS
:
1 kHz - 100 Hz.
S-METER or VOLTS:
Volts
SET INI FREQS:
Current ones
(fixed frequencies are stored in VFO-A and in VFO-B)
LCD BACKLIGHT:
ON
(always lit)
LOCK
:
Unlock
USING THE ILER-DDS
It is very simple. Once programmed, its use is highly intuitive.
Dial tuning and step change:
By turning right or left the rotary encoder the frequency respectively
increases or decreases by the current "step".
This is marked by an underline on the digit. For instance, the example shows the underline digit as the
kHz units. Every step will move the frequency one kHz up or down. If the underline will be placed on the
100 Hz digit, the steps will be of 100 Hz each.
A quick push on the encoder will change the position of the underline among the preselected "CHANGE
STEPS”.
The letter A in the second line means that it is in the VFO-A
7
1
5
0
.
0
0
A
1
2
.
5
V
