Icom IC-F21 Service Manual page 17

SOFTWARE ADJUSTMENT – continued
Select an operation using [ ] / [ ] keys, then set specified value using [ ] / [ ] keys on the connected computer keyboard.
ADJUSTMENT
RX 1 • Operating frequency:
SENSITIVITY
[BPF T1]–[BPF T4] • Channel spacing
• Connect a standard signal generator to
the antenna connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
CONVENIENT:
SQUELCH • Operating frequency:
LEVEL
[SQL] • Channel spacing
1 • Connect a standard signal generator to
the antenna connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
2 • Receiving
*The output level of the standard signal generator (SSG) is indicated as the SSG's open circuit.
ADJUSTMENT CONDITION
440.000 MHz
:Narrow
: 440.000 MHz
: 10 µV* (–87 dBm)
: OFF
: ±1.75 kHz
The BPF T1–BPF T4 can be adjusted automatically.
q-1: Set the cursol to "BPF ALL" on the adjustment program and then push [ENTER]
key.
q-2: The connected PC tunes BPF T1–BPF T4 to peak levels.
w-1: Set the cursol to one of BPF T1, T2, T3, or T4 as desired.
w-2: Push [ENTER] key to start tuning.
w-3: Repeat w-1 and w-2 to perform additional BPF tuning.
455.000 MHz
: Narrow
: 455.000 MHz
: 0.2 µV* (–121 dBm)
: 1 kHz
: ±1.75 kHz
MEASUREMENT
UNIT LOCATION
Top Connect a SINAD meter with an
panel 8 load to the [SP] jack.
or
Top Connect a SINAD meter with an
panel 8 load to the [SP] jack.
5 - 6
VALUE
Minimum distortion
level
12 dB SINAD
At the point where
the audio signals
just appears.