Icom IC-F410 Service Manual page 16

TRIMMER ADJUSTMENT — continued
Select an operation using [↑] / [↓]keys, then set specified value using [←] / [→] keys on the connected computer keyboard.
ADJUSTMENT
DTCS WAVE 1 • Operating frequency: (CH1)
[L-band]
FORM
[ML-band]
[ML-band]
[MH-band]
[H-band]
• Power selection
• No audio signal is applied to the [MIC]
jack
• DTCS code
• Set an FM deviation meter as:
HPF
LPF
De-emphasis
Detector
• Transmitting
RECEIVE • Operating frequency: (CH1)
[BPF T1]– [L-band]
[ML-band]
[BPF T4]
[ML-band]
[MH-band]
[H-band]
• Connect a standard signal generator to
the antenna connector and set as:
Level
Modulation: 1 kHz
Deviation : ±3.5 kHz (Wide)
• Receiving
CONVENIENT: The BPF T1–BPF T4 can be adjusted automatically.
1 • Operating frequency: (CH1)
SQUELCH
[L-band]
LEVEL
[ML-band]
[SQL]
[ML-band]
[MH-band]
[H-band]
• Connect an SSG to the antenna con-
nector and set as
Level
Modulation: OFF
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
ADJUSTMENT CONDITION
: 400.00000 MHz
∏ : 440.00000 MHz
Ò : 450.00000 MHz
: 470.00000 MHz
: 490.00000 MHz
: Low1
: 007
: OFF
: 20 kHz
: OFF
: (P–P)/2
: 400.00000 MHz
: 440.00000 MHz
∏
Ò : 450.00000 MHz
: 470.00000 MHz
: 490.00000 MHz
: 3.2 µV* (–97 dBm)
±1.75 kHz (Narrow)
q-1 Set each to 0, then push the [F9] key.
(The cursor must be set to the BPF T1 position.)
q-2 The connected PC tunes BPF T1–BPF T4 to peak levels.
w-1 Set the cursor to one of BPF T1, T2, T3 or T4 as desired.
w-2 Push [F8] to start tuning.
w-3 Pepeat w-1 and w-2 to perform additional BPF tuning.
: 400.00000 MHz
∏ : 440.00000 MHz
Ò : 450.00000 MHz
: 470.00000 MHz
: 490.00000 MHz
:
: adjust SSG's level to 8
dB SINAD on the con-
necting SINAD meter
MEASUREMENT
UNIT LOCATION
Rear Connect an FM deviation meter
panel with an oscilloscope to the
antenna connector through an
attenuator.
Rear Connect a SINAD meter with a 4
Ω load to the external [SP] jack.
panel
or
Rear Connect a SINAD meter with a 4
Ω load to the external [SP] jack.
panel
5 - 5
VALUE
Set to flat wave
form
Minimum distortion
level
At the point where
noise just appears.