Icom IC-F3, Service Manual

Page: 20 / 52

5 - 8
F4/S
Select an item using [
↑
]/[
↓
] keys on the connected computer keyboard.
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5-7 TRIMMER ADJUSTMENT for IC-F4/S
REFERENCE
FREQUENCY
OUTPUT
POWER
BPF1–BPF4
1
2
1
2
3
4
1
• Operating freq. :
400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• High/Low switch : Low
• Transmitting
• Transmitting
• Operating freq. :
415.000 MHz (L-band)
455.000 MHz (ML-band)
485.000 MHz (MH-band)
501.000 MHz (H1-band)
505.000 MHz (H2-band)
• High/Low switch : High
• Transmitting
• Operating freq. :
400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• High/Low switch : High
• Transmitting
• High/Low switch : Low
• Transmitting
• Operating freq. :
400.000 MHz (L-band)
440.000 MHz (ML-band)
470.000 MHz (MH-band)
490.000 MHz (H1/H2-bands)
• Set an SSG as:
Level : 3.2 µV* (–97 dBm)
Modulation : 1 kHz
Deviation : ±3.5 kHz (W-type)
±1.75 kHz (N-type)
• Receiving
Top
panel
Top
panel
Top
panel
Loosely couple a
frequency counter
to the antenna con-
nector.
Connected comput-
er screen “Power
(Hi)”.
Connect an RF
power meter to the
antenna connector.
Connect an SSG to
the antenna con-
nector and a SINAD
meter with an 8
Ω
load to the [SP]
jack.
400.000000 MHz
(L-band)
440.000000 MHz
(ML-band)
470.000000 MHz
(MH-band)
490.000000 MHz
(H1/H2-bands)
400.004000 MHz
(L-band)
440.004400 MHz
(ML-band)
470.004700 MHz
(MH-band)
490.004900 MHz
(H1/H2-bands)
180
Maximum output
4.2 W
1.1 W
Minimum distortion
level
Push [
←
] or [
→
]
keys on the com-
puter key-board.
Push [
←
] or [
→
]
keys on the com-
puter key-board.
Adjust C467 on
the MAIN unit.
(see detailed
illustration at
right)
Push [
←
] or [
→
]
keys on the com-
puter key-board.
Push [
←
] or [
→
]
keys on the com-
puter key-board.
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE ADJUSTMENT
UNIT LOCATION
CONVENIENT: The BPF T1–BPF T4 can be adjusted automatically.
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.
or
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.