Trimmer Adjustment For Ic-F4/S - Icom IC-F3 Service Manual

5-7 TRIMMER ADJUSTMENT for IC-F4/S

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