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

5-3 TRIMMER ADJUSTMENT for IC-F3/S

Select an operation using [ ]/[ ] keys, then set the specified value using [ ]/[ ] keys on the connected computer keyboard.
ADJUSTMENT
REFERENCE 1 • Operating freq. :
FREQUENCY 136.000 MHz (L-band)
146.000 MHz (H-band)
• High/Low switch : Low
• Transmitting
2 •Transmitting
OUTPUT 1 • Operating freq. :
143.000 MHz (L-band)
POWER
146.000 MHz (H-band)
• High/Low switch : Low
• Transmitting
2 • High/Low switch : High
• Transmitting
1 • Operating freq. :
FM DEVIATION
143.000 MHz (L-band)
160.000 MHz (H-band)
• High/Low switch : Low
• Connect an audio generator to the [MIC]
jack and set as:
1 kHz/150 mV
• Set an FM deviation meter as:
HPF
LPF
De-emphasis : OFF
Detector
• Transmitting
1 • Operating freq. :
BPF1–BPF4
136.000 MHz (L-band)
146.000 MHz (H-band)
• Set an SSG as:
Level
Modulation
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.
ADJUSTMENT CONDITION
: OFF
: 20 kHz
: (P–P)/2
: 3.2 µV* (–97 dBm)
: 1 kHz
: ±3.5 kHz (W-type)
±1.75 kHz (N-type)
±2.8 kHz (M-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
UNIT LOCATION
Top Loosely couple a frequency
panel counter to the antenna connec-
tor.
Top Connect an RF power meter to
panel the antenna connector.
Top Connect an FM deviation meter
panel to the antenna
through an attenuator.
Top Connect an SSG to the antenna
panel connector and a SINAD meter
with an 8 Ω load to the [SP] jack.
or
5 - 4
VALUE
136.000000 MHz
(L-band)
146.000000 MHz
(H-band)
136.001360 MHz
(L-band)
146.001460 MHz
(H-band)
1.0 W
5.0 W
±4.2 kHz (W-type)
connector ±2.1 kHz (N-type)
±3.4 kHz (M-type)
Minimum distortion
level