Icom IC-F620 Service Manual page 16

SOFTWARE ADJUSTMENT – continued
Select an operation using [↑] / [↓] keys, then set specified value using [←] / [→] keys on the connected computer keyboard.
ADJUSTMENT
RX 1 • Operating freq. : 400.000 MHz
SENSITIVITY
[BPF T1] –
[BPF T4] • IF bandwidth
• Connect a standard signal generator to
the antenna connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
CONVENIENT:
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.
• Operating freq. : 400.000 MHz
S-METER 1
[S-METER]
• IF bandwidth
• Connect an SSG to the antenna con-
nector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
• Set an SSG as :
2
Level
Modulation
Deviation
• Receiving
• Operating freq. : 415.000 MHz
SQUELCH 1
LEVEL
[SQL]
• IF bandwidth
• Connect an SSG to the antenna con-
nector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
*The output level of the standard signal generator (SSG) is indicated as the SSG's open circuit.
ADJUSTMENT CONDITION
440.000 MHz
480.000 MHz
: Wide
: 400.000 MHz
440.000 MHz
480.000 MHz
: 10 µV* (–87 dBm)
: 1 kHz
: ±3.5 kHz
±2.8 kHz
or
440.000 MHz
480.000 MHz
: Wide
: 400.000 MHz
440.000 MHz
480.000 MHz
: 14 µV* (–84 dBm)
: 1 kHz
: ±3.5 kHz
±2.8 kHz
: 0.45 µV* (–114 dBm)
: 1 kHz
: ±3.5 kHz
±2.8 kHz
465.000 MHz
500.000 MHz
: Narrow
: 415.000 MHz
465.000 MHz
500.000 MHz
: 0.2 µV* (–121 dBm)
: 1 kHz
: ±1.75 kHz
MEASUREMENT
UNIT LOCATION
[L] MAIN Connect a SINAD meter with a
4 Ω load to the external [SP]
[M]
[H] jack.
[L]
[M]
[H]
[N/W]
[N/M]
[L]
[M]
[H]
[L]
[M]
[H]
[N/W]
[N/M]
[N/W]
[N/M]
Connect a SINAD meter with a
[L] Rear
4 Ω load to the external [SP]
[M] panel
jack.
[H]
[L]
[M]
[H]
5 - 5
VALUE
Minimum distortion
level
Push [ENTER] key
on the connected
computer keyboard
to set "S3 level".
Push [ENTER] key
on the connected
computer keyboard
to set "S1 level".
Set "SQL level" to
close squelch.
Then set "SQL level"
at the point where
the audio signals
just appears.