Icom IC-4088A Adjustment Procedure

IC-4088A ADJUSTMENT PROCEDURES
1 PREPARATION
• When adjusting IC-4088A, HM-75A
•
All adjustment items must be preformed at "ADJUSTMENT MODE" as show below.
' ' REQUIRED TEST EQUIPMENT
EQUIPMENT
Output voltage
DC power supply
Current capacity
Measuring range
RF power meter Frequency range
(terminated type) Impedance
SWR
Frequency range
Frequency counter Frequency accuracy : ±1 ppm or better
Sensitivity
ENTERING THE ADJUSTMENT MODE
' '
¡ ¡ Turn the transceiver's power OFF.
™ ™ While connecting the "TEST" on the MAIN board to "GND", and then turn power ON.
OPERATION ON THE ADJUSTMENT MODE
' '
• Change the adjustment item
• Change the adjustment value
• Verify the adjustment value
• Change the adjustment channel
• Change the adjustment group
ADJUSTMENT ITEMS
' '
When entering adjustment mode, displayed adjustment items indicator on the LCD as follow.
• Reference frequecy adjustment
• Output power adjustment
• FM deviation adjustment
• CTCSS adjustment
• Squelch adjustment
• DISPLAYED CHANNEL'S FREQUENCY LIST
CHANNEL NO.
1 ch.
2 ch.
3 ch.
4 ch.
5 ch.
6 ch.
7 ch.
8 ch.
9 ch.
10 ch.
11 ch.
12 ch.
13 ch.
14 ch.
OPTIONAL SPEAKER-MICROPHONE
GRADE AND RANGE
: 6 V DC
: 1 A or more
: 1 mW–1 W
: 300–600 MHz
: 50 Ω
: Less than 1.2 : 1
: 0.1–600 MHz
: 100 mV or better
: HM-75A's [B] key
: HM-75A's [UP]/[DN] keys
: HM-75A's [A] key
: IC-4088A's [UP]/[DN] keys
: IC-4088A's [MODE]+ [UP]/[DN] keys
: Displayed
: Displayed
: Displayed
: Displayed
: Displayed
FREQUENCY
462.5625 MHz
462.5875 MHz
462.6125 MHz
462.6375 MHz
462.6625 MHz
462.6875 MHz
462.7125 MHz
467.5625 MHz
467.5875 MHz
467.6125 MHz
467.6375 MHz
467.6625 MHz
467.6875 MHz
467.7125 MHz
is required.
EQUIPMENT
FM deviation meter Frequency range
Measuring range
Standard signal
Frequency range
generator (SSG)
Output level
3
GRADE AND RANGE
: 30–600 MHz
: 0 to ±10 kH
: 0.1–600 MHz
: 0.1 µV–32 mV
(–127 to –17 dBm)