3
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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.
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OPERATION ON THE ADJUSTMENT MODE
• Change the adjustment item
: HM-75A’s [B] key
• Change the adjustment value
: HM-75A’s [UP]/[DN] keys
• Verify the adjustment value
: HM-75A’s [A] key
• Change the adjustment channel
: IC-4088A’s [UP]/[DN] keys
• Change the adjustment group
: IC-4088A’s [MODE]+ [UP]/[DN] keys
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ADJUSTMENT ITEMS
When entering adjustment mode, displayed adjustment items indicator on the LCD as follow.
• Reference frequecy adjustment
: Displayed
• Output power adjustment
: Displayed
• FM deviation adjustment
: Displayed
• CTCSS adjustment
: Displayed
• Squelch adjustment
: Displayed
EQUIPMENT
DC power supply
RF power meter
(terminated type)
Frequency counter
IC-4088A ADJUSTMENT PROCEDURES
1 PREPARATION
• When adjusting IC-4088A, HM-75A
OPTIONAL SPEAKER-MICROPHONE
is required.
•
All adjustment items must be preformed at “ADJUSTMENT MODE” as show below.
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REQUIRED TEST EQUIPMENT
GRADE AND RANGE
Output voltage
: 6 V DC
Current capacity
: 1 A or more
Measuring range
: 1 mW–1 W
Frequency range
: 300–600 MHz
Impedance
: 50
Ω
SWR
: Less than 1.2 : 1
Frequency range
: 0.1–600 MHz
Frequency accuracy : ±1 ppm or better
Sensitivity
: 100 mV or better
EQUIPMENT
FM deviation meter
Standard signal
generator (SSG)
GRADE AND RANGE
Frequency range
: 30–600 MHz
Measuring range
: 0 to ±10 kH
Frequency range
: 0.1–600 MHz
Output level
: 0.1 µV–32 mV
(–127 to –17 dBm)
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.
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
• DISPLAYED CHANNEL’S FREQUENCY LIST
