Icom IC-4088E, Руководство по обслуживанию

Страница: 11 / 29

TEST
J1
to RF unit J1
DC power supply
4.5 V /1.0 A
Frequency
counter
FM deviation
meter
CAUTION:
DO NOT
transmit while the SSG is
connected to the antenna.
RF power meter
50
Ω
/ 1–500 mW
to SP JACK
HM-75A
to MIC JACK
Audio generator
AC millivoltmeter
to DC IN
Standard signal
generator
CONNECTION
ENTERING THE ADJUSTMENT MODE
¡ ¡
Turn the transceiver’s power OFF.
™ ™ While connecting the “TEST” on the MAIN board to “GND”,
then turn power ON.
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-4088E’s [UP]/[DN] keys
• Change the adjustment group : IC-4088E’s [MODE]+ [UP]/[DN] keys
ADJUSTMENT ITEMS
When entering adjustment mode, displayed adjustment items indicator on LCD as follow.
• Reference frequecy adjustment : Displayed
• Output power adjustment : Displayed
• FM deviation adjustment : Displayed
• CTCSS adjustment : Displayed
• Squelch adjustment : Displayed
5 - 1
EQUIPMENT
DC power supply
RF power meter
(terminated type)
Frequency counter
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION
When adjusting IC-4088E, HM-75A
OPTIONAL SPEAKER-MICROPHONE
is required.
All adjustment items must be preformed at “ADJUSTMENT MODE” as show below.
REQUIRED TEST EQUIPMENT
GRADE AND RANGE
Output voltage : 4.5 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)
A
OFF ON
LOCK
B
Lock switch:
Locks all
switches
except [PTT]
Earphone
jack
PTT switch