Icom IC-446S, Service Manual

Page: 10 / 27

5 - 2
SECTION 5 ADJUSTMENT PROCEDURES
5-1 PREPARATION
■
REQUIRED TEST EQUIPMENT
EQUIPMENT
DC power supply
Frequency counter
FM deviation meter
DC voltmeter
RF power meter
(terminated type)
GRADE AND RANGE
Output voltage : 4.5 V DC
Current capacity : 1 A or more
Frequency range : 0.1–600 MHz
Frequency accuracy : ±1 ppm or better
Sensitivity
: 100 mV or better
Frequency range : 30–600 MHz
Measuring range : 0 to ±10 kHz
Input impedance : 50 k
Ω
/V DC or better
Measuring range : 100 mW–1 W
Frequency range : 300–600 MHz
Impedance : 50
Ω
SWR : Less than 1.2 : 1
EQUIPMENT
Audio generator
Standard signal
generator (SSG)
Oscilloscope
AC millivoltmeter
External speaker
Attenuator
GRADE AND RANGE
Frequency range : 300–3000 Hz
Measuring range : 1–500 mV
Frequency range : 0.1–600 MHz
Output level : 0.1 µV–32 mV
(–127 to –17 dBm)
Frequency range : DC–20 MHz
Measuring range : 0.01–10 V
Measuring range : 10 mV–10 V
Input impedance : 8
Ω
Capacity : 300 mW or more
Power attenuation : 30 or 40 dB
Capacity : 1 W or more
■
ENTERING THE ADJUSTMENT MODE
q
Turn the transceiver power OFF.
w
While connecting the “TEST” and GND on the MAIN unit, then turn power ON.
(See location at page 5-3)
■
CONNECTIONS
to the RF test port J1
Standard signal
generator
–17 to –127 dBm
(32 mV to 0.1
µ
V)
CAUTION:
DO NOT transmit while SSG is
connected to the antenna connector.
Frequency
counter
FM deviation
meter
Attenuator
30 dB or 40 dB
RF power meter
50
Ω
/100 mW–1 W
DC power supply
4.5 V/1.0 A
–
+