Yaesu FT-2400H Technical Supplement page 20

Receiver
Set up the test equipment as shown below for
receiver alignment.
Receiver Alignment Setu p
RF Signal
Generator
Interstage Trans
D Connect the DC voltmeter between J1003 pin 7
and chassis ground.
D Modulate the RF signal generator with ± 3.5
kHz deviation of a 1-kHz tone.
D Adjust T1001 through T1004 on the Main Unit
for maximum voltage on the meter, then adjust
T1006 for optimum SINAD (at least -7 dBµ for
12 dB SIN AD).
S-Meter Calibration
D While tuned to 146.000 MHz, inject 25 dBµ RF
modulated with ± 3.5 kHz deviation of a 1-kHz
tone, and adjust VR3005 on the Interface Unit so
that all S-meter segments are just on.
4-4
ALIGNMENT
Regulated
13.6V PSU
Speaker or 8-ohm
lead resistor
f
ormers
Oscilloscope
AF Millivoltmeter
SINAO Meter
Distortion
Meter
Scanner Center-Stop
D Connect the DC voltmeter (3-V range) between
TP3001 (+) and TP3002 (-) on the Interface Unit.
D With both the transceiver and signal generator
tuned to 146.000 MHz, set the SQL fully counter­
clockwise (the BUSY indicator should be on).
Inject 20 dBµ RF modulated with ± 3.5 kHz de­
viation of a 1-kHz tone, and adjust VR3004 on
the Interface Unit for zero volts on the voltmeter.
Squelch
D At the center of the band, tune the
generator to the same frequency, and set the
generator level to -12 dBµ.
D Turn VR1001 clockwise until the squelch just
closes, and then counterclockwise very slightly
so that it just opens.
Receiver Alignment Points
4
-
)
VR3oos
T
oo 4
1
T
1003
T,
1 002
001
T , 005
VR1001
3 Pin 7
o
10
RF
signal