Yaesu VX-8DR/E, Service Manual

Page: 18 / 118

18 VX-8R/E and VX-8DR/E Technical Supplement
TX Deviation Adjustment (MAX DEV)
Ì
Connect the test equipment as shown in Figure 1: TX
Alignment Setup.
Ì
Rotate the DIAL knob to select the Alignment Menu
" MAX DEV ".
Ì
Set the AF Signal Generator output to 50 mVrms with
a 1 kHz audio tone.
Ì
Press the [
V/M
] button (the " " icon will appear on the
display).
Ì
Press the PTT switch to transmit and rotate the DIAL
knob so that the Deviation Meter setting is 4.2 kHz ±
0.2 kHz (USA version) or 4.5 kHz ± 0.2 kHz (EXP/EU
versions).
Ì
Release the PTT switch, and then press the [
V/M
] but-
ton (the " " icon will disappear on the display).
CTCSS TX Deviation Adjustment (100.0Hz)
Ì
Connect the test equipment as shown in Figure 1: TX
Alignment Setup.
Ì
Rotate the DIAL knob to select the Alignment Menu
" 100.0Hz ".
Ì
Press the [
V/M
] button (the " " icon will appear on the
display).
Ì
Press the PTT switch to transmit without the micro-
phone input and rotate the
DIAL knob so that the De-
viation Meter setting is 0.65 kHz (±0.05 kHz).
Ì
Release the PTT switch, and then press the [
V/M
] but-
ton (the " " icon will disappear on the display).
DCS TX Deviation Adjustment (DCS 023)
Ì
Connect the test equipment as shown in Figure 1: TX
Alignment Setup.
Ì
Rotate the
DIAL
knob to select the Alignment Menu
" DCS 023 ".
Ì
Press the [
V/M
] button (the " " icon will appear on
the display).
Ì
Press the PTT switch to transmit without the micro-
phone input and rotate the
DIAL knob so that the De-
viation Meter setting is 0.65 kHz (±0.05 kHz).
Ì
Release the PTT switch, and then press the [
V/M
] but-
ton (the " " icon will disappear on the display).
B-Band 430 MHz Band Adjustment
Press and hold in the [ B ] key for two seconds to change
the operating band to the " B-Band ".
Note : When the transceiver recalls Alignment Menu "PLL
REF", the [ B ] key operation is ignored. In this case, rotate
the DIAL knob to select an Alignment Menu other than
"PLL REF".
Receiver Sensitivity Adjustment (TUNE DC)
Ì
Connect the test equipment as shown in Figure 2: RX
Alignment Setup.
Ì
Rotate the DIAL knob to select the Alignment Menu
" TUNE DC ".
Ì
Set the RF Signal Generator output to 435.100 MHz, at
a level of -10 dBµ, ±3.5 kHz deviation with a 1 kHz
audio tone.
Ì
Press the [
V/M
] button (the " " icon will appear on
the display).
Ì
Rotate the
DIAL
knob for maximum deflection on the
SINAD meter.
Ì
Press the [
V/M
] button (the " " icon will disappear on
the display).
Squelch Hysteresis Confirmation (HIS SQL)
Ì
Rotate the
DIAL
knob to select the Alignment Menu
" HIS SQL ".
Ì
Confirm that the alignment value is "0".
Squelch Threshold Adjustment (THLD SQL)
Ì
Connect the test equipment as shown in Figure 2: RX
Alignment Setup.
Ì
Rotate the DIAL knob to select the Alignment Menu
"THLD SQL".
Ì
Set the RF Signal Generator output to 435.100 MHz, at
a level of -11 dBµ, ±3.5 kHz deviation with a 1 kHz
audio tone.
Ì
Press the [
V/M
] button (the " " icon will appear on
the display).
Ì
Press the [
F/W
] key two times to store the Squelch
Threshold level.
Ì
Press the [
V/M
] button (the " " icon will disappear on
the display).
Alignment