Vertex Standard VXR-9000 Series, Service Manual

Page: 21 / 118

VXR-9000 UHF Service Manual
Alignment
G-5
Sub-Audio ( DCS ) Deviation

Setup the test equipment as shown below.

Open the “Alignment” window, then click the left
mouse button on the “Deviation” tab to move to the
“Deviation” screen.

Click the left mouse button on the “DCS W” box on
the “Low Band Edge Frequency” area of the “MAX
Deviation (CTCSS/DCS)” field (highlighted in “pink”).

Click the left mouse button on the “PTT On” button to
actitvate the transmitter (the “PTT On” label is changed
to “PTT Off”).

Press the [ Page Up
]/[
Page Down
] key so that the De-
viation Meter reading is 0.75 kHz ±0.1 kHz.







Click the left mouse button on the “PTT Off” button
to disable the transmitter (the “PTT Off” label is re-
turned to “PTT On”).

Repeat the above steps at the “DCS N” box on the “Low
Band Edge Frequency” area of the “MAX Deviation
(CTCSS/DCS)” field (highlighted in “pink”) so that the
Deviation Meter reading is 0.38 kHz ±0.08 kHz.

Repeat the above steps at the eight points (box: fre-
quencies).
Modulation Balance

Setup the test equipment as shown below.
NG NG OK







Set the AF Signal Generator output to 500 mVp-p, 100
Hz square signal.

Open the “Alignment” window, then click the left
mouse button on the “Deviation” tab to move to the
“Deviation” screen.

Click the left mouse button on the “Mod” box on the
“Low Band Edge Frequency” area of the “Modulation
Balance” field (highlighted in “pink”).

Click the left mouse button on the “PTT On” button to
actitvate the transmitter (the “PTT On” label is changed
to “PTT Off”).

Press the [
Page Up
]/[
Page Down
] key so that the Os-
cilloscope shown 100 Hz square wave is obtained. See
illustrations at the right.

Click the left mouse button on the “PTT Off” button
to disable the transmitter (the “PTT Off” label is re-
turned to “PTT On”).

Repeat the above steps at the four points (box: frequen-
cies).
50-ohm
Dummy Load
Computer
(CE60)
Deviation
Meter
VXR-9000
FRB-6
MIC
TX ANT
Sampling
Coupler
FIF-10A
or
FIF-12
50-ohm
Dummy Load
AF Signal
Generator
Computer
(CE60)
Deviation
Meter
VXR-9000 FRB-6
MIC
DSUB 25-pin
ACC Connector
Pin 25 (TXD HIGH)
TX ANT
Sampling
Coupler
FIF-10A
or
FIF-12