Sub-Audio (Dcs) Deviation; Modulation Balance - Vertex Standard VXR-9000 Service Manual

Sub-Audio (DCS) Deviation

Setup the test equipment as shown below.
50-ohm
Dummy Load
Deviation
Meter
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").

Modulation Balance

Setup the test equipment as shown below.
Sampling
Coupler
50-ohm
Dummy Load
TX ANT
Oscilloscope
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).
Sampling
Coupler
VXR-9000
TX ANT
MIC
Computer
( CE60 )
Computer
VXR-9000
( CE60 )
MIC
DSUB 25-pin Accessory Connector
Pin 25 ( TXD HIGH )
AF Signal
Generator
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).
NG NG
Alignment
OK
G-5