Vertex Standard VX-210AU, Service Manual

Page: 12 / 42

12
Alignment
PLL Reference Frequency
r
Set the transceiver to CH 2 (band center). Key the trans-
mitter, and adjust
TC1001
on the component side of
the Main Unit, if necessary, so the frequency counter
displays the band center frequency (±100 Hz) (for the
version being aligned) when transmitting.
Transmitter Output Power
r
Set the transceiver to CH 2 (band center), and select
high power output.
r
Ensure that the supply voltage is precisely 7.2 V, then
adjust
VR1004
on the component side of the Main Unit
(while the PTT switch is pressed) for 5.0 W on the watt-
meter, and confirm that supply current remains below
2.0 A.
Modulation Level
r
Set the transceiver to CH 2 (band center), and adjust
the AF generator for -10 dBm output at 1 kHz to the
EXT MIC jack.
r
Press the PTT switch , and adjust
VR1002
on the com-
ponent side of the Main Unit for a deviation of ±4.2
kHz (for 25 kHz steps), or ±2.1 kHz (for 12.5 kHz steps).
DCS Modulation Level
r
Set the transceiver to CH 2 (band center), and activate
the DCS with a code number of 627.
r
Press the PTT switch, and adjust
VR1003
on the com-
ponent side of the Main Unit for a deviation of ±0.75
kHz (for 25 kHz steps), or ±0.45 kHz (for 12.5 kHz
steps).
Receiver
Sensitivity
r
Set the transceiver to CH 3 (high band edge), and
tune the RF signal generator to the same frequen-
cy; set the generator for ±3.0 kHz deviation with 1
kHz tone modulation, and set the output level for
40 dBµ at the antenna jack.
r
Adjust
VR1001
on the component side of the Main Unit
for optimum SINAD, and confirm that signal genera-
tor level is better than -6 dBµ for 12 dB SINAD.
RSSI
r
Connect the DC voltmeter between
TP43
on the com-
ponent side of the Main Unit and ground.
r
Set the transceiver to CH 2 (band center), and tune the
RF signal generator to the same frequency; set the gen-
erator for ±3.0 kHz deviation with 1 kHz tone modula-
tion, and set the output level for 15 dBµ at the antenna
jack.
r
Adjust
VR1005
on the component side of the Main Unit
for 0.7 V (±0.1 V) on the voltmeter.
VR1004
VR1002
VR1001
TP43
VR1005
TC1001
VR1003