Vertex Standard VX-2500U Service Manual page 14

Alignment
Setup the test equipment as shown below, apply 13.8V
DC power to the transceiver.
The transceiver must be programmed for use in the in-
tended system before alignment is attempted. The RF pa-
rameters are loaded from the file during the alignment
process.
Important
In order to facilitate alignment over the complete switch-
ing range of the equipment it is recommended that the
channel data in the transceiver is preset as the chart be-
low.
C
HANNEL
C
HANNEL
S
Ver. CS1
PACE
CH 1 Wide 435.100 MHz
CH 2 Narrow 435.100 MHz
CH 3 Wide 400.100 MHz
CH 4 Narrow 459.900 MHz
The alignment mode is accessed by "Alignment mode"
command from the computer whilst switching on. And it
is operated by the alignment tool automatically.
During the alignment mode, normal operation is suspend-
ed. Use the alignment tool program running on PC.
L1017
TP1007
14
Transceiver
( S )
F
REQUENCY IMPLEX
Ver. D Ver. DS1
470.100 MHz 485.100 MHz
470.100 MHz 485.100 MHz
450.100 MHz 450.100 MHz
489.900 MHz 519.900 MHz
RF Unit ( Lot. 1~5 ) Test & Alignment Points
PLL VCV
 Connect the positive lead of the DC voltmeter to
the test point TP1007 (VCV) on the RF-Unit, as
indicated in the figure, and the negative lead to
chassis ground.
 Set the transceiver to the high band edge fre-
quency channel, then adjust coil L1017 on the
Unit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1,
DS1) on the voltmeter.
 Key the transmitter, and adjust coil L1020 on the
Unit for 4.25V (for Ver. D) or 7.50V (for Ver. CS1,
DS1) on the voltmeter.
 Next select to the low edge frequency channel
and confirm above 0.80V to 1.50V on the voltme-
ter.
 Key the transmitter, and confirm above 1.00V to
1.60V on the voltmeter.
PLL Reference Frequency
With the wattmeter, dummy load and frequency counter
connected to the antenna jack, and select band center fre-
quency channel, key the transmitter and adjust TC1001
(Lot. 1~5) or VR1001 (Lot. 6~) on the RF-Unit, if neces-
sary, so the counter frequency is within 100 Hz of the chan-
nel center frequency for the transceiver version.
VX-2500 UHF Service Manual
L1020
TC1001