Pll Vcv; Pll Reference Frequency; Rf Unit Test & Alignment Points - Vertex Standard VX-2500EV Service Manual

Alignment
Important
In order to facilitate alignment over the complete switch-
ing range of the equipment it is recommended that the chan-
nel data in the transceiver is preset as the chart below.
C F
HANNEL REQUENCY
C
HANNEL
S (S
PACE IMPLEX
CH 1 Wide 154.100 MHz
CH 2 Narrow 154.100 MHz
CH 3 Wide 154.100 MHz
CH 4 Narrow 154.100 MHz
CH 5 Wide 154.100 MHz
CH 6 Narrow 154.100 MHz
CH 7 Wide 134.100 MHz
CH 8 Wide 173.900 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.

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 6.90V on the voltmeter.
Key the transmitter, and adjust coil L1020 on the
Unit for 7.20V on the voltmeter.
12
T F RF
ONE REQUENCY
) , DCS P
OR CODE OWER
- High
- Low
123.0 Hz ( CTCSS )
Low
123.0 Hz ( CTCSS )
Low
023 ( DCS )
Low
023 ( DCS )
Low
- Low
- Low
Next select to the low edge frequency channel
and confirm above 1.00V to 1.80V on the volt-
meter.
Key the transmitter, and confirm above 1.10V to
2.00V 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 VR1001
on the RF-Unit, if necessary, so the counter frequency is
within 100 Hz of the channel center frequency for the trans-
ceiver version.
L1017
TP1007
L1020
VR1001
RF Unit Test & Alignment Points