Vertex Standard VXR-1000, Service Manual

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29
Alignment
The VXR-1000 has been aligned at the factory
for the specified performance across the frequen-
cy range specified for each version.
Realignment should therefore not be necessary
except in the event of a component failure, or af-
ter alteration of the repeater version. All compo-
nent replacement and service should be per-
formed only by an authorized Vertex Standard
representative, or the warranty policy may be
voided.
The following test equipment is required for
alignment:
IBM PC/compatible computer w/Vertex Stan-
dard VPL-1 cable, FRB-4, and CE-22 channel
programming diskette.
RF signal generator: calibrated output level
at 1000 MHz (0 dBµ = 1.0 µV - closed circuit)
Deviation meter (linear detector)
Oscilloscope
AF millivoltmeter
SINAD meter
Inline wattmeter: 1000 MHz, 10 W scale
Regulated DC power supply: adjustable from
10 to 17 V, 3 A
50-Ohm non-reactive dummy load: 10 W at
1000 MHz
Frequency counter: 0.2 ppm accuracy at 1000
MHz
AF signal generator
DC Voltmeter: high impedance
RF Sampling Coupler (attenuation pad)
Before beginning, connect the transceiver and
PC using the VPL-1 cable and FRB-4 as shown
below, and download the EEPROM data from
the transceiver to the computer.
Store this data in a disk file so that it can be saved
and retrieved later. Using the table below, pro-
gram the channel, CTCSS, and DCS alignment
settings for your transceiver version. Upload this
file to the transceiver.
PLL & Transmitter
Set up the test equipment as shown for Trans-
mitter & PLL alignment. Adjust the supply volt-
age to 13.8 V for all steps. Refer to the Tx & PLL
Unit Alignment Points photo for alignment lo-
cations.
PLL Reference Frequency
Tune the transceiver to channel #3, connect an
attenuator pad and frequency counter between
the ANT connector and dummy load, key the
transmitter, and adjust TC2001 on the MAIN
Unit for precisely 460.00 MHz (±100 Hz).
PLL VCV
Connect the RF sampling coupler in-line be-
tween the antenna jack and the RF dummy
load. Connect the frequency counter to the
coupler.
Connect the DC voltmeter between VCV test
point TP2006 on the PCB (Printed Circuit
Board) and chassis ground.
Set the transceiver to the low band edge chan-
nel, #1. Key the transmitter and adjust T2001
on the PCB for 0.5 V on the voltmeter.
Select the high band edge channel, #2. and con-
firm the high-end VCV is at 3.5 V ±0.3 V.
RF Sampling
Coupler
RF Signal
Generator
50-
Ω
Dummy Load
Inline Wattmeter
Deviation Meter
Frequency
Counter
Power Supply
13.8V DC
VPL-1 Connection
Cable
COM port
FRB-4
VXR-1000
Alignment Channel Frequencies (MHz)
Channel
Freq. (MHz)
CTCSS
DCS
POWER
CH 1
450.00
OFF
OFF
5.0 W
CH 2
470.00
OFF
OFF
5.0 W
CH 3
460.00
OFF
OFF
5.0 W
CH 4
470.00
151.4 Hz
OFF
5.0 W
CH 5
470.00
OFF
023
5.0 W
Alignment Setup