VXA-150
Alignment
Vertex Standard Co., Ltd.
2
Required Test Equipment
Required Test Equipment
Required Test Equipment
Required Test Equipment
R
Radio Tester with calibrated output level at 200 MHz
R
In-line Wattmeter with 5% accuracy at 200 MHz
R
50-
Ω
, 10-W RF Dummy Load
R
Regulated DC Power Supply adjustable from 3 to 15 VDC, 2A
R
Frequency Counter: ±0.2 ppm accuracy at 200 MHz
R
AF Signal Generator
R
AC Voltmeter
R
DC Voltmeter: high impedance
R
VHF Sampling Coupler
Alignment Preparation & Precautions
Alignment Preparation & Precautions
Alignment Preparation & Precautions
Alignment Preparation & Precautions
A 50-
Ω
RF load and in-line wattmeter must be connected to the main antenna jack in
all procedures that call for transmission, except where specified otherwise. Correct
alignment is not possible with an antenna. After completing one step, read the next
step to see if the same test equipment is required. If not, remove the test equipment
(except dummy load and wattmeter, if connected) before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the
transceiver and test equipment, and that this temperature be held constant between
20~30 °C (68-86 °F). When the transceiver is brought into the shop from hot or cold air,
it should be allowed some time to come to room temperature before alignment.
Whenever possible, alignments should be made with oscillator shields and circuit
boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up
before beginning.
Set up the test equipment as shown below for transceiver alignment, apply 7.2 VDC
power to the transceiver. Refer to the drawings for Alignment Points.
PLL Reference Frequency
PLL Reference Frequency
PLL Reference Frequency
PLL Reference Frequency
R
Connect the wattmeter, dummy load and frequency counter connected to the
antenna jack, and tune the transceiver to 120.000 MHz.
R
Transmit, and adjust
TC1001
on the RF Unit, if necessary, so the counter
frequency is 120.000 MHz (±100 Hz).
