VX-1210
Alignment
2
Alignment Preparation & Precautions
A 50
Ω
RF Dummy Load and in-line wattmeter must be connected to the ANT 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 following step to determine whether the same test equipment
will be required. If not, remove the test equipment (except dummy load and wattmeter, in connected)
before proceeding.
Correct alignment requires that the ambient temperature be the same as that of the repeater and test
equipment, and that this temperature be held constant between 20
º
and 30
°
C (68
º
~ 86
°
F). When
the repeater is brought into the shop from hot or cold air, it should be allowed 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.
Note:
Signal levels in dB referred to in the alignment procedure are based on 0dBµ = 0.5µV.
Set up the test equipment as shown below, and apply 13.8V DC power to the transceiver.
The VX-1210 must be programmed for use in the intended system before alignment is attempted.
The frequency and other parameters are loaded from the file during the alignment process.
In order to facilitate alignment over the complete switching range of the equipment it is
recommended that the channel data first be uploaded and then stored to disk. Alignment Channel
data should then be downloaded. The original data can be replaced at the end of the alignment
process.
PLL Alignment
PLL Reference Frequency Alignment
r
Remove the coaxial plug from J2009 on the CNTL Unit, and connect the Frequency Counter to
J2009.
r
Adjust TC2001 on the CNTL Unit for 36.355 MHz
±
10 Hz on the frequency Counter.
2nd Local Output Level
r
Disconnect the Frequency Counter, and connect the RF millivoltmeter to J2009.
r
Confirm that the output level is 0 dBm
±
2dB on the RF millivoltmeter.
r
Disconnect the RF millivoltmeter, and replace the plug into J2009.
Carrier Output Level
r
Remove the coaxial plug from J2008 on the CNTL Unit, and connect the RF millivoltmeter to
J2008.
r
Select the
“
VCO1 U
”
channel (8.99999 MHz, USB), and confirm that the output level is
–
5.5
dBm
±
2 dB.
r
Disconnect the RF millivoltmeter, and replace the plug into J2008.
VCO VCV Alignment
r
Connect the DC voltmeter to TP2005 on the CNTL Unit, and referring Table below, turn the
transceiver to each channel listed. Then adjust the listed component for the required voltage or
confirm that the correct voltage is present.
