Vertex Standard VX-160U User manual

VX-160U/180U
Alignment
1
VX-160U/180U Alignment
VX-160U/180U AlignmentVX-160U/180U Alignment
VX-160U/180U Alignment
The VX-160U/180U has been carefully aligned at the factory for the specified
performance across the frequency range specified for each version. Re-alignment should
therefore not be necessary except in the event of component failure, or altering version
type. All component replacement and service should only be performed by an authorized
VERTEX STANDARD representative, or the warranty policy may be void.
Required Test Equipment
Required Test EquipmentRequired Test Equipment
Required Test Equipment
CT-42 Programming Cable with CE44 Channel Programming Diskette
RF Signal Generator with calibrated output level at 1GHz
Deviation Meter (Linear Detector)
AC Voltmeter
SINAD Meter
In-Line wattmeter with 5 % accuracy at 500 MHz
Regulated DC Power Supply adjustable from 4 to 10 V, 3 A
50ΩNon-reactive Dummy Load: 10 W at 500 MHz
Frequency Counter: ±0.2 ppm accuracy at 500 MHz
AF Signal Generator
DC Voltmeter: high impedance
Before beginning alignment, connect the transceiver and PC using the CT-42
Programming Cable, and run the CE44 Channel Programming Diskette, then download
the EEPROM data from the transceiver to the computer.
Then store this data in a disk file so that it can be uploaded when alignment is finished.
You should find the corresponding data file on the computer disk for the transceiver
version you are aligning, containing channel settings for the high edge, middle and low
edge of the transceiver’s frequency range in channels 1, 2 and 3, respectively. Up-load
this file to the transceiver.
Low Band Edge (Channel 1): 400.000 MHz
Band Center (Channel 2): 415.000 MHz
High Band Edge (Channel 3): 430.000 MHz
Note
NoteNote
Note : Signal levels in dB referred in the alignment procedure are based on 0dBµ = 0.5
µV.

VX-160U/180U
Alignment
2
PLL & Transmitter
PLL & TransmitterPLL & Transmitter
PLL & Transmitter
Set up the test equipment as shown for transmitter alignment. Adjust the supply
voltage to 7.2 V for all steps where not specified otherwise.
PLL VCV (Varactor Control Voltage)
Connect the DC voltmeter between TP03 on the Main Unit and ground.
Set the transceiver to CH 3 (high band edge), and adjust L1004 on the Main Unit
for 4.1 V ± 0.1 V on the DC voltmeter.
Set the transceiver to CH 1 (low band edge), and confirm the low-end VCV is more
than 1.1 V while transmitting, and also while receiving.
PLL Reference
Set the transceiver to CH 2 (band center).
Open the “Adjust
AdjustAdjust
Adjust” window on the CE44, then select “Reference
ReferenceReference
Reference” parameter.
Press the [ENTER]key to enable programming of this parameter, use the [UP] or
[Down] arrow keys so that the frequency counter displays band center frequency
±100 Hz (for the version being aligned).
Transmitter Output Power
Set the transceiver to CH 2 (band center).
Open the “Adjust
AdjustAdjust
Adjust” window on the CE44, then select “TX Hi Power
TX Hi PowerTX Hi Power
TX Hi Power” parameter.
Press the [ENTER]key to enable programming of this parameter, use the [UP] or
[Down] arrow keys so that the power meter reading is 5 W. Confirm that the
current consumption is 2.0 A or below.
Select “TX Low Power” parameter.
Press the [ENTER]key to enable programming of this parameter, use the [UP] or
[Down] arrow keys so that the power meter reading is 1 W. Confirm that the
current consumption is 1.0 A or below.
Modulation Level
Set the transceiver to CH 2 (band center).
Inject a 1 kHz tone at 77 mVrms to the MIC jack.
Open the “Adjust
AdjustAdjust
Adjust” window on the CE44, then select “Modulation
ModulationModulation
Modulation” parameter.
Press the [ENTER]key to enable programming of this parameter, use the [UP] or
[Down] arrow keys so that the deviation meter reading is ±4.2 kHz (for 25 kHz
steps) or ±2.1 kHz (for 12.5 kHz steps) deviation.

VX-160U/180U
Alignment
3
Receiver
Set up the test equipment as shown for receiver alignment.
Sensitivity
Set the transceiver to CH 3 (high band edge)
Tune the RF signal generator to the same frequency of the transceiver, then set the
generator output level to 40 µV with ±3.0 kHz deviation @ 1 kHz tone modulation.
Open the “Adjust” window on the CE44, then select “Sensitivity” parameter.
Press the [ENTER]key to enable programming of this parameter, use the [UP] or
[Down] arrow keys so that the RF signal generator output level should be –7dB or
less for 12 dB SINAD.