Vertex Standard VXA-150 Reference manual

VXA-150

Alignment

Vertex Standard Co., Ltd.

Introduction

IntroductionIntroduction

Introduction

The VXA-150 is carefully aligned at the factory for the specified performance across

the Aircraft and Weather bands. Realignment should therefore not be necessary except

in the event of a component failure.

The following procedures cover the adjustments that are not normally required once

the transceiver has left the factory. However, if damage occurs and some parts

subsequently are replaced, realignment may be required. If a sudden problem occurs

during normal operation, it is likely due to component failure; realignment should not

be done until after the faulty component has been replaced.

We recommend that servicing be performed only by authorized Vertex Standard

service technicians who are experienced with the circuitry and fully equipped for

repair and alignment. If a fault is suspected, contact the dealer from whom the

transceiver was purchased for instructions regarding repair. Under no circumstances

should any alignment be attempted unless the normal function and operation of the

transceiver are clearly understood, the cause of the malfunction has been clearly

pinpointed and any faulty components replaced, and realignment determined to be

absolutely necessary. Problems caused by unauthorized attempts at realignment are

not covered by the warranty policy

Vertex Standard reserves the right to change circuits and alignment procedures, in the

interest of improved performance, without notifying owners.

The following test equipment (and familiarity with its use) is necessary for complete

realignment. While most steps do not require all of the equipment listed, the

interactions of some adjustments may require that more complex adjustments be

performed afterwards. Do not attempt to perform only a signal step unless it is clearly

isolated electrically from all other steps. Have all test equipment ready before

beginning, and follow all of the steps in a section in the order presented.

Correction of problems caused by misalignment resulting from use of improper test

equipment is not covered under the warranty policy.

Note: Signal levels in dB refereed to in this procedure are based on 0 dBµ = 0.5 µV

(closed circuit).

VXA-150

Alignment

Vertex Standard Co., Ltd.

Required Test Equipment

Required Test EquipmentRequired Test Equipment

Required Test Equipment

RRadio Tester with calibrated output level at 200 MHz

RIn-line Wattmeter with 5% accuracy at 200 MHz

R50-Ω, 10-W RF Dummy Load

RRegulated DC Power Supply adjustable from 3 to 15 VDC, 2A

RFrequency Counter: ±0.2 ppm accuracy at 200 MHz

RAF Signal Generator

RAC Voltmeter

RDC Voltmeter: high impedance

RVHF Sampling Coupler

Alignment Preparation & Precautions

Alignment Preparation & PrecautionsAlignment Preparation & Precautions

Alignment Preparation & Precautions

A 50-ΩRF 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 FrequencyPLL Reference Frequency

PLL Reference Frequency

RConnect the wattmeter, dummy load and frequency counter connected to the

antenna jack, and tune the transceiver to 120.000 MHz.

RTransmit, and adjust TC1001 on the RF Unit, if necessary, so the counter

frequency is 120.000 MHz (±100 Hz).

VXA-150

Alignment

Vertex Standard Co., Ltd.

TX Power Adjustment

TX Power AdjustmentTX Power Adjustment

TX Power Adjustment

RConnect the wattmeter and dummy load to the antenna jack, and tune the

transceiver to 128.000 MHz.

RTransmit, and adjust VR1003 to obtain 1.5 W RF (carrier) power indicated on the

wattmeter (without audio modulation input).

TXTX

TX Modulation Adjustment

Modulation AdjustmentModulation Adjustment

Modulation Adjustment

RConnect the Radio Tester to the antenna jack, then adjust the AF generator output

level for injection of 200 mV rms @ 1 kHz to the MIC jack. Leave the transceiver

tuned to 127.500 MHz.

RTransmit, and adjust VR1002 to obtain 85 % modulation (±3 %) as indicated on the

Radio Tester.

RReduce the AF generator output level to 20 mV rms, then adjust VR1001 to obtain

30 % modulation (±3 %) on the Radio Tester.

Internal System Alignment Routine

Internal System Alignment RoutineInternal System Alignment Routine

Internal System Alignment Routine

This feature uses a programmed routine in the transceiver which replaces many

previously-complex discrete component settings and adjustments with digitally-

controlled settings via the CHANNEL selector knob. Transceiver adjustments include:



Squelch Hysteresis Adjustment



Squelch Threshold Adjustment



Squelch “Tight” Adjustment

To begin, set the transceiver to 127.500 MHz, and turn the transceiver off. Then, press

and holding the LAMP switch, PTT switch and the CHANNEL selector knob while

turning the transceiver on.



Squelch Hysteresis Adjustment (HSSQ)

Press the CHANNEL selector knob, then select the squelch hysteresis level

using the CHANNEL selector knob.

Next, press the CHANNEL selector knob.

Rotate the CHANNEL selector knob to select the next setting.



Squelch Threshold Adjustment (THSQ)

Inject a –9 dBµ (0.35 µV) RF signal (with a standard modulation: 30 % AM

modulation @ 1 kHz), then press the CHANNEL selector knob

twice

Now rotate the CHANNEL selector knob to select the next setting.

VXA-150

Alignment

Vertex Standard Co., Ltd.



Squelch “Tight” Adjustment (TISQ)

Increase the RF signal level to +15 dBµ (5.6 µV), then press the CHANNEL

selector knob

twice

Press and hold the in the CHANNEL selector knob for 2 second to save all

setting and exit.

Resetting the CPU

Resetting the CPUResetting the CPU

Resetting the CPU

If you are unable to gain control of the transceiver (or if you want to clear all memories

and settings to their factory defaults), press and holding the MONITOR button and PTT

switch while turning the transceiver on.

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