Yaesu GX1280S User manual

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
1
GX1280S Alignment
The GX1280S has been carefully aligned at the factory for the specified performance
across the marine band.
Realignment should therefore not be necessary except in the event of a component
failure. All component replacement and service should be performed only by an
authorized Standard Horizon representative, or the warranty policy may be voided.
The following procedures cover the sometimes critical and tedious adjustments that
are not normally required once the transceiver has left the factory. However, if damage
occurs and some parts 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 Standard Horizon
service technicians who are experienced with the circuitry and fully equipped for repair
and alignment. Therefore, if a fault is suspected, contact the dealer from whom the
transceiver was purchased for instructions regarding repair. Authorized Standard
Horizon service technicians realign all circuits and make complete performance checks
to ensure compliance with factory specifications after replacing any faulty components.
Those who do undertake any of the following alignments are cautioned to proceed at
their own risk. Problems caused by unauthorized attempts at realignment are not
covered by the warranty policy. Also, Standard Horizon, a division of VERTEX
STANDARD, must reserve the right to change circuits and alignment procedures in
the interest of improved performance, without notifying owners. 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 the need for
realignment determined to be absolutely necessary.
The following test equipment (and thorough familiarity with its correct use) is
necessary for complete realignment. Correction of problems caused by misalignment
resulting from use of improper test equipment is not covered under the warranty policy.
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 single 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.
Required Test Equipment
RF Signal Generator with calibrated output level at 200 MHz
Deviation Meter (linear detector)
AF Millivoltmeter
SINAD Meter

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
2
Inline Wattmeter with 5% accuracy at 200 MHz
Regulated DC Power Supply: 13.8 VDC, 10A
50-ohm Non-reactive Dummy Load: 30W at 200 MHz
Frequency Counter: >0.1 ppm accuracy at 200 MHz
AF Signal Generator
DC Voltmeter: high impedance
VHF Sampling Coupler
AF Dummy Load: 4 Ohms, 10 W
Oscilloscope
Spectrum Analyzer
GX1260S Marine Transceiver
Alignment Preparation & Precautions
A dummy load and inline wattmeter must be connected to the main antenna jack in
all procedures that call for transmission. 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, 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°C and 30°C (68°F and 86°F). When the transceiver is brought into the shop from hot
or cold air it should be allowed some time for thermal equalization with the
environment before alignment. If 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 this procedure are based on 0 dBµ = 0.5 µV
(closed circuit).
Overview of Test Mode
The test mode has been build in the microprocessor in order to adjust and confirm
the performance of transceiver.
The purpose is to adjust transceiver simply and to confirm the performance of
transceiver smoothly.
(a) Expansion channels “EXP01 - EXP07” will be set as follows:

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
3
DISPLAY RX Frequency TX Frequency SCAN Channel
EXP01 156.050 MHz 156.050 MHz X
EXP02 --- 157.425 MHz X
EXP03 163.275 MHz --- X
EXP04 155.050 MHz 155.050 MHz O
EXP05 162.025 MHz 162.025 MHz X
EXP06 163.575 MHz 158.975 MHz X
WX10 163.275 MHz --- O
(B) In CH70, ever time you are in transmit mode, (every time you press PTT), the
following test tone can be outputted:
1st transmission: Synthetic tone of 1300 Hz and 2100 Hz
2nd transmission: 1300 Hz
3rd transmission:2100 Hz
4th transmission:No Modulation
5th transmission:Return to 1st transmission
(C) Scan the channels between WX10 and EXP04 in the SCAN mode.
Starting Test Mode
Confirm that turn off the transceiver, and short the TEST points. Press the PWR/VOL
switch while press and holding the DIST and DW keys.
Confirmation of VCO
-- Confirmation --
Connect the DC voltmeter to the test point (LOCK TP).
Use the UP/DOWN key to set the channel to EXP04, confirm that voltage on the
test point is over 1.0 V in the receive and transmit mode.
Use the UP/DOWN key to set the channel to EXP05, confirm that voltage on the
test point is below 5.0 V in the transmit mode.
Use the UP/DOWN key to set the channel to EXP06, confirm that voltage on the
test point is below 5.0 V in the receive mode.
Adjustment and Confirmation of Transmit Power
Adjust power at high and low in the transmit mode, and confirm power in the specified
bandwidth.
-- Adjustment – High Power Setting --
Connect the wattmeter and 50-ohm dummy load to the antenna jack.
Press the SCAN key, then appear |ALIGNMENT | on display.
|01:HI PO |
|DATA:xxx |
With the PTT switch pressed, rotate the dial knob so that RF power is 25 W, then

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
4
press CALL/SEL key.
-- Adjustment – Low Power Setting --
Connect the wattmeter and 50-ohm dummy load to the antenna jack.
Press the SCAN key, then appear |ALIGNMENT | on display.
|02:LO PO |
|DATA:xxx |
With the PTT switch pressed, rotate the dial knob so that RF power is 1 W, then
press CALL/SEL key.
Then, press DISTRESS key to enable the above settings.
-- Confirmation --
Use the H/L key to set transceiver to high power and set the channel to EXP01.
With the PTT switch pressed, confirm that RF power is between 23 W and 27 W.
Use the H/L key to set transceiver to low power. With the PTT switch pressed,
confirm that RF power is between 0.5 W and 1.0 W.
As descried above, confirm RF power at EXP04 and EXP05. Set transceiver to high
power and confirm that RF power is between 23 W and 27 W. Set transceiver to
low power and confirm that RF power is between 0.5 W and 1.0 W.
Adjustment of PLL Frequency
Adjust the frequency in the transmit mode and local frequency in the receive mode.
-- Adjustment --
Setup the test equipment as shown below.
Set the channel to CH16. With the PTT switch pressed, adjust TC1001 so that RF
frequency is 156.80000 MHz ± 50 Hz.
Adjustment and Confirmation of Deviation
Adjust deviation in the transmit mode.
-- Adjustment --
Setup the test equipment as shown below.
Set the channel to CH16.
Set the output of the audio generator (AG) to 1 KHz and 100 mV.
With the PTT switch pressed, adjust VR1001 so that the maximum deviation is
±4.5 KHz.
Decrease the output level of AG by 20 dB (the output level of AG should be 1/10).
With the PTT switch pressed, adjust the output level of AG so that the deviation is
±3.0 KHz.
Increase the output level of AG by 20 dB (10 times of the output level of AG) which
is supposed to be Detective Modulation Level ±4.5 KHz).

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
5
Repeat steps 3 though 6 three times so that deviation is ±3.0 KHz and the
maximum deviation is ±4.4 KHz to ±4.6 KHz.
-- Confirmation --
Set the output of the AG to 1 KHz and 150 mV.
Set the channel to EXP01, confirm that maximum deviation is between ±4.3 KHz
and ±5.0 KHz.
Set the channel to EXP02, confirm that maximum deviation is between ±4.3 KHz
and ±5.0 KHz.
Set the channel to EXP04, confirm that maximum deviation is between ±4.0 KHz
and ±5.0 KHz.
Set the channel to EXP05, confirm that maximum deviation is between ±4.0 KHz
and ±5.0 KHz.
Adjustment of Receiver Front-end
Adjust the receiver front-end coil.
-- Adjustment --
Setup the test equipment as shown below.
Set the center frequency of t he spectrum analyzer to 159.00 MHz, set SPAN to
20.00 MHz, set RBW and VBW to 30 KHz, and set SWP to 56 ms.
Adjust T1001, T1002, T1003, T1004, and T1005 until the wave form shown in
below is obtained.
Note: Adjust the output of the tracking generator so that RF AMP and spectrum
analyzer will not saturate.
Figure shows the reference wave form. The wave form varies with measuring
instruments. It is impotent to take the lowest possible value at the stop band near 150
MHz and the highest possible value at the band near 156 MHz.
Each coil shall be adjusted at the range between the initial condition and right and left
revolving.
GX1255S-FRONT-END
ATTEN 20dB
RL 10.0dBm 10dB/
CENTER 159.00 MHz
*RBW 30 kHz VBW 30 kHz
SPAN 20.00 MHz
SWP 56.0 ms

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
6

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
7
Confirmation of Weather Alert Tone
In the weather channel mode, when transceiver receives the specific emergency tone
(1050 Hz), weather alert tone will be output (Weather Alert Operation). The Weather
Alert mode will be active when a NOAA weather channel is in memory and radio is in
memory scan or P-scan mode.
-- Confirmation --
Connect the standard signal generator (SSG) to the antenna jack.
Squelch position set to tight.
Press the SCAN key and start to Memory Scan mode.
Set the SSG to 163.275 MHz (WX10) and output level of the SSG to 20 dBµV, ±3.0
KHz deviation with 1050 Hz tone modulation.
Set the output of the SSG to ON.
Confirm that the channel of transceiver stops at WX10 and the transceiver outputs
the weather alert tone (1050 Hz).
Confirmation of receiver NMEA data
Input NMEA format data output from GPS receiver to NMEA terminal A of
transceiver and display it to the LCD of the transceiver.
NMEA format data output from GPS receiver is applied to NMEA terminal of
transceiver’s option connector and LCD of transceiver will show data.
-- Confirmation --
Setup the test equipment as shown below.
Press and hold the H/L key, confirm that the position data is displayed on the LCD
of transceiver.
Confirmation of DSC Operation
-- Confirmation --
Prepare the confirmation transceiver (GX1260S).
Input below data to the confirmation transceiver in advance.
-Input “TEST” to NAME of INDIVIDUAL DIRECTORY
-Input “123456789” to MMSI of INDIVIDUAL DIRECTORY
-Input “123456780” to local MMSI
-Channel 13 in U.S.A. mode
Setup the test transceiver as follows:
-Channel 21 in U.S.A.
In 3 seconds, send the INDIVIDUAL CALL from the conformation transceiver.
Confirm that the test transceiver receives the INDIVIDUAL CALL from the
conformation transceiver and outputs the beep.
Press the CALL/SET key of the test transceiver and turn off the beep.

FCC ID: K66GX1280S
Alignment
Vertex Standard Co,. Ltd.
8
Simultaneously, confirm that “123456780” of conformation transceiver’s MMSI is
displayed in the LCD of the test transceiver.
Confirm that the conformation transceiver receives the response from the test
transceiver and outputs beep.
Press the CALL/SET key of the conformation transceiver and turn off the beep.
Simultaneously, confirm that “TEST” of test transceiver’s MMSI is displayed in
the LCD of the conformation transceiver.