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FCC ID: K66GX1255S

Alignment

Vertex Standard Co,. Ltd.

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GX1255S 

GX1255S 

GX1255S 

GX1255S Alignment

Alignment

Alignment

Alignment

The 

GX1255S

 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

Required Test Equipment

Required Test Equipment

Required Test Equipment

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RF Signal Generator with calibrated output level at 200 MHz

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Deviation Meter (linear detector)

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AF Millivoltmeter

Summary of Contents for GX1255S

Page 1: ...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 notifyin...

Page 2: ...t 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 environmen...

Page 3: ... of VCO 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 EXP04 EXP04 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 EXP05 EXP05 EXP05 confirm that voltage on the test point is below 5 0 V in the transmit mode Use the UP DOWN...

Page 4: ...uency in the transmit mode and local frequency in the receive mode Adjustment Setup the test equipment as shown below Set the channel to CH16 CH16 CH16 CH16 With the PTT switch pressed adjust TC1001 so that RF frequency is 156 80000 MHz 50 Hz Adjustment and Confirmation of Deviation Adjustment and Confirmation of Deviation Adjustment and Confirmation of Deviation Adjustment and Confirmation of Dev...

Page 5: ...n 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 Note Note 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 ...

Page 6: ...ata Confirmation of receiver NMEA data Confirmation of receiver NMEA data 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...

Page 7: ...at 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 ...

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