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FCC ID: K6630053X30

IC ID: 511B-30053X30

Alignment

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Vertex Standard Co,. Ltd.

GX1256S Alignment

The 

GX1256S

 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.

Summary of Contents for GX1256S

Page 1: ...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 ci...

Page 2: ...etermine 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 ho...

Page 3: ...transmission C Scan the channels between WX10 and EXP04 in the SCAN mode Starting Test Mode Confirm that PWR VOL switch is off and short the TEST points Turn on 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 o...

Page 4: ...cy 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 ...

Page 5: ...yzer 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 p...

Page 6: ...ta 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 t...

Page 7: ...I is displayed in the LCD of the test transceiver Confirm that the confirmation transceiver receives the response from the test transceiver and outputs beep Press the CALL SET key of the confirmation transceiver and turn off the beep Simultaneously confirm that TEST of test transceiver s MMSI is displayed in the LCD of the confirmation transceiver ...

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