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FCC ID: K6630323X30 

   

IC ID: 511B-30323X30 

Alignment 

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Vertex Standard Co., Ltd.

 

HX750S Alignment 

 
   
 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 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 

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Radio Tester with calibrated output level at 200 MHz 

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In-line Wattmeter with 5% accuracy at 200 MHz 

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50 

Ω

, 10 W RF Dummy Load 

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

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Frequency Counter: ±0.2 ppm accuracy at 200 MHz 

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AF Signal Generator 

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AC Voltmeter 

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DC Voltmeter: high impedance 

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VHF Sampling Coupler 

 

Alignment Preparation & Precautions 

A 50 

Ω

 RF 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 

Summary of Contents for HX750S

Page 1: ...nts 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 interactio...

Page 2: ...enna jack Set the transceiver to CH16 156 800 MHz then turn the transceiver off Press and hold in the PTT SQL and key while turn the transceiver on to enter the alignment mode Press the or key to select the display to HS xx Press the MEM key to enable adjustment of this Alignment Mode Press the or key to adjust the hysteresis level Press the MEM key to save the new setting Squelch Threshold Adjust...

Page 3: ...he transceiver to CH16 156 800 MHz with Low power mode and then turn the transceiver off Press and hold in the PTT SQL and key while turn the transceiver on to enter the alignment mode Press the or key to select the display to n PO xx Press the MEM key to enable adjustment of this Alignment Mode Press the PTT key to transmit the transceiver if necessary press the or key to adjust the output power ...

Page 4: ...nter the alignment mode Press the or key to select the display to n OD xx Press the MEM key to enable adjustment of this Alignment Mode Press the PTT key to transmit the transceiver if necessary press the or key to adjust the deviation to 4 2 kHz 0 2 kHz Press the MEM key to save the new setting Press and hold the PWR key for 2 seconds to turn the Transceiver off ...

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