Vertex Standard FT-7800R User manual

FCC ID: K6620165X40

IC IF: 511B-20165X40

Alignment

Vertex Standard Co., Ltd.

Introduction and Precautions

The FT-7800R has been carefully aligned at the factory for the specified performance

across the 144 MHz and 430 MHz amateur bands. 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 Yaesu 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 Yaesu 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 Yaesu 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, Yaesu 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.

FCC ID: K6620165X40

IC IF: 511B-20165X40

Alignment

Vertex Standard Co., Ltd.

Required Test Equipment

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.

Regulated DC Power Supply: adjustable from 10 to 17 VDC, 15 A

RF Signal Generator with calibrated output level at 500 MHz

Frequency Counter: ±0.1 ppm accuracy at 500 MHz

AF Signal Generator

SINAD Meter

Oscilloscope

Spectrum Analyzer

Deviation Meter (linear detector)

AF Milivoltmetr

AF Dummy Load: 4-Ohm, 5 W

DC Voltmeter: high impedance

Inline Wattmeter with 5% accuracy at 500 MHz

50-Ohm non-reactive Dummy Load: 100 watts at 500 MHz

VHF/UHF Sampling Coupler

Alignment Preparation & Precautions

A dummy load and inline 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 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 in the repair shop 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 °C to 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

FCC ID: K6620165X40

IC IF: 511B-20165X40

Alignment

Vertex Standard Co., Ltd.

oscillator shields and circuit boards firmly affixed in place. Also, the test equipment

must be thoroughly warmed up before beginning.

Notes: Signal levels in dB referred to in alignment are based on 0 dBµ = 0.5 µV.

All items tune and/or adjust by Auto-Tuning Mode or Manual Tuning Mode.

PLL Reference Frequency

With the wattmeter, dummy load and frequency counter connected to the antenna

jack.

Tune the transceiver 435.05 MHz and set the TX power level to low power mode.

Key the transceiver, adjust the counter frequency is within ±100 Hz of 435.05 MHz.

Transmitter Deviation

With the wattmeter, dummy load and deviation meter connected to the antenna

jack.

Inject a 1 kHz audio signal as a level of 80 mV to pin 5 of the MIC jack (pin 4 is

Ground).

Key the transmitter on 146.05/440.05 MHz. Adjust the frequency deviation is

within 4.0-4.4 KHz on the deviation meter.

CTCSS Deviation

With the wattmeter, dummy load and deviation meter connected to the antenna

jack.

Key the transmitter on 146.05/440.05 MHz. Adjust the frequency deviation is

within 0.65-0.75 KHz on the deviation meter.

DCS Deviation

With the wattmeter, dummy load and deviation meter connected to the antenna

jack.

Key the transmitter on 146.05/440.05 MHz. Adjust the frequency deviation is

within 0.50-0.60 KHz on the deviation meter.

FCC ID: K6620165X40

IC IF: 511B-20165X40

Alignment

Vertex Standard Co., Ltd.

Transmitter Power

With the power meter, dummy load and deviation meter connected to the antenna

jack.

Key the transmitter on 146.05 / 440.05 MHz. Adjust the output power is within 50

±0.5 W (144 MHz) / 40 ±0.5 W (430MHz) on the power meter. (HI)

Key the transmitter on 146.05 / 440.05 MHz. Adjust the output power is within 20

±0.5 W on the power meter. (MID2)

Key the transmitter on 146.05 / 440.05 MHz. Adjust the output power is within 10

±0.5 W on the power meter. (MID1)

Key the transmitter on 146.05 / 440.05 MHz. Adjust the output power is within 5

±0.5 W on the power meter. (LOW)

Receiver Sensitivity

With the dummy load and SINAD meter connected to the external speaker jack.

Inject a RF signal as a level of -7 dBµV to the antenna jack.

Tune the receiver on 146.05 / 440.05 MHz. Adjust the SINAD is above 12 dB on the

SINAD meter.

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