PRESIDENT JOHNSON II Manuel utilisateur

JOHNSON II

SERVICE MANUAL

- TECNNICAL CHARACTERITICS

1 - GENERAL:

- Multiconfiguration (E, d, EU, EC, U, PL)

-E ⇒40 channels AM/FM 4W (from 26,965Mhz to 27,405Mhz)

-d ⇒80 channels FM 4W (from 26,565Mhz to 27,405Mhz)

40 channels AM 1W (from 26,965Mhz to 27,405Mhz)

-EU ⇒40 channels FM 4W/AM 1W (from 26,965Mhz to 27,405Mhz)

-EC ⇒40 channels FM 4W (from 26,965Mhz to 27,405Mhz)

-U ⇒40 channels FM 4W (from 26,965Mhz to 27,405Mhz)

40 channels FM 4W (from 27,60125Mhz to 27,99125Mhz)

-PL ⇒40 channels AM/FM 4W (from 26,960Mhz to 27,400Mhz)

-Channel step

-10KHz

-Class of emission

-AM(A3E)/FM(F3E)

- Power supply

-13,2V (from10,8V to 15,6V)

- Antenna impedance

- 50Ω

- Dimensions(in mm)

- 170(W)x150(D)x52(H)

- Weight

- 1Kg

2 - TRANSMISSION:

- Frequency allowance

-±300Hz

- Transmission interference

-Inferior to 4nW(-54dBm)

- Audio frequency response

-From 300Hz to 3kHz in AM/FM

- Emitted power in the adjacent channel

-Inferior to 20µW

- Microphone sensitivity

-Inferior to 10mV

-Current drain

-2A(in transmission mode with modulation)

- Modulated signal distortion

-Inferior to 2%

3 - RECEPTION:

-Maximum sensitivity at 20dB sinad

-0,5µV(-113dBm) AM/FM

-Audio frequency response

-From 300Hz to 3kHz in AM/FM

-Adjacent channel selectivity

-Superior to 60dB

-Frequency image rejection

-Superior to 60dB

-Intermodulation response

-Superior to 54dB

-Maximum audio power

-5W

-Squelch sensitivity

-Threshold 0,2µV(-120dBm)/Tight 1mV(-47dBm)

-Current drain

-400mA nominal/1000mA maximum

ALIGNMENT PROCEDURE

(JOHNSON II)

* VCO/PLL PORTION

- Alignment procedure

- Test points

- Frequencies chart

* TRANSMITTER

- Alignment procedure

- Test points

* RECEIVER

- Alignment procedure

- Test points

Test equipement required

Frequency counter 200 Mhz HF Generator

DCVolmeter BFVolmeter

Distortiometer HFVolmeter

Wattmeter - Dummy load Osilloscope

FM linear detector Load 8 Ω

AF generator Sinad meter

Conditions of Measurements on HF Generator

Reception

AM mode: Level - 107 dBm Frequency 1 KHz with 60% of modulation.

FM mode: Level - 107 dBm Frequency 1 KHz with 1,2KHz of deviation.

Transmission

Frequency1 KHz 30mV.

ALIGNMENT VCO/PLL

1 - Alignment procedure(13,2V;configuration”EU,E,d”)

STEP

CONDITION

ADJUSTMENT

REMARKS OF ADJUSTMENT

FM(EU,E)

TX mode

Channel 40

L302

Connect a voltmeter to TP 301,

adjust L302 to reach 2V±0,2V.

FM(EU,E)

RX mode

Channel 40

L301

Connect a voltmeter to TP 301,

adjust L301 to reach 2,3V±0,2V.

FM(EU,E)

TX/RX mode

Channel 1

Connect a voltmeter to TP 301,and check:

Rx Channel 1=2V±0,2V

Tx Channel 1=1,7V±0,2V

FM(EU,E)

RX mode

Channel 20

CT301

Connect a frequency counter to TP302,and

adjust CT301 to reach

37,900MHz.

FM(EU,E)

TX/RX mode

Channel 1 to 40

or 1 to 80(d)

Connect a frequency counter to TP302,and

check frequencies.

VCO/PLL ALIGNMENT POINTS

TP302

VCO/PLL ALIGNMENT POINTS

L301

L302

TP301

- FREQUENCY LIST (EU,E,EC)

Channels

Frequencies

(MHz)

VCO

Frequencies

(MHz)

1 26,965 37,660

2 26,975 37,670

3 26,985 37,680

4 27,005 37,700

5 27,015 37,710

6 27,025 37,720

7 27,035 37,730

8 27,055 37,750

9 27,065 37,760

10 27,075 37,770

11 27,085 37,780

12 27,105 37,800

13 27,115 37,810

14 27,125 37,820

15 27,135 37,830

16 27,155 37,850

17 27,165 37,860

18 27,175 37,870

19 27,185 37,880

20 27,205 37,900

21 27,215 37,910

22 27,225 37,930

23 27,255 37,950

24 27,235 37,930

25 27,245 37,940

26 27,265 37,960

27 27,275 37,970

28 27,285 37,980

29 27,295 37,990

30 27,305 38,000

31 27,315 38,010

32 27,325 38,020

33 27,335 38,030

34 27,345 38,040

35 27,355 38,050

36 27,365 38,060

37 27,375 38,070

38 27,385 38,080

39 27,395 38,090

40 27,405 38,100

- FREQUENCY LIST (PL)

Channels

Frequencies

(MHz)

VCO

Frequencies

(MHz)

1 26,960 37,655

2 26,970 37,665

3 26,980 37,675

4 27,000 37,695

5 27,010 37,705

6 27,020 37,715

7 27,030 37,725

8 27,050 37,745

9 27,060 37,755

10 27,070 37,765

11 27,080 37,775

12 27,100 37,795

13 27,110 37,805

14 27,120 37,815

15 27,130 37,825

16 27,150 37,845

17 27,160 37,855

18 27,170 37,865

19 27,180 37,875

20 27,200 37,895

21 27,210 37,905

22 27,220 37,915

23 27,250 37,945

24 27,230 37,925

25 27,240 37,935

26 27,260 37,955

27 27,270 37,965

28 27,280 37,975

29 27,290 37,985

30 27,300 37,995

31 27,310 38,005

32 27,320 38,015

33 27,330 38,025

34 27,340 38,035

35 27,350 38,045

36 27,360 38,055

37 27,370 38,065

38 27,380 38,075

39 27,390 38,085

40 27,400 38,095

- FREQUENCY LIST (U)

CEPT

Channels

Frequencies

(MHz)

VCO

Frequencies

(MHz)

1 26,965 37,660

2 26,975 37,670

3 26,985 37,680

4 27,005 37,700

5 27,015 37,710

6 27,025 37,720

7 27,035 37,730

8 27,055 37,750

9 27,065 37,760

10 27,075 37,770

11 27,085 37,780

12 27,105 37,800

13 27,115 37,810

14 27,125 37,820

15 27,135 37,830

16 27,155 37,850

17 27,165 37,860

18 27,175 37,870

19 27,185 37,880

20 27,205 37,900

21 27,215 37,910

22 27,225 37,930

23 27,255 37,950

24 27,235 37,930

25 27,245 37,940

26 27,265 37,960

27 27,275 37,970

28 27,285 37,980

29 27,295 37,990

30 27,305 38,000

31 27,315 38,010

32 27,325 38,020

33 27,335 38,030

34 27,345 38,040

35 27,355 38,050

36 27,365 38,060

37 27,375 38,070

38 27,385 38,080

39 27,395 38,090

40 27,405 38,100

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