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Icom IC-22S, Instruction Manual

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Icom IC-22S Instruction Manual Download Page 21

Icom IC-22S PLL Synthesized 2-Meter Transceiver 

Instruction Manual and Service Notes 

 

21

 

 

Voltage Chart 

 

 

Transmit 

Receive 

 

Part 

Base 
Gate 1 

Gate 2 

Collector 
Drain 

Emitter  
Source 

Base 
Gate 1 

Gate 2 

Collector 
Or Drain 

Emitter  
Source 

Comments  

Q1 

0.20V 

 

-25.0V 

0.26V 

8.2V 

 

6.8V 

8.2V 

 

Q2 

 

 

 

 

0 

4.3V 

8.1V 

0.24V 

 

Q3 

 

 

 

 

0 

0 

9.1V 

E 

 

Q4 

 

 

 

 

0 

 

8.0V 

1.3V 

 

Q5 

 

 

 

 

1.85V 

 

9.6V 

1.7V 

 

Q6 

 

 

 

 

0.67V 

 

2.45V 

E 

 

Q7 

 

 

 

 

5.0V 

 

6.6V 

4.7V 

 

Q8 

0.00V 

 

9.60V 

0.00V 

1.35V 

 

5.1V 

1.0V 

Squelch Open 

Q9 

 

 

 

 

2.4V 

 

9.3V 

3.2V 

 

Q10 

5.90V 

 

9.60V 

5.50V 

6.1V 

 

9.7V 

5.7V 

 

Q11 

0.05V 

 

13.80V 

E 

0.75V 

 

0.35V 

E 

Squelch Closed  

Q12 

0.65V 

 

0.75V 

E

 

0 

 

8.0V 

E 

 

Q13 

 

 

 

 

1.35V 

 

5.8V 

0.8V 

 

Q14 

 

 

 

 

1.35V 

 

9.4V 

0.75V 

 

Q15 

0.26V 

 

12.9V 

0.90V 

0 

 

13.5V 

0.7V 

 

Q16 

12.9V 

 

6.60V 

13.70V 

13.5V 

 

13.8V 

13.8V 

 

Q17 

-0.125V 

 

13.70V 

E 

0 

 

13.8V 

E 

 

Q18 

-0.4V 

 

13.70V 

E 

 

 

13.8V 

E 

 

Q19 

0.85V 

 

7.20V 

0.18V 

 

 

13.8V 

0 

 

Q20 

0.02V 

 

0.95V 

E 

 

 

 

 

 

Q21 

0.60V 

 

0.26V 

9.70V 

 

 

 

 

 

Q22 

0.00V 

4.60V 

8.40V 

0.26V 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q24 

4.70V 

 

9.70V 

4.20V 

 

 

 

 

 

Q25 

5.70V 

 

9.60V 

5.40V 

 

 

9.6V 

5.4V 

 

Q26 

0.70V 

 

1.65V 

“E” 

 

 

1.65V 

E 

 

Q27 

0.65V 

 

0.70V 

“E” 

 

 

0.70V 

E 

 

Q28 

0.55V 

 

0.65V 

“E” 

 

 

0.65V 

E 

 

Q29 

0.83V 

 

7.70V 

8.80V 

 

 

7.7V 

8.8V 

 

Q30 

0.84V 

 

8.10V 

7.9V 

 

 

8.1V 

7.9V 

 

Q31 

10.30V 

 

12.60V 

9.7V 

 

 

12.7V 

9.7V 

 

Q32 

10.30V 

 

12.90V 

9.7V 

 

 

13.8V 

0.35V 

 

Q33 

0.75V 

 

10.30V 

0.26V 

 

 

0.85V 

0.85V 

 

Q34 

0.85V 

 

13.70V 

0.26V 

 

 

12.9V 

9.7V 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for IC-22S

Page 1: ...Icom IC 22S PLL Synthesized 2 Meter Transceiver Instruction Manual and Service Notes...

Page 2: ...dance 50 ohms Number of Channels 23 channels selected from any of the 132 channels on 15 KHz spacing Frequency Control Stabilized master oscillator PLL programmed by diode matrix TRANSMITTER Power Out...

Page 3: ...ial frequency stability Twenty two 22 channels are provided for operating convenience and versatility High Q stages provide minimum interstage spurious response A low pass filter is placed at the outp...

Page 4: ...d to these deficiencies If an AC power supply other than the matching supply is used with your transceiver make certain it is adequately regulated for both voltage and current Low voltage while under...

Page 5: ...crophone A high quality dynamic microphone is supplied with your transceiver Merely plug it into the proper receptacle on the front panel Should you wish to use a different microphone make certain it...

Page 6: ...cathode pointing UP The cathode lead is bent down to go through the board to connect to the other side After the diodes have been inserted for the channel turn the board over carefully so as to not ha...

Page 7: ...e mode and relative RF output in transmit mode The meter face is illuminated with a white lamp when the transceiver is switched on Channel Selector Selects one of 22 channels C O S lamp Also shows out...

Page 8: ...ust the volume control to a comfortable listening level of noise if no signal is present Carefully adjust the squelch control clockwise until the noise just disappears This is the proper squelch thres...

Page 9: ...eedback circuit connects to ground serves for adjusting the operating point of Q26 and insuring symmetry of clipped waveforms Dl 8 and D19 are temperature compensating elements for the 3 stage DC circ...

Page 10: ...handled in this stage is particularly high use is make of an aluminum die cast radiator which is in direct contact with the rear chassis and serves to keep the transistor temperature low in order to i...

Page 11: ...red audio signals are adjusted to level by the volume control and amplified to I watt power by IC 2 Squelch At point J 5 higher frequency discriminator noise is taken at a selected level by the R1 squ...

Page 12: ...ince maximum operating frequency of ICI is low of 1C6 whose operating frequency is high divides the Q6 output frequency by 2 to give signals of approximately 3 MHz or less which are supplied to the pr...

Page 13: ...equal to VCC of Pin 5 when reference pulses and divider output have the same frequency When these inputs to 1C2 are not phase locked they have a width proportional to the phase difference of the inpu...

Page 14: ...F 2nd LO and noise amplification circuits The 9 V for transmit is similarly taken from emitter follower circuit Q32 from the clamp circuit constituted by Ri43 D22 D21 and is supplied to the IDC 10 7 M...

Page 15: ...0 0 0 0 144 645 17 145 245 144 045 0 0 0 1 0 0 0 1 144 660 18 145 260 144 060 0 0 0 1 0 0 1 0 144 675 19 145 275 144 075 0 0 0 1 0 0 1 1 144 690 20 145 290 144 090 0 0 0 1 0 1 0 0 144 705 21 145 305...

Page 16: ...0 0 1 1 1 1 0 1 145 320 62 145 920 144 720 0 0 1 1 1 1 1 0 145 335 63 145 935 144 735 0 0 1 1 1 1 1 1 145 335 63 145 935 144 735 0 0 1 1 1 1 1 1 145 350 64 145 950 144 750 0 1 0 0 0 0 0 0 145 365 65 1...

Page 17: ...0 1 0 145 995 107 146 595 145 395 0 1 1 0 1 0 1 1 146 010 108 146 610 145 410 0 1 1 0 1 1 0 0 146 025 109 146 625 145 425 0 1 1 0 1 1 0 1 146 040 110 146 640 145 440 0 1 1 0 1 1 1 0 146 055 111 146 65...

Page 18: ...0 1 1 0 0 1 146 700 154 147 300 146 100 1 0 0 1 1 0 1 0 146 715 155 147 315 146 115 1 0 0 1 1 0 1 1 146 730 156 147 330 146 130 1 0 0 1 1 1 0 0 146 745 157 147 345 146 145 1 0 0 1 1 1 0 1 146 760 158...

Page 19: ...0 0 0 1 1 0 147 375 199 147 975 146 775 1 1 0 0 0 1 1 1 147 390 200 147 990 146 790 1 1 0 0 1 0 0 0 147 405 201 148 005 146 805 1 1 0 0 1 0 0 1 147 420 202 148 020 146 820 1 1 0 0 1 0 1 0 147 435 203...

Page 20: ...1 0 1 1 0 0 147 945 237 148 545 147 345 1 1 1 0 1 1 0 1 147 960 238 148 560 147 360 1 1 1 0 1 1 1 0 147 975 239 148 575 147 375 1 1 1 0 1 1 1 1 147 990 240 148 590 147 390 1 1 1 1 0 0 0 0 148 005 241...

Page 21: ...Q11 0 05V 13 80V E 0 75V 0 35V E Squelch Closed Q12 0 65V 0 75V E 0 8 0V E Q13 1 35V 5 8V 0 8V Q14 1 35V 9 4V 0 75V Q15 0 26V 12 9V 0 90V 0 13 5V 0 7V Q16 12 9V 6 60V 13 70V 13 5V 13 8V 13 8V Q17 0 1...

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