Icom IC-201 Bedienungsanleitung

DL7MAJ, Oct 20th 2015

Page 1 (21)

ICOM IC-201 Allmode Transceiver

Alignment Procedure

Please note: This procedure is reengineered by myself and may be not in accordance with

the original procedure from the manufacturer!

So I can´t accept any claims from anybody in case of injuries, problems, damages and losses.

Usage of this procedure is at own risk!

Of course you may ask me or give hints for improvement.

DL7MAJ, Oct 20th 2015

Page 2 (21)

1) Mode „USB“

2) No microphone connected; „MIC GAIN“ control to CCW

3) „VOX“ On

4) Adjust R50 that VOX doesn´t trip (search for the point where VOX trips without

Modulation and set R50 shortly before this point.

5) Check that for all modes (FM, USB, LSB, CW)VOX doesn’t trip without modulation

6) “CAL” switched on, connect counter to CP1. Best use analog scope with Y-output

7) Wait 1 minute

8) Adjust frequency to 2,500000 MHz

DL7MAJ, Oct 20th 2015

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GIF

1) Receive “R”

2) Connect Counter (AC-coupled) to Emitter of Q14. Best use analog scope with Y-

output

3) Mode “USB” adjust C61 to 10,69850 MHZ (X1)

4) Mode “LSB” adjust C66 to 10,70150 MHz (X2)

5) There may be some interaction so repeat 3 and 4 if necessary

6) Mode “CW” frequency should remain at 10,70150 MHz (“RX”)

7) Transmit “T”

8) Mode “CW” frequency should move to nearly 10,70000 MHz (not more than +/-

500Hz)

9) Mode “FM” frequency should move to nearly 10,70000 MHz (not more than +/-

500Hz)

10) Note: At “FM” and receive “R” there is no output of BFO

11) Mode USB: Set R41 for just a little bit above S=0 (S-Meter just moves) on S-Meter

12) Tune in weak signal at 145,000MHz just enough to move S-Meter to S=5

13) Tune L1, L6, L8, L9, L10 for maximum

14) Tune in signal 50Mikrovolt 145,000MHz: Set R40 for S=9

15) Remove steps 11 and 14 if necessary

16) Mode “FM”

17) Adjust R1 on Main board near FM-Unit to S=9

18) Mode “USB”

19) Transmit “T”

20) Mode “USB” with PA operating (jumper P11/J11); adjust R66 for best carrier

suppression

21) Receive “R”

22) Connect AF signal (2kHz, 10mVpp) to MIC-Input

23) Set “MIC GAIN” to center position

24) Mode “USB”

25) Transmit “T”

26) Adjust output power with R69 to app.8 to 10W

27) Receive “R”

DL7MAJ, Oct 20th 2015

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DL7MAJ, Oct 20th 2015

Page 5 (21)

1) weak signal at 145,000MHz just enough to move S-Meter to S=5

2) Tune L1 Set “RF GAIN” to “H”; mac CW

3) Unmount RF-Module (two clamps at each end)

4) Tune in to L7 for maximum; L2 to L5 are only accessible from bottom

5) Mount RF-Module

6) If a big increase of sensitivity has been achieved, then repeat adjustment of S-Meter

(Look for GIF, step 14)

Note:

The resistor at the drain of Q1 (18Ohm) is a modification for damping oscillations in case

of badly matches antennas!

DL7MAJ, Oct 20th 2015

Page 6 (21)

Premix

1) “CAL”(Calibrator) switched off

2) Receive “R”, mode USB

3) Connect Counter (AC-coupled) to Collector of Q3. Best use analog scope with Y-

output

4) Connect DC-Voltmeter or Scope with 10:1 probe to common cathodes of D4 and D5.

5) “RIT” centered: Trim R8 for app. 0,3VDC

6) Set “Coarse” to 144 MHZ (simplex).

7) Measure frequency; should be app. 15,239 MHz.

8) Check: Tuning “RIT” should change frequency app. +/- 400 Hz –symmetrically to both

sides

9) If not readjust R8 and check again –back to 7)

10) “RIT” centered again.

11) Measure frequency; should be app. 15,239 MHz.

12) Switch to transmit “T”.

13) Adjust R9 for exactly same frequency as 10)

14) Switch to “R”, “RIT” centered

15) “Coarse” 144 MHz: Adjust C6 to exactly 15,239375 MHz (X2)

16) “Coarse” 145 MHz: Adjust C5 to exactly 15,364375 MHz (X1)

17) “Coarse” 145 MHz DUPLX: Switch to “T” and adjust C70 to exactly 15,289375 MHz

(X3)

18) Check: 145 MHz in DUPLEX is on “RX” same as in 15 (15,364375 MHz)

19) Recheck 15, 16 and 17 in “R” and “T”

20) Connect AF signal (2kHz, 10mVpp) to MIC-Input

21) Connect Scope to Pin 9 of IC1 (MC3301P)

22) Mode “FM”, Transmit “T”

23) Adjust R52 for symmetrical clipping at Pin 9 of IC1;

adjust amplitude with “MIC GAIN” and R53 if necessary

24) DC-Level at Pin 9 of IC1 should be app. 4,5 to 5,0VDC without AF-Input

25) Check that AF at Pin 9 of IC1 is just clipped

26) Connect Jumper P1 to J3 and adjust FM-Deviation with R61 to 5.0kHz

27) Connect Jumper P1 to J4 and adjust FM-Deviation with R62 to 2.5KHz (for narrow

band FM)

28) Switch back to receive “R”

29) Note: Maximum deviation with constant AF input will be at 2.4kHz due to phase

modulation and frequency response of IC1 (R57/R59/R60/C59/C60)

DL7MAJ, Oct 20th 2015

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DL7MAJ, Oct 20th 2015

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FM-IF

Alignment of FM-Unit can only be done outside the transceiver.

Use pins to connect supply (9V), Gnd, signals and meters acc. to the picture.

IMPORTANT:

An external trimmer R1 (10kOhm) has also to be connected, otherwise Q1 wouldn´t

operate.

1) Connect counter to TP2 (high impedance); frequency should be 10,245MHz +/-1kHz

Use analog scope, probe 10:1, with Y-output to connect the counter if available

2) Connect IF-Signal 10,700MHz, 1mV, unmodulated to pin 3 and 4(Gnd)

3) Connect DC-voltmeter to pin 10

4) Adjust L1 and L2 for max. negative AGC-voltage at pin 10; reduce amplitude of IF-

signalgenerator as far as possible to find the point of best sensitivity; try variation of

5) FM-modulate IF-signal with sinus 1kHz and 5kHz deviation

6) Connect scope to pin 9, AF audio

7) Connect DC-voltmeter to pin 6, center meter

8) Adjust L3 and L4 for best demodulation (scope) and 0V at center meter

9) Reinstall FM-Unit into the transceiver

10) Mode “FM”, “RX”

11) Tune in signal 50Mikrovolt 145,000MHz: Set R1 (mainboard nearby the FM-Unit) for

S=9

DL7MAJ, Oct 20th 2015

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DL7MAJ, Oct 20th 2015

Page 10 (21)

T-MIX

1) Alignment requires an sweeper

2) Coarse “145MHz” *)

3) Connect sweeper to the external VFO input: J2 pins 8 (Gnd) and 9

4) Set sweep to 10,000 to 13,000MHz, app. 0dBm (700mVpp) *)

5) Mode “FM”

6) 50Demodulator (10W) and viewer (scope) at Antenna output

7) Sweeper output to zero

8) “TX”

9) Set sweeper output to app. 1W at antenna output

10) Tune L1 to maximum

11) Tune L3 to L9 to maximum and flat response in the range of 10,385 to 12,385MHz *)

12) Reduce sweeper output when 1W at antenna output is exceeded

13) Tune C32, C35, C43 and C44 to maximum and flat response in the range of 10,385 to

12,385MHz

14) Go back to 10 until result is satisfying: Flat response (+/- 3dB in the range of 10,385

to 12,385MHz

*) With “Coarse” 145MHz and sweeper from 10,385 to 13,385MHz the output is 144 to

146MHz

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