Icom IC-201 User Manual
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
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.
Page 1 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
Required Equipment:
Counter, 150MHz
Multimeter, best with analog scale
RF-Generator 145MHz, level adjustable down to 0,05uV
IF-Generator 10,7MHz, FM
2nd RX for 2m or spectrum analyser
Scope, 50MHz with analog output for counter
Dummy load and Power Meter, 145MHz >15W
Resistor 25/20W (2 x 50 parallel)
Sweeper 10 … 15MHz
AF-Generator
Microphone and CW-Key
Optional: Spectrum analyser or Scope >250MHz for optimum of PA linearity
Page 2 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
AF
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
Page 3 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
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”
Page 4 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
Page 5 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
RF
1) Set “RF GAIN” to “H”
2) Weak signal at 145,000MHz just enough to move S-Meter to S=5
3) Tune L1, L6 and L7 for maximum AF or S-meter
4) Unmount RF-Module (one clamp at each end) and turn RF-module upside down
5) Tune L2 to L5 for maximum
6) Mount RF-Module
7) 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!
Page 6 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
Helical Filter
These filters (cores) are very sensitive, use appropriate tool only!
Adjust only if you feel that these filters are mismatched!
1) Weak signal at 145,000MHz just enough to move S-Meter to S=1 or 2
2) Connect sensitive AF-Voltmeter or scope parallel to speaker
3) Adjust both helical filters to maximum AF
4) Repeat at 144,000 and 145,999MHz
5) If you observe differences tune for maximum at 144,500MHz
Page 7 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
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)
Note: Mode has to be “USB” not “FM”!
In FM there is a small difference in RIT adjustment compared with USB/LSB/CW!
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)
Page 8 (27)
DL7MAJ, Oct 20th ,24th , 31st, Nov. 1st , 9th , 21st 2015, March 11th 2016
Up to now, I´ve no procedure for aligning L3 to L14.
Page 9 (27)
Loading...