Icom IC-240 (IC 240 IC240) transceiver mods reviews software and diagrams

   
 
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Icom IC-240 (IC 240 IC240)
IC-240
Programming interface schematics for Icom:
Programming software for Icom IC-240 (IC 240 IC240) :
PDF User Manual for Icom IC-240 (IC 240 IC240) : Icom IC-240 Instruction Manual
Schematics for Icom IC-240 (IC 240 IC240) : Icom IC-240 diagram

Mods for Icom IC-240 (IC 240 IC240) :
    Icom IC-240 (IC 240 IC240) 12,5 Khz mods

Icom IC-240 (IC 240 IC240) technical specifications :  Icom IC-240 (IC 240 IC240) technical specifications



Icom IC-240 (IC 240 IC240) 12,5 Khz mods

Here are mods for putting 12,5 kHz step frequency for this rig. The basic step frequency is normally 25 kHz, and the rig uses a diode matrix board as a "memory" for 22 channels.

The modifications are useful if you have put frequencies for repeater in your chart. After upgrade, you can access to 12,5 kHz bandplan, and the total of channels will be 2x22 = 44.

The modifications are based on 3 features, that is to say:

  • PLL mods for 12,5 kHz step
  • deviation adjustment for narrow FM (+/- 2,5 kHz)
  • improving selectivity in IF amplifiers (455 kHz), receiving part

1) PLL mods for 12,5 kHz step

All mods are done on PLL board located on the bottom of the rig. The first thing to check is the frequency of X-tal X1. It must be 6,4 MHz. You can measure the value of frequency at pin 11 (25 kHz) and pin 12 (12,5 kHz) of IC6 (uPD4013). This part of IC is used as divider by 2, so the reference frequency for the phase comparator IC1 (TC5081P) is 12,5 kHz. How lucky we are! You can adjust perfectly the value of the reference frequency with C2 trimmer capacitor.

The main modification is done by changing the loop divider ratio (half part of IC6 and IC1). Depending of the programming, the total ratio of dividing is between 128 and 288 but always with even ratio_(128, 130, 132...286, 288).
The explanation is given by the fact that the second part of IC6 (uPD4013) used as divider by 2 is in front of programmable divider IC1 (TC5080P) which gives 64 to 128 dividing ratio. In order to access 12,5 kHz step, the total dividing ratio must cover values such as 129, 131, 133...285, 287).

Consequently, we have to replace half part of IC6 (uPD4013) and IC1 (TC5080P) by a new and single programmable divider. For doing this job, the MC145151 has been choosen. With this IC, we just use the programmable divider part. Practical job is done by using a small piggy board supporting the MC145151. An IC socket is soldered instead of IC1 (TC5080P), and the small board is plug on it. This board can be something like bicc veroboard. Do not worry about frequency problems, because the highest value encountered is about 3,6 MHz.

If there is a 10 kohms resistor between pin 1 of IC6 (uPD4013) and pin 15 of IC1 (TC5080P), you have to desolder it. On this pin 15, you have to solder a capacitor of 220 pF to pin 3 of IC6 (uPD4013). Mount this capacitor on the copper side of the PC board. Now the piggy board has to be wired following this chart:

        MC145151 pins           IC1 socket pins         remarks

        (1)                     (15)                    f in
        (2)                     (9)                     ground
        (3)                     (13)                    + 9 V
        (4)                      -                      not used
        (5)                     (9)                     grounded
        (6)                     (9)                     grounded
        (7)                     (9)                     grounded
        (8)                      -                      not used
        (9)                      -                      not used
        (10)                    (10)                    f: out
        (11)                    external wire           N0 (see text below)
        (12)                    (1)                     N1
        (13)                    (2)                     N2
        (14)                    (3)                     N3

        (15)                    (4)                     N4
        (16)                    (5)                     N5
        (17)                    (6)                     N6
        (18)                    (7)                     N7
        (19)                    (8)                     N8
        (20)                    (9)                     grounded
        (21)                     -                      not used
        (22)                    (9)                     grounded
        (23)                    (9)                     grounded
        (24)                    (9)                     grounded
        (25)                    (9)                     grounded
        (26)                     -                      not used
        (27)                    (9)                     grounded
        (28)                     -                      not used

Note that instead of pin 9 for socket IC1, you can use also pins 11 or 12.

N0 is the bit of lowest magnitude. When N0 is at zero logic level, you access to "normal" frequencies (divider ratio is even), with 25 kHz step.
When N0 is at one logic level, you access to "normal + 12,5 kHz" frequencies, (divider ratio is odd). On my rig, I use a simple switch on the front panel of the rig. it is mounted instead the 1750 Hz pushbutton. The 1750 Hz is now remote through a pushbutton mounted inside a microphone (pin 3 of microphone socket is free for this use).

N0 is wired through the mid point of the switch with a pull-up resistor on + 9 V. The other point of the switch is grounded.

After doing this, it requires no more adjustement. However, because of the PLL system, using a mix frequency of 131,7 MHz (three times 43,9 MHz freq. of X-tal X2), it is better to check the exact transmit frequency. Fine adjustment is possible through trimmer capacitor C38.

2) Deviation adjustment for narrow FM (+/- 2,5 kHz)

In order to comply with 12,5 kHz step frequency, it is necessary to adjust the deviation. It could be done with a deviation meter, but this instrument verder, (A)fbreken, (C)verder geen pag. of (N)volgende ber. -->is not easy available. Here is an alternative method which provides good results (checked with a deviation meter). All the adjustments are done on the main board, which is located on the top of the rig.

  • turn the R132 potentiometer (AF gain) for maximum gain,
  • turn on the 1750 Hz and check the audio level at mid point of R112 potentiometer, you could read with an oscilloscope about 3,2 V peak to peak. This value is right for +/- 5 kHz deviation. Now reduce the value to 2 V peak to peak with R132. The resulting deviation is +/- 2,5 kHz (exactly close to +/- 3 kHz depending of audio content).
  • Adjust the R132 potentiomer (AF gain) according to your voice. For the adjustment of R132, you could also use the original setting. But, NEVER adjust the deviation potentiometer R112 once more. This complete the deviation adjustment.
3) Improving IF selectivity (455 kHz) - receiving part

For 12,5 kHz step frequency, the IF bandwidth is sometimes wide. This situation is true when you turn to low signals with a strong nearby signal. The solution is very simple. You have to replace two 455 kHz filters in IF part of the receiver. They are easily available from MURATA distributors. The filters are located on the main board, which is located on the top of the rig.
  • replace the two IF filters CFU455 E (black plastic case) by CFU455 G,
  • for matching correctly these new filters, changing the following resistors by these new values:
        R17 and R18:  820 Ohms (instead of 470 ohms)
        R20: 5,6 Kohms (instead of 3,3 Kohms)
        R14: 470 Ohms  (instead of 1 Kohms)
        R15: 2 Kohms   (instead of 1,5 kohms)
No more adjustment is required. Sensitivity and signal to noise ratio are equivalent to original one. Closing channels are now well rejected.

This complete the mods done with success on my old rig. For information, I have already change the 1750 Hz PC Board by a cristal controlled one. Drift problems belong to the past. If anyone knows upgrade mods for this reliable and rugged rig, I am also interested. Many thanks, and hope reading any of your comments.

PS!!
Please, note that the deviation adjustment is done by decreasing AF voltage from 3,2 to 2 V peak to peak with R112 and not R132 as mentionned.

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    Icom IC-775 (IC 775 IC775) service manual and specs
    Icom IC-775DSP (IC 775 DSP IC775DSP) service manual and specs
    Icom IC-780 (IC 780 IC780) service manual and specs
    Icom IC-781 (IC 781 IC781) service manual and specs
    Icom IC-7000 (IC 7000 IC7000) service manual and specs
    Icom IC-7400 (IC 7400 IC7400) service manual and specs
    Icom IC-7800 (IC 7800 IC7800) service manual and specs
    Icom X3 (X 3) service manual and specs
    Icom IC-7700 (IC 7700 IC7700) service manual and specs
    Icom IC-7100 (IC 7100 IC7100) service manual and specs
    Icom IC-7200 (IC 7200 IC7200) service manual and specs
    Icom IC-7410 (IC 7410 IC7410) service manual and specs
    Icom IC-7600 (IC 7600 IC7600) service manual and specs
    Icom IC-9100 (IC 9100 IC9100) service manual and specs
    Icom IC-78 (IC 78 IC78) service manual and specs

Icom receiver/scanner:
    Icom IC-R1500 (IC R 1500 ICR1500) service manual and specs
    Icom IC-PCR1500 (IC PCR 1500 ICPCR1500) service manual and specs
    Icom IC-R2500 (IC R 2500 ICR2500) service manual and specs
    Icom IC-PCR2500 (IC PCR 2500 ICPCR2500) service manual and specs
    Icom IC-R9500 (IC R 9500 ICR9500) service manual and specs

CB Equipment


President
Midland
Uniden
Zodiac

 Power amplifiers


Beko
Icom
Alinco
Drake
Yaesu
Daiwa
Collins
Kenwood
DanAmps
Ameritron
Autophon
Eto/Alpha
Command Technologies
E.F.Johnson
Dentron Radio Co.

FRS/GMRS


Bell
GPX
ENC
Tekk
Icom
Sony
Alinco
Drake
Cobra
Maxon
Vertex
Conair
Uniden
Jenson
Ranger
Midland
Whistler
Magnum
Unwired
Coleman
Motorola
Audiovox
Memorex
Columbia
Samsung
Standard
Kenwood
Cherokee
Panasonic
Freetalker
Vtech Vtalk
RadioShack
Fanon Courier
Sharper Image
General Electric
Oregon Scientific

PMR446


Sommerkamp
FreeQuency
Goodmans
Kenwood
Lafayette
President
Binatone
Motorola
Multicom
Albrecht
Maycom
Topcom
Xtreme
Ondico
Telcom
Maxon
Vertex
Zodiac
Yaesu
Cobra
Alinco
Icom
Alan
ITT