Icom IC-718 (IC 718 IC718) user and service manual, modifications

   
 
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07 May 2024, 2:24 UTC 


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Icom IC-718 (IC 718 IC718)
IC-718
Programming interface schematics for Icom:
Programming software for Icom IC-718 (IC 718 IC718) :
PDF User Manual for Icom IC-718 (IC 718 IC718) : Icom IC-718 Instruction Manual
PDF Adjusments Procedures Manual with schematics for Icom IC-718 (IC 718 IC718) :
Schematics for Icom IC-718 (IC 718 IC718) :

Mods for Icom IC-718 (IC 718 IC718) :
    Icom IC-718 (IC 718 IC718) Tune controller mod
    Icom IC-718 (IC 718 IC718) D48 to D55 Role informations
    Icom IC-718 (IC 718 IC718) Balancing the first RX-mixer of the receiver (MAIN UNIT board)
    Icom IC-718 (IC 718 IC718) Decreasing of superfluous amp in second IF-stage, (MAIN UNIT board)
    Icom IC-718 (IC 718 IC718) Better original mike audio MH-36, IC-718 and other
    Icom IC-718 (IC 718 IC718) 200w SSB
    Icom IC-718 (IC 718 IC718) AGC setting
    Icom IC-718 (IC 718 IC718) AGC time delay cure
    Icom IC-718 (IC 718 IC718) Extended TX and RX
    Icom IC-718 (IC 718 IC718) Modify IC-718#04 to IC-718#03
    Icom IC-718 (IC 718 IC718) TX 1.8 - 30 MHz

Icom IC-718 (IC 718 IC718) technical specifications :  Icom IC-718 (IC 718 IC718) technical specifications



Icom IC-718 (IC 718 IC718) AGC time delay cure

The AGC of this rig on SSB seems to be too fast, but on AM it is considerably slower. SSB uses medium speed, while AM uses medium and slow speed together. This problem is easily cured by connecting slow and medium time delays in parallel, when AM time delay is used on SSB. CW and RTTY remain still original fast delay.

Open bottom cover and find R1807 and R1808 on top side of main board near J2602 (DSP AF connector). Connect their ends (connected toward to sw transistors), together with small jumper (arrow) and that's it.

Click to enlarge