Icom IC-575 (IC 575 IC575) transceiver mods reviews software and diagrams

   
 
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31 July 2014, 4:20 UTC 


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Icom IC-575 (IC 575 IC575)
IC-575
Programming interface schematics for Icom:
Programming software for Icom IC-575 (IC 575 IC575) :
PDF User Manual for Icom IC-575 (IC 575 IC575) :
PDF Service Manual with schematics for Icom IC-575 (IC 575 IC575) :

Mods for Icom IC-575 (IC 575 IC575) :
    Icom IC-575 (IC 575 IC575) General Coverage TX Modification
    Icom IC-575 (IC 575 IC575) Pass band Tuning Modification
    Icom IC-575 (IC 575 IC575) Power control modification
    Icom IC-575 (IC 575 IC575) Restoration of pass band tuning
    Icom IC-575 (IC 575 IC575) Splitting into RX- and TX paths
    Icom IC-575 (IC 575 IC575) Modification of cw pass band (BFO)
    Icom IC-575 (IC 575 IC575) Disabling of SBB squelch
    Icom IC-575 (IC 575 IC575) Very fast AGC
    Icom IC-575 (IC 575 IC575) SSB RF Gain
    Icom IC-575 (IC 575 IC575) Tuning speed
    Icom IC-575 (IC 575 IC575) Frequency range & CTCSS tones
    Icom IC-575 (IC 575 IC575) Freq. steps mod

Icom IC-575 (IC 575 IC575) technical specifications :  Icom IC-575 (IC 575 IC575) technical specifications

Icom IC-575 (IC 575 IC575) Frequency range & CTCSS tones

The IC-275 have capability to cover 138 - 174 MHz and the IC-475 has capability to cover 430 - 450 MHz. Because of hardware restrictions they might not be fully up to specifications in all of the band, but an extended range can be interesting for e.g. use with a transverter. It seems that the IC-275 has a parallel wide band preamp, that can be switch via the WBT pin on RF-YGR PCB.

In the European versions the transceivers are wired for 1750 Hz repeater call, and they have no CTCSS capability. The transceivers have a built-in CTCSS encoder, so these functions can be restored.

Both of these version dependent functions can be set by the diode matrix: D20 - D24 in the logic unit. I do not know the exact mapping, but a lot can be derived from studying the different frequency ranges and the diode matrix coding table found on the schematic diagram.


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